[Paraview-developers] Color Scale Editor Design

[burlen]

Hi Utkarsh,

two ways you can save space and improve the utility of the color scale 
editor for pseudo color and volume rendering.

1) combine the opacity widget and the color scale widget. still use two 
curves, but stack the opacity curve ontop of the color scale. I think it 
would also be very useful to display a histogram of the active scalar 
plotted using the LUT colors in the new widget. That would replace the 
rectangular plot of the color scale that's currently in use.

2) add a "mirror scale" option. This would flip the colors in the active 
LUT. It's quite useful at times to flip the color scale on certain LUT's 
depending how the scalar values in a given dataset are distributed and 
according to which features in the data you're trying to visualize. 
Currently to do this we have to create a new LUT which adds to the 
already long list of LUTs. Adding this feature will let us acheive the 
desired result while reducing the number of LUT's in the list.

Also, with the current color scale widget it's pretty difficult to 
interactively manipulate LUT's with many color points (eg when 256 
colors are explicitly specified). The control points are too close 
together to select and they way it's implemented now you'd need to move 
surrounding control points as well.

3) limit the number of control points used by the widget. The default 
max number of control points used by the widget would be something 
reasonable like 16 but the user could increase if desired via a qt spin 
control. The active control points in the widget would be evenly spaced 
across the scale and during interaction as the user moves the visible 
control points the widget would handle linearly re-interpolating the 
position of the hidden control points automatically.

here's what those features would like:


I'd also vote for fixing the bugs:

http://paraview.org/Bug/view.php?id=14094
http://paraview.org/Bug/view.php?id=14093
http://paraview.org/Bug/view.php?id=14092
http://paraview.org/Bug/view.php?id=14091

admittedly this is a lot of work! but since you asked I thought now 
would be the time to bring it up.

Burlen

On 07/09/2013 02:51 PM, Utkarsh Ayachit wrote:
> Alan (et. al),
>
> As I was working on the fixing log-scaling with color-scale editor, I
> figured it might be worthwhile to revisit the UI for the color scale
> editor.
>
> Attached is a *partial* mockup. The basic idea is to make the dialog
> adopt the style used by the "Properties" panel i.e. become a (possibly
> dockable) property sheet with default and advanced properties, that
> can be searched, just like the "Properties" panel.
>
> To keep the panel from becoming really long, we could move the
> properties for the "Scalar Bar" into a a separate panel. That panel
> can be made accessible (besides the usual toolbar/menu) by simply
> double-clicking on the scalar bar in the 3D view.
>
> Thoughts?
>
> Utkarsh
>
>
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