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<?php
<? php
( 0 );
//This line was added to avoide the huge amount of notices this script creates
error_reporting ( E_ALL ^ E_NOTICE );
//Very fast Diffusion-Limited Aggregation
$s = 100 ;
$step = 700 ;
$area = 2 ; //smaller = faster, larger = more accurate(random)
$image = imagecreate ( $s , $s );
imagecolorallocate ( $image , 255 , 255 , 255 );
$color = imagecolorallocate ( $image , 0 , 0 , 0 );
$s2 = $s / 2 ;
$grid [ $s2 ][ $s2 ] = 1 ;
imagesetpixel ( $image , $s2 , $s2 , $color );
$i < $step ){
//calculate releasing area
$n = max ( $max_x - $min_x , $max_y - $min_y ) + $area ;
$s2mn = $s2 - $n ;
$s2an = $s2 + $n ;
//release a molecule
do{
$x = rand ( $s2mn , $s2an );
$y = rand ( $s2mn , $s2an );
$grid [ $x ][ $y ]);
//move the molecule randomly
while(!( $grid [ $x - 1 ][ $y - 1 ]+ $grid [ $x - 1 ][ $y ]+ $grid [ $x - 1 ][ $y + 1 ]+
$grid [ $x ][ $y - 1 ]+ $grid [ $x ][ $y + 1 ]+ $grid [ $x + 1 ][ $y - 1 ]+
$grid [ $x + 1 ][ $y ]+ $grid [ $x + 1 ][ $y + 1 ])){
$x += rand (- 1 , 1 );
$y += rand (- 1 , 1 );
$x < $s2mn || $x > $s2an || $y < $s2mn || $y > $s2an ){
2 ;
$grid [ $x ][ $y ] = 1 ;
$max_x < $x ){
$max_x = $x ;
$min_x > $x ){
$min_x = $x ;
$max_y < $y ){
$max_y = $y ;
$min_y > $y ){
$min_y = $y ;
imagesetpixel ( $image , $x , $y , $color );
$i ;
header ( "Content-type: image/png" );
imagepng ( $image );
?>
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Alix Axel wrote : 1795
This is a nice function indeed the only drawback is the speed.
