Php/docs/function.imageopenpolygon
imageopenpolygon
(PHP 7 >= 7.2.0)
imageopenpolygon — Draws an open polygon
说明
imageopenpolygon
( resource $image
, array $points
, int $num_points
, int $color
) : bool
imageopenpolygon() draws an open polygon on the given
image. Contrary to imagepolygon(),
no line is drawn between the last and the first point.
参数
image由图象创建函数(例如imagecreatetruecolor())返回的图象资源。
pointsAn array containing the polygon's vertices, e.g.:
points[0] = x0 points[1] = y0 points[2] = x1 points[3] = y1 num_pointsTotal number of points (vertices), which must be at least 3.
color颜色标识符使用 imagecolorallocate() 创建。
返回值
成功时返回 true， 或者在失败时返回 false。
范例
Example #1 imageopenpolygon() example
<?php// Create a blank image$image = imagecreatetruecolor(400, 300);// Allocate a color for the polygon$col_poly = imagecolorallocate($image, 255, 255, 255);// Draw the polygonimageopenpolygon($image, array( 0, 0, 100, 200, 300, 200 ), 3, $col_poly);// Output the picture to the browserheader('Content-type: image/png');imagepng($image);imagedestroy($image);?>
以上例程的输出类似于：
