[Paraview-developers] Color Scale Editor Design

[Utkarsh Ayachit]

Burlen,

> 1) combine the opacity widget and the color scale widget.

Good idea! Let me see how much effort that's going to be. Hopefully,
it's not too bad to add support for this.

> 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.

We have thought of this in the past. As useful that this is, it's a
bit tedious to implement. I'll put that as a feature request to be
addressed in future for now.

> 2) add a "mirror scale" option.

Should be too hard to add.


> 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.

Burlen, for such cases you may want to look into using the newly added
"categorical color" support rather than adding 256 control points.


> 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.

I'm not sure I follow the need for this. With support for categorical
colors, some of the use-cases with large number of control points may
become unnecessary.

Utkarsh