Created
November 13, 2015 10:56
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d3 interpolation
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <style> | |
| path { | |
| fill: none; | |
| stroke: steelblue; | |
| stroke-width: 2px; | |
| } | |
| </style> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <script> | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", window.innerWidth) | |
| .attr("height", window.innerHeight); | |
| var trackData = [[ | |
| [480, 200], | |
| [580, 400], | |
| [680, 100], | |
| [780, 300], | |
| [180, 300], | |
| [280, 100], | |
| [380, 400] | |
| ],[ | |
| [480, 500], | |
| [580, 600], | |
| [680, 700], | |
| [780, 800], | |
| [180, 800], | |
| [280, 700], | |
| [380, 600] | |
| ]]; | |
| var tracks = svg.selectAll("g") | |
| .data(trackData) | |
| .enter() | |
| .append("path") | |
| .attr('points', function(d, i) { | |
| return [d]; | |
| }) | |
| .attr('id', function(d, i) { | |
| return "track-" + i; | |
| }) | |
| .attr("d", d3.svg.line() | |
| .tension(0) // Catmull–Rom | |
| .interpolate("linear") | |
| ); | |
| var cars = []; | |
| function refreshCars() { | |
| var circles = svg.selectAll("circle") | |
| .data(cars); | |
| circles.enter() | |
| .append("circle") | |
| .style("fill", "black") | |
| .attr("r", 10) | |
| .attr("id", function(d, i) { | |
| return "car-" + i; | |
| }) | |
| .attr("transform", function(d, i) { | |
| return "translate(" + trackData[d.track][0] + ")" | |
| }) | |
| .transition() | |
| .duration(10000) | |
| .ease("linear") | |
| .attrTween("transform", translateAlong(tracks[0])) | |
| .each("end", function(d, i) { | |
| this.remove(); | |
| }); | |
| circles.exit().remove(); | |
| // transition(); | |
| } | |
| function transition() { | |
| } | |
| function translateAlong(ph) { | |
| return function(d, i, a) { | |
| var l = ph[d.track].getTotalLength(); | |
| return function(t) { | |
| var p = ph[d.track].getPointAtLength(t * l); | |
| return "translate(" + p.x + "," + p.y + ")"; | |
| }; | |
| }; | |
| } | |
| function addCarToTrack(id) { | |
| var car = { | |
| "track": id | |
| } | |
| cars.push(car) | |
| refreshCars() | |
| setTimeout(function() { | |
| addCarToTrack(id) | |
| }, 1000); | |
| } | |
| addCarToTrack(0); | |
| addCarToTrack(1); | |
| </script> |
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