code: public static double getLongitudeFromPixel(long width,
  			BoundingBox boundingBox, BoundingBox tileBoundingBox, float pixel) {
  
  		double boxWidth = tileBoundingBox.getMaxLongitude()
  				- tileBoundingBox.getMinLongitude();
  		double percentage = pixel / width;
  		double offset = percentage * boxWidth;
  		double longitude = offset + boundingBox.getMinLongitude();
  
  		return longitude;
  	}
docs: Get the longitude from the pixel location, bounding box, tile bounding
  box (when different from bounding box), and image width
  
  @param width
  width
  @param boundingBox
  bounding box
  @param tileBoundingBox
  tile bounding box
  @param pixel
  pixel
  @return longitude
  @since 3.2.0