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。
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。
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。
The drawing software lets the user expediently add, delete, move and modify fire detection or fire fighting facilities on the building floor maps.
其制图部分使用户可以方便地对楼层图上各种消防设施和房间标志进行添加、删除、移动、修改及尺寸变换；
You delete the last one drawing a line command, the last line disappear, then directly draw a circle, so it will produce another style of graphics.
您删除了最后一条画线指令，此时最后一条线消失，便直接画圆，于是便会产出另一种样式的图形。
You delete the last one drawing a line command, the last line disappear, then directly draw a circle, so it will produce another style of graphics.
您删除了最后一条画线指令，此时最后一条线消失，便直接画圆，于是便会产出另一种样式的图形。
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