<?php

$width = 800;
$height = 600;

$maxPoints = 50000;
$p1 = 77;
$p2 = 89;
$p3 = 100;

$x = 0;
$y = 0;

$gd = imagecreatetruecolor($width, $height);


for ($i = 0; $i < $maxPoints; $i++)
{
    $p = rand(0, 100);
    $xt = $x;
    
    if($p < $p1)
    {
        $x = .85 * $x + .04 * $y + .075;
        $y = -.04 * $xt + .85 * $y + .18;
    }
    else if($p < $p2)
    {
        $x = .20 * $x - .26 * $y + .04;
        $y = .23 * $xt + .22 * $y + .045;
    }
    else if($p < $p3)
    {
        $x = -.15 * $x + .28 * $y + .575;
        $y = .26 * $xt + .24 * $y - .086;
    }
    else
    {
        $x = .5;
        $y = .16 * $y;
    }
    
    if($i > 100 && $x > 0 && $y > 0)
    {
        $color = imagecolorallocate($gd, ($x*255)%255, ($y*255)%255, ($x*$y*255)%255); 
        imagesetpixel($gd, round($x*$width),round($y*$height), $color);
    }
}
 
header('Content-Type: image/png');
imagepng($gd);

?>