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_