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%D \module
%D [ file=mp-grap.mpiv,
%D version=2012.10.16, % 2008.09.08 and earlier,
%D title=\CONTEXT\ \METAPOST\ graphics,
%D subtitle=graph packagesupport,
%D author=Hans Hagen \& Alan Braslau,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See licen-en.pdf for
%C details.
if known context_grap : endinput ; fi ;
boolean context_grap ; context_grap := true ;
input graph.mp ;
vardef roundd(expr x, d) =
if abs d > 4 :
if d > 0 :
x
else :
0
fi
elseif d > 0 :
save i ; i = floor x ;
i + round(Ten_to[d]*(x-i))/Ten_to[d]
else :
round(x/Ten_to[-d])*Ten_to[-d]
fi
enddef ;
Ten_to0 = 1 ;
Ten_to1 = 10 ;
Ten_to2 = 100 ;
Ten_to3 = 1000 ;
Ten_to4 = 10000 ;
def sFe_base = enddef ;
if unknown Fe_plus :
picture Fe_plus ; Fe_plus := textext("+") ; % btex + etex ;
fi ;
vardef format (expr f,x) = dofmt_.Feform_(f,x) enddef ;
vardef Mformat (expr f,x) = dofmt_.Meform (f,x) enddef ;
vardef formatstr (expr f,x) = dofmt_.Feform_(f,x) enddef ;
vardef Mformatstr(expr f,x) = dofmt_.Meform(f,x) enddef ;
vardef escaped_format(expr s) =
"" for n=1 upto length(s) : &
if ASCII substring (n,n+1) of s = 37 :
"@"
else :
substring (n,n+1) of s
fi
endfor
enddef ;
vardef dofmt_@#(expr f, x) =
textext("\MPgraphformat{" & escaped_format(f) & "}{" & (if string x : x else: decimal x fi) & "}")
% textext(mfun_format_number(escaped_format(f),x))
enddef ;
% We redefine autogrid from graph.mp adding the possibility of differing X and Y
% formats. Autoform is defined in graph.mp (by default "%g").
%
% string Autoform_X ; Autoform_X := "@.0e" ;
% string Autoform_Y ; Autoform_Y := "@.0e" ;
vardef autogrid(suffix tx, ty) text w =
Gneedgr_ := false ;
if str tx <> "" :
for x=auto.x :
tx (
if string Autoform_X :
if Autoform_X <> "" :
Autoform_X
else :
Autoform
fi
else :
Autoform
fi,
x) w ;
endfor
fi ;
if str ty <> "" :
for y=auto.y :
ty (
if string Autoform_Y :
if Autoform_Y <> "" :
Autoform_Y
else :
Autoform
fi
else :
Autoform
fi,
y) w ;
endfor
fi ;
enddef ;
% A couple of extensions:
% Define a vector function sym returning a picture: 10 different shapes,
% unfilled outline, interior filled with different shades of the background.
% Thus, overlapping points on a plot are more clearly distinguishable.
% grap_symsize := fontsize defaultfont ; % can be redefined
%
% dynamic version:
vardef grap_symsize =
% fontsize defaultfont
% .8ExHeight
.35BodyFontSize
enddef ;
path grap_sym[] ; % (internal) symbol path
grap_sym[0] := (0,0) ; % point
grap_sym[1] := fullcircle ; % circle
grap_sym[2] := (up -- down) scaled .5 ; % vertical bar
for i = 3 upto 9 : % polygons
grap_sym[i] := for j = 0 upto i-1 :
(up scaled .5) rotated (j*360/i) --
endfor cycle ;
endfor
grap_sym[12] := grap_sym[2] rotated +90 ; % horizontal line
grap_sym[22] := grap_sym[2] rotated +45 ; % backslash
grap_sym[32] := grap_sym[2] rotated -45 ; % slash
grap_sym[13] := grap_sym[3] rotated 180 ; % down triangle
grap_sym[23] := grap_sym[3] rotated -90 ; % right triangle
grap_sym[33] := grap_sym[3] rotated +90 ; % left triangle
grap_sym[14] := grap_sym[4] rotated +45 ; % square
grap_sym[15] := grap_sym[5] rotated 180 ; % down pentagon
grap_sym[16] := grap_sym[6] rotated +90 ; % turned hexagon
grap_sym[17] := grap_sym[7] rotated 180 ;
grap_sym[18] := grap_sym[8] rotated +22.5 ;
numeric l ;
for j = 5 upto 9 :
l := length(grap_sym[j]) ;
pair p[] ;
for i = 0 upto l :
p[i] = whatever [point i of grap_sym[j],
point (i+2 mod l) of grap_sym[j]] ;
p[i] = whatever [point (i+1 mod l) of grap_sym[j],
point (i+l-1 mod l) of grap_sym[j]] ;
endfor
grap_sym[20+j] := for i = 0 upto l : point i of grap_sym[j]--p[i]--endfor cycle ;
endfor
path s ; s := grap_sym[4] ;
path q ; q := s scaled .25 ;
numeric l ; l := length(s) ;
pair p[] ;
grap_sym[24] := for i = 0 upto l-1 :
hide(
p[i] = whatever [point i of s, point (i+1 mod l) of s] ;
p[i] = whatever [point i of q, point (i-1+l mod l) of q] ;
p[i+l] = whatever [point i of s, point (i+1 mod l) of s] ;
p[i+l] = whatever [point i+1 of q, point (i+2 mod l) of q] ;
)
point i of q -- p[i] -- p[i+l] --
endfor cycle ;
grap_sym[34] := grap_sym[24] rotated 45 ;
% usage: gdraw p plot plotsymbol(1,red,1) ; % a filled red circle
% usage: gdraw p plot plotsymbol(4,blue,0) ; % a blue square
% usage: gdraw p plot plotsymbol(14,green,0.5) ; % a 50% filled green diamond
def plotsymbol(expr n,c,f) = % (number,color,color|number)
if known grap_sym[n] :
image(
path p ; p := grap_sym[n] scaled grap_symsize ;
undraw p withpen currentpen scaled 2 ;
if cycle p : fill p withcolor
if color f and known f :
f
elseif numeric f and known f and color c and known c :
f[background,c]
elseif numeric f and known f :
f[background,black]
else :
background
fi ;
fi
draw p if color c and known c : withcolor c fi ;
)
else :
nullpicture
fi
enddef ;
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