SoPolyLineScreenDrawer.h

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**=======================================================================*/
/*=======================================================================
** Author      : Thibaut Andrieu (Jan 2011)
**=======================================================================*/
 
#if !defined _SO_POLY_LINE_SCREEN_DRAWER_H_
#define _SO_POLY_LINE_SCREEN_DRAWER_H_
 
#include <Inventor/drawers/SoScreenDrawer.h>
#include <Inventor/fields/SoSFInt32.h>
#include <Inventor/fields/SoSFUShort.h>
#include <Inventor/fields/SoSFUInt32.h>
#include <Inventor/fields/SoSFColor.h>
#include <Inventor/fields/SoMFVec2f.h>
#include <Inventor/fields/SoSFBool.h>
#include <Inventor/fields/SoSFFloat.h>
#include <Inventor/SbEventHandler.h>
#include <Inventor/SbEventArg.h>
 
class  SoPolyLineScreenDrawer : public SoScreenDrawer 
{
  SO_NODE_HEADER( SoPolyLineScreenDrawer );
 
public:
  SoPolyLineScreenDrawer();
 
  SoSFUInt32 simplificationThreshold;
 
  SoSFBool doCCW;
 
  SoSFColor color;
 
  SoMFVec2f point;
 
  SoSFBool isClosed;
 
  SoSFUShort linePattern;
 
  SoSFInt32 linePatternScaleFactor;
 
  SoSFFloat lineWidth;
 
  struct EventArg : public SbEventArg
  {
    EventArg( SoHandleEventAction* action, SoPolyLineScreenDrawer* drawer )
    : m_action( action ), m_drawer( drawer )
    {}
 
    ~EventArg() { }
 
    SoHandleEventAction* getAction() const { return m_action; }
 
    SoPolyLineScreenDrawer* getSource() const { return m_drawer; }
 
  private:
    SoHandleEventAction* m_action;
 
    SoPolyLineScreenDrawer* m_drawer;
  };
 
  SbEventHandler<const EventArg&> onStart;
 
  SbEventHandler<const EventArg&> onMove;
 
  SbEventHandler<EventArg&> onFinish;
 
  virtual void clear() { point.deleteValues(0); }
 
  virtual void reset();
 
private:
 
  static void initClass();
 
  static void exitClass();
 
  void addPoint( const SbVec2f& point );
 
  void removePoint( unsigned id );
 
  void setPoint( unsigned id, const SbVec2f& newPoint);
 
  void finalize( SoHandleEventAction* action );
 
private:
 
  virtual ~SoPolyLineScreenDrawer();
 
private:
 
  static void simplify( std::vector<SbVec2f>& polyline, float epsilon );
 
  static bool isCCW( const std::vector<SbVec2f>& polyline );
 
  static void makeCCW( std::vector<SbVec2f>& polyline );
 
private:
 
  SoSeparator* m_lineRoot;
 
  // Engine used to convert from MFVec2 to MFVec3. it is used only internally by 
  // this class to draw line in screen space and should not be used by everyone 
  // else, so it is defined in in SoPolyLineScreenDrawer.cxx file.
 
  class MFVec2ToMFVec3;
  MFVec2ToMFVec3* m_vec2ToVec3;
};
 
 
#endif // _SO_POLY_LINE_SCREEN_DRAWER_H_