PHP imagepolygon() function

Description

imagepolygon() creates a polygon in the given image.

Syntax

PHP imagepolygon() function has the following syntax.

Parameter

PHP imagepolygon() function has the following parameters.

• image - An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
• points - An array containing the polygon's vertices.
• num_points - Total number of points (vertices).
• color - A color identifier created with imagecolorallocate().

Point Format

Take a look at the following code:

$myPoints = array( 20, 20, 
                   185, 55, 
                   70, 80 ); 
imagepolygon( $myImage, $myPoints, 3, $myBlack );  

This example creates an array of the polygon's points, called $myPoints. There are six elements in the array, or three x/y coordinate pairs.

This means that there are three corners to this polygon: at (20,20), (185,55), and (70,80).

Return

Returns TRUE on success or FALSE on failure.

Example

<?php/*  w w w. j  a  va  2 s . c o  m*/
// Create a blank image
$image = imagecreatetruecolor(400, 300);

// Allocate a color for the polygon
$col_poly = imagecolorallocate($image, 255, 255, 255);

// Draw the polygon
imagepolygon($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);
?>