OpenCasCade学习笔记(三)：加载显示STEP格式图片，并实现平移、缩放和旋转操作
C3DWidget.h
#pragma once#include <QtWidgets/QApplication>#include <QtWidgets/QWidget>#include "qevent.h"#include "stable.h"#define BUTTON_OFF0#define BUTTON_ON1class C3DWidget : public QWidget{Q_OBJECTpublic:C3DWidget(QWidget *parent = Q_NULLPTR);protected://!三维场景转换模式enum CurrentAction3d{CurAction3d_Nothing,CurAction3d_DynamicPanning, //平移CurAction3d_DynamicZooming, //缩放CurAction3d_DynamicRotation //旋转};//!覆写绘图事件void paintEvent(QPaintEvent *);//!覆写窗口尺寸变化事件void resizeEvent(QResizeEvent *);//!返回窗口的绘制引擎QPaintEngine *paintEngine() const;//!覆写键盘按键按下事件//void keyPressEvent(QKeyEvent *event);//!覆写键盘按键释放事件//void keyReleaseEvent(QKeyEvent *event);//!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);//加载step模型void loadSTEP();//显示STEP模型void displaySTEP();//把屏幕坐标转换为窗口坐标gp_Pnt ConvertClickToPoint(Standard_Real theX, Standard_Real theY, Handle(V3d_View) theView);void DrawLineByMouse(gp_Pnt thePntStart, gp_Pnt thePntEnd);private://!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_context;//!定义查看器(viewer)类型对象上的服务Handle(V3d_Viewer) m_viewer;//!创建一个视图Handle(V3d_View) m_view;//!创建3d接口定义图形驱动程序Handle(Graphic3d_GraphicDriver) m_graphic_driver;//存储STEP模型形状TopoDS_Shape m_Shape;Handle_AIS_Shape myAISShape;//线的模型Handle_AIS_Shape myLine;Standard_Integer m_x_max; //!记录鼠标平移坐标XStandard_Integer m_y_max; //!记录鼠标平移坐标YCurrentAction3d m_current_mode; //!三维场景转换模式(平移\缩放\旋转)bool leftMouseBtn = BUTTON_OFF; //记录鼠标左键状态gp_Pnt m_line_start_point;//记录鼠标画线开始点//gp_Pnt m_line_end_point;//记录鼠标画线结束点//bool draw_line = false;};
C3DWidget.cpp
#include "C3DWidget.h"#include "ProjLib.hxx"#include "ELSLib.hxx"#include "GC_MakeSegment.hxx"#include "BRepBuilderAPI_MakeEdge.hxx"#include <gl\GLU.h>#include <GeomAPI_IntCS.hxx>#include "qdebug.h"C3DWidget::C3DWidget(QWidget *parent): QWidget(parent){//若交互式上下文为空，则创建对象if (m_context.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_graphic_driver.IsNull()){m_graphic_driver = 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_viewer = new V3d_Viewer(m_graphic_driver, Standard_ExtString("viewer3d"));//创建视图m_view = m_viewer->CreateView();m_view->SetWindow(wind);//打开窗口if (!wind->IsMapped()){wind->Map();}m_context = new AIS_InteractiveContext(m_viewer); //创建交互式上下文//配置查看器的光照m_viewer->SetDefaultLights();m_viewer->SetLightOn();//设置视图的背景颜色为灰色m_view->SetBackgroundColor(Quantity_NOC_GRAY60);m_view->MustBeResized();//显示直角坐标系，可以配置在窗口显示位置、文字颜色、大小、样式m_view->TriedronDisplay(Aspect_TOTP_LEFT_LOWER, Quantity_NOC_GOLD, 0.08, V3d_ZBUFFER);//设置显示模式m_context->SetDisplayMode(AIS_Shaded, Standard_True);loadSTEP();displaySTEP();}//配置QWidgetsetAttribute(Qt::WA_PaintOnScreen);setAttribute(Qt::WA_NoSystemBackground);setBackgroundRole(QPalette::NoRole); //无背景setFocusPolicy(Qt::StrongFocus);setAttribute(Qt::WA_PaintOnScreen);setAttribute(Qt::WA_NoSystemBackground);setMouseTracking(true); //开启鼠标位置追踪}void C3DWidget::paintEvent(QPaintEvent *){//if(draw_line == false)m_view->Redraw();}void C3DWidget::resizeEvent(QResizeEvent *){if (!m_view.IsNull()){m_view->MustBeResized();}}QPaintEngine *C3DWidget::paintEngine() const{return 0;}void C3DWidget::loadSTEP(){/*将STEP文件转换为OCCT形状：加载文件，检查文件一致性，设置翻译参数，执行翻译，获取结果。*///load the fileSTEPControl_Reader reader;IFSelect_ReturnStatus stat = reader.ReadFile("sample.STEP");switch (stat){case IFSelect_RetVoid:std::cout << "normal execution which created nothing, or no data to process!" << std::endl;break;case IFSelect_RetDone:break;case IFSelect_RetError:std::cout << "error in command or input data, no execution!" << std::endl;break;case IFSelect_RetFail:std::cout << "execution was run and has failed!" << std::endl;break;case IFSelect_RetStop:std::cout << "indicates end or stop (such as Raise)!" << std::endl;break;default:break;}if (stat != IFSelect_RetDone)return;//Selecting STEP entities for translation : The whole file//加载文件Standard_Integer NbRoots = reader.NbRootsForTransfer();Standard_Integer num = reader.TransferRoots();//Mapping STEP entities to Open CASCADE Technology shapesm_Shape = reader.OneShape();}void C3DWidget::displaySTEP(){//display STEP myAISShape = new AIS_Shape(m_Shape);myAISShape->SetDisplayMode(AIS_Shaded);m_context->Display(myAISShape, true);}void C3DWidget::mousePressEvent(QMouseEvent *event){if (((event->buttons() & Qt::MidButton) && (QApplication::keyboardModifiers() == Qt::CTRL)))//平移{m_current_mode = CurAction3d_DynamicPanning;m_x_max = event->pos().x(); //记录起始X位置m_y_max = event->pos().y(); //记录起始Y位置}else if (event->buttons() & Qt::MidButton) //旋转{m_current_mode = CurAction3d_DynamicRotation;m_view->StartRotation(event->pos().x(), event->pos().y());}if (event->buttons() & Qt::LeftButton){leftMouseBtn = BUTTON_ON;//m_line_start_point = ConvertClickToPoint(event->pos().x(), event->pos().x(), m_view);}}void C3DWidget::mouseReleaseEvent(QMouseEvent *event){GLdouble res[3];GLdouble mm[16], pm[16]; GLint vp[4];GLfloat pix;m_current_mode = CurAction3d_Nothing;if (leftMouseBtn == BUTTON_ON){leftMouseBtn = BUTTON_OFF;//GLdouble x = event->pos().x();//GLdouble y = event->pos().y();//GLint viewport[4];//GLdouble modleview[16];//GLdouble projection[16];获取必要的矩阵//glPushMatrix();//glLoadIdentity();//glLoadMatrixd(m_view->Camera()->OrientationMatrix());//glGetIntegerv(GL_VIEWPORT, viewport);//获取视口//glGetDoublev(GL_MODELVIEW_MATRIX, modleview);//获取模型视图矩阵//glGetDoublev(GL_PROJECTION_MATRIX, projection);//获取投影矩阵//glPopMatrix();将屏幕坐标转换为窗口坐标//GLdouble winX = x;//GLdouble winY = viewport[3] - y;//GLdouble winZ1 = 0;//GLdouble winZ2 = 10;//double x1, y1, z1, x2, y2, z2;坐标变换//gluUnProject(winX, winY, winZ1, modleview, projection, viewport, &x1, &y1, &z1);//gluUnProject(winX, winY, winZ2, modleview, projection, viewport, &x2, &y2, &z2);//生成直线//Handle(Geom_Line) aLine = new Geom_Line(gp_Pnt(x1, y1, z1), gp_Dir(x2 - x1, y2 - y1, z2 - z1));//GeomAPI_IntCS intCS(aLine, aSurface);//gp_Pnt aPnt = intCS.Point(1);//qDebug() << aPnt.X() << aPnt.Y() << aPnt.Z();//====================方案二=====================获取模型视图矩阵//glGetDoublev(GL_MODELVIEW_MATRIX, mm);获取投影矩阵//glGetDoublev(GL_PROJECTION_MATRIX, pm);获取视口//glGetIntegerv(GL_VIEWPORT, vp);读取缓冲区的深度分量//glReadPixels(event->pos().x(), event->pos().y(), 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &pix);//GLfloat depthrange[2] = { 0,0 };//glGetFloatv(GL_DEPTH_RANGE, depthrange);//if (pix == depthrange[1])//qDebug() << "false";反投影//gluUnProject(event->pos().x(), event->pos().y(), pix, mm, pm, vp, &res[0], &res[1], &res[2]);qDebug() << res[0] << res[1] << res[2];}}void C3DWidget::mouseMoveEvent(QMouseEvent *event){switch (m_current_mode){case CurAction3d_DynamicPanning://执行平移m_view->Pan(event->pos().x() - m_x_max, m_y_max - event->pos().y());m_x_max = event->pos().x();m_y_max = event->pos().y();break;case CurAction3d_DynamicRotation://执行旋转m_view->Rotation(event->pos().x(), event->pos().y());break;}//if (leftMouseBtn == BUTTON_ON)//{//gp_Pnt m_line_end_point = ConvertClickToPoint(event->pos().x(), event->pos().x(), m_view);//DrawLineByMouse(m_line_start_point, m_line_end_point);//}}void C3DWidget::wheelEvent(QWheelEvent *event){m_view->StartZoomAtPoint(event->pos().x(), event->pos().y());m_view->ZoomAtPoint(0, 0, event->angleDelta().y(), 0); //执行缩放}gp_Pnt C3DWidget::ConvertClickToPoint(Standard_Real theX, Standard_Real theY, Handle(V3d_View) theView){Standard_Real XEye, YEye, ZEye, XAt, YAt, ZAt;theView->Eye(XEye, YEye, ZEye);theView->At(XAt, YAt, ZAt);gp_Pnt EyePoint(XEye, YEye, ZEye);gp_Pnt AtPoint(XAt, YAt, ZAt);gp_Vec EyeVector(EyePoint, AtPoint);gp_Dir EyeDir(EyeVector);gp_Pln PlaneOfTheView = gp_Pln(AtPoint, EyeDir);Standard_Real X, Y, Z;theView->Convert(int(theX), int(theY), X, Y, Z);gp_Pnt ConvertedPoint(X, Y, Z);gp_Pnt2d ConvertedPointOnPlane = ProjLib::Project(PlaneOfTheView, ConvertedPoint);gp_Pnt ResultPoint = ElSLib::Value(ConvertedPointOnPlane.X(),ConvertedPointOnPlane.Y(),PlaneOfTheView);return ResultPoint;}void C3DWidget::DrawLineByMouse(gp_Pnt thePntStart, gp_Pnt thePntEnd){//检查传入参数if (thePntStart.IsEqual(thePntEnd, 1e-3))return;//构建拓扑线段Handle(Geom_TrimmedCurve) aSegment =GC_MakeSegment(thePntStart, thePntEnd);TopoDS_Edge aEdge = BRepBuilderAPI_MakeEdge(aSegment);//将构建的拓扑线段设置至AIS_Shape形状中myAISShape->SetShape(aEdge);//移除前面绘画的旧线段, 绘制新线段。m_context->Remove(myAISShape, true);m_context->Display(myAISShape, false);//更新Viewm_context->UpdateCurrentViewer();}
stable.h
#pragma once#include <AIS_InteractiveContext.hxx>#include <AIS_InteractiveObject.hxx>#include <AIS_ListOfInteractive.hxx>#include <AIS_ListIteratorOfListOfInteractive.hxx>#include <AIS_Shape.hxx>#include <AIS_Trihedron.hxx>#include <Aspect_Background.hxx>#include <Aspect_TypeOfline.hxx>#include <Aspect_WidthOfline.hxx>#include <Aspect_Window.hxx>#include <Bnd_Box2d.hxx>#include <BndLib_Add2dCurve.hxx>#include <BRep_Builder.hxx>#include <BRep_Tool.hxx>#include <BRepBuilderAPI.hxx> #include <BRepAlgo.hxx> #include <BRepTools.hxx>#include <BRepPrimAPI_MakeBox.hxx>#include <BRepPrimAPI_MakeCylinder.hxx>#include <Standard_DefineHandle.hxx>#include <DsgPrs_LengthPresentation.hxx>#include <GCE2d_MakeSegment.hxx>#include <GCPnts_TangentialDeflection.hxx>#include <Geom_CartesianPoint.hxx>#include <Geom_Axis2Placement.hxx>#include <Geom_CartesianPoint.hxx>#include <Geom_Line.hxx>#include <Geom_Surface.hxx>#include <Geom2d_BezierCurve.hxx>#include <Geom2d_BSplineCurve.hxx>#include <Geom2d_Curve.hxx>#include <Geom2d_TrimmedCurve.hxx>#include <Geom2dAdaptor_Curve.hxx>#include <GeomAbs_CurveType.hxx>#include <GeomAdaptor_Curve.hxx>#include <GeomTools_Curve2dSet.hxx>#include <gp_Ax2d.hxx>#include <gp_Circ2d.hxx>#include <gp_Dir2d.hxx>#include <gp_Lin2d.hxx>#include <gp_Pnt2d.hxx>#include <gp_Vec.hxx>#include <gp_Vec2d.hxx>#include <MMgt_TShared.hxx>#include <OSD_Environment.hxx>#include <Precision.hxx>#include <Prs3d_Drawer.hxx>#include <Prs3d_IsoAspect.hxx>#include <Prs3d_LineAspect.hxx>#include <Prs3d_Text.hxx>#include <Quantity_Factor.hxx>#include <Quantity_Length.hxx>#include <Quantity_NameOfColor.hxx>#include <Quantity_PhysicalQuantity.hxx>#include <Quantity_PlaneAngle.hxx>#include <Quantity_TypeOfColor.hxx>#include <SelectMgr_EntityOwner.hxx>#include <SelectMgr_SelectableObject.hxx>#include <SelectMgr_Selection.hxx>#include <SelectMgr_SelectionManager.hxx>#include <Standard_Boolean.hxx>#include <Standard_CString.hxx>#include <Standard_ErrorHandler.hxx>#include <Standard_Integer.hxx>#include <Standard_IStream.hxx>#include <Standard_Macro.hxx>#include <Standard_NotImplemented.hxx>#include <Standard_OStream.hxx>#include <Standard_Real.hxx>#include <StdPrs_Curve.hxx>#include <StdPrs_Point.hxx>#include <StdPrs_PoleCurve.hxx>#include <TCollection_AsciiString.hxx>#include <TColgp_Array1OfPnt2d.hxx>#include <TColgp_HArray1OfPnt2d.hxx>#include <TCollection_AsciiString.hxx>#include <TColStd_HSequenceOfTransient.hxx>#include <TColStd_MapIteratorOfMapOfTransient.hxx>#include <TColStd_MapOfTransient.hxx>#include <TopExp_Explorer.hxx>#include <TopoDS.hxx>#include <TopoDS_Compound.hxx>#include <TopoDS_ListIteratorOfListOfShape.hxx>#include <TopoDS_Shape.hxx>#include <TopoDS_Solid.hxx>#include <TopoDS_Vertex.hxx>#include <TopExp.hxx>#include <TopTools_ListIteratorOfListOfShape.hxx>#include <TopTools_HSequenceOfShape.hxx>#include <TopTools_DataMapOfShapeInteger.hxx>#include <UnitsAPI.hxx>#include <V3d_View.hxx>#include <V3d_Viewer.hxx>#include <WNT_Window.hxx>#include <OpenGl_GraphicDriver.hxx> // specific STEP#include <STEPControl_Controller.hxx>#include <STEPControl_Reader.hxx>#include <STEPControl_Writer.hxx>
main.cpp
#include "C3DWidget.h"int main(int argc, char *argv[]){QApplication a(argc, argv);C3DWidget w;w.show();return a.exec();}
