imagesetpixel

(PHP 4, PHP 5, PHP 7)

Set a single pixel

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-coordinate.

y-coordinate.

color

A color identifier created with imagecolorallocate().

Returns:

Returns TRUE on success or FALSE on failure.

Examples:

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: