How to draw a filled polygon using an imagefilledpolygon() function in PHP?

imagefilledpolygon() is an inbuilt PHP function that is used to draw a filled polygon.

Syntax

bool imagefilledpolygon($image, $points, $num_points, $color)

Parameters

imagefilledpolygon() takes four different parameters − $image, $points, $num_points, and $color.

• $image − Creates a blank image in a given size using the imagecreatetruecolor() function.

• $points − Holds the sequential vertices of the polygon.

• $num_points − Contains the total number of vertices in a polygon. The total number of points/vertices must be at least three to create a polygon.

• $color − Contains the filled color identifier using imagecolorallocate() function.

Return Values

It returns True on success and False on failure.

Example 1

<?php
   // set up array of points for a polygon
   $values = array(
      40, 50, // Point 1 (x, y)
      20, 240, // Point 2 (x, y)
      60, 60, // Point 3 (x, y)
      240, 20, // Point 4 (x, y)
      50, 40, // Point 5 (x, y)
      10, 10 // Point 6 (x, y)
   );
   // create the image using imagecreatetruecolor function
   $img = imagecreatetruecolor(700, 350);

   // allocated the blue and gray colors
   $bg = imagecolorallocate($img, 122, 122, 122);
   $blue = imagecolorallocate($img, 0, 0, 255);

   // filled the background
   imagefilledrectangle($img, 0, 0, 350, 350, $bg);

   // draw a polygon
   imagefilledpolygon($img, $values, 6, $blue);

   // flush image
   header('Content-type: image/png');
   imagepng($img);
   imagedestroy($img);
?>

Output

Example 2

<?php
   // Set the vertices of the 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 creates the size of the image or blank image.
   $img = imagecreatetruecolor(700, 350);

   // Set the gray background image color
   $bg = imagecolorallocate($img, 122, 122, 122);

   // Set the red image color
   $red = imagecolorallocate($img, 255, 0, 0);

   // fill the background
   imagefilledrectangle($img, 0, 0, 350, 350, $bg);

   // Draw the polygon image
   imagefilledpolygon($img, $values, 5, $red);

   // Output of the image.
   header('Content-type: image/png');
   imagepng($img);
   imagedestroy($img);
?>

Output