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That parameter is mostly useless in practise, and likely has been directly ported from the underlying `gdImagePolygon()` and friends, which require that parameter since the number of elements of the point array would otherwise be unknown. Typical usages of `imagepolygon()`, `imageopenpolygon()` and `imagefilledpolygon()` pass `count($points)/2` or hard-code this value as literal. Since explicitly specifying this parameter is annoying and error-prone, we offer the possibility to omit it, in which case the `$points` array must have an even number of elements, and the number of points is calculated as `count($points)/2`.
28 lines
889 B
PHP
28 lines
889 B
PHP
--TEST--
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imageopenpolygon(): basic test
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--SKIPIF--
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<?php
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if (!extension_loaded('gd')) die('skip gd extension not available');
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?>
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--FILE--
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<?php
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require_once __DIR__ . DIRECTORY_SEPARATOR . 'func.inc';
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$im = imagecreatetruecolor(100, 100);
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$white = imagecolorallocate($im, 255, 255, 255);
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$black = imagecolorallocate($im, 0, 0, 0);
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$red = imagecolorallocate($im, 255, 0, 0);
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$green = imagecolorallocate($im, 0, 128, 0);
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$blue = imagecolorallocate($im, 0, 0, 255);
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imagefilledrectangle($im, 0,0, 99,99, $white);
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imageopenpolygon($im, [10,10, 49,89, 89,10], $black);
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imageopenpolygon($im, [10,89, 35,10, 60,89, 85,10], $red);
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imageopenpolygon($im, [10,49, 30,89, 50,10, 70,89, 90,10], $green);
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imageopenpolygon($im, [10,50, 25,10, 40,89, 55,10, 80,89, 90,50], $blue);
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test_image_equals_file(__DIR__ . DIRECTORY_SEPARATOR . 'imageopenpolygon.png', $im);
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?>
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--EXPECT--
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The images are equal.
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