imagesetpixel
(PHP 3, PHP 4, PHP 5)
imagesetpixel -- Set a single pixel
Description
bool
imagesetpixel ( resource image, int x, int y, int color )
imagesetpixel() draws a pixel at the specified
coordinate.
Return Values
Returns TRUE on success or FALSE on failure.
Examples
Example 1. imagesetpixel() example
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);
?>
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The above example will output
something similar to: 
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