Created
September 14, 2018 14:59
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Performance comparsion of SVG point along path - fast version
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <style> | |
| path { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 3px; | |
| } | |
| circle { | |
| stroke: #fff; | |
| stroke-width: 3px; | |
| } | |
| </style> | |
| <script src="https://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var points = [ | |
| [480, 200], | |
| [580, 400], | |
| [680, 100], | |
| [780, 300], | |
| [180, 300], | |
| [280, 100], | |
| [380, 400] | |
| ]; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", 960) | |
| .attr("height", 500); | |
| var path = svg.append("path") | |
| .data([points]) | |
| .attr("d", d3.svg.line() | |
| .tension(0) // Catmull–Rom | |
| .interpolate("cardinal-closed")); | |
| svg.selectAll(".point") | |
| .data(points) | |
| .enter().append("circle") | |
| .attr("r", 4) | |
| .attr("transform", function(d) { return "translate(" + d + ")"; }); | |
| var colorScale = d3.scale.category20().domain(Array.apply(null,Array(20)).map(function(d,i){return i})); | |
| var circle = svg.selectAll("some").data(d3.range(100)).enter().append("circle") | |
| .attr("r", function(d,i){return 10+Math.random()*10}) | |
| .attr("fill",function(d,i){return colorScale(i)}) | |
| .attr("transform", "translate(" + points[0] + ")"); | |
| transition(); | |
| function transition() { | |
| var counter = 0; | |
| circle.each(function(d,i){ | |
| counter++; | |
| d3.select(this).transition() | |
| .duration(function(){return 2080 + i * 80}) | |
| .tween("transform", translateAlong(path.node())) | |
| .each("end", function(){ | |
| --counter; | |
| if(!counter){transition();} | |
| }); | |
| }) | |
| } | |
| // Returns an attrTween for translating along the specified path element. | |
| function translateAlong(path){ | |
| var points = path.__points || collectPoints(path); | |
| return function (d,i){ | |
| var transformObj = this.transform.baseVal[0]; | |
| return function(t){ | |
| var index = t * 1000 | 0, | |
| point = points[index]; | |
| transformObj.setTranslate(point[0],point[1]); | |
| } | |
| } | |
| } | |
| function collectPoints(path) { | |
| var l = path.getTotalLength(), | |
| step = l*1e-3, | |
| points = []; | |
| for(var i = 0,p;i<=1000;++i){ | |
| p = path.getPointAtLength(i*step); | |
| points.push([p.x,p.y]); | |
| } | |
| return path.__points = points; | |
| } | |
| </script> | |
| </body> |
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