[Therion] Therion 6.0.0 altitude colour legend feedback

[Bruce Mutton]

>Is it possible to scale the length of the bar based on the number of altitudes so that it fits the standard variable module length used for other colour legends?

>>this has been implemented in 9a30b34 <https://github.com/therion/therion/commit/9a30b34a9c9ed54e8c651c2edbb8ef7573e83b6f> . 

This is working I think – yet to test with all projects.

> I tried using the ‘smooth-shading off’ option in the hope that the altitude legend format would revert to the old style, but there is no difference; it comes out the same as if ‘smooth-shading quick’ is set.

>>This is intended, because even if you don't use smooth shading for scraps, most of the scraps colored by altitude get colors which are not found on the old-style discrete color legend. So a smooth color legend should be useful. Do you see a use case for having a discrete legend in this case?

 

I’m not sure.  I am undecided as to whether I would prefer independent control of the colour-legend style (user specifies smoothed if Therion can do it, or specifies discrete regardless of whether Therion can do smoothed or not).  The current implementation seems to decide automatically, depending on the type of lookup (for example banded gives discrete, otherwise it is smoothed).  Probably I would prefer independent control.  Especially as the discrete style is used for all only most altitude map-fg / lookups and for all other map-fg / lookups.

 

Here is a little game I set up in 2018, in order to work around the ‘colours not found’ issue you described above (ie I would artificially adjust the max and min altitude lookup altitudes to bias the colour a little bit).

So I have re-run it with 5.5.7+5656503 and 6.0.0+9a30b34.  I think it is useful for putting the altitude colourbar through it’s paces. Refer to the 10 images in the attached zip file.

 

My tentative comments:

1.	The new colourbar misses out the top colour (red), and generally biases the colours on the colourbar too far up relative to the labelled altitudes (a bug).
2.	Non-linear colour specifications are represented much better by the colour bar than with the discrete colour legend, because labels are proportionate to the non-linearity.
3.	The new colourbar chooses  better (round number) altitude labels.
4.	The old version (5.5.7) works better with banded colours as 6.0.0 did not shade it as I would like.  It will probably be OK with smooth shading off – didn’t get around to checking that yet.

 

Bruce

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