Data commit

Task/Mandelbrot-set/PHP/mandelbrot-set.php

@@ -0,0 +1,39 @@
+$min_x=-2;
+$max_x=1;
+$min_y=-1;
+$max_y=1;
+
+$dim_x=400;
+$dim_y=300;
+
+$im = @imagecreate($dim_x, $dim_y)
+  or die("Cannot Initialize new GD image stream");
+header("Content-Type: image/png");
+$black_color = imagecolorallocate($im, 0, 0, 0);
+$white_color = imagecolorallocate($im, 255, 255, 255);
+
+for($y=0;$y<=$dim_y;$y++) {
+  for($x=0;$x<=$dim_x;$x++) {
+    $c1=$min_x+($max_x-$min_x)/$dim_x*$x;
+    $c2=$min_y+($max_y-$min_y)/$dim_y*$y;
+
+    $z1=0;
+    $z2=0;
+
+    for($i=0;$i<100;$i++) {
+      $new1=$z1*$z1-$z2*$z2+$c1;
+      $new2=2*$z1*$z2+$c2;
+      $z1=$new1;
+      $z2=$new2;
+      if($z1*$z1+$z2*$z2>=4) {
+        break;
+      }
+    }
+    if($i<100) {
+      imagesetpixel ($im, $x, $y, $white_color);
+    }
+  }
+}
+
+imagepng($im);
+imagedestroy($im);