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Reference Guide
TGeoPolygon.h
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1// @(#)root/geom:$Id$
2// Author: Mihaela Gheata 05/01/04
3
4/*************************************************************************
5 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
6 * All rights reserved. *
7 * *
8 * For the licensing terms see $ROOTSYS/LICENSE. *
9 * For the list of contributors see $ROOTSYS/README/CREDITS. *
10 *************************************************************************/
11
12#ifndef ROOT_TGeoPolygon
13#define ROOT_TGeoPolygon
14
15#include "TObject.h"
16
17class TObjArray;
18
19class TGeoPolygon : public TObject
20{
21public:
22 enum {
25 kGeoACW = BIT(11)
26 };
27protected :
28// data members
29 Int_t fNvert{0}; // number of vertices (must be defined clockwise in XY plane)
30 Int_t fNconvex{0}; // number of points of the outscribed convex polygon
31 Int_t *fInd{nullptr}; //[fNvert] list of vertex indices
32 Int_t *fIndc{nullptr}; //[fNconvex] indices of vertices of the outscribed convex polygon
33 Double_t *fX{nullptr}; //! pointer to list of current X coordinates of vertices
34 Double_t *fY{nullptr}; //! pointer to list of current Y coordinates of vertices
35 TObjArray *fDaughters{nullptr}; // list of concave daughters
36private:
37 void ConvexCheck(); // force convexity checking
38 Bool_t IsSegConvex(Int_t i1, Int_t i2=-1) const;
39 Bool_t IsRightSided(const Double_t *point, Int_t ind1, Int_t ind2) const;
40 void OutscribedConvex();
41
42 TGeoPolygon(const TGeoPolygon&) = delete;
44public:
45 // constructors
47 TGeoPolygon(Int_t nvert);
48 // destructor
49 virtual ~TGeoPolygon();
50 // methods
51 Double_t Area() const;
52 Bool_t Contains(const Double_t *point) const;
53 virtual void Draw(Option_t *option="");
54 void FinishPolygon();
55 Int_t GetNvert() const {return fNvert;}
56 Int_t GetNconvex() const {return fNconvex;}
57 Double_t *GetX() {return fX;}
58 Double_t *GetY() {return fY;}
59 void GetVertices(Double_t *x, Double_t *y) const;
60 void GetConvexVertices(Double_t *x, Double_t *y) const;
64 Bool_t IsIllegalCheck() const;
65 Double_t Safety(const Double_t *point, Int_t &isegment) const;
67 void SetXY(Double_t *x, Double_t *y);
68 void SetNextIndex(Int_t index=-1);
69
70 ClassDef(TGeoPolygon, 2) // class for handling arbitrary polygons
71};
72
73#endif
74
bool Bool_t
Definition: RtypesCore.h:63
int Int_t
Definition: RtypesCore.h:45
double Double_t
Definition: RtypesCore.h:59
const Bool_t kTRUE
Definition: RtypesCore.h:100
const char Option_t
Definition: RtypesCore.h:66
#define ClassDef(name, id)
Definition: Rtypes.h:335
#define BIT(n)
Definition: Rtypes.h:85
Option_t Option_t option
Option_t Option_t TPoint TPoint const char GetTextMagnitude GetFillStyle GetLineColor GetLineWidth GetMarkerStyle GetTextAlign GetTextColor GetTextSize void char Point_t Rectangle_t WindowAttributes_t index
An arbitrary polygon defined by vertices.
Definition: TGeoPolygon.h:20
Bool_t IsConvex() const
Definition: TGeoPolygon.h:62
Bool_t IsSegConvex(Int_t i1, Int_t i2=-1) const
Check if a segment [0..fNvert-1] belongs to the outscribed convex pgon.
TGeoPolygon & operator=(const TGeoPolygon &)=delete
TGeoPolygon()
Dummy constructor.
Definition: TGeoPolygon.cxx:65
Int_t GetNconvex() const
Definition: TGeoPolygon.h:56
Double_t * GetY()
Definition: TGeoPolygon.h:58
Double_t Safety(const Double_t *point, Int_t &isegment) const
Compute minimum distance from POINT to any segment. Returns segment index.
void SetXY(Double_t *x, Double_t *y)
Set X/Y array pointer for the polygon and daughters.
Bool_t IsFinished() const
Definition: TGeoPolygon.h:63
Double_t Area() const
Computes area of the polygon in [length^2].
Bool_t Contains(const Double_t *point) const
Check if a point given by X = point[0], Y = point[1] is inside the polygon.
Bool_t IsIllegalCheck() const
Check for illegal crossings between non-consecutive segments.
Int_t fNconvex
Definition: TGeoPolygon.h:30
void GetVertices(Double_t *x, Double_t *y) const
Fill list of vertices into provided arrays.
Int_t GetNvert() const
Definition: TGeoPolygon.h:55
void SetNextIndex(Int_t index=-1)
Sets the next polygone index.
Int_t * fInd
Definition: TGeoPolygon.h:31
virtual void Draw(Option_t *option="")
Draw the polygon.
virtual ~TGeoPolygon()
Destructor.
Double_t * fY
pointer to list of current X coordinates of vertices
Definition: TGeoPolygon.h:34
@ kGeoFinishPolygon
Definition: TGeoPolygon.h:24
Double_t * GetX()
Definition: TGeoPolygon.h:57
Bool_t IsClockwise() const
Definition: TGeoPolygon.h:61
void OutscribedConvex()
Compute indices for the outscribed convex polygon.
Double_t * fX
Definition: TGeoPolygon.h:33
Int_t * fIndc
Definition: TGeoPolygon.h:32
Bool_t IsRightSided(const Double_t *point, Int_t ind1, Int_t ind2) const
Check if POINT is right-sided with respect to the segment defined by IND1 and IND2.
Int_t fNvert
Definition: TGeoPolygon.h:29
void ConvexCheck()
Check polygon convexity.
TObjArray * fDaughters
pointer to list of current Y coordinates of vertices
Definition: TGeoPolygon.h:35
TGeoPolygon(const TGeoPolygon &)=delete
void GetConvexVertices(Double_t *x, Double_t *y) const
Fill list of vertices of the convex outscribed polygon into provided arrays.
void FinishPolygon()
Decompose polygon in a convex outscribed part and a list of daughter polygons that have to be subtrac...
void SetConvex(Bool_t flag=kTRUE)
Definition: TGeoPolygon.h:66
An array of TObjects.
Definition: TObjArray.h:31
Mother of all ROOT objects.
Definition: TObject.h:37
R__ALWAYS_INLINE Bool_t TestBit(UInt_t f) const
Definition: TObject.h:187
void SetBit(UInt_t f, Bool_t set)
Set or unset the user status bits as specified in f.
Definition: TObject.cxx:698
Double_t y[n]
Definition: legend1.C:17
Double_t x[n]
Definition: legend1.C:17