Created
August 18, 2012 06:56
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labeled arrow w/ D3.js
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| <!DOCTYPE HTML> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title></title> | |
| <script src="http://d3js.org/d3.v2.js"></script> | |
| <style> | |
| line.arrow { | |
| stroke: #666; | |
| stroke-width: 1px; | |
| } | |
| marker#arrow { | |
| fill: #666; | |
| } | |
| .link-label { | |
| font-family: sans-serif; | |
| font-size: 11px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var nodes = [{x:80,y:150}, {x:40,y:10}, {x:200,y:30}]; | |
| var links = [{s:0,t:1,label:"foo"}, {s:0,t:2,label:"bar"}]; | |
| var w = 300; | |
| var h = 300; | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", w) | |
| .attr("height", h); | |
| // define marker | |
| svg.append("svg:defs").selectAll("marker") | |
| .data(["arrow"]) | |
| .enter().append("svg:marker") | |
| .attr("id", String) | |
| .attr("viewBox", "0 -5 10 10") | |
| .attr("refX", 10) | |
| .attr("refY", 0) | |
| .attr("markerWidth", 10) | |
| .attr("markerHeight", 10) | |
| .attr("orient", "auto") | |
| .append("svg:path") | |
| .attr("d", "M0,-5L10,0L0,0"); | |
| svg.selectAll("line") | |
| .data(links) | |
| .enter() | |
| .append("svg:line") | |
| .attr("x1", function(d) { return nodes[d.s].x; }) | |
| .attr("y1", function(d) { return nodes[d.s].y; }) | |
| .attr("x2", function(d) { return nodes[d.t].x; }) | |
| .attr("y2", function(d) { return nodes[d.t].y; }) | |
| .attr("class", "link arrow") | |
| .attr("marker-end", "url(#arrow)"); | |
| svg.selectAll("text") | |
| .data(links) | |
| .enter() | |
| .append("svg:g") | |
| .append("svg:text") | |
| .text(function(d) { return d.label; }) | |
| .attr("class", "link-label") | |
| .attr("text-anchor", "middle") | |
| .attr("transform", function(d) { | |
| var dx = (nodes[d.t].x - nodes[d.s].x), | |
| dy = (nodes[d.t].y - nodes[d.s].y); | |
| var dr = Math.sqrt(dx * dx + dy * dy); | |
| var offset = (1 - (1 / dr)) / 2; | |
| var deg = 180 / Math.PI * Math.atan2(dy, dx); | |
| var x = (nodes[d.s].x + dx * offset); | |
| var y = (nodes[d.s].y + dy * offset); | |
| return "translate(" + x + ", " + y + ") rotate(" + deg + ")"; | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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