/**
* Reformat the photo's id into a fixed width string that can be sorted.
*
* @param object Phlickr_Photo $photo
* @return string
*/
function stringFromPhoto(Phlickr_Photo $photo)
{
return sprintf('%012d', $photo->getId());
}
/**
* Return a sortable string of the photos average color.
*
* Steps:
* - Resample the image to single pixel.
* - Convert the pixel's RGB value to an HSV value,
* - Convert the HSV to a string.
*
* @param object Phlickr_Photo $photo
* @return string or false in case of error.
*/
public function stringFromPhoto(Phlickr_Photo $photo)
{
// cache the RGB value so that multiple color sort strategies can
// share the average color.
$key = 'avg_color:' . $photo->getId();
if ($this->_cache->has($key)) {
$rgb = $this->_cache->get($key);
} else {
$url = $photo->buildImgUrl(Phlickr_Photo::SIZE_100PX);
if ($rgb = self::getAverageRgbColor($url)) {
// add the average color to the cache and mark it as
// non-expiring because the photo can't be changed.
$this->_cache->set($key, $rgb, -1);
} else {
// if there's an error getting the average value don't add it
// to the cache, just bail.
return false;
}
}
$hsv = self::HsvFromRgb($rgb);
return sprintf("%02d,%02d,%02d", round($hsv[0] / 30), round($hsv[1] * 10), round($hsv[2] * 10));
}
