Another option here is to embed a map that you can extend by setting place markers and drawing lines.
这里有另外一个选项就是将地图嵌入进来，你可以在地图上标记为支点以及画线条。
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。
The design of auto-body forming process commonly includes edge un-wrapping, choice of drawing direction, roughcast reckoning, design of addendum, adding the binder surface and setting the draw bead.
覆盖件拉延工艺的设计一般包括以下内容：翻边展开、拉深方向选择、坯料估算、工艺补充面的搭建、压料面的添加以及拉深筋的布置等等。
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