/**
* Takes samples from the given GD at 5 pixel increments
* @param GD $gd The source image
* @param integer $horizontal Number of samples to take horizontally
* @param integer $vertical Number of samples to take vertically
* @return array List of colours for each sample, each given as an associative
* array with red, blue, green, and alpha components
*/
protected function sampleAreas(GD $gd, $horizontal = 4, $vertical = 4)
{
$samples = array();
for ($y = 0; $y < $vertical; $y++) {
for ($x = 0; $x < $horizontal; $x++) {
$colour = imagecolorat($gd->getImageResource(), $x * 5, $y * 5);
$samples[] = ImageColorsforIndex($gd->getImageResource(), $colour);
}
}
return $samples;
}
