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revision 37721, Wed Jan 5 17:42:56 2011 UTC revision 37731, Thu Jan 6 16:02:12 2011 UTC
# Line 51  Line 51 
51  <a href="http://root.cern.ch/root/html/TGraphPainter.html">TGraphPainter</a>  <a href="http://root.cern.ch/root/html/TGraphPainter.html">TGraphPainter</a>
52  class. All details about the various painting options are given in  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>.  <a href="http://root.cern.ch/root/html/TGraphPainter.html">this class</a>.
 <p>  
54  Example:  Example:
55  <pre>  <pre>
56       TGraph *gr1 = new TGraph(...       TGraph *gr1 = new TGraph(...
# Line 61  Line 60 
60       mg->Add(gr2,"cp");       mg->Add(gr2,"cp");
61       mg->Draw("a");       mg->Draw("a");
62  </pre>  </pre>
63  <br>  <p>
64    The number of graphs in a multigraph can be retrieve with:
65    <pre>
66    mg->GetListOfGraphs()->GetSize();
67    </pre>
68    <p>
69  The drawing option for each TGraph may be specified as an optional  The drawing option for each TGraph may be specified as an optional
70  second argument of the <tt>Add</tt> function.  second argument of the <tt>Add</tt> function.
71  <p>  <p>
# Line 117  Line 121 
121     mg->Add(g2);     mg->Add(g2);
122     mg->Draw("apl");     mg->Draw("apl");
123  </pre>  </pre>
124    <p>
125    When the graphs in a TMultiGraph are fitted, the fit parameters boxes
126    overlap. The following example shows how to make them all visible.
127    
128    End_Html
129    Begin_Macro(source)
130    ../../../tutorials/graphs/multigraph.C
131    End_Macro
132    Begin_Html
133    
134    <p>
135    The axis limits can be changed the like for TGraph. The same methods apply on
136    the multigraph.
137    Note the two differents ways to change limits on X and Y axis.
138    
139    End_Html
140    Begin_Macro(source)
141    {
142       TCanvas *c2 = new TCanvas("c2","c2",600,400);
143    
144       TGraph *g[3];
145       Double_t x[10] = {0,1,2,3,4,5,6,7,8,9};
146       Double_t y[10] = {1,2,3,4,5,5,4,3,2,1};
147       TMultiGraph *mg = new TMultiGraph();
148       for (int i=0; i<3; i++) {
149          g[i] = new TGraph(10, x, y);
150          g[i]->SetMarkerStyle(20);
151          g[i]->SetMarkerColor(i+2);
152          for (int j=0; j<10; j++) y[j] = y[j]-1;
153          mg->Add(g[i]);
154       }
155       mg->Draw("APL");
156       mg->GetXaxis()->SetTitle("E_{#gamma} (GeV)");
157       mg->GetYaxis()->SetTitle("Coefficients");
158    
159       // Change the axis limits
160       gPad->Modified();
161       mg->GetXaxis()->SetLimits(1.5,7.5);
162       mg->SetMinimum(0.);
163       mg->SetMaximum(10.);
164    
165       return c2;
166    }
167    End_Macro
168    Begin_Html
169    <p>
170    The method <a href="http://root.cern.ch/root/html/TPad.html#TPad:BuildLegend">
171    <tt>TPad::BuildLegend</tt></a> is able to extract the graphs inside a
172    multigraph. The following example demonstrate this.
173    
174    End_Html
175    Begin_Macro(source)
176    {
177       TCanvas *c3 = new TCanvas("c3","c3",600, 400);
178    
179       TMultiGraph * mg = new TMultiGraph("mg","mg");
180    
181       const Int_t size = 10;
182    
183       double x[size];
184       double y1[size];
185       double y2[size];
186       double y3[size];
187    
188       for ( int i = 0; i <  size ; ++i ) {
189          x[i] = i;
190          y1[i] = size - i;
191          y2[i] = size - 0.5 * i;
192          y3[i] = size - 0.6 * i;
193       }
194    
195       TGraph * gr1 = new TGraph( size, x, y1 );
196       gr1->SetName("gr1");
197       gr1->SetTitle("graph 1");
198       gr1->SetMarkerStyle(21);
199       gr1->SetDrawOption("AP");
200       gr1->SetLineColor(2);
201       gr1->SetLineWidth(4);
202       gr1->SetFillStyle(0);
203    
204       TGraph * gr2 = new TGraph( size, x, y2 );
205       gr2->SetName("gr2");
206       gr2->SetTitle("graph 2");
207       gr2->SetMarkerStyle(22);
208       gr2->SetMarkerColor(2);
209       gr2->SetDrawOption("P");
210       gr2->SetLineColor(3);
211       gr2->SetLineWidth(4);
212       gr2->SetFillStyle(0);
213    
214       TGraph * gr3 = new TGraph( size, x, y3 );
215       gr3->SetName("gr3");
216       gr3->SetTitle("graph 3");
217       gr3->SetMarkerStyle(23);
218       gr3->SetLineColor(4);
219       gr3->SetLineWidth(4);
220       gr3->SetFillStyle(0);
221    
222       mg->Add( gr1 );
223       mg->Add( gr2 );
224    
225       gr3->Draw("ALP");
226       mg->Draw("LP");
227       c3->BuildLegend();
228    
229       return c3;
230    }
231    End_Macro
232    Begin_Html
233    
234    
235  End_Html */  End_Html */
236    
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