Delete these two nodes before we start drawing the model.

在开始绘制模型之前将这两个结点删除。

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Setting box to True and hover to False makes the control require drawing a box intersecting the line to delete it versus just hovering over it.

将 box 设为 True，将 hover 设为 False，这会让此控件绘制一个与此线交叉的框以删除它，而不是只在其上悬浮。

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Drawing software, MFC implementation, such as graphics move, rotate, select and delete functions.

说明：画图软件，MFC实现，有图形移动、旋转、选取、删除等功能。

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