/**
* Calculate the bounds corresponding to a specific center and zoom level for a give map size in pixels
*
* @param EGMapCoord $center_coord
* @param integer $zoom
* @param integer $width
* @param integer $height
* @return EGMapBounds
* @author fabriceb
* @since Jun 2, 2009 fabriceb
*/
public static function getBoundsFromCenterAndZoom(EGMapCoord $center_coord, $zoom, $width, $height = null)
{
if (is_null($height)) {
$height = $width;
}
$center_lat = $center_coord->getLatitude();
$center_lng = $center_coord->getLongitude();
$pix = EGMapCoord::fromLatToPix($center_lat, $zoom);
$ne_lat = EGMapCoord::fromPixToLat($pix - round(($height - 1) / 2), $zoom);
$sw_lat = EGMapCoord::fromPixToLat($pix + round(($height - 1) / 2), $zoom);
$pix = EGMapCoord::fromLngToPix($center_lng, $zoom);
$sw_lng = EGMapCoord::fromPixToLng($pix - round(($width - 1) / 2), $zoom);
$ne_lng = EGMapCoord::fromPixToLng($pix + round(($width - 1) / 2), $zoom);
return new EGMapBounds(new EGMapCoord($sw_lat, $sw_lng), new EGMapCoord($ne_lat, $ne_lng));
}
