[vtkusers] multiple xy plots?

[Emiliano Beronich]

Hi Davis,

You can use vtkXYPlotActor to show two or more sets of data. You can add 
a set of data with the code shown below. This is the basic code to add 
only one set. You can adapt it to add two o more sets.

   Data = vtkPolyData::New();
   vtkPoints *points = vtkPoints::New();
   vtkFloatArray *scalars = vtkFloatArray::New();
   int numberofpoints = 400;
   int MaxT = 1;
   int MinT = 0;
   for (int i = 0; i <= numberofpoints; i++ ) {
     float x[3] = {i, 0, 0};
     float y = i;
     points->InsertPoint(i, x);
     scalars->InsertTuple1(i, y);
   }

   Data->SetPoints(points);
   Data->GetPointData()->SetScalars(scalars);
   points->Delete();
   scalars->Delete();
   XYPlot->AddInput(Data);
   Data->Delete();

But I have found troubles when I want to remove a curve. I have found a 
bug on vtkXYPlotActor class on the method RemoveInput that may need to 
be fixed. I attach the modified class that fix this problem.

Regards,
Emiliano



David Bernstein wrote:

> 
> Hi All, Can someone post a simple C++ example showing how to get two or 
> more
> sets of data plotted in the same X-Y plot?  I'm importing the data in 
> the form of
> stl vectors.
> 
> Thanks,
> Dave Bernstein
> 
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