Php/docs/function.imageantialias
imageantialias
(PHP 4 >= 4.3.2, PHP 5, PHP 7)
imageantialias — Should antialias functions be used or not
Description
imageantialias
( resource $image
, bool $enabled
) : bool
Activate the fast drawing antialiased methods for lines and wired polygons. It does not support alpha components. It works using a direct blend operation. It works only with truecolor images.
Thickness and styled are not supported.
Using antialiased primitives with transparent background color can end with some unexpected results. The blend method uses the background color as any other colors. The lack of alpha component support does not allow an alpha based antialiasing method.
Parameters
image- An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
enabled- Whether to enable antialiasing or not.
Return Values
Returns TRUE on success or FALSE on failure.
Changelog
| Version | Description |
|---|---|
| 7.2.0 | imageantialias() is now generally available. Formerly
it was only available if PHP was compiled with the bundled version of the GD library. |
Examples
Example #1 A comparison of two lines, one with anti-aliasing switched on
<?php// Setup an anti-aliased image and a normal image$aa = imagecreatetruecolor(400, 100);$normal = imagecreatetruecolor(200, 100);// Switch antialiasing on for one imageimageantialias($aa, true);// Allocate colors$red = imagecolorallocate($normal, 255, 0, 0);$red_aa = imagecolorallocate($aa, 255, 0, 0);// Draw two lines, one with AA enabledimageline($normal, 0, 0, 200, 100, $red);imageline($aa, 0, 0, 200, 100, $red_aa);// Merge the two images side by side for output (AA: left, Normal: Right)imagecopymerge($aa, $normal, 200, 0, 0, 0, 200, 100, 100);// Output imageheader('Content-type: image/png');imagepng($aa);imagedestroy($aa);imagedestroy($normal);?>
The above example will output something similar to:
