<?php
$im = imageCreateTrueColor(500,500);
$white = imageColorAllocate($im,255,255,255);
$c = imageColorAllocate($im,120,120,120);
imageline($im,250,0,250,500,$c);
imageline($im,0,250,500,250,$c);
$n = 30;
$x = -10;
for($i=0;$x<2000;$i++){
$y = cos($x);
$y1 = -1*($n*$y);
$x1 = $n*$x;
$x +=0.01;
$y2 = -1*($n*$y);
$x2 = $n*$x;
imageline($im,$x1+250,$y1+250,$x2+251,$y2+251,$white);
}
header("content-type: image/png");
imagePng($im);
imageDestroy($im);
?>
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