Created
November 15, 2012 14:26
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SVG textPath placement
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>SVG Swarm</title> | |
| <style> | |
| svg { | |
| position: absolute; | |
| top: 0; | |
| } | |
| use { | |
| stroke:#000; | |
| stroke-width:2; | |
| } | |
| </style> | |
| <div id="fps">FPS: <span>?</span></div> | |
| <script src="http://d3js.org/d3.v2.min.js?2.9.1"></script> | |
| <script> | |
| var data = [[0,0],[0,1]]; | |
| var width = 960, | |
| height = 500; | |
| var x = d3.scale.linear() | |
| .domain([0, 1]) | |
| .range([0, width]); | |
| var y = d3.scale.linear() | |
| .domain([0, 1]) | |
| .range([0, height]); | |
| var time0 = Date.now(), | |
| time1; | |
| var fps = d3.select("#fps span"); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var use = svg.append('defs').append('path').attr('id', 'path-use') | |
| .data([data]) | |
| .attr("d", function(d) { | |
| return 'M' + d.map(function(a) { | |
| return [x(a[0]), y(a[1])]; | |
| }).join('L'); | |
| }); | |
| var p = svg.append("use").attr('xlink:href', '#path-use'); | |
| var test = svg.append("text").append('textPath').attr('xlink:href', '#path-use').text('the quick brown fox jumped over the lazy dog'); | |
| var fpsqueue = []; | |
| var forward = true; | |
| d3.timer(function() { | |
| if (forward) { | |
| data[1][0] += 0.01; | |
| data[0][0] += 0.01; | |
| } else { | |
| data[1][0] -= 0.01; | |
| data[0][0] -= 0.01; | |
| } | |
| if (data[1][0] > 1) forward = false; | |
| if (data[1][0] < 0) forward = true; | |
| use.attr("d", function(d) { | |
| return 'M' + d.map(function(a) { | |
| return [x(a[0]), y(a[1])]; | |
| }).join('L'); | |
| }); | |
| // p.attr('xlink:href', '#path-use'); | |
| time1 = Date.now(); | |
| if (fpsqueue.length === 200) { fps.text(d3.mean(fpsqueue).toFixed(3)); fpsqueue = []; } | |
| fpsqueue.push(Math.round(1000 / (time1 - time0))); | |
| time0 = time1; | |
| }); | |
| </script> |
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