OpenCASCADE+Qt创建建模平台

1、建模平台效果

2、三维控件OCCWidget

  将V3d_View视图与控件句柄绑定即可实现3d视图嵌入Qt中，为了方便也可以基于QOpenGLWidget控件进行封装，方便嵌入各种窗体使用并自由缩放。

#ifndef OCCTWIDGET_H#define OCCTWIDGET_H#include #include #include #include #include #include #include #include #include #include #include #include #include //三维显示窗口class OCCTWidget : public QOpenGLWidget{    Q_OBJECTpublic:    explicit OCCTWidget(QWidget *parent = nullptr);    //  获取三维环境交互对象    Handle(AIS_InteractiveContext) getInteractiveContext(){return m_InteractiveContext;}    //  获取三维显示界面    Handle(V3d_View)  get3dView(){return m_3dView;}private:    // 初始化交互环境    void initializeInteractiveContext();    // 交互式上下文能够管理一个或多个查看器(viewer)中的图形行为和交互式对象的选择    Handle(AIS_InteractiveContext) m_InteractiveContext;    // 定义查看器(viewer)类型对象上的服务    Handle(V3d_Viewer) m_3dViewer;    // 创建一个视图    Handle(V3d_View) m_3dView;    // 创建3d接口定义图形驱动程序    Handle(Graphic3d_GraphicDriver) m_graphicDriver;protected:    // 覆写绘图事件    void paintEvent(QPaintEvent *);    // 覆写窗口尺寸变化事件    void resizeEvent(QResizeEvent *);    // 覆写鼠标按键按下事件    void mousePressEvent(QMouseEvent *event);    // 覆写鼠标按键释放事件    void mouseReleaseEvent(QMouseEvent *event);    // 覆写鼠标移动事件    void mouseMoveEvent(QMouseEvent *event);    // 覆写鼠标滚轮事件    void wheelEvent(QWheelEvent *event);private:    Standard_Integer m_xValue;    // 记录鼠标平移坐标X    Standard_Integer m_yValue;    // 记录鼠标平移坐标Y    CurrentAction3d m_currentMode; // 三维场景转换模式};#endif // OCCTWIDGET_H

void OCCTWidget::initializeInteractiveContext(){    //若交互式上下文为空，则创建对象    if (m_InteractiveContext.IsNull())    {        //此对象提供与X server的连接，在Windows和Mac OS中不起作用        Handle(Aspect_DisplayConnection) m_display_donnection = new Aspect_DisplayConnection();        //创建OpenGl图形驱动        if (m_graphicDriver.IsNull())        {            m_graphicDriver = new OpenGl_GraphicDriver(m_display_donnection);        }        //获取QWidget的窗口系统标识符        WId window_handle = (WId) winId();                // 创建Windows NT 窗口        Handle(WNT_Window) wind = new WNT_Window((Aspect_Handle) window_handle);        //创建3D查看器        m_3dViewer = new V3d_Viewer(m_graphicDriver);        //创建视图        m_3dView = m_3dViewer->CreateView();        m_3dView->SetWindow(wind);        //打开窗口        if (!wind->IsMapped())        {            wind->Map();        }        //创建交互式上下文        m_InteractiveContext = new AIS_InteractiveContext(m_3dViewer);          ……………………………………        ……………………………………    }}

3、三维建模类OCCModeling

  对OCC提供的各种建模函数进行验证，并实现较为复杂的水瓶建模。

#include #include #include #include #include   #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include class OCCTModeling{public://  生成立方体static TopoDS_Shape CreateBoxModel(Standard_Real _dx = 1.0, Standard_Real _dy = 1.0, Standard_Real _dz = 1.0);//  生成圆柱static TopoDS_Shape CreateCylinder(Standard_Real _R = 0.5, Standard_Real _H = 2.0);//  球体static TopoDS_Shape CreateSphere(Standard_Real _R = 1.0);//  生成圆锥static TopoDS_Shape CreateCone(Standard_Real _R1 = 1.0, Standard_Real _R2 = 0.0, Standard_Real _H = 2.0);//  生成圆环体static TopoDS_Shape CreateTorus(Standard_Real _R1 = 2.0, Standard_Real _R2 = 0.5);//  生成水瓶 static TopoDS_Shape CreateBottle(Standard_Real _Width = 60.0, Standard_Real _Height = 40.0, Standard_Real _Thickness = 20.0);//  生成直管static TopoDS_Shape CreatePipe(const Standard_Real dRadius = 20.0, const Standard_Real dThickness = 2.0, const Standard_Real dLength = 100.0);};

4、源码地址