Create Parallel Coordinates Chart

Support
1

Hello!

I would like to know how i can create Parallel Coordinates chat?

i have some paths that have various metrics and for each metrics i save the min.max in a column of a table, which i connect to a vtkMRMLTableNode.

What do i need to do afterwards to create a Parallel Coordinates Chart?

2

The plot type currently supported in the Plots module are:

  • line
  • bar
  • scatter
  • scatter-bar

It could be extended to also include parallel-coordinates by leveraging the vtkPlotParallelCoordinates VTK class.

If you would like to help improve the code base, we can provide additional guidance.

As a starting point, you could look at qMRMLPlotViewPrivate::updatePlotFromPlotSeriesNode

References:

3

Thanks for the answer @jcfr. I will work on it an submit a PR on Slicer’s Github.

4

@jcfr @lassoan

Could i change the API of the following in the ctk library?

class CTK_VISUALIZATION_VTK_WIDGETS_EXPORT ctkVTKChartView : public ctkVTKOpenGLNativeWidget
{
  Q_INVOKABLE vtkChartXY* chart()const;

chart() to return a vtkChart object instead of vtkChartXY?
I wanna do that because i need vtkChartParallelCoordinates instead of vtkChartXY.
Also this will enable us to be able to add other subclasses of vtkChart such as, vtkChartBox, vtkChartPie. vtkHistogram2D.

5

Adding support for more chart types would be great!

Adding an API to get/set vtkChart* is certainly necessary for this, but simply changing the return type would be a breaking change (could cause compilation errors) that would be nice to avoid. For example we could simply add a new method (abstractChart(), generalChart(), …).

We would need to see all the necessary API changes for making a final decision on whether we should make any breaking changes.