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PHP GD alpha
Posted on: November 3, 2009 at 12:00 AM
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This example shows how to display images with the help of function imagecolorallocatealpha()in php gd.

<?php

$size = 300;

$image=imagecreatetruecolor($size, $size);

$back = imagecolorallocate($image, 255, 255, 255);

$border = imagecolorallocate($image, 0, 0, 0);

imagefilledrectangle($image, 0, 0, $size - 1, $size - 1, $back);

imagerectangle($image, 0, 0, $size - 1, $size - 1, $border);

$yellow_x = 100;

$yellow_y = 75;

$red_x = 120;

$red_y = 165;

$blue_x = 187;

$blue_y = 125;

$radius = 150;

$yellow = imagecolorallocatealpha($image, 255, 255, 0, 75);

$red = imagecolorallocatealpha($image, 255, 0, 0, 75);

$blue = imagecolorallocatealpha($image, 0, 0, 255, 75);

imagefilledellipse($image, $yellow_x, $yellow_y, $radius, $radius, $yellow);

imagefilledellipse($image, $red_x, $red_y, $radius, $radius, $red);

imagefilledellipse($image, $blue_x, $blue_y, $radius, $radius, $blue);

header('Content-type: image/jpeg');

imagejpeg($image);

imagedestroy($image);

?>

After running the program you will get the following output

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Posted on: November 3, 2009

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