#ifndef _OPCONSTRUCTRECTANGLE_H
#define _OPCONSTRUCTRECTANGLE_H

#include "OBaseOperator.h"

//interface of the HOpConstruction class
// draws a 2D box in view port based on pointer first position and last position
// Derived classes access the Points for the rectangle in HBaseOperator members
// m_ptFirst and m_ptLast; Points are stored in window space.

namespace OSGView
{

class OpConstructRectangle : public OBaseOperator
{
public:
	OpConstructRectangle();
	OpConstructRectangle(osgViewer::Viewer* pViewer);
	virtual ~OpConstructRectangle();

	/*!
		\returns A pointer to a character string denoting the name of the operator which is 'Construct Rectangle'.
	*/
	virtual const char * GetName() {return "OpConstructRectangle";}  

	/*!
		OnLButtonDown records the first mouse position and initiates the rectangle-drawing mechanism.
		\param hevent An GUIEventAdapter object containing information about the current event.
	  \return An #HOperatorReturn indicating the status of the event.
	*/
	virtual int OnLButtonDown(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa);


	/*!
		OnLButtonDownAndMove draws a rubberbanded line from the first point in the rectangle to the current mouse position. 
		Note that the basic drawing work is done by HUtility::InsertRectangle, while OnLButtonDownAndMove keeps track of 
		the current points and draws the rubberband centroid.
		\param hevent An GUIEventAdapter object containing information about the current event.  
	  \return An #HOperatorReturn indicating the status of the event.
	*/
	virtual int OnLButtonDownAndMove(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa);


	/*!
		OnLButtonUp finalizes the size of the rectangle and cleans up.
		\param hevent An GUIEventAdapter object containing information about the current event.
	  \return An #HOperatorReturn indicating the status of the event.
	*/
	virtual int OnLButtonUp(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa); 


	osg::Vec3 GetRectangleStartPt() const {return m_ptRectangle[0];}
	osg::Vec3 GetRectangleEndPt() const {return m_ptRectangle[1];}

	bool GetRectangleExistFlag() {return m_bRectangleExists;}

protected:

	virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa);

protected:

	bool      m_bRectangleExists;  /*!< The boolean indicating whether the rectangle exists. */
	osg::Vec3  m_ptRectangle[2];     /*!< The first and last points in the rectangle stored in window space. */

	osg::ref_ptr<osg::Group> m_ConstructLayer;    
};

}


#endif