[NTG-context] Shading to transparent using withshademethod

Hans Hagen pragma at wxs.nl
Thu Jan 28 09:43:24 CET 2016


On 1/27/2016 10:05 PM, Marco Patzer wrote:
> Hi,
>
> some months ago the withshading, withfromshadecolor etc. have apparently been
> replaced by the more general withshademethod, withshadevector,
> withshadecolors, etc. methods.
>
> I have issues converting the old withshading code to the withshademethod
> version. The old code had no problems shading to transparent:
>
> \definecolor [trans] [a=multiply, t=.5, s=.5]
> \starttext
> \startMPcode
>    path p; p:=fullsquare xyscaled (8cm, 8cm);
>    fill p
>      withshading("linear", ulcorner p, llcorner p)
>      withfromshadecolor \MPcolor{black}
>      withtoshadecolor   \MPcolor{trans};
> \stopMPcode
> \stoptext
>
> The new code appears to work in general, but only if no shading to
> transparent is being used:
>
> \definecolor [trans] [a=multiply, t=.5, s=.5]
> \starttext
>    \startMPcode
>      % works
>      fill fullcircle scaled 10cm withcolor \MPcolor{trans};
>
>      fill fullsquare xyscaled (15cm, 15cm)
>        withshademethod "linear"
>        withshadevector (0,1)
>        % works
>        withshadecolors (red,\MPcolor{blue})
>        % fails
>        %% withshadecolors (red,\MPcolor{trans})
>        ;
>    \stopMPcode
> \stoptext
>
> How to make transparent shadings work with the new mechanism?

       withtransparency (1,.5)


> Marco
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