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TF12.cxx
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1// @(#)root/hist:$Id$
2// Author: Rene Brun 05/04/2003
3
4/*************************************************************************
5 * Copyright (C) 1995-2003, 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#include "TF12.h"
13#include "TH1.h"
14#include "TVirtualPad.h"
15
17
18/** \class TF12
19 \ingroup Functions
20 A projection of a TF2 along X or Y
21
22It has the same behaviour as a TF1
23
24Example of a function
25
26~~~ {.cpp}
27 TF2 *f2 = new TF2("f2","sin(x)*sin(y)/(x*y)",0,5,0,5);
28 TF12 *f12 = new TF12("f12",f2,0.1,"y");
29 f12->Draw();
30~~~
31
32*/
33
34////////////////////////////////////////////////////////////////////////////////
35/// TF12 default constructor
36
38{
39 fCase = 0;
40 fF2 = 0;
41 fXY = 0;
42}
43
44
45////////////////////////////////////////////////////////////////////////////////
46/// TF12 normal constructor.
47///
48/// Create a TF12 (special TF1) from a projection of a TF2
49/// for a fix value of Y if option="X" or X if option="Y"
50/// This value may be changed at any time via TF12::SetXY(xy)
51
53 :TF1(name,"x",0,0)
54{
56 fF2 = f2;
57 TString opt=option;
58 opt.ToLower();
59 if (!f2) {
60 Error("TF12","Pointer to TF2 is null");
61 return;
62 }
63 SetXY(xy);
64 if (opt.Contains("y")) {
65 fXmin = f2->GetYmin();
66 fXmax = f2->GetYmax();
67 fCase = 1;
68 } else {
69 fXmin = f2->GetXmin();
70 fXmax = f2->GetXmax();
71 fCase = 0;
72 }
73}
74
75
76////////////////////////////////////////////////////////////////////////////////
77/// F2 default destructor.
78
80{
81}
82
83
84////////////////////////////////////////////////////////////////////////////////
85/// Copy constructor.
86
87TF12::TF12(const TF12 &f12) : TF1(f12)
88{
89 ((TF12&)f12).Copy(*this);
90}
91
92
93////////////////////////////////////////////////////////////////////////////////
94/// Copy this F2 to a new F2.
95
96void TF12::Copy(TObject &obj) const
97{
98 TF1::Copy(obj);
99 ((TF12&)obj).fXY = fXY;
100 ((TF12&)obj).fCase = fCase;
101 ((TF12&)obj).fF2 = fF2;
102}
103
104
105////////////////////////////////////////////////////////////////////////////////
106/// Draw a copy of this function with its current attributes.
107///
108/// This function MUST be used instead of Draw when you want to draw
109/// the same function with different parameters settings in the same canvas.
110///
111/// Possible option values are:
112///
113/// option | description
114/// -------|----------------------------------------
115/// "SAME" | superimpose on top of existing picture
116/// "L" | connect all computed points with a straight line
117/// "C" | connect all computed points with a smooth curve
118///
119/// Note that the default value is "F". Therefore to draw on top
120/// of an existing picture, specify option "SL"
121
123{
124 TF12 *newf2 = new TF12();
125 Copy(*newf2);
126 newf2->AppendPad(option);
127 newf2->SetBit(kCanDelete);
128 return newf2;
129}
130
131
132////////////////////////////////////////////////////////////////////////////////
133/// Evaluate this formula
134///
135/// Computes the value of the referenced TF2 for a fix value of X or Y
136
138{
139 if (!fF2) return 0;
140 if (fCase == 0) {
141 return fF2->Eval(x,fXY,0);
142 } else {
143 return fF2->Eval(fXY,x,0);
144 }
145}
146
147
148////////////////////////////////////////////////////////////////////////////////
149/// Evaluate this function at point x[0]
150///
151/// x[0] is the value along X if fCase =0, the value along Y if fCase=1
152/// if params is non null, the array will be used instead of the internal TF2
153/// parameters
154
156{
157 if (!fF2) return 0;
158 Double_t xx[2];
159 if (fCase == 0) {
160 xx[0] = x[0];
161 xx[1] = fXY;
162 } else {
163 xx[0] = fXY;
164 xx[1] = x[0];
165 }
166 fF2->InitArgs(xx,params);
167 return fF2->EvalPar(xx,params);
168}
169
170
171////////////////////////////////////////////////////////////////////////////////
172/// Save primitive as a C++ statement(s) on output stream out
173
174void TF12::SavePrimitive(std::ostream & /*out*/, Option_t * /*option*/ /*= ""*/)
175{
176 Error("SavePrimitive","Function not yet implemented");
177}
178
179
180////////////////////////////////////////////////////////////////////////////////
181/// Set the value of the constant for the TF2
182///
183/// constant in X when projecting along Y
184/// constant in Y when projecting along X
185/// The function title is set to include the value of the constant
186/// The current pad is updated
187
189{
190 fXY = xy;
191 if (!fF2) return;
192 if (fCase == 0) SetTitle(Form("%s (y=%g)",fF2->GetTitle(),xy));
193 else SetTitle(Form("%s (x=%g)",fF2->GetTitle(),xy));
195 if (gPad) gPad->Modified();
196}
const char Option_t
Definition: RtypesCore.h:66
#define ClassImp(name)
Definition: Rtypes.h:375
Option_t Option_t option
Option_t Option_t TPoint xy
char name[80]
Definition: TGX11.cxx:110
char * Form(const char *fmt,...)
Formats a string in a circular formatting buffer.
Definition: TString.cxx:2447
#define gPad
Definition: TVirtualPad.h:288
A projection of a TF2 along X or Y.
Definition: TF12.h:25
Int_t fCase
Projection along X(0), or Y(1)
Definition: TF12.h:29
Double_t fXY
Value along Y (if projection X) or X (if projection Y)
Definition: TF12.h:28
TF12()
TF12 default constructor.
Definition: TF12.cxx:37
Double_t EvalPar(const Double_t *x, const Double_t *params=0) override
Evaluate this function at point x[0].
Definition: TF12.cxx:155
void SavePrimitive(std::ostream &out, Option_t *option="") override
Save primitive as a C++ statement(s) on output stream out.
Definition: TF12.cxx:174
void Copy(TObject &f12) const override
Copy this F2 to a new F2.
Definition: TF12.cxx:96
~TF12() override
F2 default destructor.
Definition: TF12.cxx:79
virtual void SetXY(Double_t xy)
Set the value of the constant for the TF2.
Definition: TF12.cxx:188
TF1 * DrawCopy(Option_t *option="") const override
Draw a copy of this function with its current attributes.
Definition: TF12.cxx:122
TF2 * fF2
Pointer to the mother TF2.
Definition: TF12.h:30
Double_t Eval(Double_t x, Double_t y=0, Double_t z=0, Double_t t=0) const override
Evaluate this formula.
Definition: TF12.cxx:137
1-Dim function class
Definition: TF1.h:213
virtual Double_t GetXmax() const
Definition: TF1.h:561
Double_t fXmin
Lower bounds for the range.
Definition: TF1.h:243
TH1 * fHistogram
! Pointer to histogram used for visualisation
Definition: TF1.h:263
void SetTitle(const char *title="") override
Set function title if title has the form "fffffff;xxxx;yyyy", it is assumed that the function title i...
Definition: TF1.cxx:3592
void Copy(TObject &f1) const override
Copy this F1 to a new F1.
Definition: TF1.cxx:1014
virtual Double_t EvalPar(const Double_t *x, const Double_t *params=0)
Evaluate function with given coordinates and parameters.
Definition: TF1.cxx:1483
virtual void InitArgs(const Double_t *x, const Double_t *params)
Initialize parameters addresses.
Definition: TF1.cxx:2492
virtual Double_t Eval(Double_t x, Double_t y=0, Double_t z=0, Double_t t=0) const
Evaluate this function.
Definition: TF1.cxx:1454
Double_t fXmax
Upper bounds for the range.
Definition: TF1.h:244
virtual Double_t GetXmin() const
Definition: TF1.h:557
A 2-Dim function with parameters.
Definition: TF2.h:29
virtual Double_t GetYmax() const
Definition: TF2.h:114
virtual Double_t GetYmin() const
Definition: TF2.h:113
void SetTitle(const char *title) override
See GetStatOverflows for more information.
Definition: TH1.cxx:6708
const char * GetTitle() const override
Returns title of object.
Definition: TNamed.h:48
virtual void SetName(const char *name)
Set the name of the TNamed.
Definition: TNamed.cxx:140
Mother of all ROOT objects.
Definition: TObject.h:37
virtual void AppendPad(Option_t *option="")
Append graphics object to current pad.
Definition: TObject.cxx:107
void SetBit(UInt_t f, Bool_t set)
Set or unset the user status bits as specified in f.
Definition: TObject.cxx:696
virtual void Error(const char *method, const char *msgfmt,...) const
Issue error message.
Definition: TObject.cxx:893
@ kCanDelete
if object in a list can be deleted
Definition: TObject.h:58
Basic string class.
Definition: TString.h:136
void ToLower()
Change string to lower-case.
Definition: TString.cxx:1150
Bool_t Contains(const char *pat, ECaseCompare cmp=kExact) const
Definition: TString.h:624
Double_t x[n]
Definition: legend1.C:17