diff options
Diffstat (limited to 'metapost/context/base/mpiv/mp-node.mpiv')
| -rw-r--r-- | metapost/context/base/mpiv/mp-node.mpiv | 115 |
1 files changed, 82 insertions, 33 deletions
diff --git a/metapost/context/base/mpiv/mp-node.mpiv b/metapost/context/base/mpiv/mp-node.mpiv index fdd308ad1..c84377da1 100644 --- a/metapost/context/base/mpiv/mp-node.mpiv +++ b/metapost/context/base/mpiv/mp-node.mpiv @@ -11,31 +11,92 @@ %C therefore copyrighted by \PRAGMA. See mreadme.pdf for %C details. -%D Ths crossing macros were written as part of this module but as they +%D The crossing macros were written as part of this module but as they %D can be of use elsewhere they are defined in mp-tool. if known context_node : endinput ; fi ; boolean context_node ; context_node := true ; +% Build a path from the node positions. +% Must be integer and continuous in index starting at 0. + +vardef makenodepath(suffix p) = + if unknown p : + if not path p : + d := dimension p ; + if d>0 : + scantokens("path " & prefix p & for i=1 upto d : "[]" & endfor " ;") ; + else : + path p ; + fi + fi + save i ; i = -1 ; + p = forever : exitif unknown p.pos[incr i] ; + p.pos[i] -- + endfor cycle ; + fi +enddef ; + +def clearnodepath suffix p = + save p ; path p ; +enddef ; + +clearnodepath nodepath ; + +vardef makenode@#(text t) = + for a = t : + if (known a) and (numeric a) : + _makenode(nodepath, t) + else : + _makenode(t) + fi + exitif true ; + endfor +enddef ; + +vardef node@#(text t) = + for a = t : + if (known a) and (numeric a) : + _node(nodepath, t) + else : + _node(t) + fi + exitif true ; + endfor +enddef ; + +vardef nodeboundingpoint@#(text t) = + for a = t : + if (known a) and (numeric a) : + _nodeboundingpoint@#(nodepath,a) + else : + _nodeboundingpoint@#(t) + fi + exitif true ; + endfor +enddef ; + +vardef fromto@#(expr d,f)(text t) = + fromtopaths(d,nodepath,f,nodepath,t) +enddef ; + % returns a pair suffix if the path is unknown -vardef makenode@#(suffix p)(text t) = - save i, b ; numeric i ; string b ; +vardef _makenode@#(suffix p)(text t) = + save i, d, b ; numeric i, d ; string b ; for a = t : if unknown i : % first argument is the index i = a ; - if isarray p : - % - % note that one needs to declare "path p[] ; picture p[]pic[] ;" - % before calling node() if one is to use a pseudo-array for p - % because "picture p1.pic[] ;" is not a valid syntax! - % - % The following works, but is a bit awkward... - % + d = dimension p ; + if d > 0 : b := prefix p ; - if not picture p.pic[i] : scantokens("picture " & b & "[]pic[] ;") ; fi - if not pair p.pos[i] : scantokens("pair " & b & "[]pos[] ;") ; fi + if not picture p.pic[i] : scantokens("picture " & b & + for j=1 upto d : "[]" & endfor + "pic[] ;") ; fi + if not pair p.pos[i] : scantokens("pair " & b & + for j=1 upto d : "[]" & endfor + "pos[] ;") ; fi else : if not picture p.pic[i] : picture p.pic[] ; fi if not pair p.pos[i] : pair p.pos[] ; fi @@ -44,12 +105,12 @@ vardef makenode@#(suffix p)(text t) = if known p.pic[i] : addto p.pic[i] also else : - p.pic[i] := + p.pic[i] = fi if picture a : a elseif string a : textext@#(a) elseif numeric a : textext@#(decimal a) - elseif ((boolean a) and a) : image(draw origin) + elseif ((boolean a) and a) : image(draw origin withpen currentpen scaled 4) else : nullpicture fi ; fi @@ -59,10 +120,11 @@ enddef ; % returns a picture -vardef node@#(suffix p)(text t) = - if pair makenode@#(p)(t) : - % nop: gobble the function return. +vardef _node@#(suffix p)(text t) = + if pair _makenode@#(p,t) : + % nop: enclose in "if ... fi" to gobble the function return. fi + % now pick-off only the index: for a = t : if (unknown p) and (known p.pos[a]) : makenodepath(p) ; @@ -78,7 +140,7 @@ enddef ; % returns a path -vardef fromto@#(expr d)(suffix p)(expr f)(suffix q)(text s) = +vardef fromtopaths@#(expr d)(suffix p)(expr f)(suffix q)(text s) = save r, t, l ; path r[] ; numeric t ; picture l ; for a = s : @@ -140,7 +202,7 @@ enddef ; % returns pair: bounding point of the node picture -vardef nodeboundingpoint@#(suffix p)(expr i) = +vardef _nodeboundingpoint@#(suffix p)(expr i) = if known p.pic[i] : boundingpoint@#(p.pic[i]) else : @@ -167,16 +229,3 @@ vardef betweennodes@#(suffix p)(expr f)(suffix q)(text s) = fi endfor enddef ; - -% build a path from the node positions. -% Must be continuous in index starting at 0. - -vardef makenodepath(suffix p) = - if unknown p : - save i ; i = -1 ; - p = forever : exitif unknown p.pos[incr i] ; - p.pos[i] -- - endfor cycle ; - fi -enddef ; - |