PHP | imagefilledpolygon() Function

The imagefilledpolygon() function is an inbuilt function in PHP which is used to draw a filled polygon. This function Returns TRUE on success and returns FALSE otherwise.

Syntax:

bool imagefilledpolygon( $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 polgon. It must be greater then 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 imagefilledpolygon() function in PHP.

Program 1:

<?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) 
        ); 
   
// It create the size of image or blank image. 
$image = imagecreatetruecolor(300, 300); 
   
// Set image background color 
$bg   = imagecolorallocate($image, 255, 255, 255); 
  
// Set image color 
$gr = imagecolorallocate($image, 0, 153, 0); 
   
// fill the background 
imagefilledrectangle($image, 0, 0, 300, 300, $bg); 
   
// Draw the polygon 
imagefilledpolygon($image, $values, 3, $gr); 
   
// Output of the image. 
header('Content-type: image/png'); 
imagepng($image); 
?> 

Output:
Imagefilledcolor function

Program 2:

<?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) 
            ); 
   
// It create the size of image or blank image. 
$image = imagecreatetruecolor(300, 300); 
   
// Set image background color 
$bg   = imagecolorallocate($image, 255, 255, 255); 
  
// Set image color 
$blue = imagecolorallocate($image, 0, 153, 0); 
   
// fill the background 
imagefilledrectangle($image, 0, 0, 300, 300, $bg); 
   
// Draw the polygon 
imagefilledpolygon($image, $values, 5, $blue); 
   
// Output of the image. 
header('Content-type: image/png'); 
imagepng($image); 
imagedestroy($image); 
?> 

Output:
imagefilledcolor

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Reference: http://php.net/manual/en/function.imagefilledpolygon.php

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