Marker animation along SVG "path" element with D3.js: animating "path" and marker movement synchronously.
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December 28, 2013 19:08
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Marker animation along SVG <path> element with D3.js II
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <meta charset="utf-8"> | |
| <head> | |
| <title>SVG path animation</title> | |
| <link href="style.css" rel="stylesheet"> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/queue.v1.min.js"></script> | |
| </head> | |
| <body> | |
| <!-- start --> | |
| <div id="pathAnimation"> | |
| <script src="pathFollowAnimation.js"></script> | |
| </div> | |
| <!-- end --> | |
| </body> | |
| </html> |
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| queue() | |
| .defer(d3.xml, "wiggle.svg", "image/svg+xml") | |
| .await(ready); | |
| function ready(error, xml) { | |
| //Adding our svg file to HTML document | |
| var importedNode = document.importNode(xml.documentElement, true); | |
| d3.select("#pathAnimation").node().appendChild(importedNode); | |
| var svg = d3.select("svg"); | |
| var path = svg.select("path#wiggle").call(transition); | |
| var startPoint = pathStartPoint(path); | |
| var marker = svg.append("circle"); | |
| marker.attr("r", 7) | |
| .attr("id", "marker") | |
| .attr("transform", "translate(" + startPoint + ")"); | |
| //Get path start point for placing marker | |
| function pathStartPoint(path) { | |
| var d = path.attr("d"), | |
| dsplitted = d.split(" "); | |
| return dsplitted[1]; | |
| } | |
| function transition(path) { | |
| path.transition() | |
| .duration(7500) | |
| .attrTween("stroke-dasharray", tweenDash) | |
| .each("end", function() { d3.select(this).call(transition); });// infinite loop | |
| } | |
| function tweenDash() { | |
| var l = path.node().getTotalLength(); | |
| var i = d3.interpolateString("0," + l, l + "," + l); // interpolation of stroke-dasharray style attr | |
| return function(t) { | |
| var marker = d3.select("#marker"); | |
| var p = path.node().getPointAtLength(t * l); | |
| marker.attr("transform", "translate(" + p.x + "," + p.y + ")");//move marker | |
| return i(t); | |
| } | |
| } | |
| } |
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| path { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 1px; | |
| } | |
| circle { | |
| fill: red; | |
| } |
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| <svg | |
| xmlns="http://www.w3.org/2000/svg" | |
| width="960" | |
| height="500" | |
| version="1.1" | |
| id="svg"> | |
| <path | |
| d="m 480,200 c 100,0 0,250 100,200 100,-50 0,-250 100,-300 100,-50 350,100 100,200 -250,100 -350,100 -600,0 -250,-100 0,-250 100,-200 100,50 0,250 100,300 100,50 0,-200 100,-200" | |
| id="wiggle" | |
| class="weirdPath"/> | |
| </svg> |
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Hello, I viewed your demo http://bl.ocks.org/KoGor/8163022 with several browsers.
The animation looks great on Chrome, Safari, but on Firefox the red point is much ahead of its path. Could you please check whether this problem can be fixed? Thank you.