imageopenpolygon

(PHP 7 >= 7.2.0)

imageopenpolygonDraws an open polygon

说明

bool imageopenpolygon ( resource $image , array $points , int $num_points , int $color )

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。

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).

color

A color identifier created with imagecolorallocate().

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(400300);

// Allocate a color for the polygon
$col_poly imagecolorallocate($image255255255);

// Draw the polygon
imageopenpolygon($image, array(
        
0,   0,
        
100200,
        
300200
    
),
    
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:

Output of example : imageopenpolygon()

参见

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