[vtkusers] How to setup Parallel Coordinates?

[Eric E. Monson]

Hey Henry,

After playing with it for a few minutes I'm starting to suspect that although vtkParallelCoordinatesRepresentation is supposed to accept a vtkTable as input, maybe there are some problems with that. The example from the Wiki uses a vtkImageData as input and plots its attributes.

What you might want to do is to switch to using the parallel coordinates chart from the newer VTK Charts. It doesn't have quite as many selection mode options, but it is very nice. Also, I know it's built to take a table as input for sure:

# ======
import vtk

# Set up a 2D scene, add an XY chart to it
view = vtk.vtkContextView()
view.GetRenderer().SetBackground(1.0, 1.0, 1.0)
view.GetRenderWindow().SetSize(600,300)

chart = vtk.vtkChartParallelCoordinates()
view.GetScene().AddItem(chart)

reader = vtk.vtkDelimitedTextReader()
reader.DetectNumericColumnsOn()
reader.SetFieldDelimiterCharacters(" ")
reader.SetHaveHeaders(True)
reader.SetMaxRecords(100)
reader.SetFileName("News.gbdiv")
reader.Update()

chart.GetPlot(0).SetInput(reader.GetOutput())

view.ResetCamera()
view.Render()

# Start interaction event loop
view.GetInteractor().Start()
# ======

I have other examples which include setting column/axis visibility and getting the indices of selections that I can put up on the Wiki sometime.

Talk to you later,
-Eric

------------------------------------------------------
Eric E Monson
Duke Visualization Technology Group


On Oct 15, 2010, at 11:49 PM, Henry wrote:

> Hi! :-)
> I'm having a problem and it's:
> 
> I'd like to plot parallel coordinates but I can't. The vtkParallelCoordinatesRepresentation can't get my data. It doesn't plot the rows.
> 
> I'm trying to be guided by the example of the wiki: http://www.vtk.org/Wiki/VTK/Examples/Python/Infovis/ParallelCoordinatesView
> (The example works very well; my code doesn't)
> 
> My code is:
> (...)
> 
> reader = vtkDelimitedTextReader()
> reader.DetectNumericColumnsOn()
> reader.SetFieldDelimiterCharacters(" ")
> reader.SetHaveHeaders(True)
> reader.SetMaxRecords(100)
> reader.SetFileName(".\DataSets\News.gbdiv")
> reader.Update()
> #table = reader.GetOutput()
> 
> rep = vtk.vtkParallelCoordinatesRepresentation()
> 
> # I don't know why this don't work
> 
> rep.SetInputConnection(reader.GetOutputPort())  
> 
> #I have tried many ways to put my data in, but nothing works. another is:
> #rep.SetInput(table)
> 
> rep.SetInputArrayToProcess(0,0,0,0,'all')
> rep.SetInputArrayToProcess(1,0,0,0,'music')
> rep.SetInputArrayToProcess(2,0,0,0,'entertainment')
> rep.SetInputArrayToProcess(3,0,0,0,'health')
> rep.SetInputArrayToProcess(4,0,0,0,'business')
> rep.SetInputArrayToProcess(5,0,0,0,'sport')
> rep.SetInputArrayToProcess(6,0,0,0,'science')
> rep.SetInputArrayToProcess(7,0,0,0,'environment')
> rep.SetInputArrayToProcess(8,0,0,0,'politics')
> 
> #Here is the same code in the example of the wiki
> rep.SetUseCurves(0)    
> rep.SetLineOpacity(0.5)
> view.SetRepresentation(rep)
> view.SetInspectMode(1)     
> view.SetBrushModeToLasso()
> view.SetBrushOperatorToReplace()
> def ToggleInspectors(obj,event):
>     if (view.GetInspectMode() == 0):
>         view.SetInspectMode(1)
>     else:
>         view.SetInspectMode(0)
> view.GetInteractor().AddObserver("UserEvent", ToggleInspectors)
> view.GetRenderWindow().SetSize(1000,600)
> view.ResetCamera()
> view.Render()
> view.GetInteractor().Start()
> 
> 
> The data read by the reader is(each column,All, Music, Enter..., is a coordinate):
> All Music Entertainment Health Business Sport Science Environment Politics
> 2.02657807 0.86289549 0.31007752 1.10266160 0.92307692 0.27089783 0.98556846 0.45808520 0.11614402
> 1.67774086 0.23969319 2.17054264 0.83650190 0.19230769 0.00000000 0.70397747 0.04580852 0.27100271
> 1.16279070 0.14381592 0.10335917 0.41825095 0.73076923 0.34829721 0.35198874 0.22904260 0.61943477
> (...)
> 
> 
> What should I do to plot my data? What am I forgetting to? The reader get my data and the GetOutput() return a table. I've tried get some values by index and i'v got the right ones. But I can't plot it. =\
> 
> Thank you, 
> :)
> 
> -- 
> Henry
> 
> Bacharelado em Ciências de Computação - 2007
> ICMC - USP - São Carlos
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