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PHP Randomised Image Generator

See the demonstration over at PHP Random Coloured Lines V.1 and PHP Random Coloured Lines V.2 the only difference between the two is the "COLOR_DEVIATION" value. Refresh the page for a new image.

I'm not sure exactly where I got the base code from, my thanks go to the original author, I think it may have been via PHP4 Multimedia Programming published by Wrok.


//seed random generator
srand((double)microtime()*1000000);

define("IMAGE_WIDTH",715);
define("IMAGE_HEIGHT",300);
define("MAX_LINE_WIDTH",10);
define("COLOR_DEVIATION",18);

// create an image resource
$img = imagecreate(IMAGE_WIDTH,IMAGE_HEIGHT);

// start at middle grey...
$lr = $lg = $lb = 127;

function cmax($x) {
// make sure our color value is a sane number
if ($x > 255) { return 255; }
elseif ($x < 0) { return 0; }
else { return $x; } }

function ncolor($x) {
return rand($x - COLOR_DEVIATION, $x + COLOR_DEVIATION); }

// draw vertical fills
while($p < IMAGE_WIDTH) {
$linecolor = imagecolorallocate($img,
$cr = cmax(ncolor($lr)),
$cg = cmax(ncolor($lg)),
$cb = cmax(ncolor($lb)));
$linewidth = rand(1,MAX_LINE_WIDTH);
imagefilledrectangle($img,$p,0,$p+$linewidth,IMAGE_HEIGHT,$linecolor);
$p = $p + $linewidth;
$lr = $cr;
$lg = $cg;
$lb = $cb;
}

// return the image to the client
header("Content-type:image/png");
imagepng($img);

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