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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.

Parameters

image

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

x

x-coordinate

y

y-coordinate

color

A color identifier created with imagecolorallocate()

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);

?>

The above example will output something similar to:

See Also

imagecreatetruecolor()
imagecolorallocate()

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