Hi. I using GD package to make wave. But it does not work. 
use GD::Simple;
$i = GD::Simple->new(400,400);
($x1,$y1) = (0,0);
for ($x2=0; $x2<=400; $x2+=10) {
    $y2 = sin($x2)*400;
    $i->moveTo($x1,$y1);
    $i->lineTo($x2,$y2);
    ($x1,$y1) = ($x2,$y2);
}
print $i->png;
How do I get right value for y2? Thank.

In reply to Make sin wave with GD by Anonymous Monk

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