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imageantialias

(PHP 4 >= 4.3.2, PHP 5, PHP 7, PHP 8)

imageantialias — Should antialias functions be used or not

Опис

imageantialias(GdImage $image, bool $enable): 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.

Параметри

image

Об'єкт GdImage, що повертається однією з функцій створення зображення, такою як imagecreatetruecolor().

enable

Whether to enable antialiasing or not.

Значення, що повертаються

Повертає true у разі успіху або false в разі помилки.

Журнал змін

Версія Опис
8.0.0 Тепер image має бути примірником GdImage. Раніше очікувався gd-resource.
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.

Приклади

Приклад #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);
?>

Поданий вище приклад виведе щось схоже на:

Output of example : A comparison of two lines, one with anti-aliasing switched on

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