A TCutG object is a closed polygon defining a closed region in a x,y plot. It can be created via the graphics editor option "CutG" or directly by invoking its constructor. The first and last points should be the same.
To create a TCutG via the graphics editor, use the left button to select the points building the contour of the cut. Click on the right button to close the TCutG. When it is created via the graphics editor, the TCutG object is named "CUTG". It is recommended to immediatly change the name by using the context menu item "SetName". When the graphics editor is used, the names of the variables X,Y are automatically taken from the current pad title.
Example:
Assume a TTree object T and:
Root > T.Draw("abs(fMomemtum)%fEtot")the TCutG members fVarX, fVary will be set to:
fVarx = fEtot fVary = abs(fMomemtum)A graphical cut can be used in a TTree selection expression:
Root > T.Draw("fEtot","cutg1")where "cutg1" is the name of an existing graphical cut.
Note that, as shown in the example above, a graphical cut may be used in a selection expression when drawing TTrees expressions of 1-d, 2-d or 3-dimensions. The expressions used in TTree::Draw can reference the variables in the fVarX, fVarY of the graphical cut plus other variables.
When the TCutG object is created, it is added to the list of special objects in the main TROOT object pointed by gROOT. To retrieve a pointer to this object from the code or command line, do:
TCutG *mycutg; mycutg = (TCutG*)gROOT->GetListOfSpecials()->FindObject("CUTG") mycutg->SetName("mycutg");Example of use of a TCutG in TTree::Draw:
tree.Draw("x:y","mycutg && z>0 %% sqrt(x)>1")
A Graphical cut may be drawn via TGraph::Draw. It can be edited like a normal TGraph.
A Graphical cut may be saved to a file via TCutG::Write.
TCutG() | |
TCutG(const TCutG& cutg) | |
TCutG(const char* name, Int_t n) | |
TCutG(const char* name, Int_t n, const Float_t* x, const Float_t* y) | |
TCutG(const char* name, Int_t n, const Double_t* x, const Double_t* y) | |
virtual | ~TCutG() |
void | TObject::AbstractMethod(const char* method) const |
virtual void | TObject::AppendPad(Option_t* option = "") |
virtual void | TGraph::Apply(TF1* f) |
virtual void | TGraph::Browse(TBrowser* b) |
virtual Double_t | TGraph::Chisquare(const TF1* f1) const |
static TClass* | Class() |
virtual const char* | TObject::ClassName() const |
virtual void | TNamed::Clear(Option_t* option = "") |
virtual TObject* | TNamed::Clone(const char* newname = "") const |
virtual Int_t | TNamed::Compare(const TObject* obj) const |
static Bool_t | TGraph::CompareArg(const TGraph* gr, Int_t left, Int_t right) |
static Bool_t | TGraph::CompareRadius(const TGraph* gr, Int_t left, Int_t right) |
static Bool_t | TGraph::CompareX(const TGraph* gr, Int_t left, Int_t right) |
static Bool_t | TGraph::CompareY(const TGraph* gr, Int_t left, Int_t right) |
virtual void | TGraph::ComputeRange(Double_t& xmin, Double_t& ymin, Double_t& xmax, Double_t& ymax) const |
virtual void | TNamed::Copy(TObject& named) const |
virtual void | TObject::Delete(Option_t* option = "")MENU |
Int_t | TAttLine::DistancetoLine(Int_t px, Int_t py, Double_t xp1, Double_t yp1, Double_t xp2, Double_t yp2) |
virtual Int_t | TGraph::DistancetoPrimitive(Int_t px, Int_t py) |
virtual void | TGraph::Draw(Option_t* chopt = "") |
virtual void | TObject::DrawClass() constMENU |
virtual TObject* | TObject::DrawClone(Option_t* option = "") constMENU |
virtual void | TGraph::DrawGraph(Int_t n, const Int_t* x, const Int_t* y, Option_t* option = "") |
virtual void | TGraph::DrawGraph(Int_t n, const Float_t* x, const Float_t* y, Option_t* option = "") |
virtual void | TGraph::DrawGraph(Int_t n, const Double_t* x = 0, const Double_t* y = 0, Option_t* option = "") |
virtual void | TGraph::DrawPanel()MENU |
virtual void | TObject::Dump() constMENU |
virtual void | TObject::Error(const char* method, const char* msgfmt) const |
virtual Double_t | TGraph::Eval(Double_t x, TSpline* spline = 0, Option_t* option = "") const |
virtual void | TObject::Execute(const char* method, const char* params, Int_t* error = 0) |
virtual void | TObject::Execute(TMethod* method, TObjArray* params, Int_t* error = 0) |
virtual void | TGraph::ExecuteEvent(Int_t event, Int_t px, Int_t py) |
virtual void | TGraph::Expand(Int_t newsize) |
virtual void | TGraph::Expand(Int_t newsize, Int_t step) |
virtual void | TObject::Fatal(const char* method, const char* msgfmt) const |
virtual void | TNamed::FillBuffer(char*& buffer) |
virtual TObject* | TGraph::FindObject(const char* name) const |
virtual TObject* | TGraph::FindObject(const TObject* obj) const |
virtual Int_t | TGraph::Fit(const char* formula, Option_t* option = "", Option_t* goption = "", Axis_t xmin = 0, Axis_t xmax = 0)MENU |
virtual Int_t | TGraph::Fit(TF1* f1, Option_t* option = "", Option_t* goption = "", Axis_t xmin = 0, Axis_t xmax = 0)MENU |
virtual void | TGraph::FitPanel()MENU |
virtual Double_t | TGraph::GetCorrelationFactor() const |
virtual Double_t | TGraph::GetCovariance() const |
virtual Option_t* | TObject::GetDrawOption() const |
static Long_t | TObject::GetDtorOnly() |
Bool_t | TGraph::GetEditable() const |
virtual Double_t | TGraph::GetErrorX(Int_t bin) const |
virtual Double_t | TGraph::GetErrorXhigh(Int_t bin) const |
virtual Double_t | TGraph::GetErrorXlow(Int_t bin) const |
virtual Double_t | TGraph::GetErrorY(Int_t bin) const |
virtual Double_t | TGraph::GetErrorYhigh(Int_t bin) const |
virtual Double_t | TGraph::GetErrorYlow(Int_t bin) const |
virtual Double_t* | TGraph::GetEX() const |
virtual Double_t* | TGraph::GetEXhigh() const |
virtual Double_t* | TGraph::GetEXhighd() const |
virtual Double_t* | TGraph::GetEXlow() const |
virtual Double_t* | TGraph::GetEXlowd() const |
virtual Double_t* | TGraph::GetEY() const |
virtual Double_t* | TGraph::GetEYhigh() const |
virtual Double_t* | TGraph::GetEYhighd() const |
virtual Double_t* | TGraph::GetEYlow() const |
virtual Double_t* | TGraph::GetEYlowd() const |
virtual Color_t | TAttFill::GetFillColor() const |
virtual Style_t | TAttFill::GetFillStyle() const |
TF1* | TGraph::GetFunction(const char* name) const |
TH1F* | TGraph::GetHistogram() const |
virtual const char* | TObject::GetIconName() const |
virtual Color_t | TAttLine::GetLineColor() const |
virtual Style_t | TAttLine::GetLineStyle() const |
virtual Width_t | TAttLine::GetLineWidth() const |
TList* | TGraph::GetListOfFunctions() const |
virtual Color_t | TAttMarker::GetMarkerColor() const |
virtual Size_t | TAttMarker::GetMarkerSize() const |
virtual Style_t | TAttMarker::GetMarkerStyle() const |
Double_t | TGraph::GetMaximum() const |
Int_t | TGraph::GetMaxSize() const |
virtual Double_t | TGraph::GetMean(Int_t axis = 1) const |
Double_t | TGraph::GetMinimum() const |
Int_t | TGraph::GetN() const |
virtual const char* | TNamed::GetName() const |
virtual char* | TObject::GetObjectInfo(Int_t px, Int_t py) const |
static Bool_t | TObject::GetObjectStat() |
TObject* | GetObjectX() const |
TObject* | GetObjectY() const |
virtual Option_t* | TObject::GetOption() const |
virtual void | TGraph::GetPoint(Int_t i, Double_t& x, Double_t& y) const |
virtual Double_t | TGraph::GetRMS(Int_t axis = 1) const |
virtual const char* | TNamed::GetTitle() const |
virtual UInt_t | TObject::GetUniqueID() const |
const char* | GetVarX() const |
const char* | GetVarY() const |
Double_t* | TGraph::GetX() const |
TAxis* | TGraph::GetXaxis() const |
Double_t* | TGraph::GetY() const |
TAxis* | TGraph::GetYaxis() const |
virtual Bool_t | TObject::HandleTimer(TTimer* timer) |
virtual ULong_t | TNamed::Hash() const |
virtual void | TObject::Info(const char* method, const char* msgfmt) const |
virtual Bool_t | TObject::InheritsFrom(const char* classname) const |
virtual Bool_t | TObject::InheritsFrom(const TClass* cl) const |
virtual void | TGraph::InitExpo(Double_t xmin = 0, Double_t xmax = 0) |
virtual void | TGraph::InitGaus(Double_t xmin = 0, Double_t xmax = 0) |
virtual void | TGraph::InitPolynom(Double_t xmin = 0, Double_t xmax = 0) |
virtual Int_t | TGraph::InsertPoint()MENU |
virtual void | TObject::Inspect() constMENU |
Double_t | Integral(TH2* h, Option_t* option = "") const |
void | TObject::InvertBit(UInt_t f) |
virtual TClass* | IsA() const |
virtual Bool_t | TGraph::IsEditable() const |
virtual Bool_t | TObject::IsEqual(const TObject* obj) const |
virtual Bool_t | TObject::IsFolder() const |
virtual Int_t | IsInside(Double_t x, Double_t y) const |
Bool_t | TObject::IsOnHeap() const |
virtual Bool_t | TNamed::IsSortable() const |
virtual Bool_t | TAttFill::IsTransparent() const |
Bool_t | TObject::IsZombie() const |
virtual void | TGraph::LeastSquareFit(Int_t m, Double_t* a, Double_t xmin = 0, Double_t xmax = 0) |
virtual void | TGraph::LeastSquareLinearFit(Int_t n, Double_t& a0, Double_t& a1, Int_t& ifail, Double_t xmin = 0, Double_t xmax = 0) |
virtual void | TNamed::ls(Option_t* option = "") const |
void | TObject::MayNotUse(const char* method) const |
virtual Int_t | TGraph::Merge(TCollection* list) |
virtual void | TAttLine::Modify() |
virtual Bool_t | TObject::Notify() |
static void | TObject::operator delete(void* ptr) |
static void | TObject::operator delete(void* ptr, void* vp) |
static void | TObject::operator delete[](void* ptr) |
static void | TObject::operator delete[](void* ptr, void* vp) |
void* | TObject::operator new(size_t sz) |
void* | TObject::operator new(size_t sz, void* vp) |
void* | TObject::operator new[](size_t sz) |
void* | TObject::operator new[](size_t sz, void* vp) |
TCutG& | operator=(const TCutG&) |
virtual void | TGraph::Paint(Option_t* chopt = "") |
void | TGraph::PaintGraph(Int_t npoints, const Double_t* x, const Double_t* y, Option_t* chopt) |
void | TGraph::PaintGrapHist(Int_t npoints, const Double_t* x, const Double_t* y, Option_t* chopt) |
virtual void | TGraph::PaintStats(TF1* fit) |
virtual void | TObject::Pop() |
virtual void | TGraph::Print(Option_t* chopt = "") const |
virtual Int_t | TObject::Read(const char* name) |
virtual void | TGraph::RecursiveRemove(TObject* obj) |
virtual Int_t | TGraph::RemovePoint()MENU |
virtual Int_t | TGraph::RemovePoint(Int_t ipoint) |
virtual void | TAttFill::ResetAttFill(Option_t* option = "") |
virtual void | TAttLine::ResetAttLine(Option_t* option = "") |
virtual void | TAttMarker::ResetAttMarker(Option_t* toption = "") |
void | TObject::ResetBit(UInt_t f) |
virtual void | TObject::SaveAs(const char* filename = "", Option_t* option = "") constMENU |
virtual void | TAttFill::SaveFillAttributes(ostream& out, const char* name, Int_t coldef = 1, Int_t stydef = 1001) |
virtual void | TAttLine::SaveLineAttributes(ostream& out, const char* name, Int_t coldef = 1, Int_t stydef = 1, Int_t widdef = 1) |
virtual void | TAttMarker::SaveMarkerAttributes(ostream& out, const char* name, Int_t coldef = 1, Int_t stydef = 1, Int_t sizdef = 1) |
virtual void | SavePrimitive(ostream& out, Option_t* option = "") |
virtual void | TGraph::Set(Int_t n) |
void | TObject::SetBit(UInt_t f) |
void | TObject::SetBit(UInt_t f, Bool_t set) |
virtual void | TObject::SetDrawOption(Option_t* option = "")MENU |
static void | TObject::SetDtorOnly(void* obj) |
virtual void | TGraph::SetEditable(Bool_t editable = kTRUE)TOGGLE GETTER |
virtual void | TAttFill::SetFillAttributes()MENU |
virtual void | TAttFill::SetFillColor(Color_t fcolor) |
virtual void | TAttFill::SetFillStyle(Style_t fstyle) |
virtual void | TGraph::SetHistogram(TH1* h) |
virtual void | TAttLine::SetLineAttributes()MENU |
virtual void | TAttLine::SetLineColor(Color_t lcolor) |
virtual void | TAttLine::SetLineStyle(Style_t lstyle) |
virtual void | TAttLine::SetLineWidth(Width_t lwidth) |
virtual void | TAttMarker::SetMarkerAttributes()MENU |
virtual void | TAttMarker::SetMarkerColor(Color_t tcolor = 1) |
virtual void | TAttMarker::SetMarkerSize(Size_t msize = 1) |
virtual void | TAttMarker::SetMarkerStyle(Style_t mstyle = 1) |
virtual void | TGraph::SetMaximum(Double_t maximum = -1111)MENU |
virtual void | TGraph::SetMinimum(Double_t minimum = -1111)MENU |
virtual void | TNamed::SetName(const char* name)MENU |
virtual void | TNamed::SetNameTitle(const char* name, const char* title) |
static void | TObject::SetObjectStat(Bool_t stat) |
virtual void | SetObjectX(TObject* obj) |
virtual void | SetObjectY(TObject* obj) |
virtual void | TGraph::SetPoint(Int_t i, Double_t x, Double_t y) |
virtual void | TGraph::SetTitle(const char* title = "")MENU |
virtual void | TObject::SetUniqueID(UInt_t uid) |
virtual void | SetVarX(const char* varx)MENU |
virtual void | SetVarY(const char* vary)MENU |
virtual void | ShowMembers(TMemberInspector& insp, char* parent) |
virtual Int_t | TNamed::Sizeof() const |
virtual void | TGraph::Sort(Bool_t (*)(const TGraph*, Int_t, Int_t) greater = &TGraph::CompareX, Bool_t ascending = kTRUE, Int_t low = 0, Int_t high = -1111) |
virtual void | Streamer(TBuffer& b) |
void | StreamerNVirtual(TBuffer& b) |
virtual void | TObject::SysError(const char* method, const char* msgfmt) const |
Bool_t | TObject::TestBit(UInt_t f) const |
Int_t | TObject::TestBits(UInt_t f) const |
virtual void | TGraph::UseCurrentStyle() |
virtual void | TObject::Warning(const char* method, const char* msgfmt) const |
virtual Int_t | TObject::Write(const char* name = 0, Int_t option = 0, Int_t bufsize = 0) |
virtual Int_t | TObject::Write(const char* name = 0, Int_t option = 0, Int_t bufsize = 0) const |
void | TGraph::Zero(Int_t& k, Double_t AZ, Double_t BZ, Double_t E2, Double_t& X, Double_t& Y, Int_t maxiterations) |
virtual Double_t** | TGraph::Allocate(Int_t newsize) |
Double_t** | TGraph::AllocateArrays(Int_t Narrays, Int_t arraySize) |
virtual void | TGraph::CopyAndRelease(Double_t** newarrays, Int_t ibegin, Int_t iend, Int_t obegin) |
virtual Bool_t | TGraph::CopyPoints(Double_t** newarrays, Int_t ibegin, Int_t iend, Int_t obegin) |
Bool_t | TGraph::CtorAllocate() |
virtual void | TObject::DoError(int level, const char* location, const char* fmt, va_list va) const |
Double_t** | TGraph::ExpandAndCopy(Int_t size, Int_t iend) |
virtual void | TGraph::FillZero(Int_t begin, Int_t end, Bool_t from_ctor = kTRUE) |
void | TObject::MakeZombie() |
Double_t** | TGraph::ShrinkAndCopy(Int_t size, Int_t iend) |
virtual void | TGraph::SwapPoints(Int_t pos1, Int_t pos2) |
static void | TGraph::SwapValues(Double_t* arr, Int_t pos1, Int_t pos2) |
enum TGraph::[unnamed] { | kClipFrame | |
kNotEditable | ||
}; | ||
enum TObject::EStatusBits { | kCanDelete | |
kMustCleanup | ||
kObjInCanvas | ||
kIsReferenced | ||
kHasUUID | ||
kCannotPick | ||
kNoContextMenu | ||
kInvalidObject | ||
}; | ||
enum TObject::[unnamed] { | kIsOnHeap | |
kNotDeleted | ||
kZombie | ||
kBitMask | ||
kSingleKey | ||
kOverwrite | ||
kWriteDelete | ||
}; |
Color_t | TAttFill::fFillColor | fill area color |
Style_t | TAttFill::fFillStyle | fill area style |
TList* | TGraph::fFunctions | Pointer to list of functions (fits and user) |
TH1F* | TGraph::fHistogram | Pointer to histogram used for drawing axis |
Color_t | TAttLine::fLineColor | line color |
Style_t | TAttLine::fLineStyle | line style |
Width_t | TAttLine::fLineWidth | line width |
Color_t | TAttMarker::fMarkerColor | Marker color index |
Size_t | TAttMarker::fMarkerSize | Marker size |
Style_t | TAttMarker::fMarkerStyle | Marker style |
Int_t | TGraph::fMaxSize | !Current dimension of arrays fX and fY |
Double_t | TGraph::fMaximum | Maximum value for plotting along y |
Double_t | TGraph::fMinimum | Minimum value for plotting along y |
TString | TNamed::fName | object identifier |
Int_t | TGraph::fNpoints | Number of points <= fMaxSize |
TObject* | fObjectX | !pointer to an object corresponding to X |
TObject* | fObjectY | !pointer to an object corresponding to Y |
TString | TNamed::fTitle | object title |
TString | fVarX | X variable |
TString | fVarY | Y variable |
Double_t* | TGraph::fX | [fNpoints] array of X points |
Double_t* | TGraph::fY | [fNpoints] array of Y points |
Compute the integral of 2-d histogram h for all bins inside the cut
if option "width" is specified, the integral is the sum of
the bin contents multiplied by the bin width in x and in y.
Function which returns 1 if point x,y lies inside the polygon defined by the graph points 0 otherwise. This function assumes that the first and the last point of the TCutG are the same (closed polygon). Algorithm: The loop is executed with the end-point coordinates of a line segment (X1,Y1)-(X2,Y2) and the Y-coordinate of a horizontal line. The counter inter is incremented if the line (X1,Y1)-(X2,Y2) intersects the horizontal line. In this case XINT is set to the X-coordinate of the intersection point. If inter is an odd number, then the point x,y is within the polygon. This function is based on an original algorithm developed by R.Nierhaus.
Save primitive as a C++ statement(s) on output stream out.