On Thu, 12 Jul 2018 11:21:45 +0200
Hans Hagen
For the old implementation (pre 2016-ish) I had a working solution because shading to transparent colours just worked (at least in my case of a simple transparent shade, nothing fancy), but not so any longer. With the new implementation I couldn't get it working. But we discussed that at some point in the past. I believe the gist of it was “shade-to-transparent is gone”.
i'm not ssure what shade to transparency means
I mean a shade from a colour (e.g. black) to transparent. For instance this used to work pre 2016: \setupbackgrounds [page] [background=color, backgroundcolor=lightgray] \definecolor [trans] [a=multiply, t=1, s=1] \starttext \startMPcode path p; p:=fullsquare xyscaled (5cm, 5cm); fill p withshading("linear", ulcorner p, llcorner p) withfromshadecolor \MPcolor{white} withtoshadecolor \MPcolor{trans}; \stopMPcode \stoptext The shade goes from white to transparent (here lightgray, that's the page colour). I assume you have an older context laying around to run the example above.
... shades can be transparent currently
Yes, but the *whole* shade is made transparent. Currently I don't know a way to shade from e.g. black to transparent (no colour). The colour involved in the shading can't have transparency, or if they do one has to use \MPcoloronly to get rid of the transparency part. So the above old syntax roughly translated to the current implementation: \setupbackgrounds [page] [background=color, backgroundcolor=lightgray] \definecolor [trans] [a=multiply, t=1, s=1] \starttext \startMPcode path p; p:=fullsquare xyscaled (5cm, 5cm); fill p withshademethod "linear" withshadevector (3, 0) %% since "trans" contains transparency, one has to use \MPcoloronly withshadecolors (white, \MPcoloronly{trans}) withtransparency (.5, .5) %% withtransparency \MPtransparency{trans} ; \stopMPcode \stoptext
.. so how did that old file (uncompressed pdf) look like then
Just run the first example with an old context version. The file gradient-t from my last mail was created using inkscape as I don't want a single project to depend on two different context versions. Marco