shift
  fun shiftPointWithMercatorCoordinate(point: Point, shiftMercatorCoordinate: MercatorCoordinate, zoomLevel: Double): Point
Apply a MercatorCoordinate to the original point.
Return
a shift point that applied the shift MercatorCoordinate.
Parameters
point
the point needs to shift.
shift
the shift that applied to the original point.
zoom
the zoom level that apply the calculation.