imageantialias
(PHP 4 >= 4.3.2, PHP 5)
imageantialias — Should antialias functions be used or not
Descrizione
$image
, bool $enabled
)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.
Elenco dei parametri
-
image -
Una risorsa immagine, restituita da una delle funzioni di creazione immagine, come imagecreatetruecolor().
-
enabled -
Whether to enable antialiasing or not.
Valori restituiti
Restituisce TRUE in caso di successo, FALSE in caso di fallimento.
Esempi
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);
$normal = imagecreatetruecolor(200, 100);
// Switch antialiasing on for one image
imageantialias($aa, true);
// Allocate colors
$red = imagecolorallocate($normal, 255, 0, 0);
$red_aa = imagecolorallocate($aa, 255, 0, 0);
// Draw two lines, one with AA enabled
imageline($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, $normal, 200, 0, 0, 0, 200, 100, 100);
// Output image
header('Content-type: image/png');
imagepng($aa);
imagedestroy($aa);
imagedestroy($normal);
?>
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