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Made by Chao Xu (WebDevLogs.com)
You need a prime counting function, it can be finded here :
http://www.weberdev.com/get_example-4635.html
| <?php
$size = 500;
$prime = esprime($size*$size);
$image = imagecreate($size,$size);
imagecolorallocate($image,255,255,255);
$color = imagecolorallocate($image,0,0,0);
$size2=$size/2;
$n = 2;$t = true;$sn=4;
$midu=2;$midl=4;$midd=6;$midr=8;
$i = 0;
while($n<$size){
if($prime[$i]<=$sn){
$p = $prime[$i++];
if($t){//even
if($p <= $sn-$n){
$x = $n/2;
$y = $midu - $p;
}else{
$x = $midl -$p;
$y = -$n/2;
}
}else{//odd
if($p <= $sn-$n){
$x = (-$n/2)+0.5;
$y = $p - $midd;
}else{
$x = $p - $midr;
$y = ($n/2)-0.5;
}
}
imagesetpixel($image,$x+$size2,$y+$size2,$color);
}else{
++$n;
$sn = $n * $n;
$t = !$t;
if($t){
$midu = $sn-$n*1.5+1;
$midl = $sn-$n*0.5+1;
}else{
$midd = $sn-$n*1.5+1.5;
$midr = $sn-$n*0.5+0.5;
}
}
}
header("Content-type: image/png");
imagepng($image);
?> | |
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