[Therion] Therion 6.0.1 colour processing problem

[Martin Budaj]

Hi,

the problem is caused by an incompatible change in transparent colours
handling introduced in 6.0.0 (see
https://github.com/therion/therion/blob/master/CHANGES):

incompatible changes: the drawing option 'withtransparentcolor',
macro 'def_transparent_rgb' and predefined transparent colors tr_bg,
tr_white, tr_black were removed;
use the drawing option 'withcolor <color> withalpha <number>' instead

This allows you to use transparency without defining transparent colours in
advance, but you need to rewrite your metapost definitions.

The issue on page 57 mentioned by Bruce is not related to this change (I'll
add a clarification to the thbook).

Martin

On Sat, Aug 21, 2021 at 10:57 AM Bruce Mutton <bruce at tomo.co.nz> wrote:

> Anton
>
> It seems my current version of that file/layout doesn’t use transparent
> colours – I haven’t updated that wiki post for some years.
>
>
>
> I vaguely recall some discussion about transparent colours when differing
> colour models were introduced, but such things are above my knowledge level.
>
> A clue on top of page 57 of the Therion book.
>
>
>
> smooth-shading <off/quick> . set the mode of smooth scrap backgroud
> shading.
> By default, altidute and depth colour is interpolated across the scrap the quick
> way.
> Some issues are present if transparent symbol colours are used. More
> precise modes
> should be added in the future. If off, scrap is filled with single colour.
>
>
>
> On the other hand, your code is missing a ;
>
> What happens if you add one like this?
>
>     def_transparent_rgb (tr_color_sump_bg, .44, .81, .92)*;* %transparent
> version
>
>
>
> Or you could just delete the entire line, assuming you have not used
> tr_color_sump anywhere.
>
>
>
> Hope that helps.
>
> Bruce
>
>
>
>
>
> *From:* Therion <therion-bounces at speleo.sk> *On Behalf Of *A.M. van
> Rosmalen
> *Sent:* Saturday, 21 August 2021 19:53
> *To:* List for Therion users <therion at speleo.sk>
> *Subject:* [Therion] Therion 6.0.1 colour processing problem
>
>
>
> Hi there,
>
>
> Since I upgraded to the last version of Therion (6.01) on Windows my
> maps refuse to compile even though they used to compile just fine
> before and still compile under the previous version (on a Linux
> machine)
>
> Specifically this piece of code in LayoutStandards.thc drafted by
> Bruce Mutton found here:
> https://therion.speleo.sk/wiki/_media/templates:layoutstandards.txt
>
>   code metapost
>   %these colours affect fills, not the linework
>     !color colour_water_bg; %! forces interpretation as metapost
>     colour_water_bg := (0.82,.93,.95);      %light blue
>     !color colour_sump_bg;  %! forces interpretation as metapost
>     def_transparent_rgb (tr_color_sump_bg, .44, .81, .92) %transparent
> version
>     colour_sump_bg := (.44,.81,.92);    %dark blue
>
>     %these colours affect the linework
>     !color colour_rope;  %! forces interpretation as metapost
>     colour_rope :=  (0.35,0.75,1.0);    %blue
>     endcode
>
>
>
> Gives the following error message:
>
>
>
> >> def_transparent_rgb
> ! Isolated expression.
> <to be read again>
>                    (
> l.6979 def_transparent_rgb (
>                             tr_color_sump_bg, .44, .81, .92) %transparent
> ve...
> I couldn't find an `=' or `:=' after the
> expression that is shown above this error message,
> so I guess I'll just ignore it and carry on.
>
> ! Extra tokens will be flushed.
> <to be read again>
>                    (
> l.6979 def_transparent_rgb (
>                             tr_color_sump_bg, .44, .81, .92) %transparent
> ve...
> I've just read as much of that statement as I could fathom,
> so a semicolon should have been next. It's very puzzling...
> but I'll try to get myself back together, by ignoring
> everything up to the next `;'. Please insert a semicolon
> now in front of anything that you don't want me to delete.
> (See Chapter 27 of The METAFONTbook for an example.)
>
>
>
> I tried adding some := and =, but this just leads to the following
> error message:
>
>
> >> def_transparent_rgb
> >> (tr_color_sump_bg,0.44,0.81,0.92)
> ! Equation cannot be performed (numeric=cmykcolor).
> <to be read again>
>                    colour_sump_bg
> l.6980 colour_sump_bg
>                       := (.44,.81,.92);    %dark blue
> I'm sorry, but I don't know how to make such things equal.
> (See the two expressions just above the error message.)
>
> ! Extra tokens will be flushed.
> <to be read again>
>                    colour_sump_bg
> l.6980 colour_sump_bg
>                       := (.44,.81,.92);    %dark blue
> I've just read as much of that statement as I could fathom,
> so a semicolon should have been next. It's very puzzling...
> but I'll try to get myself back together, by ignoring
> everything up to the next `;'. Please insert a semicolon
> now in front of anything that you don't want me to delete.
> (See Chapter 27 of The METAFONTbook for an example.)
>
> Any ideas how to fix this?
>
> Cheers,
>
> Anton
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