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map + point translation
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <style> | |
| .land { | |
| fill: #eee; | |
| stroke: #777777; | |
| } | |
| circle { | |
| fill: steelblue; | |
| stroke: #fff; | |
| stroke-width: 3px; | |
| } | |
| .journey{ | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 4; | |
| stroke-dasharray: 4px,8px; | |
| } | |
| </style> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script src="http://d3js.org/d3.geo.projection.v0.min.js"></script> | |
| <script src="http://d3js.org/queue.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var projection = d3.geo.conicConformal() | |
| .rotate([98, 0]) | |
| .center([0, 38]) | |
| .parallels([29.5, 45.5]) | |
| .scale(1000) // Change to 300 to zoom out | |
| .translate([width / 2, height / 2]); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var points = [ | |
| [-122.2728, 37.8717], | |
| [-104.9903, 39.7392], | |
| [-93.2650, 44.9778], | |
| [-75.6008, 41.0144], | |
| [-86.7833, 36.1667], | |
| [-96.7970, 32.7767], | |
| [-110.9264,32.2217] | |
| ]; | |
| var line = d3.svg.line() | |
| .interpolate("cardinal-closed") | |
| .x(function(d) { return projection(d)[0]; }) | |
| .y(function(d) { return projection(d)[1]; }); | |
| queue() | |
| .defer(d3.json, "http://mtaptich.github.io/d3-lessons/d3-maps/state_pol.json") | |
| .await(ready); | |
| function ready (error, us) { | |
| svg.append("g") | |
| .attr("class", "land") | |
| .selectAll("path") | |
| .data(topojson.feature(us, us.objects.state_pol).features) | |
| .enter().append("path") | |
| .attr("class", function(d) {return d.id}) | |
| .attr("d", path) | |
| var linepath = svg.append("path") | |
| .data([points]) | |
| .attr("d", line) | |
| .attr('class', 'journey'); | |
| svg.selectAll(".point") | |
| .data(points) | |
| .enter().append("circle") | |
| .attr("r", 8) | |
| .attr("transform", function(d) { return "translate(" + projection(d) + ")"; }); | |
| var circle = svg.append("circle") | |
| .attr("r", 19) | |
| .attr("transform", "translate(" + projection(points[0]) + ")"); | |
| // Create a loop by calling 'itself' as a callback function | |
| transition(); | |
| function transition() { | |
| circle.transition() | |
| .duration(10000) | |
| .attrTween("transform", translateAlong(linepath.node())) | |
| .each("end", transition); | |
| } | |
| }; | |
| // Returns an attrTween for translating along the specified path element. | |
| function translateAlong(path) { | |
| var l = path.getTotalLength(); | |
| return function(d, i, a) { | |
| return function(t) { | |
| var p = path.getPointAtLength(t * l); | |
| return "translate(" + p.x + "," + p.y + ")"; | |
| }; | |
| }; | |
| } | |
| </script> |
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