imageopenpolygon

(PHP 7 >= 7.2.0, PHP 8)

imageopenpolygon — Draws an open polygon

說(shuō)明

Signature as of PHP 8.0.0 (not supported with named arguments)

imageopenpolygon(GdImage $image, array $points, int $color): bool

Alternative signature (deprecated as of PHP 8.1.0)

imageopenpolygon(
    GdImage $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.

參數(shù)

image

由圖象創(chuàng)建函數(shù)(例如imagecreatetruecolor())返回的 GdImage 對(duì)象。

points

An array containing the polygon's vertices, e.g.:

points[0] = x0
points[1] = y0
points[2] = x1
points[3] = y1

num_points

Total 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

顏色標(biāo)識(shí)符使用 imagecolorallocate() 創(chuàng)建。

返回值

成功時(shí)返回 true， 或者在失敗時(shí)返回 false。

更新日志

版本 說(shuō)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.

范例

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);
?>

以上例程的輸出類(lèi)似于：

Output of example : imageopenpolygon()

參見(jiàn)