This example belongs to the presentation made to the OSGeo local group in Barcelona Geoinquiets The example is an adaptation from Mike Bostock's Symbol Map example
Last active
December 15, 2015 01:39
-
-
Save rveciana/5181095 to your computer and use it in GitHub Desktop.
D3 tutorial IV: Adding points
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .states { | |
| fill: #ccc; | |
| stroke: #fff; | |
| } | |
| .symbol { | |
| fill: steelblue; | |
| fill-opacity: .8; | |
| stroke: #fff; | |
| } | |
| </style> | |
| <body> | |
| <button type="button" id="change">Change</button> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v0.min.js"></script> | |
| <script src="http://d3js.org/queue.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var states, points; | |
| var radius = d3.scale.sqrt() | |
| .domain([0, 1e6]) | |
| .range([0, 10]); | |
| var projection = d3.geo.mercator() | |
| .center([-97,37]) | |
| .scale(4000 / 2 / Math.PI) | |
| .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); | |
| queue() | |
| .defer(d3.json, "/mbostock/raw/4090846/us.json") | |
| .defer(d3.json, "/mbostock/raw/3750900/us-state-centroids.json") | |
| .await(ready); | |
| function ready(error, us, centroid) { | |
| states = svg.append("path") | |
| .attr("class", "states") | |
| .datum(topojson.object(us, us.objects.states)) | |
| .attr("d", path); | |
| points = svg.selectAll(".symbol") | |
| .data(centroid.features.sort(function(a, b) { return b.properties.population - a.properties.population; })) | |
| .enter().append("path") | |
| .attr("class", "symbol") | |
| .attr("d", path.pointRadius(function(d) { if(d.properties) { return radius(d.properties.population);} else {return;} })); | |
| }; | |
| d3.select("#change").on("click", function() { | |
| projection = d3.geo.albers(); | |
| path.projection(projection); | |
| states.transition() | |
| .duration(10000) | |
| .attr("d", path); | |
| points.transition() | |
| .duration(3000) | |
| .attr("d", path); | |
| }); | |
| </script> | |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment