# File ../lib/fox/core.rb, line 63
    def +(other)
      if other.kind_of?(FXPoint)
        FXPoint.new(self.x + other.x, self.y + other.y)
      elsif other.kind_of?(FXSize)
        FXPoint.new(self.x + other.w, self.y + other.h)
      else
        raise TypeError, 'expected FXPoint or FXSize'
      end
    end