[Therion] Therion 6.0.1 colour processing problem

[Bruce Mutton]

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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