The imagepolygon() function is an inbuilt function in PHP which is used to draw a polygon. This function returns TRUE on success and returns FALSE otherwise.
Syntax:
bool imagepolygon( $image, $points, $num_points, $color )
Parameters: This function accepts four parameters as mentioned above and described below:
- $image: The imagecreatetruecolor() function is used to create a blank image in a given size.
- $points: This parameter is used to hold the consecutive vertices of polygon.
- $num_points: This parameter contains total number of vertices in a polygon. It must be greater than 3, because minimum three vertices required to create a polygon.
- $color: This variable contains the filled color identifier. A color identifier created with imagecolorallocate() function.
Return Value: This function returns TRUE on success or FALSE on failure.
Below programs illustrate the imagepolygon() function in PHP.
Program 1:
php
<?php // Set the vertices of polygon $values = array (
150, 50, // Point 1 (x, y)
50, 250, // Point 2 (x, y)
250, 250 // Point 3 (x, y)
);
// Create the size of image or blank image $image = imagecreatetruecolor(300, 300);
// Set the background color of image $background_color = imagecolorallocate( $image , 0, 153, 0);
// Fill background with above selected color imagefill( $image , 0, 0, $background_color );
// Allocate a color for the polygon $image_color = imagecolorallocate( $image , 255, 255, 255);
// Draw the polygon imagepolygon( $image , $values , 3, $image_color );
// Output the picture to the browser header( 'Content-type: image/png' );
imagepng( $image );
?> |
Output:
Program 2:
php
<?php // Set the vertices of polygon $values = array (
150, 50, // Point 1 (x, y)
55, 119, // Point 2 (x, y)
91, 231, // Point 3 (x, y)
209, 231, // Point 4 (x, y)
245, 119 // Point 5 (x, y)
);
// Create the size of image or blank image $image = imagecreatetruecolor(300, 300);
// Set the background color of image $background_color = imagecolorallocate( $image , 0, 153, 0);
// Fill background with above selected color imagefill( $image , 0, 0, $background_color );
// Allocate a color for the polygon $col_poly = imagecolorallocate( $image , 255, 255, 255);
// Draw the polygon imagepolygon( $image , $values , 5, $col_poly );
// Output the picture to the browser header( 'Content-type: image/png' );
imagepng( $image );
?> |
Output:
Related Articles:
- PHP | imagefilledpolygon() Function
- PHP | imageellipse() Function
- PHP | imagefilledellipse() Function
Reference: http://php.net/manual/en/function.imagepolygon.php
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