# viewport.cpp

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    00001 /* $Id: viewport.cpp 18614 2009-12-23 17:59:34Z smatz $ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
    00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
    00008  */
    00009
    00028 #include "stdafx.h"
    00029 #include "openttd.h"
    00030 #include "landscape.h"
    00031 #include "viewport_func.h"
    00032 #include "station_base.h"
    00033 #include "waypoint_base.h"
    00034 #include "town.h"
    00035 #include "signs_base.h"
    00036 #include "signs_func.h"
    00037 #include "variables.h"
    00038 #include "vehicle_base.h"
    00039 #include "vehicle_gui.h"
    00040 #include "blitter/factory.hpp"
    00041 #include "transparency.h"
    00042 #include "strings_func.h"
    00043 #include "zoom_func.h"
    00044 #include "vehicle_func.h"
    00045 #include "company_func.h"
    00046 #include "waypoint_func.h"
    00047 #include "window_func.h"
    00048 #include "tilehighlight_func.h"
    00049 #include "window_gui.h"
    00050
    00051 #include "table/sprites.h"
    00052 #include "table/strings.h"
    00053
    00054 PlaceProc *_place_proc;
    00055 Point _tile_fract_coords;
    00056
    00057 struct StringSpriteToDraw {
    00058   StringID string;
    00059   Colours colour;
    00060   int32 x;
    00061   int32 y;
    00062   uint64 params[2];
    00063   uint16 width;
    00064 };
    00065
    00066 struct TileSpriteToDraw {
    00067   SpriteID image;
    00068   SpriteID pal;
    00069   const SubSprite *sub;
    00070   int32 x;
    00071   int32 y;
    00072 };
    00073
    00074 struct ChildScreenSpriteToDraw {
    00075   SpriteID image;
    00076   SpriteID pal;
    00077   const SubSprite *sub;
    00078   int32 x;
    00079   int32 y;
    00080   int next;
    00081 };
    00082
    00084 struct ParentSpriteToDraw {
    00085   SpriteID image;
    00086   SpriteID pal;
    00087   const SubSprite *sub;
    00088
    00089   int32 x;
    00090   int32 y;
    00091
    00092   int32 left;
    00093   int32 top;
    00094
    00095   int32 xmin;
    00096   int32 xmax;
    00097   int32 ymin;
    00098   int32 ymax;
    00099   int zmin;
    00100   int zmax;
    00101
    00102   int first_child;
    00103   bool comparison_done;
    00104 };
    00105
    00107 enum FoundationPart {
    00108   FOUNDATION_PART_NONE     = 0xFF,
    00109   FOUNDATION_PART_NORMAL   = 0,
    00110   FOUNDATION_PART_HALFTILE = 1,
    00111   FOUNDATION_PART_END
    00112 };
    00113
    00117 enum SpriteCombineMode {
    00118   SPRITE_COMBINE_NONE,
    00119   SPRITE_COMBINE_PENDING,
    00120   SPRITE_COMBINE_ACTIVE,
    00121 };
    00122
    00123 typedef SmallVector<TileSpriteToDraw, 64> TileSpriteToDrawVector;
    00124 typedef SmallVector<StringSpriteToDraw, 4> StringSpriteToDrawVector;
    00125 typedef SmallVector<ParentSpriteToDraw, 64> ParentSpriteToDrawVector;
    00126 typedef SmallVector<ParentSpriteToDraw*, 64> ParentSpriteToSortVector;
    00127 typedef SmallVector<ChildScreenSpriteToDraw, 16> ChildScreenSpriteToDrawVector;
    00128
    00130 struct ViewportDrawer {
    00131   DrawPixelInfo dpi;
    00132
    00133   StringSpriteToDrawVector string_sprites_to_draw;
    00134   TileSpriteToDrawVector tile_sprites_to_draw;
    00135   ParentSpriteToDrawVector parent_sprites_to_draw;
    00136   ParentSpriteToSortVector parent_sprites_to_sort;
    00137   ChildScreenSpriteToDrawVector child_screen_sprites_to_draw;
    00138
    00139   int *last_child;
    00140
    00141   SpriteCombineMode combine_sprites;
    00142
    00143   int foundation[FOUNDATION_PART_END];
    00144   FoundationPart foundation_part;
    00145   int *last_foundation_child[FOUNDATION_PART_END];
    00146   Point foundation_offset[FOUNDATION_PART_END];
    00147 };
    00148
    00149 static ViewportDrawer _vd;
    00150
    00151 TileHighlightData _thd;
    00152 static TileInfo *_cur_ti;
    00153 bool _draw_bounding_boxes = false;
    00154
    00155 static Point MapXYZToViewport(const ViewPort *vp, int x, int y, int z)
    00156 {
    00157   Point p = RemapCoords(x, y, z);
    00158   p.x -= vp->virtual_width / 2;
    00159   p.y -= vp->virtual_height / 2;
    00160   return p;
    00161 }
    00162
    00163 void DeleteWindowViewport(Window *w)
    00164 {
    00165   free(w->viewport);
    00166   w->viewport = NULL;
    00167 }
    00168
    00181 void InitializeWindowViewport(Window *w, int x, int y,
    00182   int width, int height, uint32 follow_flags, ZoomLevel zoom)
    00183 {
    00184   assert(w->viewport == NULL);
    00185
    00186   ViewportData *vp = CallocT<ViewportData>(1);
    00187
    00188   vp->left = x + w->left;
    00189   vp->top = y + w->top;
    00190   vp->width = width;
    00191   vp->height = height;
    00192
    00193   vp->zoom = zoom;
    00194
    00195   vp->virtual_width = ScaleByZoom(width, zoom);
    00196   vp->virtual_height = ScaleByZoom(height, zoom);
    00197
    00198   Point pt;
    00199
    00200   if (follow_flags & 0x80000000) {
    00201     const Vehicle *veh;
    00202
    00203     vp->follow_vehicle = (VehicleID)(follow_flags & 0xFFFF);
    00204     veh = Vehicle::Get(vp->follow_vehicle);
    00205     pt = MapXYZToViewport(vp, veh->x_pos, veh->y_pos, veh->z_pos);
    00206   } else {
    00207     uint x = TileX(follow_flags) * TILE_SIZE;
    00208     uint y = TileY(follow_flags) * TILE_SIZE;
    00209
    00210     vp->follow_vehicle = INVALID_VEHICLE;
    00211     pt = MapXYZToViewport(vp, x, y, GetSlopeZ(x, y));
    00212   }
    00213
    00214   vp->scrollpos_x = pt.x;
    00215   vp->scrollpos_y = pt.y;
    00216   vp->dest_scrollpos_x = pt.x;
    00217   vp->dest_scrollpos_y = pt.y;
    00218
    00219   w->viewport = vp;
    00220   vp->virtual_left = 0;//pt.x;
    00221   vp->virtual_top = 0;//pt.y;
    00222 }
    00223
    00224 static Point _vp_move_offs;
    00225
    00226 static void DoSetViewportPosition(const Window *w, int left, int top, int width, int height)
    00227 {
    00228   FOR_ALL_WINDOWS_FROM_BACK_FROM(w, w) {
    00229     if (left + width > w->left &&
    00230         w->left + w->width > left &&
    00231         top + height > w->top &&
    00232         w->top + w->height > top) {
    00233
    00234       if (left < w->left) {
    00235         DoSetViewportPosition(w, left, top, w->left - left, height);
    00236         DoSetViewportPosition(w, left + (w->left - left), top, width - (w->left - left), height);
    00237         return;
    00238       }
    00239
    00240       if (left + width > w->left + w->width) {
    00241         DoSetViewportPosition(w, left, top, (w->left + w->width - left), height);
    00242         DoSetViewportPosition(w, left + (w->left + w->width - left), top, width - (w->left + w->width - left), height);
    00243         return;
    00244       }
    00245
    00246       if (top < w->top) {
    00247         DoSetViewportPosition(w, left, top, width, (w->top - top));
    00248         DoSetViewportPosition(w, left, top + (w->top - top), width, height - (w->top - top));
    00249         return;
    00250       }
    00251
    00252       if (top + height > w->top + w->height) {
    00253         DoSetViewportPosition(w, left, top, width, (w->top + w->height - top));
    00254         DoSetViewportPosition(w, left, top + (w->top + w->height - top), width, height - (w->top + w->height - top));
    00255         return;
    00256       }
    00257
    00258       return;
    00259     }
    00260   }
    00261
    00262   {
    00263     int xo = _vp_move_offs.x;
    00264     int yo = _vp_move_offs.y;
    00265
    00266     if (abs(xo) >= width || abs(yo) >= height) {
    00267       /* fully_outside */
    00268       RedrawScreenRect(left, top, left + width, top + height);
    00269       return;
    00270     }
    00271
    00272     GfxScroll(left, top, width, height, xo, yo);
    00273
    00274     if (xo > 0) {
    00275       RedrawScreenRect(left, top, xo + left, top + height);
    00276       left += xo;
    00277       width -= xo;
    00278     } else if (xo < 0) {
    00279       RedrawScreenRect(left + width + xo, top, left + width, top + height);
    00280       width += xo;
    00281     }
    00282
    00283     if (yo > 0) {
    00284       RedrawScreenRect(left, top, width + left, top + yo);
    00285     } else if (yo < 0) {
    00286       RedrawScreenRect(left, top + height + yo, width + left, top + height);
    00287     }
    00288   }
    00289 }
    00290
    00291 static void SetViewportPosition(Window *w, int x, int y)
    00292 {
    00293   ViewPort *vp = w->viewport;
    00294   int old_left = vp->virtual_left;
    00295   int old_top = vp->virtual_top;
    00296   int i;
    00297   int left, top, width, height;
    00298
    00299   vp->virtual_left = x;
    00300   vp->virtual_top = y;
    00301
    00302   /* viewport is bound to its left top corner, so it must be rounded down (UnScaleByZoomLower)
    00303    * else glitch described in FS#1412 will happen (offset by 1 pixel with zoom level > NORMAL)
    00304    */
    00305   old_left = UnScaleByZoomLower(old_left, vp->zoom);
    00306   old_top = UnScaleByZoomLower(old_top, vp->zoom);
    00307   x = UnScaleByZoomLower(x, vp->zoom);
    00308   y = UnScaleByZoomLower(y, vp->zoom);
    00309
    00310   old_left -= x;
    00311   old_top -= y;
    00312
    00313   if (old_top == 0 && old_left == 0) return;
    00314
    00315   _vp_move_offs.x = old_left;
    00316   _vp_move_offs.y = old_top;
    00317
    00318   left = vp->left;
    00319   top = vp->top;
    00320   width = vp->width;
    00321   height = vp->height;
    00322
    00323   if (left < 0) {
    00324     width += left;
    00325     left = 0;
    00326   }
    00327
    00328   i = left + width - _screen.width;
    00329   if (i >= 0) width -= i;
    00330
    00331   if (width > 0) {
    00332     if (top < 0) {
    00333       height += top;
    00334       top = 0;
    00335     }
    00336
    00337     i = top + height - _screen.height;
    00338     if (i >= 0) height -= i;
    00339
    00340     if (height > 0) DoSetViewportPosition(w->z_front, left, top, width, height);
    00341   }
    00342 }
    00343
    00352 ViewPort *IsPtInWindowViewport(const Window *w, int x, int y)
    00353 {
    00354   ViewPort *vp = w->viewport;
    00355
    00356   if (vp != NULL &&
    00357       IsInsideMM(x, vp->left, vp->left + vp->width) &&
    00358       IsInsideMM(y, vp->top, vp->top + vp->height))
    00359     return vp;
    00360
    00361   return NULL;
    00362 }
    00363
    00370 static Point TranslateXYToTileCoord(const ViewPort *vp, int x, int y)
    00371 {
    00372   Point pt;
    00373   int a, b;
    00374   uint z;
    00375
    00376   if ( (uint)(x -= vp->left) >= (uint)vp->width ||
    00377         (uint)(y -= vp->top) >= (uint)vp->height) {
    00378         Point pt = {-1, -1};
    00379         return pt;
    00380   }
    00381
    00382   x = (ScaleByZoom(x, vp->zoom) + vp->virtual_left) >> 2;
    00383   y = (ScaleByZoom(y, vp->zoom) + vp->virtual_top) >> 1;
    00384
    00385   a = y - x;
    00386   b = y + x;
    00387
    00388   /* we need to move variables in to the valid range, as the
    00389    * GetTileZoomCenterWindow() function can call here with invalid x and/or y,
    00390    * when the user tries to zoom out along the sides of the map */
    00391   a = Clamp(a, -4 * TILE_SIZE, (int)(MapMaxX() * TILE_SIZE) - 1);
    00392   b = Clamp(b, -4 * TILE_SIZE, (int)(MapMaxY() * TILE_SIZE) - 1);
    00393
    00394   /* (a, b) is the X/Y-world coordinate that belongs to (x,y) if the landscape would be completely flat on height 0.
    00395    * Now find the Z-world coordinate by fix point iteration.
    00396    * This is a bit tricky because the tile height is non-continuous at foundations.
    00397    * The clicked point should be approached from the back, otherwise there are regions that are not clickable.
    00398    * (FOUNDATION_HALFTILE_LOWER on SLOPE_STEEP_S hides north halftile completely)
    00399    * So give it a z-malus of 4 in the first iterations.
    00400    */
    00401   z = 0;
    00402
    00403   int min_coord = _settings_game.construction.freeform_edges ? TILE_SIZE : 0;
    00404
    00405   for (int i = 0; i < 5; i++) z = GetSlopeZ(Clamp(a + (int)max(z, 4u) - 4, min_coord, MapMaxX() * TILE_SIZE - 1), Clamp(b + (int)max(z, 4u) - 4, min_coord, MapMaxY() * TILE_SIZE - 1)) / 2;
    00406   for (uint malus = 3; malus > 0; malus--) z = GetSlopeZ(Clamp(a + (int)max(z, malus) - (int)malus, min_coord, MapMaxX() * TILE_SIZE - 1), Clamp(b + (int)max(z, malus) - (int)malus, min_coord, MapMaxY() * TILE_SIZE - 1)) / 2;
    00407   for (int i = 0; i < 5; i++) z = GetSlopeZ(Clamp(a + (int)z, min_coord, MapMaxX() * TILE_SIZE - 1), Clamp(b + (int)z, min_coord, MapMaxY() * TILE_SIZE - 1)) / 2;
    00408
    00409   pt.x = Clamp(a + (int)z, min_coord, MapMaxX() * TILE_SIZE - 1);
    00410   pt.y = Clamp(b + (int)z, min_coord, MapMaxY() * TILE_SIZE - 1);
    00411
    00412   return pt;
    00413 }
    00414
    00415 /* When used for zooming, check area below current coordinates (x,y)
    00416  * and return the tile of the zoomed out/in position (zoom_x, zoom_y)
    00417  * when you just want the tile, make x = zoom_x and y = zoom_y */
    00418 static Point GetTileFromScreenXY(int x, int y, int zoom_x, int zoom_y)
    00419 {
    00420   Window *w;
    00421   ViewPort *vp;
    00422   Point pt;
    00423
    00424   if ( (w = FindWindowFromPt(x, y)) != NULL &&
    00425        (vp = IsPtInWindowViewport(w, x, y)) != NULL)
    00426         return TranslateXYToTileCoord(vp, zoom_x, zoom_y);
    00427
    00428   pt.y = pt.x = -1;
    00429   return pt;
    00430 }
    00431
    00432 Point GetTileBelowCursor()
    00433 {
    00434   return GetTileFromScreenXY(_cursor.pos.x, _cursor.pos.y, _cursor.pos.x, _cursor.pos.y);
    00435 }
    00436
    00437
    00438 Point GetTileZoomCenterWindow(bool in, Window * w)
    00439 {
    00440   int x, y;
    00441   ViewPort *vp = w->viewport;
    00442
    00443   if (in) {
    00444     x = ((_cursor.pos.x - vp->left) >> 1) + (vp->width >> 2);
    00445     y = ((_cursor.pos.y - vp->top) >> 1) + (vp->height >> 2);
    00446   } else {
    00447     x = vp->width - (_cursor.pos.x - vp->left);
    00448     y = vp->height - (_cursor.pos.y - vp->top);
    00449   }
    00450   /* Get the tile below the cursor and center on the zoomed-out center */
    00451   return GetTileFromScreenXY(_cursor.pos.x, _cursor.pos.y, x + vp->left, y + vp->top);
    00452 }
    00453
    00460 void HandleZoomMessage(Window *w, const ViewPort *vp, byte widget_zoom_in, byte widget_zoom_out)
    00461 {
    00462   w->SetWidgetDisabledState(widget_zoom_in, vp->zoom == ZOOM_LVL_MIN);
    00463   w->SetWidgetDirty(widget_zoom_in);
    00464
    00465   w->SetWidgetDisabledState(widget_zoom_out, vp->zoom == ZOOM_LVL_MAX);
    00466   w->SetWidgetDirty(widget_zoom_out);
    00467 }
    00468
    00482 void DrawGroundSpriteAt(SpriteID image, SpriteID pal, int32 x, int32 y, byte z, const SubSprite *sub, int extra_offs_x, int extra_offs_y)
    00483 {
    00484   assert((image & SPRITE_MASK) < MAX_SPRITES);
    00485
    00486   TileSpriteToDraw *ts = _vd.tile_sprites_to_draw.Append();
    00487   ts->image = image;
    00488   ts->pal = pal;
    00489   ts->sub = sub;
    00490   Point pt = RemapCoords(x, y, z);
    00491   ts->x = pt.x + extra_offs_x;
    00492   ts->y = pt.y + extra_offs_y;
    00493 }
    00494
    00507 static void AddChildSpriteToFoundation(SpriteID image, SpriteID pal, const SubSprite *sub, FoundationPart foundation_part, int extra_offs_x, int extra_offs_y)
    00508 {
    00509   assert(IsInsideMM(foundation_part, 0, FOUNDATION_PART_END));
    00510   assert(_vd.foundation[foundation_part] != -1);
    00511   Point offs = _vd.foundation_offset[foundation_part];
    00512
    00513   /* Change the active ChildSprite list to the one of the foundation */
    00514   int *old_child = _vd.last_child;
    00515   _vd.last_child = _vd.last_foundation_child[foundation_part];
    00516
    00517   AddChildSpriteScreen(image, pal, offs.x + extra_offs_x, offs.y + extra_offs_y, false, sub);
    00518
    00519   /* Switch back to last ChildSprite list */
    00520   _vd.last_child = old_child;
    00521 }
    00522
    00533 void DrawGroundSprite(SpriteID image, SpriteID pal, const SubSprite *sub, int extra_offs_x, int extra_offs_y)
    00534 {
    00535   /* Switch to first foundation part, if no foundation was drawn */
    00536   if (_vd.foundation_part == FOUNDATION_PART_NONE) _vd.foundation_part = FOUNDATION_PART_NORMAL;
    00537
    00538   if (_vd.foundation[_vd.foundation_part] != -1) {
    00539     AddChildSpriteToFoundation(image, pal, sub, _vd.foundation_part, extra_offs_x, extra_offs_y);
    00540   } else {
    00541     DrawGroundSpriteAt(image, pal, _cur_ti->x, _cur_ti->y, _cur_ti->z, sub, extra_offs_x, extra_offs_y);
    00542   }
    00543 }
    00544
    00545
    00553 void OffsetGroundSprite(int x, int y)
    00554 {
    00555   /* Switch to next foundation part */
    00556   switch (_vd.foundation_part) {
    00557     case FOUNDATION_PART_NONE:
    00558       _vd.foundation_part = FOUNDATION_PART_NORMAL;
    00559       break;
    00560     case FOUNDATION_PART_NORMAL:
    00561       _vd.foundation_part = FOUNDATION_PART_HALFTILE;
    00562       break;
    00563     default: NOT_REACHED();
    00564   }
    00565
    00566   /* _vd.last_child == NULL if foundation sprite was clipped by the viewport bounds */
    00567   if (_vd.last_child != NULL) _vd.foundation[_vd.foundation_part] = _vd.parent_sprites_to_draw.Length() - 1;
    00568
    00569   _vd.foundation_offset[_vd.foundation_part].x = x;
    00570   _vd.foundation_offset[_vd.foundation_part].y = y;
    00571   _vd.last_foundation_child[_vd.foundation_part] = _vd.last_child;
    00572 }
    00573
    00585 static void AddCombinedSprite(SpriteID image, SpriteID pal, int x, int y, byte z, const SubSprite *sub)
    00586 {
    00587   Point pt = RemapCoords(x, y, z);
    00588   const Sprite *spr = GetSprite(image & SPRITE_MASK, ST_NORMAL);
    00589
    00590   if (pt.x + spr->x_offs >= _vd.dpi.left + _vd.dpi.width ||
    00591       pt.x + spr->x_offs + spr->width <= _vd.dpi.left ||
    00592       pt.y + spr->y_offs >= _vd.dpi.top + _vd.dpi.height ||
    00593       pt.y + spr->y_offs + spr->height <= _vd.dpi.top)
    00594     return;
    00595
    00596   const ParentSpriteToDraw *pstd = _vd.parent_sprites_to_draw.End() - 1;
    00597   AddChildSpriteScreen(image, pal, pt.x - pstd->left, pt.y - pstd->top, false, sub);
    00598 }
    00599
    00624 void AddSortableSpriteToDraw(SpriteID image, SpriteID pal, int x, int y, int w, int h, int dz, int z, bool transparent, int bb_offset_x, int bb_offset_y, int bb_offset_z, const SubSprite *sub)
    00625 {
    00626   int32 left, right, top, bottom;
    00627
    00628   assert((image & SPRITE_MASK) < MAX_SPRITES);
    00629
    00630   /* make the sprites transparent with the right palette */
    00631   if (transparent) {
    00632     SetBit(image, PALETTE_MODIFIER_TRANSPARENT);
    00633     pal = PALETTE_TO_TRANSPARENT;
    00634   }
    00635
    00636   if (_vd.combine_sprites == SPRITE_COMBINE_ACTIVE) {
    00637     AddCombinedSprite(image, pal, x, y, z, sub);
    00638     return;
    00639   }
    00640
    00641   _vd.last_child = NULL;
    00642
    00643   Point pt = RemapCoords(x, y, z);
    00644   int tmp_left, tmp_top, tmp_x = pt.x, tmp_y = pt.y;
    00645
    00646   /* Compute screen extents of sprite */
    00647   if (image == SPR_EMPTY_BOUNDING_BOX) {
    00648     left = tmp_left = RemapCoords(x + w          , y + bb_offset_y, z + bb_offset_z).x;
    00649     right           = RemapCoords(x + bb_offset_x, y + h          , z + bb_offset_z).x + 1;
    00650     top  = tmp_top  = RemapCoords(x + bb_offset_x, y + bb_offset_y, z + dz         ).y;
    00651     bottom          = RemapCoords(x + w          , y + h          , z + bb_offset_z).y + 1;
    00652   } else {
    00653     const Sprite *spr = GetSprite(image & SPRITE_MASK, ST_NORMAL);
    00654     left = tmp_left = (pt.x += spr->x_offs);
    00655     right           = (pt.x +  spr->width );
    00656     top  = tmp_top  = (pt.y += spr->y_offs);
    00657     bottom          = (pt.y +  spr->height);
    00658   }
    00659
    00660   if (_draw_bounding_boxes && (image != SPR_EMPTY_BOUNDING_BOX)) {
    00661     /* Compute maximal extents of sprite and it's bounding box */
    00662     left   = min(left  , RemapCoords(x + w          , y + bb_offset_y, z + bb_offset_z).x);
    00663     right  = max(right , RemapCoords(x + bb_offset_x, y + h          , z + bb_offset_z).x + 1);
    00664     top    = min(top   , RemapCoords(x + bb_offset_x, y + bb_offset_y, z + dz         ).y);
    00665     bottom = max(bottom, RemapCoords(x + w          , y + h          , z + bb_offset_z).y + 1);
    00666   }
    00667
    00668   /* Do not add the sprite to the viewport, if it is outside */
    00669   if (left   >= _vd.dpi.left + _vd.dpi.width ||
    00670       right  <= _vd.dpi.left                 ||
    00671       top    >= _vd.dpi.top + _vd.dpi.height ||
    00672       bottom <= _vd.dpi.top) {
    00673     return;
    00674   }
    00675
    00676   ParentSpriteToDraw *ps = _vd.parent_sprites_to_draw.Append();
    00677   ps->x = tmp_x;
    00678   ps->y = tmp_y;
    00679
    00680   ps->left = tmp_left;
    00681   ps->top  = tmp_top;
    00682
    00683   ps->image = image;
    00684   ps->pal = pal;
    00685   ps->sub = sub;
    00686   ps->xmin = x + bb_offset_x;
    00687   ps->xmax = x + max(bb_offset_x, w) - 1;
    00688
    00689   ps->ymin = y + bb_offset_y;
    00690   ps->ymax = y + max(bb_offset_y, h) - 1;
    00691
    00692   ps->zmin = z + bb_offset_z;
    00693   ps->zmax = z + max(bb_offset_z, dz) - 1;
    00694
    00695   ps->comparison_done = false;
    00696   ps->first_child = -1;
    00697
    00698   _vd.last_child = &ps->first_child;
    00699
    00700   if (_vd.combine_sprites == SPRITE_COMBINE_PENDING) _vd.combine_sprites = SPRITE_COMBINE_ACTIVE;
    00701 }
    00702
    00721 void StartSpriteCombine()
    00722 {
    00723   assert(_vd.combine_sprites == SPRITE_COMBINE_NONE);
    00724   _vd.combine_sprites = SPRITE_COMBINE_PENDING;
    00725 }
    00726
    00731 void EndSpriteCombine()
    00732 {
    00733   assert(_vd.combine_sprites != SPRITE_COMBINE_NONE);
    00734   _vd.combine_sprites = SPRITE_COMBINE_NONE;
    00735 }
    00736
    00747 void AddChildSpriteScreen(SpriteID image, SpriteID pal, int x, int y, bool transparent, const SubSprite *sub)
    00748 {
    00749   assert((image & SPRITE_MASK) < MAX_SPRITES);
    00750
    00751   /* If the ParentSprite was clipped by the viewport bounds, do not draw the ChildSprites either */
    00752   if (_vd.last_child == NULL) return;
    00753
    00754   /* make the sprites transparent with the right palette */
    00755   if (transparent) {
    00756     SetBit(image, PALETTE_MODIFIER_TRANSPARENT);
    00757     pal = PALETTE_TO_TRANSPARENT;
    00758   }
    00759
    00760   *_vd.last_child = _vd.child_screen_sprites_to_draw.Length();
    00761
    00762   ChildScreenSpriteToDraw *cs = _vd.child_screen_sprites_to_draw.Append();
    00763   cs->image = image;
    00764   cs->pal = pal;
    00765   cs->sub = sub;
    00766   cs->x = x;
    00767   cs->y = y;
    00768   cs->next = -1;
    00769
    00770   /* Append the sprite to the active ChildSprite list.
    00771    * If the active ParentSprite is a foundation, update last_foundation_child as well.
    00772    * Note: ChildSprites of foundations are NOT sequential in the vector, as selection sprites are added at last. */
    00773   if (_vd.last_foundation_child[0] == _vd.last_child) _vd.last_foundation_child[0] = &cs->next;
    00774   if (_vd.last_foundation_child[1] == _vd.last_child) _vd.last_foundation_child[1] = &cs->next;
    00775   _vd.last_child = &cs->next;
    00776 }
    00777
    00778 static void AddStringToDraw(int x, int y, StringID string, uint64 params_1, uint64 params_2, Colours colour, uint16 width)
    00779 {
    00780   assert(width != 0);
    00781   StringSpriteToDraw *ss = _vd.string_sprites_to_draw.Append();
    00782   ss->string = string;
    00783   ss->x = x;
    00784   ss->y = y;
    00785   ss->params[0] = params_1;
    00786   ss->params[1] = params_2;
    00787   ss->width = width;
    00788   ss->colour = colour;
    00789 }
    00790
    00791
    00803 static void DrawSelectionSprite(SpriteID image, SpriteID pal, const TileInfo *ti, int z_offset, FoundationPart foundation_part)
    00804 {
    00805   /* FIXME: This is not totally valid for some autorail highlights, that extent over the edges of the tile. */
    00806   if (_vd.foundation[foundation_part] == -1) {
    00807     /* draw on real ground */
    00808     DrawGroundSpriteAt(image, pal, ti->x, ti->y, ti->z + z_offset);
    00809   } else {
    00810     /* draw on top of foundation */
    00811     AddChildSpriteToFoundation(image, pal, NULL, foundation_part, 0, -z_offset);
    00812   }
    00813 }
    00814
    00821 static void DrawTileSelectionRect(const TileInfo *ti, SpriteID pal)
    00822 {
    00823   if (!IsValidTile(ti->tile)) return;
    00824
    00825   SpriteID sel;
    00826   if (IsHalftileSlope(ti->tileh)) {
    00827     Corner halftile_corner = GetHalftileSlopeCorner(ti->tileh);
    00828     SpriteID sel2 = SPR_HALFTILE_SELECTION_FLAT + halftile_corner;
    00829     DrawSelectionSprite(sel2, pal, ti, 7 + TILE_HEIGHT, FOUNDATION_PART_HALFTILE);
    00830
    00831     Corner opposite_corner = OppositeCorner(halftile_corner);
    00832     if (IsSteepSlope(ti->tileh)) {
    00833       sel = SPR_HALFTILE_SELECTION_DOWN;
    00834     } else {
    00835       sel = ((ti->tileh & SlopeWithOneCornerRaised(opposite_corner)) != 0 ? SPR_HALFTILE_SELECTION_UP : SPR_HALFTILE_SELECTION_FLAT);
    00836     }
    00837     sel += opposite_corner;
    00838   } else {
    00839     sel = SPR_SELECT_TILE + _tileh_to_sprite[ti->tileh];
    00840   }
    00841   DrawSelectionSprite(sel, pal, ti, 7, FOUNDATION_PART_NORMAL);
    00842 }
    00843
    00844 static bool IsPartOfAutoLine(int px, int py)
    00845 {
    00846   px -= _thd.selstart.x;
    00847   py -= _thd.selstart.y;
    00848
    00849   if ((_thd.drawstyle & ~HT_DIR_MASK) != HT_LINE) return false;
    00850
    00851   switch (_thd.drawstyle & HT_DIR_MASK) {
    00852     case HT_DIR_X:  return py == 0; // x direction
    00853     case HT_DIR_Y:  return px == 0; // y direction
    00854     case HT_DIR_HU: return px == -py || px == -py - 16; // horizontal upper
    00855     case HT_DIR_HL: return px == -py || px == -py + 16; // horizontal lower
    00856     case HT_DIR_VL: return px == py || px == py + 16; // vertival left
    00857     case HT_DIR_VR: return px == py || px == py - 16; // vertical right
    00858     default:
    00859       NOT_REACHED();
    00860   }
    00861 }
    00862
    00863 /* [direction][side] */
    00864 static const HighLightStyle _autorail_type[6][2] = {
    00865   { HT_DIR_X,  HT_DIR_X },
    00866   { HT_DIR_Y,  HT_DIR_Y },
    00867   { HT_DIR_HU, HT_DIR_HL },
    00868   { HT_DIR_HL, HT_DIR_HU },
    00869   { HT_DIR_VL, HT_DIR_VR },
    00870   { HT_DIR_VR, HT_DIR_VL }
    00871 };
    00872
    00873 #include "table/autorail.h"
    00874
    00881 static void DrawAutorailSelection(const TileInfo *ti, uint autorail_type)
    00882 {
    00883   SpriteID image;
    00884   SpriteID pal;
    00885   int offset;
    00886
    00887   FoundationPart foundation_part = FOUNDATION_PART_NORMAL;
    00888   Slope autorail_tileh = RemoveHalftileSlope(ti->tileh);
    00889   if (IsHalftileSlope(ti->tileh)) {
    00890     static const uint _lower_rail[4] = { 5U, 2U, 4U, 3U };
    00891     Corner halftile_corner = GetHalftileSlopeCorner(ti->tileh);
    00892     if (autorail_type != _lower_rail[halftile_corner]) {
    00893       foundation_part = FOUNDATION_PART_HALFTILE;
    00894       /* Here we draw the highlights of the "three-corners-raised"-slope. That looks ok to me. */
    00895       autorail_tileh = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    00896     }
    00897   }
    00898
    00899   offset = _AutorailTilehSprite[autorail_tileh][autorail_type];
    00900   if (offset >= 0) {
    00901     image = SPR_AUTORAIL_BASE + offset;
    00902     pal = PAL_NONE;
    00903   } else {
    00904     image = SPR_AUTORAIL_BASE - offset;
    00905     pal = PALETTE_SEL_TILE_RED;
    00906   }
    00907
    00908   DrawSelectionSprite(image, _thd.make_square_red ? PALETTE_SEL_TILE_RED : pal, ti, 7, foundation_part);
    00909 }
    00910
    00915 static void DrawTileSelection(const TileInfo *ti)
    00916 {
    00917   /* Draw a red error square? */
    00918   bool is_redsq = _thd.redsq == ti->tile;
    00919   if (is_redsq) DrawTileSelectionRect(ti, PALETTE_TILE_RED_PULSATING);
    00920
    00921   /* no selection active? */
    00922   if (_thd.drawstyle == 0) return;
    00923
    00924   /* Inside the inner area? */
    00925   if (IsInsideBS(ti->x, _thd.pos.x, _thd.size.x) &&
    00926       IsInsideBS(ti->y, _thd.pos.y, _thd.size.y)) {
    00927     if (_thd.drawstyle & HT_RECT) {
    00928       if (!is_redsq) DrawTileSelectionRect(ti, _thd.make_square_red ? PALETTE_SEL_TILE_RED : PAL_NONE);
    00929     } else if (_thd.drawstyle & HT_POINT) {
    00930       /* Figure out the Z coordinate for the single dot. */
    00931       byte z = 0;
    00932       FoundationPart foundation_part = FOUNDATION_PART_NORMAL;
    00933       if (ti->tileh & SLOPE_N) {
    00934         z += TILE_HEIGHT;
    00935         if (RemoveHalftileSlope(ti->tileh) == SLOPE_STEEP_N) z += TILE_HEIGHT;
    00936       }
    00937       if (IsHalftileSlope(ti->tileh)) {
    00938         Corner halftile_corner = GetHalftileSlopeCorner(ti->tileh);
    00939         if ((halftile_corner == CORNER_W) || (halftile_corner == CORNER_E)) z += TILE_HEIGHT;
    00940         if (halftile_corner != CORNER_S) {
    00941           foundation_part = FOUNDATION_PART_HALFTILE;
    00942           if (IsSteepSlope(ti->tileh)) z -= TILE_HEIGHT;
    00943         }
    00944       }
    00945       DrawSelectionSprite(_cur_dpi->zoom <= ZOOM_LVL_DETAIL ? SPR_DOT : SPR_DOT_SMALL, PAL_NONE, ti, z, foundation_part);
    00946     } else if (_thd.drawstyle & HT_RAIL) {
    00947       /* autorail highlight piece under cursor */
    00948       HighLightStyle type = _thd.drawstyle & HT_DIR_MASK;
    00949       assert(type < HT_DIR_END);
    00950       DrawAutorailSelection(ti, _autorail_type[type][0]);
    00951     } else if (IsPartOfAutoLine(ti->x, ti->y)) {
    00952       /* autorail highlighting long line */
    00953       HighLightStyle dir = _thd.drawstyle & HT_DIR_MASK;
    00954       uint side;
    00955
    00956       if (dir == HT_DIR_X || dir == HT_DIR_Y) {
    00957         side = 0;
    00958       } else {
    00959         TileIndex start = TileVirtXY(_thd.selstart.x, _thd.selstart.y);
    00960         side = Delta(Delta(TileX(start), TileX(ti->tile)), Delta(TileY(start), TileY(ti->tile)));
    00961       }
    00962
    00963       DrawAutorailSelection(ti, _autorail_type[dir][side]);
    00964     }
    00965     return;
    00966   }
    00967
    00968   /* Check if it's inside the outer area? */
    00969   if (!is_redsq && _thd.outersize.x &&
    00970       _thd.size.x < _thd.size.x + _thd.outersize.x &&
    00971       IsInsideBS(ti->x, _thd.pos.x + _thd.offs.x, _thd.size.x + _thd.outersize.x) &&
    00972       IsInsideBS(ti->y, _thd.pos.y + _thd.offs.y, _thd.size.y + _thd.outersize.y)) {
    00973     /* Draw a blue rect. */
    00974     DrawTileSelectionRect(ti, PALETTE_SEL_TILE_BLUE);
    00975     return;
    00976   }
    00977 }
    00978
    00979 static void ViewportAddLandscape()
    00980 {
    00981   int x, y, width, height;
    00982   TileInfo ti;
    00983   bool direction;
    00984
    00985   _cur_ti = &ti;
    00986
    00987   /* Transform into tile coordinates and round to closest full tile */
    00988   x = ((_vd.dpi.top >> 1) - (_vd.dpi.left >> 2)) & ~TILE_UNIT_MASK;
    00989   y = ((_vd.dpi.top >> 1) + (_vd.dpi.left >> 2) - TILE_SIZE) & ~TILE_UNIT_MASK;
    00990
    00991   /* determine size of area */
    00992   {
    00993     Point pt = RemapCoords(x, y, 241);
    00994     width = (_vd.dpi.left + _vd.dpi.width - pt.x + 95) >> 6;
    00995     height = (_vd.dpi.top + _vd.dpi.height - pt.y) >> 5 << 1;
    00996   }
    00997
    00998   assert(width > 0);
    00999   assert(height > 0);
    01000
    01001   direction = false;
    01002
    01003   do {
    01004     int width_cur = width;
    01005     int x_cur = x;
    01006     int y_cur = y;
    01007
    01008     do {
    01009       TileType tt = MP_VOID;
    01010
    01011       ti.x = x_cur;
    01012       ti.y = y_cur;
    01013
    01014       ti.z = 0;
    01015
    01016       ti.tileh = SLOPE_FLAT;
    01017       ti.tile = INVALID_TILE;
    01018
    01019       if (0 <= x_cur && x_cur < (int)MapMaxX() * TILE_SIZE &&
    01020           0 <= y_cur && y_cur < (int)MapMaxY() * TILE_SIZE) {
    01021         TileIndex tile = TileVirtXY(x_cur, y_cur);
    01022
    01023         if (!_settings_game.construction.freeform_edges || (TileX(tile) != 0 && TileY(tile) != 0)) {
    01024           if (x_cur == ((int)MapMaxX() - 1) * TILE_SIZE || y_cur == ((int)MapMaxY() - 1) * TILE_SIZE) {
    01025             uint maxh = max<uint>(TileHeight(tile), 1);
    01026             for (uint h = 0; h < maxh; h++) {
    01027               DrawGroundSpriteAt(SPR_SHADOW_CELL, PAL_NONE, ti.x, ti.y, h * TILE_HEIGHT);
    01028             }
    01029           }
    01030
    01031           ti.tile = tile;
    01032           ti.tileh = GetTileSlope(tile, &ti.z);
    01033           tt = GetTileType(tile);
    01034         }
    01035       }
    01036
    01037       _vd.foundation_part = FOUNDATION_PART_NONE;
    01038       _vd.foundation[0] = -1;
    01039       _vd.foundation[1] = -1;
    01040       _vd.last_foundation_child[0] = NULL;
    01041       _vd.last_foundation_child[1] = NULL;
    01042
    01043       _tile_type_procs[tt]->draw_tile_proc(&ti);
    01044
    01045       if ((x_cur == (int)MapMaxX() * TILE_SIZE && IsInsideMM(y_cur, 0, MapMaxY() * TILE_SIZE + 1)) ||
    01046         (y_cur == (int)MapMaxY() * TILE_SIZE && IsInsideMM(x_cur, 0, MapMaxX() * TILE_SIZE + 1))) {
    01047         TileIndex tile = TileVirtXY(x_cur, y_cur);
    01048         ti.tile = tile;
    01049         ti.tileh = GetTileSlope(tile, &ti.z);
    01050         tt = GetTileType(tile);
    01051       }
    01052       if (ti.tile != INVALID_TILE) DrawTileSelection(&ti);
    01053
    01054       y_cur += 0x10;
    01055       x_cur -= 0x10;
    01056     } while (--width_cur);
    01057
    01058     if ((direction ^= 1) != 0) {
    01059       y += 0x10;
    01060     } else {
    01061       x += 0x10;
    01062     }
    01063   } while (--height);
    01064 }
    01065
    01076 void ViewportAddString(const DrawPixelInfo *dpi, ZoomLevel small_from, const ViewportSign *sign, StringID string_normal, StringID string_small, StringID string_small_shadow, uint64 params_1, uint64 params_2, Colours colour)
    01077 {
    01078   bool small = dpi->zoom >= small_from;
    01079
    01080   int left   = dpi->left;
    01081   int top    = dpi->top;
    01082   int right  = left + dpi->width;
    01083   int bottom = top + dpi->height;
    01084
    01085   int sign_height     = ScaleByZoom(VPSM_TOP + FONT_HEIGHT_NORMAL + VPSM_BOTTOM, dpi->zoom);
    01086   int sign_half_width = ScaleByZoom((small ? sign->width_small : sign->width_normal) / 2, dpi->zoom);
    01087
    01088   if (bottom < sign->top ||
    01089       top   > sign->top + sign_height ||
    01090       right < sign->center - sign_half_width ||
    01091       left  > sign->center + sign_half_width) {
    01092     return;
    01093   }
    01094
    01095   if (!small) {
    01096     AddStringToDraw(sign->center - sign_half_width, sign->top, string_normal, params_1, params_2, colour, sign->width_normal);
    01097   } else {
    01098     int shadow_offset = 0;
    01099     if (string_small_shadow != STR_NULL) {
    01100       shadow_offset = 4;
    01101       AddStringToDraw(sign->center - sign_half_width + shadow_offset, sign->top, string_small_shadow, params_1, params_2, INVALID_COLOUR, sign->width_small);
    01102     }
    01103     AddStringToDraw(sign->center - sign_half_width, sign->top - shadow_offset, string_small, params_1, params_2,
    01104         colour, sign->width_small | 0x8000);
    01105   }
    01106 }
    01107
    01108 static void ViewportAddTownNames(DrawPixelInfo *dpi)
    01109 {
    01110   if (!HasBit(_display_opt, DO_SHOW_TOWN_NAMES) || _game_mode == GM_MENU) return;
    01111
    01112   const Town *t;
    01113   FOR_ALL_TOWNS(t) {
    01114     ViewportAddString(dpi, ZOOM_LVL_OUT_4X, &t->sign,
    01115         _settings_client.gui.population_in_label ? STR_VIEWPORT_TOWN_POP : STR_VIEWPORT_TOWN,
    01116         STR_VIEWPORT_TOWN_TINY_WHITE, STR_VIEWPORT_TOWN_TINY_BLACK,
    01117         t->index, t->population);
    01118   }
    01119 }
    01120
    01121
    01122 static void ViewportAddStationNames(DrawPixelInfo *dpi)
    01123 {
    01124   if (!(HasBit(_display_opt, DO_SHOW_STATION_NAMES) || HasBit(_display_opt, DO_SHOW_WAYPOINT_NAMES)) || _game_mode == GM_MENU) return;
    01125
    01126   const BaseStation *st;
    01127   FOR_ALL_BASE_STATIONS(st) {
    01128     /* Check whether the base station is a station or a waypoint */
    01129     bool is_station = Station::IsExpected(st);
    01130
    01131     /* Don't draw if the display options are disabled */
    01132     if (!HasBit(_display_opt, is_station ? DO_SHOW_STATION_NAMES : DO_SHOW_WAYPOINT_NAMES)) continue;
    01133
    01134     ViewportAddString(dpi, ZOOM_LVL_OUT_4X, &st->sign,
    01135         is_station ? STR_VIEWPORT_STATION : STR_VIEWPORT_WAYPOINT,
    01136         (is_station ? STR_VIEWPORT_STATION : STR_VIEWPORT_WAYPOINT) + 1, STR_NULL,
    01137         st->index, st->facilities, (st->owner == OWNER_NONE || !st->IsInUse()) ? COLOUR_GREY : _company_colours[st->owner]);
    01138   }
    01139 }
    01140
    01141
    01142 static void ViewportAddSigns(DrawPixelInfo *dpi)
    01143 {
    01144   /* Signs are turned off or are invisible */
    01145   if (!HasBit(_display_opt, DO_SHOW_SIGNS) || IsInvisibilitySet(TO_SIGNS)) return;
    01146
    01147   const Sign *si;
    01148   FOR_ALL_SIGNS(si) {
    01149     ViewportAddString(dpi, ZOOM_LVL_OUT_4X, &si->sign,
    01150         STR_WHITE_SIGN,
    01151         IsTransparencySet(TO_SIGNS) ? STR_VIEWPORT_SIGN_SMALL_WHITE : STR_VIEWPORT_SIGN_SMALL_BLACK, STR_NULL,
    01152         si->index, 0, (si->owner == OWNER_NONE) ? COLOUR_GREY : _company_colours[si->owner]);
    01153   }
    01154 }
    01155
    01162 void ViewportSign::UpdatePosition(int center, int top, StringID str)
    01163 {
    01164   if (this->width_normal != 0) this->MarkDirty();
    01165
    01166   this->top = top;
    01167
    01168   char buffer[DRAW_STRING_BUFFER];
    01169
    01170   GetString(buffer, str, lastof(buffer));
    01171   this->width_normal = VPSM_LEFT + Align(GetStringBoundingBox(buffer).width, 2) + VPSM_RIGHT;
    01172   this->center = center;
    01173
    01174   /* zoomed out version */
    01175   _cur_fontsize = FS_SMALL;
    01176   this->width_small = VPSM_LEFT + Align(GetStringBoundingBox(buffer).width, 2) + VPSM_RIGHT;
    01177   _cur_fontsize = FS_NORMAL;
    01178
    01179   this->MarkDirty();
    01180 }
    01181
    01187 void ViewportSign::MarkDirty() const
    01188 {
    01189   /* We use ZOOM_LVL_MAX here, as every viewport can have an other zoom,
    01190    *  and there is no way for us to know which is the biggest. So make the
    01191    *  biggest area dirty, and we are safe for sure.
    01192    * We also add 1 to make sure the whole thing is redrawn. */
    01193   MarkAllViewportsDirty(
    01194     this->center - ScaleByZoom(this->width_normal / 2 + 1, ZOOM_LVL_MAX),
    01195     this->top    - ScaleByZoom(1, ZOOM_LVL_MAX),
    01196     this->center + ScaleByZoom(this->width_normal / 2 + 1, ZOOM_LVL_MAX),
    01197     this->top    + ScaleByZoom(VPSM_TOP + FONT_HEIGHT_NORMAL + VPSM_BOTTOM + 1, ZOOM_LVL_MAX));
    01198 }
    01199
    01200 static void ViewportDrawTileSprites(const TileSpriteToDrawVector *tstdv)
    01201 {
    01202   const TileSpriteToDraw *tsend = tstdv->End();
    01203   for (const TileSpriteToDraw *ts = tstdv->Begin(); ts != tsend; ++ts) {
    01204     DrawSprite(ts->image, ts->pal, ts->x, ts->y, ts->sub);
    01205   }
    01206 }
    01207
    01209 static void ViewportSortParentSprites(ParentSpriteToSortVector *psdv)
    01210 {
    01211   ParentSpriteToDraw **psdvend = psdv->End();
    01212   ParentSpriteToDraw **psd = psdv->Begin();
    01213   while (psd != psdvend) {
    01214     ParentSpriteToDraw *ps = *psd;
    01215
    01216     if (ps->comparison_done) {
    01217       psd++;
    01218       continue;
    01219     }
    01220
    01221     ps->comparison_done = true;
    01222
    01223     for (ParentSpriteToDraw **psd2 = psd + 1; psd2 != psdvend; psd2++) {
    01224       ParentSpriteToDraw *ps2 = *psd2;
    01225
    01226       if (ps2->comparison_done) continue;
    01227
    01228       /* Decide which comparator to use, based on whether the bounding
    01229        * boxes overlap
    01230        */
    01231       if (ps->xmax >= ps2->xmin && ps->xmin <= ps2->xmax && // overlap in X?
    01232           ps->ymax >= ps2->ymin && ps->ymin <= ps2->ymax && // overlap in Y?
    01233           ps->zmax >= ps2->zmin && ps->zmin <= ps2->zmax) { // overlap in Z?
    01234         /* Use X+Y+Z as the sorting order, so sprites closer to the bottom of
    01235          * the screen and with higher Z elevation, are drawn in front.
    01236          * Here X,Y,Z are the coordinates of the "center of mass" of the sprite,
    01237          * i.e. X=(left+right)/2, etc.
    01238          * However, since we only care about order, don't actually divide / 2
    01239          */
    01240         if (ps->xmin + ps->xmax + ps->ymin + ps->ymax + ps->zmin + ps->zmax <=
    01241             ps2->xmin + ps2->xmax + ps2->ymin + ps2->ymax + ps2->zmin + ps2->zmax) {
    01242           continue;
    01243         }
    01244       } else {
    01245         /* We only change the order, if it is definite.
    01246          * I.e. every single order of X, Y, Z says ps2 is behind ps or they overlap.
    01247          * That is: If one partial order says ps behind ps2, do not change the order.
    01248          */
    01249         if (ps->xmax < ps2->xmin ||
    01250             ps->ymax < ps2->ymin ||
    01251             ps->zmax < ps2->zmin) {
    01252           continue;
    01253         }
    01254       }
    01255
    01256       /* Move ps2 in front of ps */
    01257       ParentSpriteToDraw *temp = ps2;
    01258       for (ParentSpriteToDraw **psd3 = psd2; psd3 > psd; psd3--) {
    01259         *psd3 = *(psd3 - 1);
    01260       }
    01261       *psd = temp;
    01262     }
    01263   }
    01264 }
    01265
    01266 static void ViewportDrawParentSprites(const ParentSpriteToSortVector *psd, const ChildScreenSpriteToDrawVector *csstdv)
    01267 {
    01268   const ParentSpriteToDraw * const *psd_end = psd->End();
    01269   for (const ParentSpriteToDraw * const *it = psd->Begin(); it != psd_end; it++) {
    01270     const ParentSpriteToDraw *ps = *it;
    01271     if (ps->image != SPR_EMPTY_BOUNDING_BOX) DrawSprite(ps->image, ps->pal, ps->x, ps->y, ps->sub);
    01272
    01273     int child_idx = ps->first_child;
    01274     while (child_idx >= 0) {
    01275       const ChildScreenSpriteToDraw *cs = csstdv->Get(child_idx);
    01276       child_idx = cs->next;
    01277       DrawSprite(cs->image, cs->pal, ps->left + cs->x, ps->top + cs->y, cs->sub);
    01278     }
    01279   }
    01280 }
    01281
    01286 static void ViewportDrawBoundingBoxes(const ParentSpriteToSortVector *psd)
    01287 {
    01288   const ParentSpriteToDraw * const *psd_end = psd->End();
    01289   for (const ParentSpriteToDraw * const *it = psd->Begin(); it != psd_end; it++) {
    01290     const ParentSpriteToDraw *ps = *it;
    01291     Point pt1 = RemapCoords(ps->xmax + 1, ps->ymax + 1, ps->zmax + 1); // top front corner
    01292     Point pt2 = RemapCoords(ps->xmin    , ps->ymax + 1, ps->zmax + 1); // top left corner
    01293     Point pt3 = RemapCoords(ps->xmax + 1, ps->ymin    , ps->zmax + 1); // top right corner
    01294     Point pt4 = RemapCoords(ps->xmax + 1, ps->ymax + 1, ps->zmin    ); // bottom front corner
    01295
    01296     DrawBox(        pt1.x,         pt1.y,
    01297             pt2.x - pt1.x, pt2.y - pt1.y,
    01298             pt3.x - pt1.x, pt3.y - pt1.y,
    01299             pt4.x - pt1.x, pt4.y - pt1.y);
    01300   }
    01301 }
    01302
    01303 static void ViewportDrawStrings(DrawPixelInfo *dpi, const StringSpriteToDrawVector *sstdv)
    01304 {
    01305   DrawPixelInfo dp;
    01306   ZoomLevel zoom;
    01307
    01308   _cur_dpi = &dp;
    01309   dp = *dpi;
    01310
    01311   zoom = dp.zoom;
    01312   dp.zoom = ZOOM_LVL_NORMAL;
    01313
    01314   dp.left   = UnScaleByZoom(dp.left,   zoom);
    01315   dp.top    = UnScaleByZoom(dp.top,    zoom);
    01316   dp.width  = UnScaleByZoom(dp.width,  zoom);
    01317   dp.height = UnScaleByZoom(dp.height, zoom);
    01318
    01319   const StringSpriteToDraw *ssend = sstdv->End();
    01320   for (const StringSpriteToDraw *ss = sstdv->Begin(); ss != ssend; ++ss) {
    01321     TextColour colour = TC_BLACK;
    01322     bool small = HasBit(ss->width, 15);
    01323     int w = GB(ss->width, 0, 15);
    01324     int x = UnScaleByZoom(ss->x, zoom);
    01325     int y = UnScaleByZoom(ss->y, zoom);
    01326     int h = VPSM_TOP + (small ? FONT_HEIGHT_SMALL : FONT_HEIGHT_NORMAL) + VPSM_BOTTOM;
    01327
    01328     SetDParam(0, ss->params[0]);
    01329     SetDParam(1, ss->params[1]);
    01330
    01331     if (ss->colour != INVALID_COLOUR) {
    01332       /* Do not draw signs nor station names if they are set invisible */
    01333       if (IsInvisibilitySet(TO_SIGNS) && ss->string != STR_WHITE_SIGN) continue;
    01334
    01335       /* if we didn't draw a rectangle, or if transparant building is on,
    01336        * draw the text in the colour the rectangle would have */
    01337       if (IsTransparencySet(TO_SIGNS) && ss->string != STR_WHITE_SIGN) {
    01338         /* Real colours need the IS_PALETTE_COLOUR flag
    01339          * otherwise colours from _string_colourmap are assumed. */
    01340         colour = (TextColour)_colour_gradient[ss->colour][6] | IS_PALETTE_COLOUR;
    01341       }
    01342
    01343       /* Draw the rectangle if 'tranparent station signs' is off,
    01344        * or if we are drawing a general text sign (STR_WHITE_SIGN) */
    01345       if (!IsTransparencySet(TO_SIGNS) || ss->string == STR_WHITE_SIGN) {
    01346         DrawFrameRect(
    01347           x, y, x + w, y + h, ss->colour,
    01348           IsTransparencySet(TO_SIGNS) ? FR_TRANSPARENT : FR_NONE
    01349         );
    01350       }
    01351     }
    01352
    01353     DrawString(x + VPSM_LEFT, x + w - 1 - VPSM_RIGHT, y + VPSM_TOP, ss->string, colour, SA_CENTER);
    01354   }
    01355 }
    01356
    01357 void ViewportDoDraw(const ViewPort *vp, int left, int top, int right, int bottom)
    01358 {
    01359   DrawPixelInfo *old_dpi = _cur_dpi;
    01360   _cur_dpi = &_vd.dpi;
    01361
    01362   _vd.dpi.zoom = vp->zoom;
    01363   int mask = ScaleByZoom(-1, vp->zoom);
    01364
    01365   _vd.combine_sprites = SPRITE_COMBINE_NONE;
    01366
    01367   _vd.dpi.width = (right - left) & mask;
    01368   _vd.dpi.height = (bottom - top) & mask;
    01369   _vd.dpi.left = left & mask;
    01370   _vd.dpi.top = top & mask;
    01371   _vd.dpi.pitch = old_dpi->pitch;
    01372   _vd.last_child = NULL;
    01373
    01374   int x = UnScaleByZoom(_vd.dpi.left - (vp->virtual_left & mask), vp->zoom) + vp->left;
    01375   int y = UnScaleByZoom(_vd.dpi.top - (vp->virtual_top & mask), vp->zoom) + vp->top;
    01376
    01377   _vd.dpi.dst_ptr = BlitterFactoryBase::GetCurrentBlitter()->MoveTo(old_dpi->dst_ptr, x - old_dpi->left, y - old_dpi->top);
    01378
    01379   ViewportAddLandscape();
    01380   ViewportAddVehicles(&_vd.dpi);
    01381
    01382   ViewportAddTownNames(&_vd.dpi);
    01383   ViewportAddStationNames(&_vd.dpi);
    01384   ViewportAddSigns(&_vd.dpi);
    01385
    01386   DrawTextEffects(&_vd.dpi);
    01387
    01388   if (_vd.tile_sprites_to_draw.Length() != 0) ViewportDrawTileSprites(&_vd.tile_sprites_to_draw);
    01389
    01390   ParentSpriteToDraw *psd_end = _vd.parent_sprites_to_draw.End();
    01391   for (ParentSpriteToDraw *it = _vd.parent_sprites_to_draw.Begin(); it != psd_end; it++) {
    01392     *_vd.parent_sprites_to_sort.Append() = it;
    01393   }
    01394
    01395   ViewportSortParentSprites(&_vd.parent_sprites_to_sort);
    01396   ViewportDrawParentSprites(&_vd.parent_sprites_to_sort, &_vd.child_screen_sprites_to_draw);
    01397
    01398   if (_draw_bounding_boxes) ViewportDrawBoundingBoxes(&_vd.parent_sprites_to_sort);
    01399
    01400   if (_vd.string_sprites_to_draw.Length() != 0) ViewportDrawStrings(&_vd.dpi, &_vd.string_sprites_to_draw);
    01401
    01402   _cur_dpi = old_dpi;
    01403
    01404   _vd.string_sprites_to_draw.Clear();
    01405   _vd.tile_sprites_to_draw.Clear();
    01406   _vd.parent_sprites_to_draw.Clear();
    01407   _vd.parent_sprites_to_sort.Clear();
    01408   _vd.child_screen_sprites_to_draw.Clear();
    01409 }
    01410
    01413 static void ViewportDrawChk(const ViewPort *vp, int left, int top, int right, int bottom)
    01414 {
    01415   if (ScaleByZoom(bottom - top, vp->zoom) * ScaleByZoom(right - left, vp->zoom) > 180000) {
    01416     if ((bottom - top) > (right - left)) {
    01417       int t = (top + bottom) >> 1;
    01418       ViewportDrawChk(vp, left, top, right, t);
    01419       ViewportDrawChk(vp, left, t, right, bottom);
    01420     } else {
    01421       int t = (left + right) >> 1;
    01422       ViewportDrawChk(vp, left, top, t, bottom);
    01423       ViewportDrawChk(vp, t, top, right, bottom);
    01424     }
    01425   } else {
    01426     ViewportDoDraw(vp,
    01427       ScaleByZoom(left - vp->left, vp->zoom) + vp->virtual_left,
    01428       ScaleByZoom(top - vp->top, vp->zoom) + vp->virtual_top,
    01429       ScaleByZoom(right - vp->left, vp->zoom) + vp->virtual_left,
    01430       ScaleByZoom(bottom - vp->top, vp->zoom) + vp->virtual_top
    01431     );
    01432   }
    01433 }
    01434
    01435 static inline void ViewportDraw(const ViewPort *vp, int left, int top, int right, int bottom)
    01436 {
    01437   if (right <= vp->left || bottom <= vp->top) return;
    01438
    01439   if (left >= vp->left + vp->width) return;
    01440
    01441   if (left < vp->left) left = vp->left;
    01442   if (right > vp->left + vp->width) right = vp->left + vp->width;
    01443
    01444   if (top >= vp->top + vp->height) return;
    01445
    01446   if (top < vp->top) top = vp->top;
    01447   if (bottom > vp->top + vp->height) bottom = vp->top + vp->height;
    01448
    01449   ViewportDrawChk(vp, left, top, right, bottom);
    01450 }
    01451
    01455 void Window::DrawViewport() const
    01456 {
    01457   DrawPixelInfo *dpi = _cur_dpi;
    01458
    01459   dpi->left += this->left;
    01460   dpi->top += this->top;
    01461
    01462   ViewportDraw(this->viewport, dpi->left, dpi->top, dpi->left + dpi->width, dpi->top + dpi->height);
    01463
    01464   dpi->left -= this->left;
    01465   dpi->top -= this->top;
    01466 }
    01467
    01468 static inline void ClampViewportToMap(const ViewPort *vp, int &x, int &y)
    01469 {
    01470   /* Centre of the viewport is hot spot */
    01471   x += vp->virtual_width / 2;
    01472   y += vp->virtual_height / 2;
    01473
    01474   /* Convert viewport coordinates to map coordinates
    01475    * Calculation is scaled by 4 to avoid rounding errors */
    01476   int vx = -x + y * 2;
    01477   int vy =  x + y * 2;
    01478
    01479   /* clamp to size of map */
    01480   vx = Clamp(vx, 0, MapMaxX() * TILE_SIZE * 4);
    01481   vy = Clamp(vy, 0, MapMaxY() * TILE_SIZE * 4);
    01482
    01483   /* Convert map coordinates to viewport coordinates */
    01484   x = (-vx + vy) / 2;
    01485   y = ( vx + vy) / 4;
    01486
    01487   /* Remove centreing */
    01488   x -= vp->virtual_width / 2;
    01489   y -= vp->virtual_height / 2;
    01490 }
    01491
    01496 void UpdateViewportPosition(Window *w)
    01497 {
    01498   const ViewPort *vp = w->viewport;
    01499
    01500   if (w->viewport->follow_vehicle != INVALID_VEHICLE) {
    01501     const Vehicle *veh = Vehicle::Get(w->viewport->follow_vehicle);
    01502     Point pt = MapXYZToViewport(vp, veh->x_pos, veh->y_pos, veh->z_pos);
    01503
    01504     w->viewport->scrollpos_x = pt.x;
    01505     w->viewport->scrollpos_y = pt.y;
    01506     SetViewportPosition(w, pt.x, pt.y);
    01507   } else {
    01508     /* Ensure the destination location is within the map */
    01509     ClampViewportToMap(vp, w->viewport->dest_scrollpos_x, w->viewport->dest_scrollpos_y);
    01510
    01511     int delta_x = w->viewport->dest_scrollpos_x - w->viewport->scrollpos_x;
    01512     int delta_y = w->viewport->dest_scrollpos_y - w->viewport->scrollpos_y;
    01513
    01514     if (delta_x != 0 || delta_y != 0) {
    01515       if (_settings_client.gui.smooth_scroll) {
    01516         int max_scroll = ScaleByMapSize1D(512);
    01517         /* Not at our desired positon yet... */
    01518         w->viewport->scrollpos_x += Clamp(delta_x / 4, -max_scroll, max_scroll);
    01519         w->viewport->scrollpos_y += Clamp(delta_y / 4, -max_scroll, max_scroll);
    01520       } else {
    01521         w->viewport->scrollpos_x = w->viewport->dest_scrollpos_x;
    01522         w->viewport->scrollpos_y = w->viewport->dest_scrollpos_y;
    01523       }
    01524     }
    01525
    01526     ClampViewportToMap(vp, w->viewport->scrollpos_x, w->viewport->scrollpos_y);
    01527
    01528     SetViewportPosition(w, w->viewport->scrollpos_x, w->viewport->scrollpos_y);
    01529   }
    01530 }
    01531
    01541 static void MarkViewportDirty(const ViewPort *vp, int left, int top, int right, int bottom)
    01542 {
    01543   right -= vp->virtual_left;
    01544   if (right <= 0) return;
    01545
    01546   bottom -= vp->virtual_top;
    01547   if (bottom <= 0) return;
    01548
    01549   left = max(0, left - vp->virtual_left);
    01550
    01551   if (left >= vp->virtual_width) return;
    01552
    01553   top = max(0, top - vp->virtual_top);
    01554
    01555   if (top >= vp->virtual_height) return;
    01556
    01557   SetDirtyBlocks(
    01558     UnScaleByZoomLower(left, vp->zoom) + vp->left,
    01559     UnScaleByZoomLower(top, vp->zoom) + vp->top,
    01560     UnScaleByZoom(right, vp->zoom) + vp->left + 1,
    01561     UnScaleByZoom(bottom, vp->zoom) + vp->top + 1
    01562   );
    01563 }
    01564
    01573 void MarkAllViewportsDirty(int left, int top, int right, int bottom)
    01574 {
    01575   Window *w;
    01576   FOR_ALL_WINDOWS_FROM_BACK(w) {
    01577     ViewPort *vp = w->viewport;
    01578     if (vp != NULL) {
    01579       assert(vp->width != 0);
    01580       MarkViewportDirty(vp, left, top, right, bottom);
    01581     }
    01582   }
    01583 }
    01584
    01585 void MarkTileDirtyByTile(TileIndex tile)
    01586 {
    01587   Point pt = RemapCoords(TileX(tile) * TILE_SIZE, TileY(tile) * TILE_SIZE, GetTileZ(tile));
    01588   MarkAllViewportsDirty(
    01589     pt.x - 31,
    01590     pt.y - 122,
    01591     pt.x - 31 + 67,
    01592     pt.y - 122 + 154
    01593   );
    01594 }
    01595
    01603 static void SetSelectionTilesDirty()
    01604 {
    01605   int x_start = _thd.pos.x;
    01606   int y_start = _thd.pos.y;
    01607
    01608   int x_size = _thd.size.x;
    01609   int y_size = _thd.size.y;
    01610
    01611   if (_thd.outersize.x != 0) {
    01612     x_size  += _thd.outersize.x;
    01613     x_start += _thd.offs.x;
    01614     y_size  += _thd.outersize.y;
    01615     y_start += _thd.offs.y;
    01616   }
    01617
    01618   x_size -= TILE_SIZE;
    01619   y_size -= TILE_SIZE;
    01620
    01621   assert(x_size >= 0);
    01622   assert(y_size >= 0);
    01623
    01624   int x_end = Clamp(x_start + x_size, 0, MapSizeX() * TILE_SIZE - TILE_SIZE);
    01625   int y_end = Clamp(y_start + y_size, 0, MapSizeY() * TILE_SIZE - TILE_SIZE);
    01626
    01627   x_start = Clamp(x_start, 0, MapSizeX() * TILE_SIZE - TILE_SIZE);
    01628   y_start = Clamp(y_start, 0, MapSizeY() * TILE_SIZE - TILE_SIZE);
    01629
    01630   /* make sure everything is multiple of TILE_SIZE */
    01631   assert((x_end | y_end | x_start | y_start) % TILE_SIZE == 0);
    01632
    01633   /* How it works:
    01634    * Suppose we have to mark dirty rectangle of 3x4 tiles:
    01635    *   x
    01636    *  xxx
    01637    * xxxxx
    01638    *  xxxxx
    01639    *   xxx
    01640    *    x
    01641    * This algorithm marks dirty columns of tiles, so it is done in 3+4-1 steps:
    01642    * 1)  x     2)  x
    01643    *    xxx       Oxx
    01644    *   Oxxxx     xOxxx
    01645    *    xxxxx     Oxxxx
    01646    *     xxx       xxx
    01647    *      x         x
    01648    * And so forth...
    01649    */
    01650
    01651   int top_x = x_end; // coordinates of top dirty tile
    01652   int top_y = y_start;
    01653   int bot_x = top_x; // coordinates of bottom dirty tile
    01654   int bot_y = top_y;
    01655
    01656   do {
    01657     Point top = RemapCoords2(top_x, top_y); // topmost dirty point
    01658     Point bot = RemapCoords2(bot_x + TILE_SIZE - 1, bot_y + TILE_SIZE - 1); // bottommost point
    01659
    01660     /* the 'x' coordinate of 'top' and 'bot' is the same (and always in the same distance from tile middle),
    01661      * tile height/slope affects only the 'y' on-screen coordinate! */
    01662
    01663     int l = top.x - (TILE_PIXELS - 2); // 'x' coordinate of left side of dirty rectangle
    01664     int t = top.y;                     // 'y' coordinate of top side -//-
    01665     int r = top.x + (TILE_PIXELS - 2); // right side of dirty rectangle
    01666     int b = bot.y;                     // bottom -//-
    01667
    01668     static const int OVERLAY_WIDTH = 4; // part of selection sprites is drawn outside the selected area
    01669
    01670     /* For halftile foundations on SLOPE_STEEP_S the sprite extents some more towards the top */
    01671     MarkAllViewportsDirty(l - OVERLAY_WIDTH, t - OVERLAY_WIDTH - TILE_HEIGHT, r + OVERLAY_WIDTH, b + OVERLAY_WIDTH);
    01672
    01673     /* haven't we reached the topmost tile yet? */
    01674     if (top_x != x_start) {
    01675       top_x -= TILE_SIZE;
    01676     } else {
    01677       top_y += TILE_SIZE;
    01678     }
    01679
    01680     /* the way the bottom tile changes is different when we reach the bottommost tile */
    01681     if (bot_y != y_end) {
    01682       bot_y += TILE_SIZE;
    01683     } else {
    01684       bot_x -= TILE_SIZE;
    01685     }
    01686   } while (bot_x >= top_x);
    01687 }
    01688
    01689
    01690 void SetSelectionRed(bool b)
    01691 {
    01692   _thd.make_square_red = b;
    01693   SetSelectionTilesDirty();
    01694 }
    01695
    01704 static bool CheckClickOnViewportSign(const ViewPort *vp, int x, int y, const ViewportSign *sign)
    01705 {
    01706   bool small = (vp->zoom >= ZOOM_LVL_OUT_4X);
    01707   int sign_half_width = ScaleByZoom((small ? sign->width_small : sign->width_normal) / 2, vp->zoom);
    01708   int sign_height = ScaleByZoom(VPSM_TOP + (small ? FONT_HEIGHT_SMALL : FONT_HEIGHT_NORMAL) + VPSM_BOTTOM, vp->zoom);
    01709
    01710   x = ScaleByZoom(x - vp->left, vp->zoom) + vp->virtual_left;
    01711   y = ScaleByZoom(y - vp->top, vp->zoom) + vp->virtual_top;
    01712
    01713   return
    01714       y >= sign->top &&
    01715       y <  sign->top + sign_height &&
    01716       x >= sign->center - sign_half_width &&
    01717       x <  sign->center + sign_half_width;
    01718 }
    01719
    01720 static bool CheckClickOnTown(const ViewPort *vp, int x, int y)
    01721 {
    01722   if (!HasBit(_display_opt, DO_SHOW_TOWN_NAMES)) return false;
    01723
    01724   const Town *t;
    01725   FOR_ALL_TOWNS(t) {
    01726     if (CheckClickOnViewportSign(vp, x, y, &t->sign)) {
    01727       ShowTownViewWindow(t->index);
    01728       return true;
    01729     }
    01730   }
    01731
    01732   return false;
    01733 }
    01734
    01735 static bool CheckClickOnStation(const ViewPort *vp, int x, int y)
    01736 {
    01737   if (!(HasBit(_display_opt, DO_SHOW_STATION_NAMES) || HasBit(_display_opt, DO_SHOW_WAYPOINT_NAMES)) || IsInvisibilitySet(TO_SIGNS)) return false;
    01738
    01739   const BaseStation *st;
    01740   FOR_ALL_BASE_STATIONS(st) {
    01741     /* Check whether the base station is a station or a waypoint */
    01742     bool is_station = Station::IsExpected(st);
    01743
    01744     /* Don't check if the display options are disabled */
    01745     if (!HasBit(_display_opt, is_station ? DO_SHOW_STATION_NAMES : DO_SHOW_WAYPOINT_NAMES)) continue;
    01746
    01747     if (CheckClickOnViewportSign(vp, x, y, &st->sign)) {
    01748       if (is_station) {
    01749         ShowStationViewWindow(st->index);
    01750       } else {
    01751         ShowWaypointWindow(Waypoint::From(st));
    01752       }
    01753       return true;
    01754     }
    01755   }
    01756
    01757   return false;
    01758 }
    01759
    01760
    01761 static bool CheckClickOnSign(const ViewPort *vp, int x, int y)
    01762 {
    01763   /* Signs are turned off, or they are transparent and invisibility is ON, or company is a spectator */
    01764   if (!HasBit(_display_opt, DO_SHOW_SIGNS) || IsInvisibilitySet(TO_SIGNS) || _current_company == COMPANY_SPECTATOR) return false;
    01765
    01766   const Sign *si;
    01767   FOR_ALL_SIGNS(si) {
    01768     if (CheckClickOnViewportSign(vp, x, y, &si->sign)) {
    01769       HandleClickOnSign(si);
    01770       return true;
    01771     }
    01772   }
    01773
    01774   return false;
    01775 }
    01776
    01777
    01778 static bool CheckClickOnLandscape(const ViewPort *vp, int x, int y)
    01779 {
    01780   Point pt = TranslateXYToTileCoord(vp, x, y);
    01781
    01782   if (pt.x != -1) return ClickTile(TileVirtXY(pt.x, pt.y));
    01783   return true;
    01784 }
    01785
    01786
    01787 bool HandleViewportClicked(const ViewPort *vp, int x, int y)
    01788 {
    01789   const Vehicle *v;
    01790
    01791   if (CheckClickOnTown(vp, x, y)) return true;
    01792   if (CheckClickOnStation(vp, x, y)) return true;
    01793   if (CheckClickOnSign(vp, x, y)) return true;
    01794   CheckClickOnLandscape(vp, x, y);
    01795
    01796   v = CheckClickOnVehicle(vp, x, y);
    01797   if (v != NULL) {
    01798     DEBUG(misc, 2, "Vehicle %d (index %d) at %p", v->unitnumber, v->index, v);
    01799     if (IsCompanyBuildableVehicleType(v)) ShowVehicleViewWindow(v->First());
    01800     return true;
    01801   }
    01802   return CheckClickOnLandscape(vp, x, y);
    01803 }
    01804
    01805 Vehicle *CheckMouseOverVehicle()
    01806 {
    01807   const Window *w;
    01808   const ViewPort *vp;
    01809
    01810   int x = _cursor.pos.x;
    01811   int y = _cursor.pos.y;
    01812
    01813   w = FindWindowFromPt(x, y);
    01814   if (w == NULL) return NULL;
    01815
    01816   vp = IsPtInWindowViewport(w, x, y);
    01817   return (vp != NULL) ? CheckClickOnVehicle(vp, x, y) : NULL;
    01818 }
    01819
    01820
    01821
    01822 void PlaceObject()
    01823 {
    01824   Point pt;
    01825   Window *w;
    01826
    01827   pt = GetTileBelowCursor();
    01828   if (pt.x == -1) return;
    01829
    01830   if (_thd.place_mode == HT_POINT) {
    01831     pt.x += 8;
    01832     pt.y += 8;
    01833   }
    01834
    01835   _tile_fract_coords.x = pt.x & TILE_UNIT_MASK;
    01836   _tile_fract_coords.y = pt.y & TILE_UNIT_MASK;
    01837
    01838   w = GetCallbackWnd();
    01839   if (w != NULL) w->OnPlaceObject(pt, TileVirtXY(pt.x, pt.y));
    01840 }
    01841
    01842
    01851 bool ScrollWindowTo(int x, int y, int z, Window *w, bool instant)
    01852 {
    01853   /* The slope cannot be acquired outside of the map, so make sure we are always within the map. */
    01854   if (z == -1) z = GetSlopeZ(Clamp(x, 0, MapSizeX() * TILE_SIZE - 1), Clamp(y, 0, MapSizeY() * TILE_SIZE - 1));
    01855
    01856   Point pt = MapXYZToViewport(w->viewport, x, y, z);
    01857   w->viewport->follow_vehicle = INVALID_VEHICLE;
    01858
    01859   if (w->viewport->dest_scrollpos_x == pt.x && w->viewport->dest_scrollpos_y == pt.y)
    01860     return false;
    01861
    01862   if (instant) {
    01863     w->viewport->scrollpos_x = pt.x;
    01864     w->viewport->scrollpos_y = pt.y;
    01865   }
    01866
    01867   w->viewport->dest_scrollpos_x = pt.x;
    01868   w->viewport->dest_scrollpos_y = pt.y;
    01869   return true;
    01870 }
    01871
    01872 bool ScrollMainWindowToTile(TileIndex tile, bool instant)
    01873 {
    01874   return ScrollMainWindowTo(TileX(tile) * TILE_SIZE + TILE_SIZE / 2, TileY(tile) * TILE_SIZE + TILE_SIZE / 2, -1, instant);
    01875 }
    01876
    01877 void SetRedErrorSquare(TileIndex tile)
    01878 {
    01879   TileIndex old;
    01880
    01881   old = _thd.redsq;
    01882   _thd.redsq = tile;
    01883
    01884   if (tile != old) {
    01885     if (tile != INVALID_TILE) MarkTileDirtyByTile(tile);
    01886     if (old  != INVALID_TILE) MarkTileDirtyByTile(old);
    01887   }
    01888 }
    01889
    01894 void SetTileSelectSize(int w, int h)
    01895 {
    01896   _thd.new_size.x = w * TILE_SIZE;
    01897   _thd.new_size.y = h * TILE_SIZE;
    01898   _thd.new_outersize.x = 0;
    01899   _thd.new_outersize.y = 0;
    01900 }
    01901
    01902 void SetTileSelectBigSize(int ox, int oy, int sx, int sy)
    01903 {
    01904   _thd.offs.x = ox * TILE_SIZE;
    01905   _thd.offs.y = oy * TILE_SIZE;
    01906   _thd.new_outersize.x = sx * TILE_SIZE;
    01907   _thd.new_outersize.y = sy * TILE_SIZE;
    01908 }
    01909
    01911 static HighLightStyle GetAutorailHT(int x, int y)
    01912 {
    01913   return HT_RAIL | _autorail_piece[x & TILE_UNIT_MASK][y & TILE_UNIT_MASK];
    01914 }
    01915
    01923 void UpdateTileSelection()
    01924 {
    01925   int x1;
    01926   int y1;
    01927
    01928   _thd.new_drawstyle = HT_NONE;
    01929
    01930   if (_thd.place_mode == HT_SPECIAL) {
    01931     x1 = _thd.selend.x;
    01932     y1 = _thd.selend.y;
    01933     if (x1 != -1) {
    01934       int x2 = _thd.selstart.x & ~TILE_UNIT_MASK;
    01935       int y2 = _thd.selstart.y & ~TILE_UNIT_MASK;
    01936       x1 &= ~TILE_UNIT_MASK;
    01937       y1 &= ~TILE_UNIT_MASK;
    01938
    01939       if (x1 >= x2) Swap(x1, x2);
    01940       if (y1 >= y2) Swap(y1, y2);
    01941       _thd.new_pos.x = x1;
    01942       _thd.new_pos.y = y1;
    01943       _thd.new_size.x = x2 - x1 + TILE_SIZE;
    01944       _thd.new_size.y = y2 - y1 + TILE_SIZE;
    01945       _thd.new_drawstyle = _thd.next_drawstyle;
    01946     }
    01947   } else if (_thd.place_mode != HT_NONE) {
    01948     Point pt = GetTileBelowCursor();
    01949     x1 = pt.x;
    01950     y1 = pt.y;
    01951     if (x1 != -1) {
    01952       switch (_thd.place_mode & HT_DRAG_MASK) {
    01953         case HT_RECT:
    01954           _thd.new_drawstyle = HT_RECT;
    01955           break;
    01956         case HT_POINT:
    01957           _thd.new_drawstyle = HT_POINT;
    01958           x1 += TILE_SIZE / 2;
    01959           y1 += TILE_SIZE / 2;
    01960           break;
    01961         case HT_RAIL:
    01962           /* Draw one highlighted tile in any direction */
    01963           _thd.new_drawstyle = GetAutorailHT(pt.x, pt.y);
    01964           break;
    01965         case HT_LINE:
    01966           switch (_thd.place_mode & HT_DIR_MASK) {
    01967             case HT_DIR_X: _thd.new_drawstyle = HT_LINE | HT_DIR_X; break;
    01968             case HT_DIR_Y: _thd.new_drawstyle = HT_LINE | HT_DIR_Y; break;
    01969
    01970             case HT_DIR_HU:
    01971             case HT_DIR_HL:
    01972               _thd.new_drawstyle = (pt.x & TILE_UNIT_MASK) + (pt.y & TILE_UNIT_MASK) <= TILE_SIZE ? HT_LINE | HT_DIR_HU : HT_LINE | HT_DIR_HL;
    01973               break;
    01974
    01975             case HT_DIR_VL:
    01976             case HT_DIR_VR:
    01977               _thd.new_drawstyle = (pt.x & TILE_UNIT_MASK) > (pt.y & TILE_UNIT_MASK) ? HT_LINE | HT_DIR_VL : HT_LINE | HT_DIR_VR;
    01978               break;
    01979
    01980             default: NOT_REACHED();
    01981           }
    01982           _thd.selstart.x = x1 & ~TILE_UNIT_MASK;
    01983           _thd.selstart.y = y1 & ~TILE_UNIT_MASK;
    01984           break;
    01985         default:
    01986           NOT_REACHED();
    01987           break;
    01988       }
    01989       _thd.new_pos.x = x1 & ~TILE_UNIT_MASK;
    01990       _thd.new_pos.y = y1 & ~TILE_UNIT_MASK;
    01991     }
    01992   }
    01993
    01994   /* redraw selection */
    01995   if (_thd.drawstyle != _thd.new_drawstyle ||
    01996       _thd.pos.x != _thd.new_pos.x || _thd.pos.y != _thd.new_pos.y ||
    01997       _thd.size.x != _thd.new_size.x || _thd.size.y != _thd.new_size.y ||
    01998       _thd.outersize.x != _thd.new_outersize.x ||
    01999       _thd.outersize.y != _thd.new_outersize.y) {
    02000     /* clear the old selection? */
    02001     if (_thd.drawstyle) SetSelectionTilesDirty();
    02002
    02003     _thd.drawstyle = _thd.new_drawstyle;
    02004     _thd.pos = _thd.new_pos;
    02005     _thd.size = _thd.new_size;
    02006     _thd.outersize = _thd.new_outersize;
    02007     _thd.dirty = 0xff;
    02008
    02009     /* draw the new selection? */
    02010     if (_thd.new_drawstyle) SetSelectionTilesDirty();
    02011   }
    02012 }
    02013
    02019 static inline void ShowMeasurementTooltips(StringID str, uint paramcount, const uint64 params[])
    02020 {
    02021   if (!_settings_client.gui.measure_tooltip) return;
    02022   GuiShowTooltips(str, paramcount, params, true);
    02023 }
    02024
    02026 void VpStartPlaceSizing(TileIndex tile, ViewportPlaceMethod method, ViewportDragDropSelectionProcess process)
    02027 {
    02028   _thd.select_method = method;
    02029   _thd.select_proc   = process;
    02030   _thd.selend.x = TileX(tile) * TILE_SIZE;
    02031   _thd.selstart.x = TileX(tile) * TILE_SIZE;
    02032   _thd.selend.y = TileY(tile) * TILE_SIZE;
    02033   _thd.selstart.y = TileY(tile) * TILE_SIZE;
    02034
    02035   /* Needed so several things (road, autoroad, bridges, ...) are placed correctly.
    02036    * In effect, placement starts from the centre of a tile
    02037    */
    02038   if (method == VPM_X_OR_Y || method == VPM_FIX_X || method == VPM_FIX_Y) {
    02039     _thd.selend.x += TILE_SIZE / 2;
    02040     _thd.selend.y += TILE_SIZE / 2;
    02041     _thd.selstart.x += TILE_SIZE / 2;
    02042     _thd.selstart.y += TILE_SIZE / 2;
    02043   }
    02044
    02045   if (_thd.place_mode == HT_RECT) {
    02046     _thd.place_mode = HT_SPECIAL;
    02047     _thd.next_drawstyle = HT_RECT;
    02048   } else if (_thd.place_mode & (HT_RAIL | HT_LINE)) {
    02049     _thd.place_mode = HT_SPECIAL;
    02050     _thd.next_drawstyle = _thd.drawstyle;
    02051   } else {
    02052     _thd.place_mode = HT_SPECIAL;
    02053     _thd.next_drawstyle = HT_POINT;
    02054   }
    02055   _special_mouse_mode = WSM_SIZING;
    02056 }
    02057
    02058 void VpSetPlaceSizingLimit(int limit)
    02059 {
    02060   _thd.sizelimit = limit;
    02061 }
    02062
    02067 void VpSetPresizeRange(TileIndex from, TileIndex to)
    02068 {
    02069   uint64 distance = DistanceManhattan(from, to) + 1;
    02070
    02071   _thd.selend.x = TileX(to) * TILE_SIZE;
    02072   _thd.selend.y = TileY(to) * TILE_SIZE;
    02073   _thd.selstart.x = TileX(from) * TILE_SIZE;
    02074   _thd.selstart.y = TileY(from) * TILE_SIZE;
    02075   _thd.next_drawstyle = HT_RECT;
    02076
    02077   /* show measurement only if there is any length to speak of */
    02078   if (distance > 1) ShowMeasurementTooltips(STR_MEASURE_LENGTH, 1, &distance);
    02079 }
    02080
    02081 static void VpStartPreSizing()
    02082 {
    02083   _thd.selend.x = -1;
    02084   _special_mouse_mode = WSM_PRESIZE;
    02085 }
    02086
    02089 static HighLightStyle Check2x1AutoRail(int mode)
    02090 {
    02091   int fxpy = _tile_fract_coords.x + _tile_fract_coords.y;
    02092   int sxpy = (_thd.selend.x & TILE_UNIT_MASK) + (_thd.selend.y & TILE_UNIT_MASK);
    02093   int fxmy = _tile_fract_coords.x - _tile_fract_coords.y;
    02094   int sxmy = (_thd.selend.x & TILE_UNIT_MASK) - (_thd.selend.y & TILE_UNIT_MASK);
    02095
    02096   switch (mode) {
    02097     default: NOT_REACHED();
    02098     case 0: // end piece is lower right
    02099       if (fxpy >= 20 && sxpy <= 12) return HT_DIR_HL;
    02100       if (fxmy < -3 && sxmy > 3) return HT_DIR_VR;
    02101       return HT_DIR_Y;
    02102
    02103     case 1:
    02104       if (fxmy > 3 && sxmy < -3) return HT_DIR_VL;
    02105       if (fxpy <= 12 && sxpy >= 20) return HT_DIR_HU;
    02106       return HT_DIR_Y;
    02107
    02108     case 2:
    02109       if (fxmy > 3 && sxmy < -3) return HT_DIR_VL;
    02110       if (fxpy >= 20 && sxpy <= 12) return HT_DIR_HL;
    02111       return HT_DIR_X;
    02112
    02113     case 3:
    02114       if (fxmy < -3 && sxmy > 3) return HT_DIR_VR;
    02115       if (fxpy <= 12 && sxpy >= 20) return HT_DIR_HU;
    02116       return HT_DIR_X;
    02117   }
    02118 }
    02119
    02131 static bool SwapDirection(HighLightStyle style, TileIndex start_tile, TileIndex end_tile)
    02132 {
    02133   uint start_x = TileX(start_tile);
    02134   uint start_y = TileY(start_tile);
    02135   uint end_x = TileX(end_tile);
    02136   uint end_y = TileY(end_tile);
    02137
    02138   switch (style & HT_DRAG_MASK) {
    02139     case HT_RAIL:
    02140     case HT_LINE: return (end_x > start_x || (end_x == start_x && end_y > start_y));
    02141
    02142     case HT_RECT:
    02143     case HT_POINT: return (end_x != start_x && end_y < start_y);
    02144     default: NOT_REACHED();
    02145   }
    02146
    02147   return false;
    02148 }
    02149
    02164 static int CalcHeightdiff(HighLightStyle style, uint distance, TileIndex start_tile, TileIndex end_tile)
    02165 {
    02166   bool swap = SwapDirection(style, start_tile, end_tile);
    02167   byte style_t;
    02168   uint h0, h1, ht; // start heigth, end height, and temp variable
    02169
    02170   if (start_tile == end_tile) return 0;
    02171   if (swap) Swap(start_tile, end_tile);
    02172
    02173   switch (style & HT_DRAG_MASK) {
    02174     case HT_RECT: {
    02175       static const TileIndexDiffC heightdiff_area_by_dir[] = {
    02176         /* Start */ {1, 0}, /* Dragging east */ {0, 0}, // Dragging south
    02177         /* End   */ {0, 1}, /* Dragging east */ {1, 1}  // Dragging south
    02178       };
    02179
    02180       /* In the case of an area we can determine whether we were dragging south or
    02181        * east by checking the X-coordinates of the tiles */
    02182       style_t = (byte)(TileX(end_tile) > TileX(start_tile));
    02183       start_tile = TILE_ADD(start_tile, ToTileIndexDiff(heightdiff_area_by_dir[style_t]));
    02184       end_tile   = TILE_ADD(end_tile, ToTileIndexDiff(heightdiff_area_by_dir[2 + style_t]));
    02185     }
    02186     /* Fallthrough */
    02187     case HT_POINT:
    02188       h0 = TileHeight(start_tile);
    02189       h1 = TileHeight(end_tile);
    02190       break;
    02191     default: { // All other types, this is mostly only line/autorail
    02192       static const HighLightStyle flip_style_direction[] = {
    02193         HT_DIR_X, HT_DIR_Y, HT_DIR_HL, HT_DIR_HU, HT_DIR_VR, HT_DIR_VL
    02194       };
    02195       static const TileIndexDiffC heightdiff_line_by_dir[] = {
    02196         /* Start */ {1, 0}, {1, 1}, /* HT_DIR_X  */ {0, 1}, {1, 1}, // HT_DIR_Y
    02197         /* Start */ {1, 0}, {0, 0}, /* HT_DIR_HU */ {1, 0}, {1, 1}, // HT_DIR_HL
    02198         /* Start */ {1, 0}, {1, 1}, /* HT_DIR_VL */ {0, 1}, {1, 1}, // HT_DIR_VR
    02199
    02200         /* Start */ {0, 1}, {0, 0}, /* HT_DIR_X  */ {1, 0}, {0, 0}, // HT_DIR_Y
    02201         /* End   */ {0, 1}, {0, 0}, /* HT_DIR_HU */ {1, 1}, {0, 1}, // HT_DIR_HL
    02202         /* End   */ {1, 0}, {0, 0}, /* HT_DIR_VL */ {0, 0}, {0, 1}, // HT_DIR_VR
    02203       };
    02204
    02205       distance %= 2; // we're only interested if the distance is even or uneven
    02206       style &= HT_DIR_MASK;
    02207
    02208       /* To handle autorail, we do some magic to be able to use a lookup table.
    02209        * Firstly if we drag the other way around, we switch start&end, and if needed
    02210        * also flip the drag-position. Eg if it was on the left, and the distance is even
    02211        * that means the end, which is now the start is on the right */
    02212       if (swap && distance == 0) style = flip_style_direction[style];
    02213
    02214       /* Use lookup table for start-tile based on HighLightStyle direction */
    02215       style_t = style * 2;
    02216       assert(style_t < lengthof(heightdiff_line_by_dir) - 13);
    02217       h0 = TileHeight(TILE_ADD(start_tile, ToTileIndexDiff(heightdiff_line_by_dir[style_t])));
    02218       ht = TileHeight(TILE_ADD(start_tile, ToTileIndexDiff(heightdiff_line_by_dir[style_t + 1])));
    02219       h0 = max(h0, ht);
    02220
    02221       /* Use lookup table for end-tile based on HighLightStyle direction
    02222        * flip around side (lower/upper, left/right) based on distance */
    02223       if (distance == 0) style_t = flip_style_direction[style] * 2;
    02224       assert(style_t < lengthof(heightdiff_line_by_dir) - 13);
    02225       h1 = TileHeight(TILE_ADD(end_tile, ToTileIndexDiff(heightdiff_line_by_dir[12 + style_t])));
    02226       ht = TileHeight(TILE_ADD(end_tile, ToTileIndexDiff(heightdiff_line_by_dir[12 + style_t + 1])));
    02227       h1 = max(h1, ht);
    02228     } break;
    02229   }
    02230
    02231   if (swap) Swap(h0, h1);
    02232   /* Minimap shows height in intervals of 50 meters, let's do the same */
    02233   return (int)(h1 - h0) * 50;
    02234 }
    02235
    02236 static const StringID measure_strings_length[] = {STR_NULL, STR_MEASURE_LENGTH, STR_MEASURE_LENGTH_HEIGHTDIFF};
    02237
    02244 static void CheckUnderflow(int &test, int &other, int mult)
    02245 {
    02246   if (test >= 0) return;
    02247
    02248   other += mult * test;
    02249   test = 0;
    02250 }
    02251
    02259 static void CheckOverflow(int &test, int &other, int max, int mult)
    02260 {
    02261   if (test <= max) return;
    02262
    02263   other += mult * (test - max);
    02264   test = max;
    02265 }
    02266
    02268 static void CalcRaildirsDrawstyle(TileHighlightData *thd, int x, int y, int method)
    02269 {
    02270   HighLightStyle b;
    02271
    02272   int dx = thd->selstart.x - (thd->selend.x & ~TILE_UNIT_MASK);
    02273   int dy = thd->selstart.y - (thd->selend.y & ~TILE_UNIT_MASK);
    02274   uint w = abs(dx) + TILE_SIZE;
    02275   uint h = abs(dy) + TILE_SIZE;
    02276
    02277   if (method & ~(VPM_RAILDIRS | VPM_SIGNALDIRS)) {
    02278     /* We 'force' a selection direction; first four rail buttons. */
    02279     method &= ~(VPM_RAILDIRS | VPM_SIGNALDIRS);
    02280     int raw_dx = thd->selstart.x - thd->selend.x;
    02281     int raw_dy = thd->selstart.y - thd->selend.y;
    02282     switch (method) {
    02283       case VPM_FIX_X:
    02284         b = HT_LINE | HT_DIR_Y;
    02285         x = thd->selstart.x;
    02286         break;
    02287
    02288       case VPM_FIX_Y:
    02289         b = HT_LINE | HT_DIR_X;
    02290         y = thd->selstart.y;
    02291         break;
    02292
    02293       case VPM_FIX_HORIZONTAL:
    02294         if (dx == -dy) {
    02295           /* We are on a straight horizontal line. Determine the 'rail'
    02296            * to build based the sub tile location. */
    02297           b = (x & TILE_UNIT_MASK) + (y & TILE_UNIT_MASK) >= TILE_SIZE ? HT_LINE | HT_DIR_HL : HT_LINE | HT_DIR_HU;
    02298         } else {
    02299           /* We are not on a straight line. Determine the rail to build
    02300            * based on whether we are above or below it. */
    02301           b = dx + dy >= TILE_SIZE ? HT_LINE | HT_DIR_HU : HT_LINE | HT_DIR_HL;
    02302
    02303           /* Calculate where a horizontal line through the start point and
    02304            * a vertical line from the selected end point intersect and
    02305            * use that point as the end point. */
    02306           int offset = (raw_dx - raw_dy) / 2;
    02307           x = thd->selstart.x - (offset & ~TILE_UNIT_MASK);
    02308           y = thd->selstart.y + (offset & ~TILE_UNIT_MASK);
    02309
    02310           /* 'Build' the last half rail tile if needed */
    02311           if ((offset & TILE_UNIT_MASK) > (TILE_SIZE / 2)) {
    02312             if (dx + dy >= TILE_SIZE) {
    02313               x += (dx + dy < 0) ? TILE_SIZE : -TILE_SIZE;
    02314             } else {
    02315               y += (dx + dy < 0) ? TILE_SIZE : -TILE_SIZE;
    02316             }
    02317           }
    02318
    02319           /* Make sure we do not overflow the map! */
    02320           CheckUnderflow(x, y, 1);
    02321           CheckUnderflow(y, x, 1);
    02322           CheckOverflow(x, y, (MapMaxX() - 1) * TILE_SIZE, 1);
    02323           CheckOverflow(y, x, (MapMaxY() - 1) * TILE_SIZE, 1);
    02324           assert(x >= 0 && y >= 0 && x <= (int)MapMaxX() * TILE_SIZE && y <= (int)MapMaxY() * TILE_SIZE);
    02325         }
    02326         break;
    02327
    02328       case VPM_FIX_VERTICAL:
    02329         if (dx == dy) {
    02330           /* We are on a straight vertical line. Determine the 'rail'
    02331            * to build based the sub tile location. */
    02332           b = (x & TILE_UNIT_MASK) > (y & TILE_UNIT_MASK) ? HT_LINE | HT_DIR_VL : HT_LINE | HT_DIR_VR;
    02333         } else {
    02334           /* We are not on a straight line. Determine the rail to build
    02335            * based on whether we are left or right from it. */
    02336           b = dx < dy ? HT_LINE | HT_DIR_VL : HT_LINE | HT_DIR_VR;
    02337
    02338           /* Calculate where a vertical line through the start point and
    02339            * a horizontal line from the selected end point intersect and
    02340            * use that point as the end point. */
    02341           int offset = (raw_dx + raw_dy + TILE_SIZE) / 2;
    02342           x = thd->selstart.x - (offset & ~TILE_UNIT_MASK);
    02343           y = thd->selstart.y - (offset & ~TILE_UNIT_MASK);
    02344
    02345           /* 'Build' the last half rail tile if needed */
    02346           if ((offset & TILE_UNIT_MASK) > (TILE_SIZE / 2)) {
    02347             if (dx - dy < 0) {
    02348               y += (dx > dy) ? TILE_SIZE : -TILE_SIZE;
    02349             } else {
    02350               x += (dx < dy) ? TILE_SIZE : -TILE_SIZE;
    02351             }
    02352           }
    02353
    02354           /* Make sure we do not overflow the map! */
    02355           CheckUnderflow(x, y, -1);
    02356           CheckUnderflow(y, x, -1);
    02357           CheckOverflow(x, y, (MapMaxX() - 1) * TILE_SIZE, -1);
    02358           CheckOverflow(y, x, (MapMaxY() - 1) * TILE_SIZE, -1);
    02359           assert(x >= 0 && y >= 0 && x <= (int)MapMaxX() * TILE_SIZE && y <= (int)MapMaxY() * TILE_SIZE);
    02360         }
    02361         break;
    02362
    02363       default:
    02364         NOT_REACHED();
    02365     }
    02366   } else if (TileVirtXY(thd->selstart.x, thd->selstart.y) == TileVirtXY(x, y)) { // check if we're only within one tile
    02367     if (method & VPM_RAILDIRS) {
    02368       b = GetAutorailHT(x, y);
    02369     } else { // rect for autosignals on one tile
    02370       b = HT_RECT;
    02371     }
    02372   } else if (h == TILE_SIZE) { // Is this in X direction?
    02373     if (dx == TILE_SIZE) { // 2x1 special handling
    02374       b = (Check2x1AutoRail(3)) | HT_LINE;
    02375     } else if (dx == -TILE_SIZE) {
    02376       b = (Check2x1AutoRail(2)) | HT_LINE;
    02377     } else {
    02378       b = HT_LINE | HT_DIR_X;
    02379     }
    02380     y = thd->selstart.y;
    02381   } else if (w == TILE_SIZE) { // Or Y direction?
    02382     if (dy == TILE_SIZE) { // 2x1 special handling
    02383       b = (Check2x1AutoRail(1)) | HT_LINE;
    02384     } else if (dy == -TILE_SIZE) { // 2x1 other direction
    02385       b = (Check2x1AutoRail(0)) | HT_LINE;
    02386     } else {
    02387       b = HT_LINE | HT_DIR_Y;
    02388     }
    02389     x = thd->selstart.x;
    02390   } else if (w > h * 2) { // still count as x dir?
    02391     b = HT_LINE | HT_DIR_X;
    02392     y = thd->selstart.y;
    02393   } else if (h > w * 2) { // still count as y dir?
    02394     b = HT_LINE | HT_DIR_Y;
    02395     x = thd->selstart.x;
    02396   } else { // complicated direction
    02397     int d = w - h;
    02398     thd->selend.x = thd->selend.x & ~TILE_UNIT_MASK;
    02399     thd->selend.y = thd->selend.y & ~TILE_UNIT_MASK;
    02400
    02401     /* four cases. */
    02402     if (x > thd->selstart.x) {
    02403       if (y > thd->selstart.y) {
    02404         /* south */
    02405         if (d == 0) {
    02406           b = (x & TILE_UNIT_MASK) > (y & TILE_UNIT_MASK) ? HT_LINE | HT_DIR_VL : HT_LINE | HT_DIR_VR;
    02407         } else if (d >= 0) {
    02408           x = thd->selstart.x + h;
    02409           b = HT_LINE | HT_DIR_VL;
    02410         } else {
    02411           y = thd->selstart.y + w;
    02412           b = HT_LINE | HT_DIR_VR;
    02413         }
    02414       } else {
    02415         /* west */
    02416         if (d == 0) {
    02417           b = (x & TILE_UNIT_MASK) + (y & TILE_UNIT_MASK) >= TILE_SIZE ? HT_LINE | HT_DIR_HL : HT_LINE | HT_DIR_HU;
    02418         } else if (d >= 0) {
    02419           x = thd->selstart.x + h;
    02420           b = HT_LINE | HT_DIR_HL;
    02421         } else {
    02422           y = thd->selstart.y - w;
    02423           b = HT_LINE | HT_DIR_HU;
    02424         }
    02425       }
    02426     } else {
    02427       if (y > thd->selstart.y) {
    02428         /* east */
    02429         if (d == 0) {
    02430           b = (x & TILE_UNIT_MASK) + (y & TILE_UNIT_MASK) >= TILE_SIZE ? HT_LINE | HT_DIR_HL : HT_LINE | HT_DIR_HU;
    02431         } else if (d >= 0) {
    02432           x = thd->selstart.x - h;
    02433           b = HT_LINE | HT_DIR_HU;
    02434         } else {
    02435           y = thd->selstart.y + w;
    02436           b = HT_LINE | HT_DIR_HL;
    02437         }
    02438       } else {
    02439         /* north */
    02440         if (d == 0) {
    02441           b = (x & TILE_UNIT_MASK) > (y & TILE_UNIT_MASK) ? HT_LINE | HT_DIR_VL : HT_LINE | HT_DIR_VR;
    02442         } else if (d >= 0) {
    02443           x = thd->selstart.x - h;
    02444           b = HT_LINE | HT_DIR_VR;
    02445         } else {
    02446           y = thd->selstart.y - w;
    02447           b = HT_LINE | HT_DIR_VL;
    02448         }
    02449       }
    02450     }
    02451   }
    02452
    02453   if (_settings_client.gui.measure_tooltip) {
    02454     TileIndex t0 = TileVirtXY(thd->selstart.x, thd->selstart.y);
    02455     TileIndex t1 = TileVirtXY(x, y);
    02456     uint distance = DistanceManhattan(t0, t1) + 1;
    02457     byte index = 0;
    02458     uint64 params[2];
    02459
    02460     if (distance != 1) {
    02461       int heightdiff = CalcHeightdiff(b, distance, t0, t1);
    02462       /* If we are showing a tooltip for horizontal or vertical drags,
    02463        * 2 tiles have a length of 1. To bias towards the ceiling we add
    02464        * one before division. It feels more natural to count 3 lengths as 2 */
    02465       if ((b & HT_DIR_MASK) != HT_DIR_X && (b & HT_DIR_MASK) != HT_DIR_Y) {
    02466         distance = (distance + 1) / 2;
    02467       }
    02468
    02469       params[index++] = distance;
    02470       if (heightdiff != 0) params[index++] = heightdiff;
    02471     }
    02472
    02473     ShowMeasurementTooltips(measure_strings_length[index], index, params);
    02474   }
    02475
    02476   thd->selend.x = x;
    02477   thd->selend.y = y;
    02478   thd->next_drawstyle = b;
    02479 }
    02480
    02487 void VpSelectTilesWithMethod(int x, int y, ViewportPlaceMethod method)
    02488 {
    02489   int sx, sy;
    02490   HighLightStyle style;
    02491
    02492   if (x == -1) {
    02493     _thd.selend.x = -1;
    02494     return;
    02495   }
    02496
    02497   /* Special handling of drag in any (8-way) direction */
    02498   if (method & (VPM_RAILDIRS | VPM_SIGNALDIRS)) {
    02499     _thd.selend.x = x;
    02500     _thd.selend.y = y;
    02501     CalcRaildirsDrawstyle(&_thd, x, y, method);
    02502     return;
    02503   }
    02504
    02505   /* Needed so level-land is placed correctly */
    02506   if (_thd.next_drawstyle == HT_POINT) {
    02507     x += TILE_SIZE / 2;
    02508     y += TILE_SIZE / 2;
    02509   }
    02510
    02511   sx = _thd.selstart.x;
    02512   sy = _thd.selstart.y;
    02513
    02514   switch (method) {
    02515     case VPM_X_OR_Y: // drag in X or Y direction
    02516       if (abs(sy - y) < abs(sx - x)) {
    02517         y = sy;
    02518         style = HT_DIR_X;
    02519       } else {
    02520         x = sx;
    02521         style = HT_DIR_Y;
    02522       }
    02523       goto calc_heightdiff_single_direction;
    02524     case VPM_FIX_X: // drag in Y direction
    02525       x = sx;
    02526       style = HT_DIR_Y;
    02527       goto calc_heightdiff_single_direction;
    02528     case VPM_FIX_Y: // drag in X direction
    02529       y = sy;
    02530       style = HT_DIR_X;
    02531
    02532 calc_heightdiff_single_direction:;
    02533       if (_settings_client.gui.measure_tooltip) {
    02534         TileIndex t0 = TileVirtXY(sx, sy);
    02535         TileIndex t1 = TileVirtXY(x, y);
    02536         uint distance = DistanceManhattan(t0, t1) + 1;
    02537         byte index = 0;
    02538         uint64 params[2];
    02539
    02540         if (distance != 1) {
    02541           /* With current code passing a HT_LINE style to calculate the height
    02542            * difference is enough. However if/when a point-tool is created
    02543            * with this method, function should be called with new_style (below)
    02544            * instead of HT_LINE | style case HT_POINT is handled specially
    02545            * new_style := (_thd.next_drawstyle & HT_RECT) ? HT_LINE | style : _thd.next_drawstyle; */
    02546           int heightdiff = CalcHeightdiff(HT_LINE | style, 0, t0, t1);
    02547
    02548           params[index++] = distance;
    02549           if (heightdiff != 0) params[index++] = heightdiff;
    02550         }
    02551
    02552         ShowMeasurementTooltips(measure_strings_length[index], index, params);
    02553       } break;
    02554
    02555     case VPM_X_AND_Y_LIMITED: { // drag an X by Y constrained rect area
    02556       int limit = (_thd.sizelimit - 1) * TILE_SIZE;
    02557       x = sx + Clamp(x - sx, -limit, limit);
    02558       y = sy + Clamp(y - sy, -limit, limit);
    02559       } // Fallthrough
    02560     case VPM_X_AND_Y: { // drag an X by Y area
    02561       if (_settings_client.gui.measure_tooltip) {
    02562         static const StringID measure_strings_area[] = {
    02563           STR_NULL, STR_NULL, STR_MEASURE_AREA, STR_MEASURE_AREA_HEIGHTDIFF
    02564         };
    02565
    02566         TileIndex t0 = TileVirtXY(sx, sy);
    02567         TileIndex t1 = TileVirtXY(x, y);
    02568         uint dx = Delta(TileX(t0), TileX(t1)) + 1;
    02569         uint dy = Delta(TileY(t0), TileY(t1)) + 1;
    02570         byte index = 0;
    02571         uint64 params[3];
    02572
    02573         /* If dragging an area (eg dynamite tool) and it is actually a single
    02574          * row/column, change the type to 'line' to get proper calculation for height */
    02575         style = (HighLightStyle)_thd.next_drawstyle;
    02576         if (style & HT_RECT) {
    02577           if (dx == 1) {
    02578             style = HT_LINE | HT_DIR_Y;
    02579           } else if (dy == 1) {
    02580             style = HT_LINE | HT_DIR_X;
    02581           }
    02582         }
    02583
    02584         if (dx != 1 || dy != 1) {
    02585           int heightdiff = CalcHeightdiff(style, 0, t0, t1);
    02586
    02587           params[index++] = dx;
    02588           params[index++] = dy;
    02589           if (heightdiff != 0) params[index++] = heightdiff;
    02590         }
    02591
    02592         ShowMeasurementTooltips(measure_strings_area[index], index, params);
    02593       }
    02594     break;
    02595
    02596     }
    02597     default: NOT_REACHED();
    02598   }
    02599
    02600   _thd.selend.x = x;
    02601   _thd.selend.y = y;
    02602 }
    02603
    02608 bool VpHandlePlaceSizingDrag()
    02609 {
    02610   if (_special_mouse_mode != WSM_SIZING) return true;
    02611
    02612   /* stop drag mode if the window has been closed */
    02613   Window *w = FindWindowById(_thd.window_class, _thd.window_number);
    02614   if (w == NULL) {
    02615     ResetObjectToPlace();
    02616     return false;
    02617   }
    02618
    02619   /* while dragging execute the drag procedure of the corresponding window (mostly VpSelectTilesWithMethod() ) */
    02620   if (_left_button_down) {
    02621     w->OnPlaceDrag(_thd.select_method, _thd.select_proc, GetTileBelowCursor());
    02622     return false;
    02623   }
    02624
    02625   /* mouse button released..
    02626    * keep the selected tool, but reset it to the original mode. */
    02627   _special_mouse_mode = WSM_NONE;
    02628   if (_thd.next_drawstyle == HT_RECT) {
    02629     _thd.place_mode = HT_RECT;
    02630   } else if (_thd.select_method & VPM_SIGNALDIRS) {
    02631     _thd.place_mode = HT_RECT;
    02632   } else if (_thd.select_method & VPM_RAILDIRS) {
    02633     _thd.place_mode = (_thd.select_method & ~VPM_RAILDIRS) ? _thd.next_drawstyle : HT_RAIL;
    02634   } else {
    02635     _thd.place_mode = HT_POINT;
    02636   }
    02637   SetTileSelectSize(1, 1);
    02638
    02639   w->OnPlaceMouseUp(_thd.select_method, _thd.select_proc, _thd.selend, TileVirtXY(_thd.selstart.x, _thd.selstart.y), TileVirtXY(_thd.selend.x, _thd.selend.y));
    02640
    02641   return false;
    02642 }
    02643
    02644 void SetObjectToPlaceWnd(CursorID icon, SpriteID pal, HighLightStyle mode, Window *w)
    02645 {
    02646   SetObjectToPlace(icon, pal, mode, w->window_class, w->window_number);
    02647 }
    02648
    02649 #include "table/animcursors.h"
    02650
    02651 void SetObjectToPlace(CursorID icon, SpriteID pal, HighLightStyle mode, WindowClass window_class, WindowNumber window_num)
    02652 {
    02653   /* undo clicking on button and drag & drop */
    02654   if (_thd.place_mode != HT_NONE || _special_mouse_mode == WSM_DRAGDROP) {
    02655     Window *w = FindWindowById(_thd.window_class, _thd.window_number);
    02656     if (w != NULL) {
    02657       /* Call the abort function, but set the window class to something
    02658        * that will never be used to avoid infinite loops. Setting it to
    02659        * the 'next' window class must not be done because recursion into
    02660        * this function might in some cases reset the newly set object to
    02661        * place or not properly reset the original selection. */
    02662       _thd.window_class = WC_INVALID;
    02663       w->OnPlaceObjectAbort();
    02664     }
    02665   }
    02666
    02667   SetTileSelectSize(1, 1);
    02668
    02669   _thd.make_square_red = false;
    02670
    02671   if (mode == HT_DRAG) { // HT_DRAG is for dragdropping trains in the depot window
    02672     mode = HT_NONE;
    02673     _special_mouse_mode = WSM_DRAGDROP;
    02674   } else {
    02675     _special_mouse_mode = WSM_NONE;
    02676   }
    02677
    02678   _thd.place_mode = mode;
    02679   _thd.window_class = window_class;
    02680   _thd.window_number = window_num;
    02681
    02682   if (mode == HT_SPECIAL) // special tools, like tunnels or docks start with presizing mode
    02683     VpStartPreSizing();
    02684
    02685   if ((int)icon < 0) {
    02686     SetAnimatedMouseCursor(_animcursors[~icon]);
    02687   } else {
    02688     SetMouseCursor(icon, pal);
    02689   }
    02690
    02691 }
    02692
    02693 void ResetObjectToPlace()
    02694 {
    02695   SetObjectToPlace(SPR_CURSOR_MOUSE, PAL_NONE, HT_NONE, WC_MAIN_WINDOW, 0);
    02696 }