Iâm sorry, I was too fast. transparency is part of MetaFun extension only.
http://wiki.contextgarden.net/MetaFun <http://wiki.contextgarden.net/MetaFun> Samples of using of MetaFun: http://www.pragma-ade.com/show-gra.pdf <http://www.pragma-ade.com/show-gra.pdf> m.s. > 19. 7. 2016 v 14:00, Martin Sluka <martinsluka at mac.com>: > > There is transparency parameter in MetaPost: > > Transparent colors > > You can use transparent colors with the transparent(method, factor, color) > function. For example: > \runMPgraphicstrue > \setupcolors[state=start] > \starttext > \startreusableMPgraphic{a} > fill unitsquare scaled 1cm withcolor yellow; > fill unitsquare shifted (0.5,0.5) > % method 1 = normal > scaled 1cm withcolor transparent(1,0.5,red); > \stopreusableMPgraphic > > \placefigure[force,none]{}{\reuseMPgraphic{a}} > \stoptext > > The available transparency methods are the twelve methods supported by PDF > specification: > 1. normal > 2. multiply > 3. screen > 4. overlay > 5. softlight > 6. hardlight > 7. colordodge > 8. colorburn > 9. darken > 10. lighten > 11. difference > 12. exclusion > > On Jul 19, 2016, at 12:25 PM, Robert Staven <robert at staven.no> wrote: > >> Hi, >> >> I'm using Therion to map waterfilled caves, and some systems have >> 'air-locks' (air chambers), so it's necessary to distinguish between air >> filled cave, waterfilled cave and water surfaces. But the waterfilled >> area should show details (be transparent) in same way as dry cave. >> >> Is there any way to adjust the opacity value (in meta code?) when >> setting a transparent color? >> >> >> I have made a test to show my issues: >> The files can be found on http://www.staven.no/cavetest/ >> <http://www.staven.no/cavetest/> >> >> >> The cave (ca 100m long) >> plan: >> -> http://www.staven.no/cavetest/testcave_plan.pdf >> <http://www.staven.no/cavetest/testcave_plan.pdf> >> elevation: >> -> http://www.staven.no/cavetest/testcave_elevation.pdf >> <http://www.staven.no/cavetest/testcave_elevation.pdf> >> >> This doesn't work to well draw underwater maps. >> >> >> *** Changing the water color: >> >> layout test >> code metapost >> >> def a_water (expr p) = >> T:=identity; >> thfill p withcolor (0.8, 0.8, 1.0); >> enddef; >> >> endcode >> endlayout >> >> -> http://www.staven.no/cavetest/testcave_elevation_2.pdf >> <http://www.staven.no/cavetest/testcave_elevation_2.pdf> >> >> Looks better but the cave and line 'behind' doesn't show thru the water. >> >> >> *** Try with transparent water color: >> >> def_transparent_rgb(tr_lblue, 0.80, 0.80, 1.00); >> >> def a_water (expr p) = >> T:=identity; >> thfill p withtransparentcolor tr_lblue; >> enddef; >> >> -> http://www.staven.no/cavetest/testcave_elevation_3.pdf >> <http://www.staven.no/cavetest/testcave_elevation_3.pdf> >> >> >> *** Almost perfect, but I like to adjust the opacity value so it looks >> like this: >> >> def a_water (expr p) = >> T:=identity; >> enddef; >> # no drawing of water >> >> color map-fg [80 80 100] >> >> -> http://www.staven.no/cavetest/testcave_elevation_4.pdf >> <http://www.staven.no/cavetest/testcave_elevation_4.pdf> >> (NB You won't see the difference in Adobe Reader, but it shows up in >> SumatraPDF) >> >> >> Is there any way to adjust the opacity value when setting a transparent >> color? >> >> Or should I do this another way? >> _______________________________________________ >> Therion mailing list >> Therion at speleo.sk <mailto:Therion at speleo.sk> >> http://mailman.speleo.sk/listinfo/therion >> <http://mailman.speleo.sk/listinfo/therion> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.speleo.sk/pipermail/therion/attachments/20160720/cf9eeeec/attachment.html>
