src/OpenGl/OpenGl_Text.hxx

   1 // Created on: 2011-07-13
   2 // Created by: Sergey ZERCHANINOV
   3 // Copyright (c) 2011-2013 OPEN CASCADE SAS
   4 //
   5 // This file is part of Open CASCADE Technology software library.
   6 //
   7 // This library is free software; you can redistribute it and/or modify it under
   8 // the terms of the GNU Lesser General Public License version 2.1 as published
   9 // by the Free Software Foundation, with special exception defined in the file
  10 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
  11 // distribution for complete text of the license and disclaimer of any warranty.
  12 //
  13 // Alternatively, this file may be used under the terms of Open CASCADE
  14 // commercial license or contractual agreement.
  15
  16 #ifndef OpenGl_Text_Header
  17 #define OpenGl_Text_Header
  18
  19 #include <OpenGl_Element.hxx>
  20
  21 #include <OpenGl_AspectText.hxx>
  22 #include <OpenGl_TextParam.hxx>
  23 #include <OpenGl_TextBuilder.hxx>
  24
  25 #include <TCollection_ExtendedString.hxx>
  26 #include <Graphic3d_Vertex.hxx>
  27 #include <Graphic3d_HorizontalTextAlignment.hxx>
  28 #include <Graphic3d_RenderingParams.hxx>
  29 #include <Graphic3d_VerticalTextAlignment.hxx>
  30
  31 #include <gp_Ax2.hxx>
  32
  33 class OpenGl_PrinterContext;
  34
  35 //! Text rendering
  36 class OpenGl_Text : public OpenGl_Element
  37 {
  38
  39 public:
  40
  41   //! Main constructor
  42   Standard_EXPORT OpenGl_Text (const Standard_Utf8Char* theText,
  43                                const OpenGl_Vec3&       thePoint,
  44                                const OpenGl_TextParam&  theParams);
  45
  46   //! Creates new text in 3D space.
  47   Standard_EXPORT OpenGl_Text (const Standard_Utf8Char* theText,
  48                                const gp_Ax2&            theOrientation,
  49                                const OpenGl_TextParam&  theParams);
  50
  51   //! Setup new string and position
  52   Standard_EXPORT void Init (const Handle(OpenGl_Context)& theCtx,
  53                              const Standard_Utf8Char*      theText,
  54                              const OpenGl_Vec3&            thePoint);
  55
  56   //! Setup new string and parameters
  57   Standard_EXPORT void Init (const Handle(OpenGl_Context)& theCtx,
  58                              const Standard_Utf8Char*      theText,
  59                              const OpenGl_Vec3&            thePoint,
  60                              const OpenGl_TextParam&       theParams);
  61
  62   //! Setup new position
  63   Standard_EXPORT void SetPosition (const OpenGl_Vec3& thePoint);
  64
  65   //! Setup new font size
  66   Standard_EXPORT void SetFontSize (const Handle(OpenGl_Context)& theContext,
  67                                     const Standard_Integer        theFontSize);
  68
  69   Standard_EXPORT virtual void Render  (const Handle(OpenGl_Workspace)& theWorkspace) const;
  70   Standard_EXPORT virtual void Release (OpenGl_Context* theContext);
  71
  72 public: //! @name methods for compatibility with layers
  73
  74   //! Empty constructor
  75   Standard_EXPORT OpenGl_Text();
  76
  77   //! Create key for shared resource
  78   Standard_EXPORT static TCollection_AsciiString FontKey (const OpenGl_AspectText& theAspect,
  79                                                           const Standard_Integer   theHeight,
  80                                                           const unsigned int       theResolution);
  81
  82   //! Find shared resource for specified font or initialize new one
  83   Standard_EXPORT static Handle(OpenGl_Font) FindFont (const Handle(OpenGl_Context)& theCtx,
  84                                                        const OpenGl_AspectText&      theAspect,
  85                                                        const Standard_Integer        theHeight,
  86                                                        const unsigned int            theResolution,
  87                                                        const TCollection_AsciiString theKey);
  88
  89   //! Compute text width
  90   Standard_EXPORT static void StringSize (const Handle(OpenGl_Context)& theCtx,
  91                                           const NCollection_String&     theText,
  92                                           const OpenGl_AspectText&      theTextAspect,
  93                                           const OpenGl_TextParam&       theParams,
  94                                           const unsigned int            theResolution,
  95                                           Standard_ShortReal&           theWidth,
  96                                           Standard_ShortReal&           theAscent,
  97                                           Standard_ShortReal&           theDescent);
  98
  99   //! Setup new string and parameters
 100   Standard_EXPORT void Init (const Handle(OpenGl_Context)&     theCtx,
 101                              const TCollection_ExtendedString& theText,
 102                              const OpenGl_Vec2&                thePoint,
 103                              const OpenGl_TextParam&           theParams);
 104
 105   //! Perform rendering
 106   Standard_EXPORT void Render (const Handle(OpenGl_PrinterContext)& thePrintCtx,
 107                                const Handle(OpenGl_Context)&        theCtx,
 108                                const OpenGl_AspectText&             theTextAspect,
 109                                const unsigned int                   theResolution = Graphic3d_RenderingParams::THE_DEFAULT_RESOLUTION) const;
 110
 111 protected:
 112
 113   //! Destructor
 114   Standard_EXPORT virtual ~OpenGl_Text();
 115
 116   friend class OpenGl_Trihedron;
 117   friend class OpenGl_GraduatedTrihedron;
 118
 119 private:
 120
 121   //! Release cached VBO resources
 122   void releaseVbos (OpenGl_Context* theCtx);
 123
 124   //! Setup matrix.
 125   void setupMatrix (const Handle(OpenGl_PrinterContext)& thePrintCtx,
 126                     const Handle(OpenGl_Context)&        theCtx,
 127                     const OpenGl_AspectText&             theTextAspect,
 128                     const OpenGl_Vec3                    theDVec) const;
 129
 130   //! Draw arrays of vertices.
 131   void drawText (const Handle(OpenGl_PrinterContext)& thePrintCtx,
 132                  const Handle(OpenGl_Context)&        theCtx,
 133                  const OpenGl_AspectText&             theTextAspect) const;
 134
 135   //! Main rendering code
 136   void render (const Handle(OpenGl_PrinterContext)& thePrintCtx,
 137                const Handle(OpenGl_Context)&        theCtx,
 138                const OpenGl_AspectText&             theTextAspect,
 139                const TEL_COLOUR&                    theColorText,
 140                const TEL_COLOUR&                    theColorSubs,
 141                const unsigned int                   theResolution) const;
 142
 143 protected:
 144
 145   mutable Handle(OpenGl_Font)                             myFont;
 146   mutable NCollection_Vector<GLuint>                      myTextures;   //!< textures' IDs
 147   mutable NCollection_Vector<Handle(OpenGl_VertexBuffer)> myVertsVbo;   //!< VBOs of vertices
 148   mutable NCollection_Vector<Handle(OpenGl_VertexBuffer)> myTCrdsVbo;   //!< VBOs of texture coordinates
 149   mutable Font_FTFont::Rect                               myBndBox;
 150
 151 protected:
 152
 153   mutable OpenGl_Mat4d myProjMatrix;
 154   mutable OpenGl_Mat4d myModelMatrix;
 155   mutable OpenGl_Mat4d myOrientationMatrix;
 156   mutable GLint    myViewport[4];
 157   mutable GLdouble myWinX;
 158   mutable GLdouble myWinY;
 159   mutable GLdouble myWinZ;
 160   mutable GLdouble myScaleHeight;
 161   mutable GLdouble myExportHeight;
 162
 163 protected:
 164
 165   OpenGl_TextParam   myParams;
 166   NCollection_String myString;
 167   OpenGl_Vec3        myPoint;
 168   bool               myIs2d;
 169   gp_Ax2             myOrientation; //!< Text orientation in 3D space.
 170   bool               myHasPlane;    //!< Check if text have orientation in 3D space.
 171
 172 public:
 173
 174   DEFINE_STANDARD_ALLOC
 175
 176 };
 177
 178 #endif //OpenGl_Text_Header