# elrail_data.h File Reference

Stores all the data for overhead wire and pylon drawing. More...

Go to the source code of this file.

## Data Structures
struct | SortableSpriteStruct
## Defines
#define | PCP_NOT_ON_TRACK 0xFF
#define | NUM_IGNORE_GROUPS 3
#define | IGNORE_NONE 0xFF
## Enumerations
enum | TLG { XEVEN_YEVEN = 0, XEVEN_YODD = 1, XODD_YEVEN = 2, XODD_YODD = 3, TLG_END }
| Tile Location group. More...
enum | TileSource { TS_HOME = 0, TS_NEIGHBOUR = 1, TS_END }
| When determining the pylon configuration on the edge, two tiles are taken into account: the tile being drawn itself (the home tile, the one in ti->tile), and the neighbouring tile.
enum | { NUM_TRACKS_AT_PCP = 6 }
enum | PylonSpriteOffset { PSO_Y_NE, PSO_Y_SW, PSO_X_NW, PSO_X_SE, PSO_EW_N, PSO_EW_S, PSO_NS_W, PSO_NS_E }
| Offset for pylon sprites from the base pylon sprite.
enum | WireSpriteOffset { WSO_X_SHORT, WSO_Y_SHORT, WSO_EW_SHORT, WSO_NS_SHORT, WSO_X_SHORT_DOWN, WSO_Y_SHORT_UP, WSO_X_SHORT_UP, WSO_Y_SHORT_DOWN, WSO_X_SW, WSO_Y_SE, WSO_EW_E, WSO_NS_S, WSO_X_SW_DOWN, WSO_Y_SE_UP, WSO_X_SW_UP, WSO_Y_SE_DOWN, WSO_X_NE, WSO_Y_NW, WSO_EW_W, WSO_NS_N, WSO_X_NE_DOWN, WSO_Y_NW_UP, WSO_X_NE_UP, WSO_Y_NW_DOWN, WSO_ENTRANCE_NE, WSO_ENTRANCE_SE, WSO_ENTRANCE_SW, WSO_ENTRANCE_NW }
| Offset for wire sprites from the base wire sprite.
enum | { ELRAIL_ELEVATION = 10, ELRAIL_ELEVRAISE = ELRAIL_ELEVATION + TILE_HEIGHT }
enum | CatenarySprite { WIRE_X_FLAT_SW, WIRE_X_FLAT_NE, WIRE_X_FLAT_BOTH, WIRE_X_UP_SW, WIRE_X_UP_NE, WIRE_X_UP_BOTH, WIRE_X_DOWN_SW, WIRE_X_DOWN_NE, WIRE_X_DOWN_BOTH, WIRE_Y_FLAT_SE, WIRE_Y_FLAT_NW, WIRE_Y_FLAT_BOTH, WIRE_Y_UP_SE, WIRE_Y_UP_NW, WIRE_Y_UP_BOTH, WIRE_Y_DOWN_SE, WIRE_Y_DOWN_NW, WIRE_Y_DOWN_BOTH, WIRE_NS_W_BOTH, WIRE_NS_E_BOTH, WIRE_NS_W_N, WIRE_NS_E_N, WIRE_NS_W_S, WIRE_NS_E_S, WIRE_EW_N_BOTH, WIRE_EW_S_BOTH, WIRE_EW_N_W, WIRE_EW_S_W, WIRE_EW_N_E, WIRE_EW_S_E, INVALID_CATENARY = 0xFF }
| Refers to a certain element of the catenary. More...
## Variables
static byte | AllowedPPPonPCP [DIAGDIR_END]
| Which PPPs are possible at all on a given PCP.
static byte | OwnedPPPonPCP [DIAGDIR_END]
| Which of the PPPs are inside the tile.
static const DiagDirection | PCPpositions [TRACK_END][2]
| Maps a track bit onto two PCP positions.
static byte | PreferredPPPofTrackAtPCP [TRACK_END][DIAGDIR_END]
| Preferred points of each trackbit.
static byte | IgnoredPCP [NUM_IGNORE_GROUPS][TLG_END][DIAGDIR_END]
| In case we have a staight line, we place pylon only every two tiles, so there are certain tiles which we ignore.
static byte | DisallowedPPPofTrackAtPCP [TRACK_END][DIAGDIR_END]
| Which pylons can definately NOT be built.
static const Track | TracksAtPCP [DIAGDIR_END][NUM_TRACKS_AT_PCP]
static const TileSource | TrackSourceTile [DIAGDIR_END][NUM_TRACKS_AT_PCP]
static const Direction | PPPorder [DIAGDIR_END][TLG_END][DIR_END]
static const int8 | x_pcp_offsets [DIAGDIR_END] = {0, 8, 16, 8}
static const int8 | y_pcp_offsets [DIAGDIR_END] = {8, 16, 8, 0}
static const int8 | x_ppp_offsets [DIR_END] = {-2, -4, -2, 0, 2, 4, 2, 0}
static const int8 | y_ppp_offsets [DIR_END] = {-2, 0, 2, 4, 2, 0, -2, -4}
static const uint8 | pylon_sprites []
static const SortableSpriteStruct | CatenarySpriteData []
static const SortableSpriteStruct | CatenarySpriteData_Depot []
static const SortableSpriteStruct | CatenarySpriteData_Tunnel []
static const CatenarySprite | Wires [5][TRACK_END][4]

## Detailed Description

Stores all the data for overhead wire and pylon drawing.

See also:
  elrail.c

Definition in file elrail_data.h.

## Enumeration Type Documentation

anonymous enum

Enumerator:

  ELRAIL_ELEVATION | Distance between wire and rail.
  ELRAIL_ELEVRAISE | Wires that a draw one level higher than the north corner.

Definition at line 312 of file elrail_data.h.

enum CatenarySprite

Refers to a certain element of the catenary.

Identifiers for Wires:

1. Direction of the wire
2. Slope of the tile for diagonals, placement inside the track for horiz/vertical pieces
3. Place where a pylon shoule be

Identifiers for Pylons:

1. Direction of the wire
2. Slope of the tile
3. Position of the Pylon relative to the track
4. Position of the Pylon inside the tile

Definition at line 406 of file elrail_data.h.

enum TLG

Tile Location group.

This defines whether the X and or Y coordinate of a tile is even

Definition at line 11 of file elrail_data.h.

## Variable Documentation

byte AllowedPPPonPCP[DIAGDIR_END]`[static]`

Initial value:

     {
      1 << DIR_N | 1 << DIR_E  | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W  | 1 << DIR_NW,
      1 << DIR_N | 1 << DIR_NE | 1 << DIR_E  | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
      1 << DIR_N | 1 << DIR_E  | 1 << DIR_SE | 1 << DIR_S | 1 << DIR_W  | 1 << DIR_NW,
      1 << DIR_N | 1 << DIR_NE | 1 << DIR_E  | 1 << DIR_S | 1 << DIR_SW | 1 << DIR_W,
    }

Which PPPs are possible at all on a given PCP.

Definition at line 34 of file elrail_data.h.

Referenced by DrawCatenaryRailway().

const SortableSpriteStruct CatenarySpriteData_Depot[]`[static]`

Initial value:

     {
      { WSO_ENTRANCE_NE,   0,  7, 15,  1,  1, ELRAIL_ELEVATION },
      { WSO_ENTRANCE_SE,   7,  0,  1, 15,  1, ELRAIL_ELEVATION },
      { WSO_ENTRANCE_SW,   0,  7, 15,  1,  1, ELRAIL_ELEVATION },
      { WSO_ENTRANCE_NW,   7,  0,  1, 15,  1, ELRAIL_ELEVATION }
    }

Definition at line 380 of file elrail_data.h.

const SortableSpriteStruct CatenarySpriteData_Tunnel[]`[static]`

Initial value:

     {
      { WSO_ENTRANCE_NE,   0,  7, 15,  1,  1, ELRAIL_ELEVATION },
      { WSO_ENTRANCE_SE,   7,  0,  1, 15,  1, ELRAIL_ELEVATION },
      { WSO_ENTRANCE_SW,   0,  7, 15,  1,  1, ELRAIL_ELEVATION },
      { WSO_ENTRANCE_NW,   7,  0,  1, 15,  1, ELRAIL_ELEVATION }
    }

Definition at line 387 of file elrail_data.h.

byte DisallowedPPPofTrackAtPCP[TRACK_END][DIAGDIR_END]`[static]`

Initial value:

     {
      {1 << DIR_SW | 1 << DIR_NE, 0,           1 << DIR_SW | 1 << DIR_NE, 0          },
      {0,           1 << DIR_NW | 1 << DIR_SE, 0,           1 << DIR_NW | 1 << DIR_SE},
      {1 << DIR_W | 1 << DIR_E,  0,           0,           1 << DIR_W | 1 << DIR_E },
      {0,           1 << DIR_W | 1 << DIR_E,  1 << DIR_W | 1 << DIR_E,  0          },
      {0,           0,           1 << DIR_S | 1 << DIR_N,  1 << DIR_N | 1 << DIR_S },
      {1 << DIR_S | 1 << DIR_N,  1 << DIR_S | 1 << DIR_N,  0,           0,         },
    }

Which pylons can definately NOT be built.

Definition at line 182 of file elrail_data.h.

Referenced by DrawCatenaryRailway().

byte IgnoredPCP[NUM_IGNORE_GROUPS][TLG_END][DIAGDIR_END]`[static]`

In case we have a staight line, we place pylon only every two tiles, so there are certain tiles which we ignore.

A straight line is found if we have exactly two PPPs.

Definition at line 107 of file elrail_data.h.

Referenced by DrawCatenaryRailway().

byte OwnedPPPonPCP[DIAGDIR_END]`[static]`

Initial value:

     {
      1 << DIR_SE | 1 << DIR_S  | 1 << DIR_SW | 1 << DIR_W,
      1 << DIR_N  | 1 << DIR_SW | 1 << DIR_W  | 1 << DIR_NW,
      1 << DIR_N  | 1 << DIR_NE | 1 << DIR_E  | 1 << DIR_NW,
      1 << DIR_NE | 1 << DIR_E  | 1 << DIR_SE | 1 << DIR_S
    }

Which of the PPPs are inside the tile.

For the two PPPs on the tile border the following system is used: if you rotate the PCP so that it is in the north, the eastern PPP belongs to the tile.

Definition at line 44 of file elrail_data.h.

Referenced by DrawCatenaryRailway().

const DiagDirection PCPpositions[TRACK_END][2]`[static]`

Initial value:

     {
      {DIAGDIR_NE, DIAGDIR_SW},
      {DIAGDIR_SE, DIAGDIR_NW},
      {DIAGDIR_NW, DIAGDIR_NE},
      {DIAGDIR_SE, DIAGDIR_SW},
      {DIAGDIR_SW, DIAGDIR_NW},
      {DIAGDIR_NE, DIAGDIR_SE},
    }

Maps a track bit onto two PCP positions.

Definition at line 52 of file elrail_data.h.

Referenced by DrawCatenaryRailway().

const Direction PPPorder[DIAGDIR_END][TLG_END][DIR_END]`[static]`

Initial value:

     {
      {
        {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_N, DIR_E, DIR_S, DIR_W},
        {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_S, DIR_W, DIR_N, DIR_E},
        {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_S, DIR_W, DIR_N, DIR_E},
        {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_N, DIR_E, DIR_S, DIR_W},
      }, {
        {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_S, DIR_E, DIR_N, DIR_W},
        {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_N, DIR_W, DIR_S, DIR_E},
        {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_N, DIR_W, DIR_S, DIR_E},
        {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_S, DIR_E, DIR_N, DIR_W},
      }, {
        {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_S, DIR_W, DIR_N, DIR_E},
        {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_N, DIR_E, DIR_S, DIR_W},
        {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_N, DIR_E, DIR_S, DIR_W},
        {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_S, DIR_W, DIR_N, DIR_E},
      }, {
        {DIR_NE, DIR_NW, DIR_SE, DIR_SW, DIR_N, DIR_W, DIR_S, DIR_E},
        {DIR_NE, DIR_SE, DIR_SW, DIR_NW, DIR_S, DIR_E, DIR_N, DIR_W},
        {DIR_SW, DIR_NW, DIR_NE, DIR_SE, DIR_S, DIR_E, DIR_N, DIR_W},
        {DIR_SW, DIR_SE, DIR_NE, DIR_NW, DIR_N, DIR_W, DIR_S, DIR_E},
      }
    }

Definition at line 209 of file elrail_data.h.

byte PreferredPPPofTrackAtPCP[TRACK_END][DIAGDIR_END]`[static]`

Preferred points of each trackbit.

Those are the ones perpendicular to the track, plus the point in extension of the track (to mark end-of-track). PCPs which are not on either end of the track are fully preferred.

See also:
  PCPpositions

Definition at line 66 of file elrail_data.h.

Referenced by DrawCatenaryRailway().

const uint8 pylon_sprites[]`[static]`

Initial value:

     {
      PSO_EW_N,
      PSO_Y_NE,
      PSO_NS_E,
      PSO_X_SE,
      PSO_EW_S,
      PSO_Y_SW,
      PSO_NS_W,
      PSO_X_NW,
    }

Definition at line 254 of file elrail_data.h.

const Track TracksAtPCP[DIAGDIR_END][NUM_TRACKS_AT_PCP]`[static]`

Initial value:

     {
      {TRACK_X, TRACK_X, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
      {TRACK_Y, TRACK_Y, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
      {TRACK_X, TRACK_X, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
      {TRACK_Y, TRACK_Y, TRACK_UPPER, TRACK_LOWER, TRACK_LEFT, TRACK_RIGHT},
    }

Definition at line 192 of file elrail_data.h.

const TileSource TrackSourceTile[DIAGDIR_END][NUM_TRACKS_AT_PCP]`[static]`

Initial value:

     {
      {TS_HOME, TS_NEIGHBOUR, TS_HOME     , TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME     },
      {TS_HOME, TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME     , TS_NEIGHBOUR, TS_HOME     },
      {TS_HOME, TS_NEIGHBOUR, TS_NEIGHBOUR, TS_HOME     , TS_HOME     , TS_NEIGHBOUR},
      {TS_HOME, TS_NEIGHBOUR, TS_HOME     , TS_NEIGHBOUR, TS_HOME     , TS_NEIGHBOUR},
    }

Definition at line 201 of file elrail_data.h.