The imageopenpolygon() function is an inbuilt function in PHP which is used to draws an open polygon.
Syntax:
bool imageopenpolygon( resource $image, array $points, int $num_points, int $color )
Parameters: This function accepts four parameters as mentioned above and described below:
- $image: It specifies the image resource to work on.
- $points: It specifies the points of polygon.
- $num_points: It specifies the number of points.
- $color: It specifies the color of polygon.
Return Value: This function returns TRUE on success or FALSE on failure.
Below examples illustrate the imageopenpolygon() function in PHP:
Example 1: In this example, we will draw polygon on a blank drawing.
<?php   // Create a blank image $image = imagecreatetruecolor(400, 300);   // Prepare the colors $red = imagecolorallocate($image, 255, 0, 0);   // Points of array $points = array(     80, 150,     150, 250,     300, 250,     370, 150,     230, 50,     80, 150 );   // Create an polygon imageopenpolygon($image, $points, 6, $red);   // Output to browser header('Content-type: image/png'); imagepng($image); imagedestroy($image); ?> |
Output:
Example 2: In this example, drawing polygon on a image.
<?php   // Create an image instance $image = imagecreatefrompng(   // Prepare the colors $red = imagecolorallocate($image, 255, 0, 0);   // Points of array $points = array(     10, 10,     660, 10,     660, 100,     10, 100,     10, 10 );   // Create an polygon imageopenpolygon($image, $points, 5, $red);   // Output to browser header('Content-type: image/png'); imagepng($image); imagedestroy($image); ?> |
Output:
Reference: https://www.php.net/manual/en/function.imageopenpolygon.php
