TextNode.hh

/*===========================================================================*\
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//=============================================================================
//
//  CLASS PointNode
//
//=============================================================================

#ifndef ACG_TEXTNODE_HH
#define ACG_TEXTNODE_HH


//== INCLUDES =================================================================

#include "BaseNode.hh"
#include "TransformNode.hh"
#include "DrawModes.hh"
#include <ACG/GL/IRenderer.hh>
#include <ACG/GL/VertexDeclaration.hh>
#include <vector>
#include <QFont>
#include <QFontMetrics>
#include <QImage>
#include <QPainter>
#include <QGLWidget>


//== NAMESPACES ===============================================================

namespace ACG {
namespace SceneGraph {

//== CLASS DEFINITION =========================================================



class ACGDLLEXPORT TextNode : public BaseNode
{
public:

  enum TextMode {
    SCREEN_ALIGNED, 
    SCREEN_ALIGNED_STATIC_SIZE, 
    OBJECT_ALIGNED  
  };

  TextNode( BaseNode*     _parent=0,
            const std::string&  _name="<TextNode>",
            TextMode     _textMode = SCREEN_ALIGNED,
            bool         _alwaysOnTop = false);

  ~TextNode();

  ACG_CLASSNAME(TextNode);

  DrawModes::DrawMode  availableDrawModes() const override;

  void boundingBox(Vec3d& _bbMin, Vec3d& _bbMax) override;

  void draw(GLState& _state, const DrawModes::DrawMode& _drawMode) override;

  void enter(GLState& _state, const DrawModes::DrawMode& _drawmode) override;
  void enterCompat(GLState& _state, const DrawModes::DrawMode& _drawmode);

  void leave(GLState& _state, const DrawModes::DrawMode& _drawmode) override;
  void leaveCompat(GLState& _state, const DrawModes::DrawMode& _drawmode);

  void getRenderObjects(ACG::IRenderer* _renderer, ACG::GLState&  _state , const ACG::SceneGraph::DrawModes::DrawMode&  _drawMode , const ACG::SceneGraph::Material* _mat) override;

  void setRenderingMode(TextMode _textMode);

  void setAlwaysOnTop(bool _alwaysOnTop);

  bool alwaysOnTop();

  TextMode renderingMode();

  void setText(std::string _text);

  void setSize(const double _size);

  void setPixelSize(const unsigned int _size);

  void setFont(const QFont& _font);

  float lastScale() {return lastScale_;};

protected:
  static void updateFont();

private:
  static quint32 nearestPowerOfTwo(quint32 num);

  void updateVBO();

  void bindVBO();

  void unbindVBO();

  void applyScreenAligned(GLState &_state);

  static std::map< char, std::pair<unsigned int, unsigned int> > createMap();

private:

  double size_;

  unsigned pixelSize_;

  std::string text_;

  TextMode textMode_;

  GLuint vbo_;

  std::vector<GLfloat> vertexBuffer_;
  size_t oldVboSize_;

  bool blendEnabled_;

  bool texture2dEnabled_;

  bool cullFaceEnabled_;

  bool depthEnabled_;

  bool alwaysOnTop_;

  bool alphaTest_;

  float alphaTestValue_;

  GLenum alphaTestFunc_;

  GLint blendSrc_;

  GLint blendDest_;

  ACG::VertexDeclaration vertexDecl_;

  float lastScale_;

  static std::map< char, std::pair<unsigned int, unsigned int> > charToIndex_;

  static QFont qfont_;

  static GLuint texture_;

  static int imageWidth_;

  static int imageHeight_;

  static QFontMetrics fontMetric_;

  static const int numberOfChars_ = 94;

  static const unsigned int rows_ = 10;

  static const unsigned int columns_ = 10;

  static bool initialised_;

  static QColor color_;
};

//=============================================================================
} // namespace SceneGraph
} // namespace ACG
//=============================================================================
#endif // ACG_TEXTNODE_HH defined
//=============================================================================