OCC笔记：选择TopoDS_Shape顶点、边、面等等

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1、通过AIS_InteractiveContext的函数访问当前选择的图形

hAISContext->InitSelected();
hAISContext->MoreSelected();
hAISContext->NextSelected()；
hAISContext->SelectedShape()；

其中hAISContext->SelectedShape()通过StdSelect_BrepOwner来获取TopoDS_Shape，具体的参看源码即可

2、示例

• 绘制一个box，并激活box的顶点、边、面的选择模式

  	//create box for testBRepPrimAPI_MakeBox mkBox(gp_Pnt(0, 0, 0), 10, 20, 30);TopoDS_Shape aShpae = mkBox.Shape();Handle(AIS_Shape) hBoxShape = new AIS_Shape(aShpae);myAISContext->Display(hBoxShape, Standard_True);myAISContext->Deactivate(hBoxShape);myAISContext->Activate(hBoxShape, AIS_Shape::SelectionMode(TopAbs_FACE));myAISContext->Activate(hBoxShape, AIS_Shape::SelectionMode(TopAbs_EDGE));myAISContext->Activate(hBoxShape, AIS_Shape::SelectionMode(TopAbs_VERTEX));
  

• 选择的处理

  void COCTView::OnBtnTestSelect()
  {auto hAISContext = GetDocument()->GetAISContext();if (!hAISContext){return;}for (hAISContext->InitSelected(); hAISContext->MoreSelected();hAISContext->NextSelected()){TopoDS_Shape aShape = hAISContext->SelectedShape();if (aShape.IsNull()) continue;switch (aShape.ShapeType()){case TopAbs_ShapeEnum::TopAbs_VERTEX:{TopoDS_Vertex aVertex = TopoDS::Vertex(aShape);AfxMessageBox(_T("选中一个点"));break;}case TopAbs_ShapeEnum::TopAbs_EDGE:{AfxMessageBox(_T("选中一条边"));break;}case TopAbs_ShapeEnum::TopAbs_FACE:{AfxMessageBox(_T("选中一个面"));break;}//其他略}}
  }
  

3、演示

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