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\startenvironment metafun-environment-sample
\startuseMPgraphic{sample setup}
numeric Scale ; Scale := 2cm ;
numeric Size ; Size := 2.5mm/Scale ;
numeric Pen ; Pen := .25mm/Scale ;
path Path ;
pickup pencircle scaled (4Pen) ;
def InRed = withcolor .625red enddef ;
def InYellow = withcolor .625yellow enddef ;
def InGray = withpen pencircle scaled Pen withcolor .625white enddef ;
def InBetween= withpen pencircle scaled (4Pen) withcolor .800white enddef ;
def InBlack = withpen pencircle scaled Pen enddef ;
def InWhite = withpen pencircle scaled Pen withcolor white enddef ;
def DrawArrow text t =
draw t ; Path := boundingbox currentpicture ;
drawarrow t ; setbounds currentpicture to Path ;
enddef ;
def ColorCircle =
fill llcircle withcolor .625red ;
fill lrcircle withcolor .625green ;
fill urcircle withcolor .625blue ;
fill ulcircle withcolor .625yellow ;
enddef ;
evenly := dashpattern(on (3mm/Scale) off (3mm/Scale)) ;
withdots := dashpattern(off (2.5mm/Scale) on 0 off (2.5mm/Scale)) ;
ahlength := 4mm/Scale ; ahangle := 30 ;
draw (origin shifted (0,Size)--origin shifted (0,-Size)) ;
draw (origin shifted (Size,0)--origin shifted (-Size,0)) ;
picture Origin ; Origin := currentpicture ;
setbounds Origin to origin--cycle ;
currentpicture := nullpicture ;
\stopuseMPgraphic
\startuseMPgraphic{sample finish}
draw boundingbox currentpicture InBlack ;
draw Origin InGray ;
currentpicture := currentpicture scaled Scale ;
\stopuseMPgraphic
% fm = metafun macro
% fv = metafun variable
% mc = metapost concept
% mm = metapost macro
% mp = metapost primitive
% mv = metapost variable
\starttexdefinition unexpanded DoDoSampleHead#1#2#3
\setbox\scratchbox\vbox {
\tabskip\zeropoint
\tt\tfx
\halign {
\strut\hss##\unskip\unskip
\cr#3\cr#1\cr
}
}
\ht\scratchbox\ht\strutbox
\dp\scratchbox\dp\strutbox
\noligature{#2}\black
\hfill
\box\scratchbox
\ignorespaces
\stoptexdefinition
\starttexdefinition unexpanded DoSampleHead #1#2#3
\processaction
[#1]
[fm=>\DoDoSampleHead{metafun macro}{#2}{#3},
fv=>\DoDoSampleHead{metafun variable}{#2}{#3},
mc=>\DoDoSampleHead{metapost concept}{#2}{#3},
mm=>\DoDoSampleHead{metapost macro}{#2}{#3},
mp=>\DoDoSampleHead{metapost primitive}{#2}{#3},
mv=>\DoDoSampleHead{metapost variable}{#2}{#3}]
\stoptexdefinition
\starttexdefinition unexpanded SampleHead #1#2#3
\expanded{\extrosubject{\DoSampleHead{#1}{#2}{\detokenize{#3}}}}
\stoptexdefinition
\starttexdefinition unexpanded StartSample
\doquintuplegroupempty\doStartSample
\stoptexdefinition
\starttexdefinition unexpanded StopSample
% dummy
\stoptexdefinition
\starttexdefinition unexpanded doStartSample #1#2#3#4#5#6 StopSample
\bgroup
\SampleHead{#1}{#2}{#3}
\startuseMPgraphic{dummy}
\includeMPgraphic{sample setup}
#6
\includeMPgraphic{sample finish}
\stopuseMPgraphic
\blank[samepage]
\startlinecorrection[blank]
\useMPgraphic{dummy}
\stoplinecorrection
\egroup
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleZ #1#2#3
\bgroup
\SampleHead{#1}{#2}{}
\blank[samepage]
#3
\par
\egroup
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleA #1#2#3
\StartSample{#1}{#2}{#3}
path p ; p := #3 ; % freeze randomized
if length(p)>0 :
DrawArrow p InRed ;
fi ;
drawpoints p InBetween ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleB #1#2#3#4
\StartSample{#1}{#2}{#4}
DrawArrow (#3) InRed ;
DrawArrow (#4) InYellow ;
drawpoints (#3) InBetween ;
drawpoints (#4) InBetween ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleC #1#2#3#4
\StartSample{#1}{#2}{#4}
path bb ; bb := boundingbox #3 ;
DrawArrow #3 InRed ;
draw #4 withpen pencircle scaled .15 InYellow ;
setbounds currentpicture to bb ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleD #1#2#3#4
\StartSample{#1}{#2}{#4}
DrawArrow #3 InRed ;
setbounds currentpicture to #4 ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleDD #1#2#3#4
\StartSample{#1}{#2}{#4}
DrawArrow #3 InRed ;
DrawArrow #4 InYellow ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleE #1#2#3#4
\StartSample{#1}{#2}{#4}
fill fullcircle scaled 1cm InRed ;
currentpicture := currentpicture #3 ;
Scale := 1 ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleF #1#2#3#4
\StartSample{#1}{#2}{#4}
DrawArrow #3 InRed ;
drawdot #4 InYellow ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleG #1#2#3#4
\StartSample{#1}{#2}{#4}
draw #3 InRed ;
drawdot #4 InYellow ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleH #1#2#3#4#5
\StartSample{#1}{#2}{#5}
DrawArrow #3 InRed ;
DrawArrow #4 InYellow ;
drawdot #5 InWhite ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleHH #1#2#3
\StartSample{#1}{#2}{#3}
draw #3 InRed ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleI #1#2#3
\StartSample{#1}{#2}{#3}
draw fullcircle InRed #3 ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleII #1#2#3
\StartSample{#1}{#2}{#3}
draw fullcircle #3 InRed ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleJ #1#2#3
\StartSample{#1}{withpen #2}{withpen #3 scaled 2mm}
draw fullcircle xscaled 2 withpen #3 scaled Pen InRed ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleK #1#2#3
\StartSample{#1}{withpen #2}{withpen #3}
draw fullcircle xscaled 2 withpen #3 InRed ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleL #1#2#3
\StartSample{#1}{#2}{#2 #3}
#2 #3 InRed;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleM #1#2#3
\StartSample{#1}{#2}{#2 #3}
fill boundingbox (#3--cycle) InRed ;
#2 #3 ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleN #1#2#3#4
\StartSample{#1}{#2}{#3}
#3 ;
draw #4 withpen pencircle scaled 25Pen InRed ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleO #1#2#3
\StartSample{#1}{#2}{#3}
drawdot origin InRed ;
#3 scaled (2.5/Scale) InYellow ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleP #1#2#3
\StartSample{#1}{#2}{#3}
drawdot origin InRed ;
#3 scaled (2.5/Scale) InYellow ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleQ #1#2#3
\StartSample{#1}{#2}{#3}
#2 #3 withpen pencircle scaled 25Pen InRed ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleQQ #1#2#3
\StartSample{#1}{#2}{#3}
#3 scaled (2.5/Scale) withpen pencircle scaled Pen InYellow ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleQQQ #1#2#3
\StartSample{#1}{#2}{#3}
#3 scaled (2.5/Scale) withpen pencircle scaled Pen ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleR #1#2#3
\StartSample{#1}{#2}{#3}
ColorCircle ;
addto currentpicture also (#3) shifted (bbwidth(currentpicture)+.1,0) ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleS #1#2#3
\StartSample{#1}{#2}{#3}
Pen := Pen * Scale ; Scale := 1 ; #3 ;%
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleT #1#2#3#4
\StartSample{#1}{#2}{#3}
#4 ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleU #1#2#3
\StartSample{#1}{#2}{#3}
Scale := Scale / 5 ;
#3 ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleUU #1#2#3
\StartSample{#1}{#2}{#3}
Scale := Scale / 10 ;
#3 ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleV #1#2#3#4
\StartSample{#1}{#2}{#3}
Scale := Scale / 5 ;
Pen := Pen * 20 ;
#4 ;
Pen := Pen / 20 ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleW #1#2#3#4
\StartSample{#1}{#2}{#3}
Scale := 1 ;
#4 ;
\StopSample
\stoptexdefinition
\starttexdefinition unexpanded ShowSampleX #1#2#3
\StartSample{#1}{#2}{#3}
#3 InRed ;
\StopSample
\stoptexdefinition
\stopenvironment
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