Then define a function which computes the area for the rectangle object.

然后定义一个函数来计算Rectangle的面积。

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Call this member function repeatedly to redraw a drag rectangle.

反复调用该成员函数以重新绘制一个拖动的矩形。

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Call this member function repeatedly to redraw a drag rectangle.

反复调用该成员函数以重新绘制一个拖动的矩形。

youdao