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/*********************************************** |
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1. save this file as improveEdgeLabels.gvpr |
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2. what it does: it allows you to re-position Graphviz edge labels |
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3. command line example (works with any Graphviz engine): |
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dot myfile.gv |gvpr -cf improveEdgeLabels.gvpr |neato -n2 -Tpng >myfile.png |
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4. how to use: |
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improveEdgeLabels adds 3 new edge attributes to Graphviz: |
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- labelOverlay, labelAdjust, label2Node |
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- they can be used separately or in combination |
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- if labelOverlay=true |
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overlay label/xlabel on-top-of edge - centered |
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- if labelOverlay=n% (n is integer) |
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overlay label/xlabel on-top-of edge - n% of the way from tail-to-head |
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- if labelAdjust (X,Y) |
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adjust edge.lp by X,Y (either/both can be negative) |
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- if label2Node = true |
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delete the edge label |
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replace the edge label with a node, where pos=edge.lp |
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set node attributes |
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#### future: |
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- set/change various attributes of the new node |
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*************************************************/ |
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BEGIN{ |
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int i, cnt, LN=0; |
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string tStr, tok[int]; |
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graph_t Root; |
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// do NOT call with direct output from sprintf - there is a bug - string will be empty |
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void doError(string eString) { |
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printf(2, "Error:: %s\n", eString); |
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} |
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//////////////////////////////////////////////////////////////////// |
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int istrue(string checkme, int rc) { |
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checkme = tolower(checkme); |
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if (checkme == "@(1|yes|true)") // ksh syntax |
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rc=1; |
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else |
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rc=0; |
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return(rc); |
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} |
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///////////////////////////////////////////////////////////////// |
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string overlayPos(string Pos, string cmd) { |
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string p1, p2, pnew; |
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float x1, y1, x2, y2, dx, dy, percent; |
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p1=""; |
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if (cmd=="(+([0-9])\%)") { |
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percent=.01 * (float)sub(cmd,"%"); |
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} else { |
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percent=.5; |
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} |
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cnt=tokens(Pos, tok); |
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for (i=0; i<cnt; i++) { |
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if (tok[i]=="[es]*") |
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continue; |
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if (p1=="") { |
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p1=tok[i]; |
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} |
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if (i==cnt-1) |
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p2=tok[i]; |
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} |
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//print("// cmd: ", cmd, " p1: ", p1," p2: ",p2); |
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//print("// PERCENT: ", percent ); |
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x1=(float)xOf(p1); |
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x2=(float)xOf(p2); |
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y1=(float)yOf(p1); |
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y2=(float)yOf(p2); |
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dx=x2-x1; |
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dy=y2-y1; |
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return (string)(x1 + percent*dx) + ", " + (string)(y1 + percent*dy); |
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} |
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/////////////////////////////////////////////////////////////////// |
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string adjustPos(string Pos, string adj) { |
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string newPt; |
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newPt=(string)((float)xOf(Pos) + (float)xOf(adj)) + ", " + (string)((float)yOf(Pos) + (float)yOf(adj)); |
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return newPt; |
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} |
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} |
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BEG_G{ |
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Root=$G; |
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$G.notranslate="true"; // fighting pos changes for created nodes |
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if (!(hasAttr(Root, "splines") && Root.splines!="")) |
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Root.splines="true"; |
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} |
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N{ |
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$.REALLY_USE_THIS_pos=$.pos; |
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} |
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E{ |
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if (hasAttr($, "labelOverlay")) { |
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if (istrue($.labelOverlay) || $.labelOverlay=="(+([0-9])\%)") { |
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if (hasAttr($, "lp") && $.lp!="") { |
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$.preOverlaylp=$.lp; |
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$.lp=overlayPos($.pos, $.labelOverlay); |
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} |
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} else { |
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doError("For edge " + $.name + ", invalid value (" + $.labelOverlay + ") for labelOverlay attribute"); |
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} |
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} |
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if (hasAttr($, "labelAdjust") && ($.labelAdjust!="")) { |
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if (hasAttr($, "lp") && $.lp!="") { |
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$.preAdjustlp=$.lp; |
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$.lp=adjustPos($.lp, $.labelAdjust); |
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} |
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} |
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if (hasAttr($, "label2node") && istrue($.label2node)) { |
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node_t aNode; |
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string lbl, rep, s1, s2; |
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if (hasAttr($, "lp") && $.lp!="") { |
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$.preL2Nlp=$.lp; |
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$.preL2Nlabel=$.label; |
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//// create node |
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tStr="__labelNODE__" + (string)++LN; |
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aNode=node($G, tStr); |
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lbl=$.label; |
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rep=$.tail.name; |
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/********** problem w/ gsub, so roll our own ***********/ |
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print ("// escape stuff >", lbl); |
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while (i=index(lbl,"\\T"), i!=-1) { |
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//print ("// x ", lbl, " ",i); |
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if (i>0) |
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s1=substr(lbl,0,i-1); |
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else |
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s1=""; |
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if (i<(length(lbl)-2)) |
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s2=substr(lbl,i+1); |
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else |
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s2=""; |
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lbl=s1 + rep + s2; |
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} |
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print("// lbl:", lbl); |
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while (i=index(lbl,"\H"), i!=-1) { |
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//print ("// y ", lbl, " ",i); |
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lbl=substr(lbl,0,i-1) + rep + substr(lbl,i+1); |
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} |
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//print("// lbl:", lbl); |
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while (i=index(lbl,"\E"), i!=-1) { |
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//print ("// z ", lbl, " ",i); |
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lbl=substr(lbl,0,i-1) + rep + substr(lbl,i+1); |
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} |
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//print("// lbl:", lbl); |
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aNode.label=lbl; |
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aNode.shape="plaintext"; |
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aNode.style="filled"; |
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aNode.width=".05"; |
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aNode.height=".05"; |
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aNode.margin="0.01,0.01"; |
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aNode.fillcolor="white"; |
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aNode.pos=$.lp; |
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// clean-up edge attributes |
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$.label=""; |
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$.lp=""; |
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$._comment="edge label replaced by " + tStr; |
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} |
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} |
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} |
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/******************* test graph ************************** |
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graph straight { |
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splines=false |
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edge [label="\T" labelOverlay=true color=purple] |
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node [shape=rect style=filled fillcolor=lightblue] |
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a1 -- b1 |
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c1 -- d1 [labelOverlay="15%" label=high] |
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e1 -- f1 [label2node=true labelOverlay="75%" label=low] |
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g1:sw -- h1:nw |
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g1:s -- h1:n [labelOverlay="20%"] |
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g1:se -- h1:ne |
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j1 -- k1 [ label2node=true] |
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node[shape=square style=filled fillcolor=lightgreen] |
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{rank=sink |
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edge [fontcolor=red] |
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Aaa -- B3 [labelOverlay="33%"] |
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C98 -- D3 [labelOverlay="80%" label2node=true] |
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Eee -- F6 [label="adjust me" labelAdjust="45,-25"] |
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G12 -- H3 [label2node=true] |
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node [shape=plain fontcolor=blue style=""] |
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Lxx -- M123 |
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Noo -- Ooo [label2node=true] |
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node [shape=oval fontcolor=blue style=""] |
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P -- Q |
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} |
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node[shape=circle style=filled fillcolor=pink] |
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edge [label2node=true label="aeiou" labelOverlay="78%"] |
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10 -- {11 12} |
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10 -- 13 [labelOverlay="38%"] |
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10 -- 14 [labelOverlay="62%"] |
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edge [label="three"] |
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node [shape=Mrecord] |
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13 -- 21 |
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edge [labelOverlay="55%" label="T\nh\nr\ne\ne\n \n33"] 13 -- 22 |
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edge [labelOverlay="60%"] 13 -- 23 |
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} |
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*************************************************/ |
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