Aaron Yendall . Spirograph

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So, I wanted to create artwork with nothing but code. Wild hair, I guess. Anyways, my kids were playin with a spirograph kit and I thought it would be cool to make PHP generate a spirograph on-the-fly. And ofcours, not being a fan of reinventing the wheel, I googled it and came across phpgd.com, a PHP library used to generate images. And as fate would have it, Chris Neale had a spirograph generation script in the art pages. Well, it only generated one spirograph and I wanted more :) So I took his script to the next level by adding random color and random coordinates to generate a unique image on page refresh. Have a look.

$image = imagecreatetruecolor(1600,1600);
$white = imagecolorallocate($image,0,0,0);
$black = imagecolorallocate($image,rand(0,255),rand(0,255),rand(0,255));
imagefill($image,rand(0,250),0,$white);

//User settings
$cog_a=rand(-1,10);
$cog_b=rand(2,12);
$i=250;

//Other stuff
$xoffset = 400;
$yoffset = 400;
$ra=$i;
$rb=400-$i;
$xi=$x1=(($ra*cos($cog_a))+($rb*cos($cog_b)));
$yi=$y1=(($ra*sin($cog_a))+($rb*sin($cog_b)));
$ta=$cog_a;
$tb=$cog_b;

do {

    $c++;

    $x2=$x1;
    $y2=$y1;
    $cog_a+=$ta;
    $cog_b+=$tb;
    $x1=(($ra*cos($cog_a))+($rb*cos($cog_b)));
    $y1=(($ra*sin($cog_a))+($rb*sin($cog_b)));

    imageline($image,$x1+$xoffset,$y1+$yoffset,$x2+$xoffset,$y2+$yoffset,$black);

} while (!((abs($x1-$xi)<2)&&(abs($yi-$y1)<2)));

$out = imagecreatetruecolor(300,300);
imagecopyresampled($out,$image,0,0,0,0,600,600,1600,1600);

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

Have fun.
Aaron Yendall

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