Open CASCADE学习|选取模型的点、线和面

目录

1、上下文初始化设置

2、定义选择函数

3、添加鼠标事件

4、显示模型后输入选择函数

实现鼠标左键点选模型的点、线、面并高亮显示，实现过程如下：

1、上下文初始化设置

//交互式上下文
context = new AIS_InteractiveContext(viewer);
context->SetDisplayMode(AIS_Shaded, Standard_True);
//高亮颜色和模式
context->HighlightStyle(Prs3d_TypeOfHighlight_LocalDynamic)->SetColor(Quantity_NameOfColor::Quantity_NOC_RED);
context->HighlightStyle(Prs3d_TypeOfHighlight_LocalDynamic)->SetMethod(Aspect_TOHM_COLOR);
context->HighlightStyle(Prs3d_TypeOfHighlight_LocalDynamic)->SetDisplayMode(1);
context->HighlightStyle(Prs3d_TypeOfHighlight_LocalDynamic)->SetTransparency(0.5f);
​

2、定义选择函数

void Displaywin::selectMode(Handle(AIS_Shape) selectmode)
{
    //激活将形状分解为Any
    context->Deactivate();
    const int aSubShapeSelMode = AIS_Shape::SelectionMode(TopAbs_FACE);
    context->Activate(selectmode, aSubShapeSelMode);
    context->Activate(selectmode, AIS_Shape::SelectionMode(TopAbs_SOLID));
    context->Activate(selectmode, AIS_Shape::SelectionMode(TopAbs_VERTEX));
    context->Activate(selectmode, AIS_Shape::SelectionMode(TopAbs_EDGE));
}
​

3、添加鼠标事件

void Displaywin::mousePressEvent(QMouseEvent* event)
{
    //平移 鼠标右键+shift
    if ((event->buttons() & Qt::RightButton))//&& (QApplication::keyboardModifiers() == Qt::ShiftModifier))
    {
        m_mode = Action3d_Panning;
        m_x = event->pos().x();
        m_y = event->pos().y();
    }
    else if (event->buttons() & Qt::LeftButton)//选择
    {
        context->MoveTo(event->pos().x(), event->pos().y(), view, true);
    }
    else if (event->buttons() & Qt::MidButton)//旋转
    {
        m_mode = Action3d_Rotation;
        //开始旋转视图围绕屏幕轴
        view->StartRotation(event->pos().x(), event->pos().y());
    }
}
​

4、显示模型后输入选择函数

void Mainwin::trigerdrawbox(){    TopoDS_Shape box = occ.createBox();    Handle(AIS_Shape) aisBox = new AIS_Shape(box);    Dui->GetInteractiveContext()->EraseAll(Standard_True);    Dui->GetInteractiveContext()->Display(aisBox, Standard_True);    Dui->GetView()->FitAll();    Dui->selectMode(aisBox);  }​