imagesetpixel
(PHP 4, PHP 5, PHP 7, PHP 8)
imagesetpixel — 设置单个像素
参数
-
image 由图象创建函数(例如imagecreatetruecolor())返回的 GdImage 对象。
x-
x 坐标。
y-
y 坐标。
color-
颜色标识符使用 imagecolorallocate() 创建。
示例
示例 #1 imagesetpixel() 示例
A random drawing that ends with a regular picture.
<?php
$x = 200;
$y = 200;
$gd = imagecreatetruecolor($x, $y);
$corners[0] = array('x' => 100, 'y' => 10);
$corners[1] = array('x' => 0, 'y' => 190);
$corners[2] = array('x' => 200, 'y' => 190);
$red = imagecolorallocate($gd, 255, 0, 0);
for ($i = 0; $i < 100000; $i++) {
imagesetpixel($gd, round($x), round($y), $red);
$a = rand(0, 2);
$x = ($x + $corners[$a]['x']) / 2;
$y = ($y + $corners[$a]['y']) / 2;
}
header('Content-Type: image/png');
imagepng($gd);
?>以上示例的输出类似于：
参见
- imagecreatetruecolor() - 新建真彩色图像
- imagecolorallocate() - 为图像分配颜色
- imagecolorat() - 取得某像素的颜色索引值
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