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| <?php
$width = 400;
$height = 300;
$data = array ();
for ($i = 0; $i < 500; $i++) {
$data[] = sin(deg2rad(($i / 500) * 360));
}
$xstart = $width / 10;
$ystart = $height - ($height / 10);
$image = imagecreate($width, $height);
$back = imagecolorallocate($image, 255, 255, 255);
$border = imagecolorallocate($image, 64, 64, 64);
imageline($image, $xstart, 0, $xstart, $ystart, $border);
imageline($image, $xstart, $ystart, $width, $ystart, $border);
imagestring($image, 2, $xstart -20, $ystart -10, "1", $border);
imagestring($image, 2, $xstart -20, 0, "-1", $border);
imagestring($image, 2, $xstart, $ystart +5, "0", $border);
imagestring($image, 2, $width -20, $ystart +5, "360", $border);
$datatop = 1;
$databottom = -1;
$oldx = 0;
$oldy = 0;
$datacount = count($data);
$xscale = ($width - $xstart) / $datacount;
$yscale = $ystart / ($datatop - $databottom);
$midline = $ystart / 2;
for ($i = 0; $i < $datacount; $i++) {
$x = $xstart + ($i * $xscale);
$y = $midline - ($data[$i] * $yscale);
if ($i > 0) {
imageline($image, $oldx, $oldy, $x, $y, $border);
}
$oldx = $x;
$oldy = $y;
}
header("Content-type: image/png");
imagepng($image);
imagedestroy($image);
?> |
