function ellipseRadialGradient($gradient, $x1, $y1, $x2, $y2) {
if($y1 - $y2 > 0) {
if($y1 - $y2 != $x2 - $x1) {
trigger_error("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
$this->drawer->point($color, new awPoint($c->x + $x, $c->y + $y));
$ok[(int)$x][(int)$y] = TRUE;
}
}
}
$color->free();
unset($color);
}
}
}
