<?php
// mandelbrot generation class v1.0
// (c) copyright 2006 positive blue <info@positiveblue.com>
// some rights reserved
class Mandelbrot
{
// thats where all step coordinates are stored
public $coArray = array();
public $maxiter = 256;
// picture width and height
public $width = 800;
public $height = 600;
// palette and colors
public $palette = array();
public $colors = 64; // number of colors
public $set_colors = false;
// steps config
private $steps;
// this function loads coordinates from the file
public function loadConfigFile($filename)
{
if (file_exists($filename))
{
$co = file($filename);
// loop through each line and add coordinates
foreach ($co as $n => $line)
{
// explode
if (!empty($line))
$this->coArray[] = explode(" ", trim($line));
}
$this->steps = count($this->coArray);
return $this->steps;
} else {
// could not load file
return false;
}
}
// prepare image object
private function initImage()
{
return imagecreatetruecolor($this->width, $this->height);
}
// this allocates palette in image object
private function createPalette($img)
{
for ($i = 0; $i != $this->colors; $i++)
{
if (is_array($this->set_colors))
{
eval('$c1 = $i' . $this->set_colors[0] . ';');
eval('$c2 = $i' . $this->set_colors[1] . ';');
eval('$c3 = $i' . $this->set_colors[2] . ';');
} else {
$c1 = $i * 5;
$c2 = $i + 3;
$c3 = $i + 6;
}
$c1 = $c1 > 255 ? 255 : $c1; $c1 = $c1 < 1 ? 1 : $c1;
$c2 = $c2 > 255 ? 255 : $c2; $c2 = $c2 < 1 ? 1 : $c2;
$c3 = $c3 > 255 ? 255 : $c3; $c3 = $c3 < 1 ? 1 : $c3;
$this->palette[$i] = imagecolorallocate($img, round($c1), round($c2), round($c3));
$this->palette[($this->maxiter / 2 + 1) - $i] = $this->palette[$i];
}
return $palette;
}
// this function draws a step
public function doStep($pic, $step = 0)
{
// set our vars
$xmin = (float) $this->coArray[$step][0];
$xmax = (float) $this->coArray[$step][1];
$ymin = (float) $this->coArray[$step][2];
$ymax = (float) $this->coArray[$step][3];
$dx = ($xmax - $xmin) / $this->width;
$dy = ($ymax - $ymin) / $this->height;
$py = 0;
$y = $ymin;
while ($py < $this->height)
{
$px = 0;
$x = $xmin;
$py++;
while ($px < $this->width)
{
$px++;
$fx = 0;
$fy = 0;
$m = 0;
while ((($fx * $fx + $fy * $fy) < 4) && ($m < $this->maxiter))
{
$old_x = $fx;
$fx = ($fx * $fx) - ($fy * $fy) + $x;
$fy = 2 * $old_x * $fy + $y;
$m++;
}
$color = ($m == $this->maxiter + 1) ? 0 : $this->palette[$m % ($this->maxiter / 2 + 1)];
imagesetpixel($pic, $px, $py, $color);
$x += $dx;
}
$y += $dy;
}
}
public function run($output_dir = '.')
{
for($i = 0; $i < count($this->coArray); $i++)
{
$img = $this->initImage();
$this->createPalette(& $img);
$this->doStep(& $img, $i);
imagepng($img, $output_dir . '/img' . ($i + 1) . ".png");
}
}
}
?>
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