[vtk-developers] Charts in VTK and ParaView
Eric E. Monson
emonson at cs.duke.edu
Mon Mar 8 16:06:19 EST 2010
Thanks for filling us in on the new Charts progress.
I was going to try playing around with it today, but I tend to do my prototyping in Python and I found that with (today's) CVS VTK I couldn't access any of the new charts API classes.
Are they not wrapped in Python, or is it likely I'm just doing something wrong?
Eric E Monson
Duke Visualization Technology Group
On Feb 16, 2010, at 1:33 PM, Marcus D. Hanwell wrote:
> I wanted to give a summary of the progress made with charts in VTK and
> ParaView. Over the last couple of weeks I have been working on integrating the
> new VTK/OpenGL based charts into ParaView. I have the necessary proxies and
> filters in place so that you can now select the columns of the table to be
> plotted. This work is all in VTK/ParaView CVS head.
> I have been working on achieving feature parity with the existing line charts.
> So the vtkChartXY class now contains functions to add and manage the plots.
> The axes can automatically calculate "pretty numbers" to be used for tick
> locations/marks. I have also added line stippling in addition to the coloring,
> and the mouse interaction features (using vtkContextScene) allow zooming and
> panning as you would expect.
> You can also select the X column to be used, or use the index of the array.
> This is all exposed in the ParaView interface under the XY Chart
> (EXPERIMENTAL) view type. I am currently adding some facilities to choose
> colors automatically and place a legend on the chart. This is all exposed in
> the VTK API, and it is possible to do more in that API than can is currently
> exposed in the ParaView GUI.
> The classes in VTK/Charts, specifically vtkChart* and vtkPlot* expose much of
> this functionality. Mouse interaction is now handled by the vtkContextScene
> class, with panning and zomming support already present.
> Selection support will require some additional hooks, but is something I hope
> to add in soon. Work on a new Mark API should help us to generalize how
> multiple arrays can be mapped onto plots in charts (such as color, mark size,
> I would appreciate feedback on this work as it currently stands. I will be
> working away to flash out the holes I see for ParaView and a general line chart
> display. I will also be fixing bugs, adding tests, and hopefully exposing a few
> of the new features in the ParaView GUI (such as scientific style axes - at the
> origin as you pan around).
> Marcus D. Hanwell, Ph.D.
> R&D Engineer, Kitware Inc.
> (518) 881-4937
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