[Paraview-developers] Changes coming to ParaView's color legend

[Cory Quammen]

Hi folks,

There are a number of issues with ParaView's current color legend.
Here are a few:

http://www.paraview.org/Bug/view.php?id=15875
http://www.paraview.org/Bug/view.php?id=16000
http://www.paraview.org/Bug/view.php?id=15379
http://www.paraview.org/Bug/view.php?id=15074
http://www.paraview.org/Bug/view.php?id=15864
http://www.paraview.org/Bug/view.php?id=15862
http://www.paraview.org/Bug/view.php?id=15851
http://www.paraview.org/Bug/view.php?id=15637
http://www.paraview.org/Bug/view.php?id=15319
http://www.paraview.org/Bug/view.php?id=14980
http://www.paraview.org/Bug/view.php?id=15049
http://www.paraview.org/Bug/view.php?id=14146

You get the idea...

To address most of these issues and to make future fixes hopefully
more straightforward, I have been working on a new implementation of
ParaView's color legend. Key improvements in the implementation
include:

- numerous bug fixes
- ability to specify precisely the values to label
- improved automatic "human-readable" values for the tick labels
- font size controls that offer precise control over font properties.
Size can be arbtitrary, for exampld
- precise control over the color bar thickness
- uses VTK's charts API, so making future improvements to the scalar
bar is easier than in the current implementation

While the color legend will look similar to the current color legend,
you will likely see some differences once this change lands in master.
Any baseline image used by testing infrastructure for ParaView or
ParaView-based applications with a color legend will probably need to
be updated.

Note that these changes are in ParaView only and do not affect the
scalar bars in VTK.

I plan to put together a blog post on the Kitware web site showing off
the new color legend in the near future. In the mean time, please let
me know if you have any questions or concerns.

Thanks,
Cory


-- 
Cory Quammen
R&D Engineer
Kitware, Inc.