php man page for imagesetpixel

IMAGESETPIXEL(3)							 1							  IMAGESETPIXEL(3)

imagesetpixel - Set a single pixel

SYNOPSIS
       bool imagesetpixel (resource  $image, int  $x, int  $y, int  $color)

DESCRIPTION
       imagesetpixel(3) draws a pixel at the specified coordinate.

PARAMETERS
	      o $
		image -An image resource, returned by one of the image creation functions, such as imagecreatetruecolor(3).

	      o $x
		- x-coordinate.

	      o $y
		- y-coordinate.

	      o $color
		- A color identifier created with imagecolorallocate(3).

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

EXAMPLES
       Example #1

	      imagesetpixel(3) 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:[NOT DISPLAYABLE MEDIA]Output of example : imagesetpixel()

SEE ALSO
       imagecreatetruecolor(3), imagecolorallocate(3), imagecolorat(3).

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