OpenCasCade标注显示类（独立）

怼烎@ 2022-01-06 07:04 740阅读 0赞

比如我在OCC绘图区画一个点P，然后在点P附近显示部分标注说明，如下图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9zdHVkeS1saWZlLmJsb2cuY3Nkbi5uZXQ_size_16_color_FFFFFF_t_70][]

上图在指定位置 显示了指示性文字描述，OCC实现过程，一个类实现此功能 ISession\_Text 类，在OCC例子程序中可以找到，这里是把它单独分离出来，只依赖OCC标准库文件。

**ISession\_Text.h:**

// ISession_Text.h: interface for the ISession_Text class.
    //
    //
    
    #if !defined(AFX_ISESSION_TEXT_H__A9B277C4_A69E_11D1_8DA4_0800369C8A03__INCLUDED_)
    #define AFX_ISESSION_TEXT_H__A9B277C4_A69E_11D1_8DA4_0800369C8A03__INCLUDED_
    
    #if _MSC_VER >= 1000
    #pragma once
    #endif // _MSC_VER >= 1000
    
    #include <Standard_Macro.hxx>
    #include <Standard_DefineHandle.hxx>
    #include <TCollection_AsciiString.hxx>
    #include <Aspect_TypeOfText.hxx>
    #include <Standard_Real.hxx>
    #include <Standard_Integer.hxx>
    #include <Quantity_Factor.hxx>
    #include <Quantity_PlaneAngle.hxx>
    #include <PrsMgr_PresentationManager3d.hxx>
    #include <SelectMgr_Selection.hxx>
    #include <Standard_OStream.hxx>
    #include <Standard_IStream.hxx>
    #include <Standard_CString.hxx>
    #include <SelectMgr_SelectableObject.hxx>
    //新增
    #include "Prs3d_Text.hxx"
    #include <AIS_Shape.hxx>
    #include <V3d_Viewer.hxx>
    
    class TCollection_AsciiString;
    class SelectMgr_Selection;
    
    DEFINE_STANDARD_HANDLE(ISession_Text,AIS_InteractiveObject)
    class ISession_Text : public AIS_InteractiveObject  
    {
    public:
    	ISession_Text();
    
        ISession_Text           (const TCollection_AsciiString& aText,
                                 const Standard_Real            anX         = 0   ,
                                 const Standard_Real            anY         = 0   ,
                                 const Standard_Real            aZ          = 0   ,
                                 const Aspect_TypeOfText        aType       = Aspect_TOT_SOLID,
                                 const Quantity_PlaneAngle      anAngle     = 0.0 ,
                                 const Standard_Real            aSlant      = 0.0 ,
                                 const Standard_Integer         aColorIndex = 1   ,
                                 const Standard_Integer         aFontIndex  = 1   ,
                                 const Quantity_Factor          aScale      = 0.1   );
        ISession_Text
                                (const TCollection_AsciiString& aText, 
                                 gp_Pnt&                        aPoint,
                                 const Aspect_TypeOfText        aType       = Aspect_TOT_SOLID,
                                 const Quantity_PlaneAngle      anAngle     = 0.0 ,
                                 const Standard_Real            aSlant      = 0.0 ,
                                 const Standard_Integer         aColorIndex = 1   ,
                                 const Standard_Integer         aFontIndex  = 1   ,
                                 const Quantity_Factor          aScale      = 0.1   );
    
    	virtual ~ISession_Text();
    
    inline   Standard_Integer        NbPossibleSelection() const;
    inline   TCollection_AsciiString GetText() const;
    inline   void                    SetText(const TCollection_AsciiString& atext) ;
    inline   void                    GetCoord(Standard_Real& X, Standard_Real& Y, Standard_Real& Z) const ;
    inline   void                    SetCoord(const Standard_Real X, const Standard_Real Y, const Standard_Real Z=0);
    inline   Aspect_TypeOfText       GetTypeOfText() const;
    inline   void                    SetTypeOfText(const Aspect_TypeOfText aNewTypeOfText) ;
    inline   Standard_Real           GetAngle() const;
    inline   void                    SetAngle(const Standard_Real aNewAngle) ;
    inline   Standard_Real           GetSlant() const;
    inline   void                    SetSlant(const Standard_Real aNewSlant) ;
    inline   Standard_Integer        GetColorIndex() const;
    inline   void                    SetColorIndex(const Standard_Integer aNewColorIndex) ;
    inline   Standard_Integer        GetFontIndex() const;
    inline   void                    SetFontIndex(const Standard_Integer aNewFontIndex) ;
    inline   Quantity_Factor         GetScale() const;
    inline   void                    SetScale  (const Quantity_Factor aNewScale) ;
    
    
    DEFINE_STANDARD_RTTI(ISession_Text)
    
    private: 
    
      void Compute          (const Handle(PrsMgr_PresentationManager3d)& aPresentationManager,
                            const Handle(Prs3d_Presentation)& aPresentation,
                            const Standard_Integer aMode);
      void Compute          (const Handle(Prs3d_Projector)& aProjector,
                            const Handle(Prs3d_Presentation)& aPresentation);
      void ComputeSelection (const Handle(SelectMgr_Selection)& aSelection,
                            const Standard_Integer unMode) ;
    
    
     // Fields PRIVATE
     //
    TCollection_AsciiString MyText       ; 
    Standard_Real           MyX          ;
    Standard_Real           MyY          ;
    Standard_Real           MyZ          ;
    Aspect_TypeOfText       MyTypeOfText ;
    Standard_Real           MyAngle      ;
    Standard_Real           MySlant      ;
    Standard_Integer        MyColorIndex ;
    Standard_Integer        MyFontIndex  ;
    Quantity_Factor         MyScale      ;
    Standard_Real           MyWidth      ;
    Standard_Real           MyHeight     ;
    
    
    };
    
     inline Standard_Integer ISession_Text::NbPossibleSelection() const 
    { return 1; }
    
    inline TCollection_AsciiString ISession_Text::GetText() const 
    {  return MyText ; }
    
    inline void ISession_Text::SetText(const TCollection_AsciiString& atext)
    {  MyText = atext; }
    
    inline void ISession_Text::GetCoord(Standard_Real& X, Standard_Real& Y, Standard_Real& Z) const 
    {  X = MyX;  Y = MyY; Z = MyZ;}
    
    inline void ISession_Text::SetCoord(const Standard_Real X, const Standard_Real Y, const Standard_Real Z)
    {  MyX = X ;  MyY = Y ;  MyZ = Z ;}
    
    inline Aspect_TypeOfText ISession_Text::GetTypeOfText() const 
    {  return MyTypeOfText; }
    
    inline void ISession_Text::SetTypeOfText(const Aspect_TypeOfText aNewTypeOfText)
    {  MyTypeOfText = aNewTypeOfText; }
    
    inline Standard_Real ISession_Text::GetAngle() const 
    {  return MyAngle; }
    
    inline void ISession_Text::SetAngle(const Standard_Real aNewAngle)
    {  MyAngle = aNewAngle; }
    
    inline Standard_Real ISession_Text::GetSlant() const 
    {  return MySlant; }
    
    inline void ISession_Text::SetSlant(const Standard_Real aNewSlant)
    {  MySlant = aNewSlant; }
    
    inline Standard_Integer ISession_Text::GetColorIndex() const 
    {  return MyColorIndex; }
    
    inline void ISession_Text::SetColorIndex(const Standard_Integer aNewColorIndex)
    {  MyColorIndex = aNewColorIndex; }
    
    inline Standard_Integer ISession_Text::GetFontIndex() const 
    { return MyFontIndex; }
    
    inline void ISession_Text::SetFontIndex(const Standard_Integer aNewFontIndex)
    {  MyFontIndex = aNewFontIndex; }
    
    inline Quantity_Factor ISession_Text::GetScale() const 
    {  return MyScale; }
    
    inline void ISession_Text::SetScale(const Quantity_Factor aNewScale)
    {  MyScale  = aNewScale; }
    
    #endif // !defined(AFX_ISESSION_TEXT_H__A9B277C4_A69E_11D1_8DA4_0800369C8A03__INCLUDED_)

**ISession\_Text.cpp:**

// ISession_Text.cpp: implementation of the ISession_Text class.
    //
    //
    
    #include "stdafx.h"
    #include "ISession_Text.h"
    
    #ifdef _DEBUG
    #undef THIS_FILE
    static char THIS_FILE[]=__FILE__;
    //#define new DEBUG_NEW
    #endif
    IMPLEMENT_STANDARD_HANDLE(ISession_Text,AIS_InteractiveObject)
    IMPLEMENT_STANDARD_RTTIEXT(ISession_Text,AIS_InteractiveObject)
    
    //
    // Construction/Destruction
    //
    
    ISession_Text::ISession_Text()
    {
    
    }
    
    ISession_Text::ISession_Text
                     (const TCollection_AsciiString& aText, 
                      const Standard_Real            anX ,        // = 0
                      const Standard_Real            anY ,        // = 0
                      const Standard_Real            aZ  ,        // = 0
    			      const Aspect_TypeOfText        aType,       // = SOLID,
    			      const Quantity_PlaneAngle      anAngle,     // = 0.0
    			      const Standard_Real            aslant,      // = 0.0
    			      const Standard_Integer         aColorIndex, // = 0
    			      const Standard_Integer         aFontIndex,  // = 1
    			      const Quantity_Factor          aScale)      // = 1
                      :AIS_InteractiveObject(),MyText(aText),MyX(anX),MyY(anY),MyZ(aZ),
                      MyTypeOfText(aType),MyAngle(anAngle),MySlant(aslant),MyFontIndex(aFontIndex),
                      MyColorIndex(aColorIndex),MyScale(aScale),MyWidth(0),MyHeight(0)
    {
    
    }
    
    ISession_Text::ISession_Text
                     (const TCollection_AsciiString& aText, 
                      gp_Pnt&                        aPoint,
    			      const Aspect_TypeOfText        aType,       // = SOLID,
    			      const Quantity_PlaneAngle      anAngle,     // = 0.0
    			      const Standard_Real            aslant,      // = 0.0
    			      const Standard_Integer         aColorIndex, // = 0
    			      const Standard_Integer         aFontIndex,  // = 1
    			      const Quantity_Factor          aScale)      // = 1
                      :AIS_InteractiveObject(),MyText(aText),MyX(aPoint.X()),MyY(aPoint.Y()),MyZ(aPoint.Z()),
                      MyTypeOfText(aType),MyAngle(anAngle),MySlant(aslant),MyFontIndex(aFontIndex),
                      MyColorIndex(aColorIndex),MyScale(aScale),MyWidth(0),MyHeight(0)
    {
    
    }
    
    ISession_Text::~ISession_Text()
    {
    
    }
    
    void ISession_Text::Compute(const Handle(PrsMgr_PresentationManager3d)& /*aPresentationManager*/,
                                const Handle(Prs3d_Presentation)& aPresentation,
                                const Standard_Integer /*aMode*/)
    {
        Prs3d_Text::Draw(aPresentation,myDrawer,MyText,gp_Pnt(  MyX ,MyY,MyZ ));
    }
    
    void ISession_Text::Compute(const Handle(Prs3d_Projector)& /*aProjector*/,
                                const Handle(Prs3d_Presentation)& /*aPresentation*/) 
     {
     }
    
    void ISession_Text::ComputeSelection(const Handle(SelectMgr_Selection)& /*aSelection*/, 
    				     const Standard_Integer /*unMode*/)
    {
    }

**简单使用例子：**

void OccEditView::DrawPoint(const Standard_Real Xp, const Standard_Real Yp, const Standard_Real Zp)
    {
    	gp_Pnt P(Xp,Yp,Zp);
    	Handle(AIS_Point) aPoint = new AIS_Point(new Geom_CartesianPoint(P)); 
    	myAISContext->SetColor(aPoint,Quantity_NOC_BLUE3);
    	myAISContext->Display(aPoint); 
    
    
        //在实例化类的时候输入需要显示的字符，目前不支持中文
    	Handle(ISession_Text)  aGraphicText = new ISession_Text("This a Point!",P.X()+50.,P.Y()+10.,P.Z()+10.,);
    	myAISContext->Display(aGraphicText); 
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9zdHVkeS1saWZlLmJsb2cuY3Nkbi5uZXQ_size_16_color_FFFFFF_t_70]: /images/20211227/a453db5160594309a89b731d6933446d.png