SoEllipseScreenDrawer.h

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**=======================================================================*/
/*=======================================================================
** Author      : Thibaut Andrieu (Jan 2011)
**=======================================================================*/
 
#if !defined _SO_ELLIPSE_SCREEN_DRAWER_H_
#define _SO_ELLIPSE_SCREEN_DRAWER_H_
 
 
#include <Inventor/drawers/SoPolyLineScreenDrawer.h>
#include <Inventor/fields/SoSFEnum.h>

class  SoEllipseScreenDrawer : public SoPolyLineScreenDrawer 
{
  SO_NODE_HEADER( SoEllipseScreenDrawer );
 
public:
  SoEllipseScreenDrawer();

  enum CreationMethod
  {
    CORNER_CORNER,
    CENTER_CORNER
  };

  SoSFEnum method;

  SoSFUInt32 nbPoint;

  virtual void reset();
 
private:

  static void initClass();

  static void exitClass();
 
SoEXTENDER_Documented private:

  virtual void onKeyDown( SoHandleEventAction* action );

  virtual void onMouseDragging( SoHandleEventAction* action );

  virtual void onMouseDown( SoHandleEventAction* action );

  virtual void onMouseUp( SoHandleEventAction* action );

  inline bool isCreating() const { return m_initPoint[0] != -1 && m_initPoint[1] != -1; }
 
private:

  virtual ~SoEllipseScreenDrawer();
 
private:

  void getEllipseParameters( const SbVec2f& currentPoint, 
    float& xRadius, 
    float& yRadius, 
    SbVec2f& center ) const;

  SbVec2f m_initPoint;
 
};
 
 
#endif // _SO_ELLIPSE_SCREEN_DRAWER_H_