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15 years ago
That script draws Serpinski's carpet:



<?php

    set_time_limit(5);



    $i = 4;        // Iterations

    $xy = 500;    // Picture size



    $img = imagecreatetruecolor($xy, $xy);



    $white = imagecolorallocate($img, 255, 255, 255);



    drawCarpet(0, 0, $xy, $xy, $i);

    function drawCarpet($a, $b, $c, $d, $n) {

        global $img, $white;



        if($n <= 0) return;



        $a1 = 2 * $a / 3 + $c / 3;

        $c1 = $a / 3 + 2 * $c / 3;

        $b1 = 2 * $b / 3 + $d / 3;

        $d1 = $b / 3 + 2 * $d / 3;

 

        imagefilledrectangle($img, $a1, $b1, $c1, $d1, $white);



        drawCarpet($a, $b, $a1, $b1, $n - 1);

        drawCarpet($a1, $b, $c1, $b1, $n - 1);

        drawCarpet($c1, $b, $c, $b1, $n - 1);



        drawCarpet($c1, $b, $c, $b1, $n - 1);

        drawCarpet($a, $b1, $a1, $d1, $n - 1);

        drawCarpet($c1, $b1, $c, $d1, $n - 1);



        drawCarpet($a, $d1, $a1, $d, $n - 1);

        drawCarpet($a1, $d1, $c1, $d, $n - 1);

        drawCarpet($c1, $d1, $c, $d, $n - 1);

    }



    header('Content-Type: image/png');

    imagepng($img);

?>
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