/*<?php

$image_width = 300;
$image_height = 300;

// create a blank image
$image = imagecreatetruecolor($image_width, $image_height);

// fill the background color
$bg = imagecolorallocate($image, 255, 255, 255);
imagefilledrectangle($image,0,0,$image_width,$image_height,$bg);

// choose a color for the ellipse
$col_ellipse = imagecolorallocate($image, 0, 0, 0);



// draw the white ellipse
imagefilledellipse($image, 200, 150, 10, 10, $col_ellipse);

// output the picture
header("Content-type: image/png");
imagepng($image);

?> */

<?php
// create a blank image
$image = imagecreatetruecolor(400, 300);

// fill the background color
$bg = imagecolorallocate($image, 0, 0, 0);

// choose 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
header("Content-type: image/png");
imagepng($image);

?>