(PHP 7 >= 7.2.0, PHP 8)
imageopenpolygon — Draws an open polygon
Signature as of PHP 8.0.0 (not supported with named arguments)
Alternative signature (deprecated as of PHP 8.1.0)
imageopenpolygon() draws an open polygon on the given
image. Contrary to imagepolygon(),
no line is drawn between the last and the first point.
image由图象创建函数(例如imagecreatetruecolor())返回的 GdImage 对象。
pointsAn array containing the polygon's vertices, e.g.:
| points[0] | = x0 |
| points[1] | = y0 |
| points[2] | = x1 |
| points[3] | = y1 |
num_pointsTotal number of points (vertices), which must be at least 3.
If this parameter is omitted as per the second signature,points
must have an even number of elements, and num_points is
assumed to be count($points)/2.
color颜色标识符使用 imagecolorallocate() 创建。
成功时返回 true， 或者在失败时返回 false。
| 版本 | 说明 |
|---|---|
| 8.1.0 |
The parameter num_points has been deprecated.
|
| 8.0.0 |
image expects a GdImage
instance now; previously, a resource was expected.
|
示例 #1 imageopenpolygon() example
<?php
// Create a blank image
$image = imagecreatetruecolor(400, 300);
// Allocate a color for the polygon
$col_poly = imagecolorallocate($image, 255, 255, 255);
// Draw the polygon
imageopenpolygon($image, array(
0, 0,
100, 200,
300, 200
),
3,
$col_poly);
// Output the picture to the browser
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>
以上例程的输出类似于：
