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Diffstat (limited to 'systems/doc/metapost/source-manual/grdemo.ms')
-rw-r--r-- | systems/doc/metapost/source-manual/grdemo.ms | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/systems/doc/metapost/source-manual/grdemo.ms b/systems/doc/metapost/source-manual/grdemo.ms new file mode 100644 index 0000000000..fbcbfaceff --- /dev/null +++ b/systems/doc/metapost/source-manual/grdemo.ms @@ -0,0 +1,124 @@ +.nr PS 11 +.nr VS 13 +.TL +MetaPost with groff +.LP +Since MetaPost is a picture-drawing language that outputs PostScript, +it is necessary to use the +.ft CW +-mpspic +.ft +macro package, which is automatically included when \fIgroff\fR +is invoked with the +.ft CW +-Tps +.ft +option to prepare output for PostScript printers or previewers. +.PP +Suppose you have written some figures in MetaPost and placed +the input in a file \f(CWfigures.mp\fR. +Running +.nf +.ft CW + mp -T figures +.ft +.fi +to invoke the MetaPost interpreter produces output files +\f(CWfigures.1\fR, \f(CWfigures.2\fR, .\|.\|. +which can be included in a \fIgroff\fR document via macro calls +such as +.nf +.ft CW + .PSPIC figures.1 width height +.ft +.fi +as explained in the \fIgrops\fR(1) documentation. +Note that the picture gets rescaled if the height and width +in the \f(CW.PSPIC\fR command don't match \fImp\fR's idea of +the picture dimensions. +.PP +For instance, +.PSPIC figs.1 1.5i 1.08i +this figure was derived from a file +.ft CW +figs.mp +.ft +and included at this point by invoking the \f(CW.PSPIC\fR macro +with height 1.08 inches and width 1.5 inches. +.PP +The file +.ft CW +figs.mp +.ft +looks like this: +.nf +.ft CW +.nr PS 9 +.nr VS 11 +prologues:=1; +input boxes +beginfig(1); +pair shadowshift; shadowshift=(1,-1)*bp; + +def drawshadowed(text t) = + forsuffixes $=t: + fill bpath$ shifted shadowshift; + unfill bpath$; + drawboxed($); + endfor +enddef; + +boxit.a(btex \\s8A\\s+2 \\(lh a etex); +circleit.b(btex $e sup {i omega t}$ etex rotated 20); +b.w - a.e = (10bp,0); +drawshadowed(a,b); +draw a.e..b.w; + +draw bbox currentpicture dashed evenly; +endfig; +.nr PS 11 +.nr VS 13 +.ft +.fi +.PP +Note that the typesetting commands in the +\f(CWbtex\fR.\|.\|.\f(CWetex\fR blocks in the above example +are processed by +.nf +.ft CW + eqn -d\\$\\$ | troff -Tpost +.ft +.fi +If a different \fItroff\fR pipeline is desired, it can be specified +via the +.ft CW +TROFF +.ft +environment variable. For example, +.nf +.ft CW + TROFF='tbl | eqn -d\\$\\$ | troff -Tpost' +.ft +.fi +adds \fItbl\fR to the pipeline in addition to \fIeqn\fR. +.PP +Macro definitions and such can be added via the standard +\f(CWverbatimtex\fR.\|.\|.\f(CWetex\fR mechanism that adds the +given material to the \fItroff\fR input. Such material should +not generate any output since this would get mixed up with the +next \f(CWbtex\fR.\|.\|.\f(CWetex\fR block. Thus, newlines between +\f(CWverbatimtex\fR and \f(CWetex\fR must be protected with \f(CW\\\fR. +.PP +Unfortunately, typesetting of \f(CWbtex\fR.\|.\|.\f(CWetex\fR blocks +currently doesn't work with \fIgroff\fR and equires a UNIX +\fItroff\fR implementation, because MetaPost's \f(CWdmp\fR +post-processor can't handle \fIgroff\fR's extended font and output +file formats documented in \fIgroff_font\fR(5) and \fIgroff_out\fR(5). +Nevertheless, using \fItroff\fR to prepare figures with MetaPost +and \fIgroff\fR to typeset them may still be a useful combination +if your \fItroff\fR implementation doesn't provide the +.ft CW +-mpictures +.ft +macro packages. + |