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imagesetpixel

Description

The imagesetpixel of Image for PHP set a single pixel.

Syntax

imagesetpixel(
    GdImage $image,
    int $x,
    int $y,
    int $color
): bool

Parameters

image

A GdImage object, 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

Returns true on success or false on failure.

Examples

1 · return

<?

$width = 100;
$height = 100;
$image = imagecreate($width, $height);

$red = 255;
$green = 255;
$blue = 255;
$color = imagecolorallocate($image, $red, $green, $blue);

$x = 0;
$y = 0;

$return = imagesetpixel($image, $x, $y, $color);

var_export($return);

true

2 · base64

<?

$width = 100;
$height = 100;
$image = imagecreatetruecolor($width, $height);

$red = 255;
$green = 255;
$blue = 255;
$color = imagecolorallocate($image, $red, $green, $blue);

$x = 50;
$y = 50;
imagesetpixel($image, $x, $y, $color);

ob_start();

    imagepng($image);

$output = ob_get_clean();

echo '<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,' . base64_encode($output) . '">
</body>
</html>';

<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAIAAAD/gAIDAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAO0lEQVR4nO3OMQEAAAgDoPUvPUN4eAgJSAAAAAAAAAAAAAAAAAAA4JG21wUAAAAAAAAAAAAAAAAAAHYGZzAC/so5nyEAAAAASUVORK5CYII=">
</body>
</html>

3 · base64 · random

<?

$width = 100;
$height = 100;
$image = imagecreatetruecolor($width, $height);

$red = 255;
$green = 255;
$blue = 255;
$color = imagecolorallocate($image, $red, $green, $blue);

for($i = 0; $i < 1000; ++$i)
{
    $x = rand(0, $width);
    $y = rand(0, $height);
    imagesetpixel($image, $x, $y, $color);
}

ob_start();

    imagepng($image);

$output = ob_get_clean();

echo '<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,' . base64_encode($output) . '">
</body>
</html>';

<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAIAAAD/gAIDAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAE5ElEQVR4nN1X3cLkKgib93/pnovdM9uvCoYkaHe9mrEIyE+In+u6Prd1Xdd35/4bXFX5s+uXt+0+R2ZKhjkvN+ej15xSmLStZEfXeVpR23rACHGqdyVmWj3gWr6jGD3rC21c6ogaIUzc8Xccd6p26fxGE9H9I/2o3U1DFF6Pmro7Fv1GtIECmTzRxnly1NT5VulqZffew32MOmlVRBVvWopnU3mlwMfZ8vvHu2Lmru4SrkHgdbaPSqmu+nCAWD165D1EFG9eOnk//hKzj6aLU9ZjpIJmVknYbqUCeJsoDSVOgMJNXeUtejPtuPPTSfSg9SlHmNuK6MRB4iHCwQ0SPi7EuA/zY2AO9UxG1/PSEVy+NhBFY0YNBCrfo4zXr795z+PrsJACVAVKRY6vg2NrWURll4x3KCH0hraNooM/Ayeb1WGxrUZc46Jl4e+s5OB9hxheZ0mTpJw7HD33ROoUKVkGmr6FqMH5Un3PO2ETS8DBsqRfQau31FEuOc4aS8aMtfxQEqUnM0GwW9q/1vW4SEeqoAMvnd/AsoxXqNamcjQFE19/yhFOIDz1l9ZOE3TsiEbVRgcF3Zd15d3bzcIjrhvpJN4P6NlT9fwIwegG7cl7gSUHSOX1k1s5w2/oh5XlRYZUUCsNTPRDM3HDA3W5v6Qp1WdKSWF4pPtJTJOs11HiJNv72UDHqwVxJukktBO3+VrdBxtQjPg6AkaiZETlKgdUOCOqerl5/1rFV1ysJMlpzjnd+mpNN+kT/sjA+gjc/S8UI7DKEDHvkGUweKU8j86PfVc/5yXtVd6qsJv6FtYYRHyQKdxYh78/O+tGvZ0hgt16n+v/letMbqekAfWS27Sbnn5doE/H6qsIeobQBAUPNL+myA3WfCJDVD73STzyQ0yPaHV8eAflntXusEh8+qwj/Uj6sOSBfdCehw9hdgppaqkmWmmEcS7Sz+m8gzJ6youmiKHqfUC1kWZzQxCzVpxKjeSw4gb0KeHxCklZgt0OBiToVJuRAM7qlOGmEhfZ8qk++sNxbjof3hWGhU7LWAVIiylV1s3FQrGOwZfA31Q4qiPvA2OJKoWpVXXR0rlLR5dUMzmLW49sFc7vXNxMjGJdImKFRUycvHONfU1kWx8FjXE8yCQji72mReatHHnUDsEYEKNO5tGXChB6ETGku0tlTo8F1ACvzqe/hDhb0SAqY5Ei7odtRMxChsoOjfKnGMnWldxWvH8CGXqGLc0o+fBoyYhec8BJX4/ovk1ljk/i8VT+aRliHRltMeqecbgJ8YZRfL8lX3LjKTzu4kP9X8X7Y+55J0NSHfaxoJ4nbq5Atf7ivQeX0zbZLwVVL43pThWtXGT4jZhQYhUdtwLRObNCuEXk3Ji9aU/RL03Vj+pOxxFOxnUqPIizj76nD7KWxd7hQ7klu80rOH0Sm8fXn1HzPfn44GuaiVE/mbFvWzLzmywpCPeu/J4t1M3UUuQfB8864fykUOUqyecdkS5YxoXLZKRB0aPb7T+pKccTlgu/boEdhDcpZ0hcHuVLzkJ0HAGxoHxiSBmyC/kpZNhz66UCFvce8S00Ox3y6cEo3MgIswci+WqswQUMVRvHW61jfBVCk2uGzht5rcIVjZ9EYVVX8oJR0XT1FcRWNRwi3E4ZkDFFmyHMo0VpQ6JMaG1LSaU4/gN/d/Ccob7DsQAAAABJRU5ErkJggg==">
</body>
</html>