function getcolorat($x, $y, $dist)
{
global $radius;
$x_ = $x - $radius;
$y_ = $y - $radius;
// always use atan2, returns up to 360 degs
$h = atan2($x_, $y_);
$h /= 2 * pi();
$s = 1;
$l = $dist / $radius;
$c = Color::fromHSL($h, $s, $l);
return $c;
}
}
?>
<p>
<code><strong>Varying Lightness</strong> // Hue = 2/3, Saturation = 1.0</code>
</p>
<?php
$s = 1;
$h = 2 / 3.0;
for ($i = 0; $i <= 100; $i++) {
$l = $i / 100.0;
$hex = Color::fromHSL($h, $s, $l)->toHexString();
echo "<b style='background:{$hex}'></b>";
}
?>
<br />
<?php
for ($i = 0; $i <= 100; $i++) {
$s = 1;
$h = 2 / 3.0;
$l = $i / 100.0;
$hex = Color::fromHSL($h, $s, $l)->toHexString();
$rgb = Color::fromHexString($hex);
list($h, $s, $l) = $rgb->toHSL();
Color::fromHSL($h, $s, $l)->toHexString();
echo "<b style='background:{$hex}'></b>";
}
?>
</body>
