code: def getInnerEdgePoints(self):
          
          result = []
          result.append((float(self.get_x()) + float(self.get_rx()), float(self.get_y()) + float(self.get_ry())))
          result.append((float(self.get_x()) + float(self.get_width()) - float(self.get_rx()), float(self.get_y()) + float(self.get_ry())))
          result.append((float(self.get_x()) + float(self.get_width()) - float(self.get_rx()), float(self.get_y()) + float(self.get_height()) - float(self.get_ry())))
          result.append((float(self.get_x()) + float(self.get_rx()), float(self.get_y()) + float(self.get_height()) - float(self.get_ry())))
          return result
docs: Returns a list with the coordinates of the points at the inner edge of a rounded rectangle as tuples.
          e.g.[(x1,y1),(x2,y2)]
          The sorting is counterclockwise starting with the lower left corner.
          Coordinates must be numbers or an exception will be thrown.