# ImagickDraw::setStrokeAlpha

(PECL imagick 2, PECL imagick 3)

ImagickDraw::setStrokeAlpha — Specifies the opacity of stroked object outlines

### 说明

public ImagickDraw::setStrokeAlpha(float `$alpha`): bool
警告

本函数还未编写文档，仅有参数列表。

Specifies the opacity of stroked object outlines.

### 参数

`alpha`

  opacity

### 返回值

没有返回值。

### 示例

示例 #1 ImagickDraw::setStrokeAlpha() example

`<?php
function setStrokeAlpha($strokeColor, $fillColor, $backgroundColor) {
$draw = new \ImagickDraw();
$draw->setStrokeColor($strokeColor);
$draw->setFillColor($fillColor);
$draw->setStrokeWidth(4);
$draw->line(100, 100, 400, 145);
$draw->rectangle(100, 200, 225, 350);
$draw->setStrokeOpacity(0.1);
$draw->line(100, 120, 400, 165);
$draw->rectangle(275, 200, 400, 350);
$image = new \Imagick();
$image->newImage(500, 400, $backgroundColor);
$image->setImageFormat("png");
$image->drawImage($draw);
header("Content-Type: image/png");
echo $image->getImageBlob();
}
?>`
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