// @(#)root/graf:$Id$
// Author: Rene Brun   12/12/94

 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *

#ifndef ROOT_TLine
#define ROOT_TLine

//                                                                      //
// TLine                                                                //
//                                                                      //
// A line segment.                                                      //
//                                                                      //

#ifndef ROOT_TObject
#include "TObject.h"
#ifndef ROOT_TAttLine
#include "TAttLine.h"
#ifndef ROOT_TAttBBox2D
#include "TAttBBox2D.h"
#ifndef ROOT_TPoint
#include "TPoint.h"
#ifndef ROOT_GuiTypes
#include "GuiTypes.h"

class TLine : public TObject, public TAttLine, public TAttBBox2D {

   Double_t      fX1;           //X of 1st point
   Double_t      fY1;           //Y of 1st point
   Double_t      fX2;           //X of 2nd point
   Double_t      fY2;           //Y of 2nd point

   // TLine status bits
   enum {
      kLineNDC    = BIT(14), // Use NDC coordinates
      kVertical   = BIT(15), // Line is vertical
      kHorizontal = BIT(16)  // Line is horizontal

   TLine(Double_t x1, Double_t y1,Double_t x2, Double_t  y2);
   TLine(const TLine &line);
   virtual ~TLine();

   void                 Copy(TObject &line) const;
   virtual Int_t        DistancetoPrimitive(Int_t px, Int_t py);
   virtual TLine       *DrawLine(Double_t x1, Double_t y1,Double_t x2, Double_t y2);
   virtual TLine       *DrawLineNDC(Double_t x1, Double_t y1,Double_t x2, Double_t y2);
   virtual void         ExecuteEvent(Int_t event, Int_t px, Int_t py);
   Double_t             GetX1() const {return fX1;}
   Double_t             GetX2() const {return fX2;}
   Double_t             GetY1() const {return fY1;}
   Double_t             GetY2() const {return fY2;}
   Bool_t               IsHorizontal();
   Bool_t               IsVertical();
   virtual void         ls(Option_t *option="") const;
   virtual void         Paint(Option_t *option="");
   virtual void         PaintLine(Double_t x1, Double_t y1,Double_t x2, Double_t  y2);
   virtual void         PaintLineNDC(Double_t u1, Double_t v1,Double_t u2, Double_t  v2);
   virtual void         Print(Option_t *option="") const;
   virtual void         SavePrimitive(std::ostream &out, Option_t *option = "");
   virtual void         SetNDC(Bool_t isNDC=kTRUE);
   void                 SetHorizontal(Bool_t set = kTRUE); // *TOGGLE* *GETTER=IsHorizontal
   void                 SetVertical(Bool_t set = kTRUE); // *TOGGLE* *GETTER=IsVertical
   virtual void         SetX1(Double_t x1) {fX1=x1;}
   virtual void         SetX2(Double_t x2) {fX2=x2;}
   virtual void         SetY1(Double_t y1) {fY1=y1;}
   virtual void         SetY2(Double_t y2) {fY2=y2;}
   virtual Rectangle_t  GetBBox();
   virtual TPoint       GetBBoxCenter();
   virtual void         SetBBoxCenter(const TPoint &p);
   virtual void         SetBBoxCenterX(const Int_t x);
   virtual void         SetBBoxCenterY(const Int_t y);
   virtual void         SetBBoxX1(const Int_t x);
   virtual void         SetBBoxX2(const Int_t x);
   virtual void         SetBBoxY1(const Int_t y);
   virtual void         SetBBoxY2(const Int_t y);

   ClassDef(TLine,3)  //A line segment