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Animate path in D3
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/> | |
| <style type="text/css"> | |
| #line{ | |
| width: 100%; | |
| margin: 20px 0; | |
| height: 300px; | |
| } | |
| .old { | |
| stroke: lightgrey; | |
| stroke-dasharray: 5; | |
| stroke-dashoffset: 5; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="line"></div> | |
| <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.4.1/d3.min.js"></script> | |
| <script type="text/javascript"> | |
| var w = window.innerWidth; | |
| var h = 100; | |
| var svg = d3.select("#line") | |
| .append("svg") | |
| .attr("width", w) | |
| .attr("height", h) | |
| .attr("id", "visualization"); | |
| var x = d3.scaleLinear().domain([0, 10]).range([0, w]); | |
| var y = d3.scaleLinear().domain([0, 10]).range([10, h - 10]); | |
| var line = d3.line() | |
| .x(function(d,i) {return x(i);}) | |
| .y(function(d) {return y(d);}) | |
| .curve(d3.curveNatural) | |
| // data is created inside the function so it is always unique | |
| let repeat = () => { | |
| var data = d3.range(11).map(function(){return Math.random()*10}) | |
| // Uncomment following line to clear the previously drawn line | |
| //svg.selectAll("path").remove(); | |
| // Set a light grey class on old paths | |
| svg.selectAll("path").attr("class", "old"); | |
| var path = svg.append("path") | |
| .attr("d", line(data)) | |
| .attr("stroke", "darkgrey") | |
| .attr("stroke-width", "2") | |
| .attr("fill", "none"); | |
| var totalLength = path.node().getTotalLength(); | |
| path | |
| .attr("stroke-dasharray", totalLength + " " + totalLength) | |
| .attr("stroke-dashoffset", totalLength) | |
| .transition() | |
| .duration(4000) | |
| .ease(d3.easeLinear) | |
| .attr("stroke-dashoffset", 0) | |
| .on("end", repeat); | |
| }; | |
| repeat(); | |
| </script> | |
| </body> | |
| </html> |
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