Creating implementation for idiom 179 : Get center of a rectangle

Idiom

# 179 Get center of a rectangle

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Return the center _c of the rectangle with coördinates(_x1,_y1,_x2,_y2)

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c := CenterPoint(Rect(x1,y1,x2,y2));

Point = Struct.new(:x, :y)

Rect  = Struct.new(:x1, :y1, :x2, :y2) do
  def center  
    Point.new((x1+x2)/2.0, (y1+y2)/2.0)
  end
end

c = Rect.new(0,0,2,5).center

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