[vtk-developers] Charts in VTK and ParaView

Marcus D. Hanwell marcus.hanwell at kitware.com
Tue Mar 9 09:49:02 EST 2010

On Mon, Mar 8, 2010 at 4:06 PM, Eric E. Monson <emonson at cs.duke.edu> wrote:

> Hey Marcus,
> 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?
> Hi Eric,

I will look into this, I know that they are wrapped in Python, but I think
there is a little bit of Python code I need to add in order to make it
follow the same semantics as other modules. How are you trying to import the
module in Python?

They are also exposed in ParaView (both marked experimental in the views
right now).



> On Feb 16, 2010, at 1:33 PM, Marcus D. Hanwell wrote:
> > Hi,
> >
> > 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.
> >
> > http://www.vtk.org/Wiki/VTK/Charts/ChartAPI#Newer_Screenshot_in_ParaView
> >
> > 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,
> > etc).
> >
> > 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).
> >
> > Thanks,
> >
> > Marcus
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