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revision 36530, Mon Nov 8 10:24:42 2010 UTC revision 37721, Wed Jan 5 17:42:56 2011 UTC
# Line 36  Line 36 
36  //______________________________________________________________________________  //______________________________________________________________________________
37  /* Begin_Html  /* Begin_Html
38  <center><h2>TMultiGraph class</h2></center>  <center><h2>TMultiGraph class</h2></center>
39  A TMultiGraph is a collection of TGraph (or derived) objects  
40  Use <tt>TMultiGraph::Add</tt> to add a new graph to the list.  A TMultiGraph is a collection of TGraph (or derived) objects. It allows to
41    manipulate a set of graphs as a single entity. In particular, when drawn,
42    the X and Y axis ranges are automatically computed such as all the graphs
43    will be visible.
44    <p>
45    <tt>TMultiGraph::Add</tt> should be used to add a new graph to the list.
46    <p>
47  The TMultiGraph owns the objects in the list.  The TMultiGraph owns the objects in the list.
48  Drawing options are the same as for TGraph.  <p>
49    The drawing options are the same as for TGraph.
50    Like for TGraph, the painting is performed thanks to the
51    <a href="http://root.cern.ch/root/html/TGraphPainter.html">TGraphPainter</a>
52    class. All details about the various painting options are given in
53    <a href="http://root.cern.ch/root/html/TGraphPainter.html">this class</a>.
54  <p>  <p>
55  Example:  Example:
56  <pre>  <pre>
# Line 50  Line 61 
61       mg->Add(gr2,"cp");       mg->Add(gr2,"cp");
62       mg->Draw("a");       mg->Draw("a");
63  </pre>  </pre>
64    <br>
65  The drawing option for each TGraph may be specified as an optional  The drawing option for each TGraph may be specified as an optional
66  second argument of the Add function.  second argument of the <tt>Add</tt> function.
67    <p>
68  If a draw option is specified, it will be used to draw the graph,  If a draw option is specified, it will be used to draw the graph,
69  otherwise the graph will be drawn with the option specified in  otherwise the graph will be drawn with the option specified in
70  <tt>TMultiGraph::Draw</tt>.  <tt>TMultiGraph::Draw</tt>.
71    <p>
72    The following example shows how to fit a TMultiGraph.
73    End_Html
74    Begin_Macro(source)
75    {
76       TCanvas *c1 = new TCanvas("c1","c1",600,400);
77    
78       Double_t x1[2]  = {2.,4.};
79       Double_t dx1[2] = {0.1,0.1};
80       Double_t y1[2]  = {2.1,4.0};
81       Double_t dy1[2] = {0.3,0.2};
82    
83       Double_t x2[2]  = {3.,5.};
84       Double_t dx2[2] = {0.1,0.1};
85       Double_t y2[2]  = {3.2,4.8};
86       Double_t dy2[2] = {0.3,0.2};
87    
88       gStyle->SetOptFit(0001);
89    
90       TGraphErrors *g1 = new TGraphErrors(2,x1,y1,dx1,dy1);
91       g1->SetMarkerStyle(21);
92       g1->SetMarkerColor(2);
93    
94       TGraphErrors *g2 = new TGraphErrors(2,x2,y2,dx2,dy2);
95       g2->SetMarkerStyle(22);
96       g2->SetMarkerColor(3);
97    
98       TMultiGraph *g = new TMultiGraph();
99       g->Add(g1);
100       g->Add(g2);
101    
102       g->Draw("AP");
103    
104       g->Fit("pol1","FQ");
105       return c1;
106    }
107    End_Macro
108    Begin_Html
109    <p>
110    The axis titles can be modified the following way:
111    <p>
112    <pre>
113       [...]
114       TMultiGraph *mg = new TMultiGraph;
115       mg->SetTitle("title;xaxis title; yaxis title");
116       mg->Add(g1);
117       mg->Add(g2);
118       mg->Draw("apl");
119    </pre>
120    
121  End_Html */  End_Html */
122    
123    
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