protected function ellipseRadialGradient(awGradient $gradient, $x1, $y1, $x2, $y2)
{
if ($y1 - $y2 > 0) {
if ($y1 - $y2 != $x2 - $x1) {
awImage::drawError("Class GDGradientDriver: Radial gradients are only implemented on circle, not ellipses.");
}
$c = new awPoint($x1 + ($x2 - $x1) / 2, $y1 + ($y2 - $y1) / 2);
$r = ($x2 - $x1) / 2;
$ok = array();
// Init gradient
$this->init($gradient, $r);
for ($i = 0; $i <= $r; $i += 0.45) {
$p = ceil(2 * M_PI * $i);
if ($p > 0) {
$interval = 360 / $p;
} else {
$interval = 360;
}
$color = $this->color($i);
for ($j = 0; $j < 360; $j += $interval) {
$rad = $j / 360 * (2 * M_PI);
$x = round($i * cos($rad));
$y = round($i * sin($rad));
$l = sqrt($x * $x + $y * $y);
if ($l <= $r) {
if (array_key_exists((int) $x, $ok) === FALSE or array_key_exists((int) $y, $ok[$x]) === FALSE) {
// Print the point
$this->driver->point($color, new awPoint($c->x + $x, $c->y + $y));
$ok[(int) $x][(int) $y] = TRUE;
}
}
}
unset($color);
}
}
}
