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Diffstat (limited to 'metapost/context/base/mp-grap.mpiv')
| -rw-r--r-- | metapost/context/base/mp-grap.mpiv | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/metapost/context/base/mp-grap.mpiv b/metapost/context/base/mp-grap.mpiv new file mode 100644 index 000000000..757413a1c --- /dev/null +++ b/metapost/context/base/mp-grap.mpiv @@ -0,0 +1,204 @@ +%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 ; |