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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`.
79 lines
1.4 KiB
PHP
79 lines
1.4 KiB
PHP
--TEST--
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imagepolygon()
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--SKIPIF--
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<?php
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if (!function_exists('imagepolygon')) die('skip imagepolygon() not available');
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?>
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--FILE--
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<?php
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/* Prototype : bool imagepolygon ( resource $image , array $points , int $num_points , int $color )
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* Description: Draws a polygon.
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* Source code: ext/gd/gd.c
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* Alias to functions:
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*/
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echo "Simple test of imagepolygon() function\n";
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$dest = dirname(realpath(__FILE__)) . '/imagepolygon.png';
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// create a blank image
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$image = imagecreatetruecolor(400, 300);
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// set the background color to black
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$bg = imagecolorallocate($image, 0, 0, 0);
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// draw a red polygon
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$col_poly = imagecolorallocate($image, 255, 0, 0);
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// draw the polygon
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imagepolygon($image, array (
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0, 0,
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100, 200,
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300, 200
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),
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$col_poly);
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// output the picture to a file
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imagepng($image, $dest);
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$col1 = imagecolorat($image, 100, 200);
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$col2 = imagecolorat($image, 100, 100);
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$color1 = imagecolorsforindex($image, $col1);
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$color2 = imagecolorsforindex($image, $col2);
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var_dump($color1, $color2);
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imagedestroy($image);
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echo "Done\n";
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?>
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--CLEAN--
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<?php
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$dest = dirname(realpath(__FILE__)) . '/imagepolygon.png';
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@unlink($dest);
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?>
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--EXPECT--
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Simple test of imagepolygon() function
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array(4) {
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["red"]=>
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int(255)
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["green"]=>
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int(0)
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["blue"]=>
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int(0)
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["alpha"]=>
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int(0)
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}
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array(4) {
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["red"]=>
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int(0)
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["green"]=>
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int(0)
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["blue"]=>
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int(0)
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["alpha"]=>
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int(0)
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}
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Done
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