On 11 Apr 2016, at 16:17, Alan BRASLAU mailto:alan.braslau@cea.fr> wrote: Remember that ConTeXt colors can be accessed in MP as \MPcolor{orange} Alan However with the snippet below I see the default black with MPcolor and the wanted red with \MPvar. Thus? Hans van der Meer \starttext \startuseMPgraphic{example1}{color} pickup pencircle scaled 1mm; draw unitsquare scaled 1cm withcolor \MPcolor{color}; \stopuseMPgraphic \startuseMPgraphic{example2}{color} pickup pencircle scaled 1mm; draw unitsquare scaled 1cm withcolor \MPvar{color}; \stopuseMPgraphic \useMPgraphic{example1}{color=red} \useMPgraphic{example2}{color=red} \stoptext

But why should typing \MPcolor{\MPvar{color}}be necessary or useful when \MPvar(color) obviously is sufficient? Or is there a special reason for the nested macros?

On 11 Apr 2016, at 19:16, Aditya Mahajan wrote:

On Mon, 11 Apr 2016, Meer, Hans van der wrote:

...

On 11 Apr 2016, at 16:17, Alan BRASLAU mailto:alan.braslau@cea.fr> wrote:

Remember that ConTeXt colors can be accessed in MP as \MPcolor{orange}

Alan

However with the snippet below I see the default black with MPcolor and the wanted red with \MPvar. Thus?

Hans van der Meer

\starttext \startuseMPgraphic{example1}{color} pickup pencircle scaled 1mm; draw unitsquare scaled 1cm withcolor \MPcolor{color};

This is looking for a color named 'color'. You need \MPcolor{\MPvar{color}}.

...

\stopuseMPgraphic \startuseMPgraphic{example2}{color} pickup pencircle scaled 1mm; draw unitsquare scaled 1cm withcolor \MPvar{color}; \stopuseMPgraphic \useMPgraphic{example1}{color=red} \useMPgraphic{example2}{color=red} \stoptext

Aditya

Hans van der Meer

Thank you Wolfgang, this is a very good explanation. One can simplify one's code, perhaps, by defining MP colors from ConTeXt colors, as in: color orange ; orange := \MPcolor{orange} ; Then, one can use orange. There is not much point in redefining the other colors (red, green, blue, cyan, magenta, yellow, black, white) as they are defined using the same rgb values. In fact, \MPcolor{} simply injects "(r,g,b)" or "(c,m,y,k)" with explicit values into the MP code. Defining new MP colors is less general than explicitly using \MPcolor{...}, for it is limiting, and it would be somewhat silly to add definitions for all of the wonderful colors found in colo-imp-x11, for example. By the way, we added colo-imp-crayola having some funky, hallucinogenic names (according to Hans) as well as colo-imp-ral. (The first might be of interest to Americans and the second to Europeans ;-) Other collections, such as colo-imp-pantone and colo-imp-rosco are not distributed due to copyright restrictions (but I have made private copies, shhh!) Alan On Mon, 11 Apr 2016 22:27:06 +0200 Wolfgang Schuster wrote:

There are two way to define colors for a metapost graphics, the first is to define it with metapost itself.

%% begin example \startMPpage color myred ; myred := (1,0,0) ; fill fullcircle scaled 3cm withcolor myred ; \stopMPpage %% end example

The disadvantage is that you can use this color only in your graphics but not in your tex code.

Now comes the second method where I define the color in tex with the \definecolor command and access it in metapost with the color \MPcolor command.

%% begin example \definecolor[myred][r=1]

\startMPpage fill fullcircle scaled 3cm withcolor \MPcolor{myred} ; \stopMPpage %% end example

The second part of the questions concerns metapost variables.

%% begin example \startuseMPgraphic{mycircle}{diameter,color} fill fullcircle scaled \MPvariable{diameter} withcolor \MPvariable{color} ; \stopuseMPgraphic

\startTEXpage \useMPgraphic{mycircle}{diameter=3cm,color=red} \stopTEXpage %% end example

The second argument of the \startuseMPgraphic command initializes the variables of your command and the \MPvariable accesses the value of the variable. In this case "color" is only the name of the variable and doesn’t tell if we want a tex defined color or a metapost defined color.

In my example the color has to be defined in metapost because after expansion we end with "withcolor red" in the example. We you want a color which has been defined in tex you have put \MPcolor around the \MPvariable command, i.e. "\MPcolor{\MPvariable{color}}".

On 4/12/2016 12:52 AM, L.S.-Soc&Gam wrote:

Hi guys,

I updated CTX today and now on every pdf compilation i get two warnings:

interfaces > implementor > warning: 'scanners.setmapfile' is redefined interfaces > implementor > warning: 'commands.setmapfile' is redefined

so three CTX runs give me six warnings. is there a way to disable them?

you have to wait till the update (tomorrow) Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------