/**
* Calculates the average color of an image.
*
* @param ImageResource $aResource
*
* @return IColor
*/
public static function average(ImageResource $aResource)
{
$w = $aResource->getX();
$h = $aResource->getY();
$r = $g = $b = 0;
$res = $aResource->getResource();
for ($y = 0; $y < $h; $y++) {
for ($x = 0; $x < $w; $x++) {
$rgb = imagecolorat($res, $x, $y);
$r += $rgb >> 16;
$g += $rgb >> 8 & 255;
$b += $rgb & 255;
}
}
$pxls = $w * $h;
$r = dechex(round($r / $pxls));
$g = dechex(round($g / $pxls));
$b = dechex(round($b / $pxls));
if (strlen($r) < 2) {
$r = 0 . $r;
}
if (strlen($g) < 2) {
$g = 0 . $g;
}
if (strlen($b) < 2) {
$b = 0 . $b;
}
$index = Color::createColorIndex($r, $g, $b);
return new Color($index);
}
/**
* Check
*/
public function testCreateColorIndexNoAlpah()
{
$this->assertEquals("16777215", Color::createColorIndex(255, 255, 255));
}
