PHP | imageopenpolygon() Function
Last Updated :
31 Jan, 2020
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
<?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);
?>
Example 2: In this example, drawing polygon on a image.
php
<?php
// Create an image instance
$image = imagecreatefrompng(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-13.png');
// 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);
?>
Reference: https://www.php.net/manual/en/function.imageopenpolygon.php