imagesetpixel
(PHP 4, PHP 5, PHP 7)
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() - Create a new true color image
- imagecolorallocate() - Allocate a color for an image
- imagecolorat() - Get the index of the color of a pixel