This is a simple example of a zoomable choropleth made with spam.js.
It encodes birth rates from 2014 in Barcelona census tracts.
Last active
October 28, 2017 15:55
-
-
Save martgnz/5d463feffb0f7367b3f2 to your computer and use it in GitHub Desktop.
Spam.js Choropleth I
This file contains 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
| license: mit | |
| height: 650 | |
| border: none |
This file contains 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> | |
| canvas { | |
| cursor: pointer; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <script src="https://d3js.org/topojson.v1.min.js"></script> | |
| <script src="https://unpkg.com/rbush@1.4.3/rbush.js"></script> | |
| <script src="https://unpkg.com/spamjs@1.1.0/spam.min.js"></script> | |
| <script type='text/javascript'> | |
| var hover = null; | |
| var color = d3.scale | |
| .threshold() | |
| .domain([6.03, 8.63, 11.28, 16.66, 23.59]) | |
| .range(["#f0f9e8", "#ccebc5", "#a8ddb5", "#7bccc4", "#43a2ca", "#0868ac"]); | |
| d3.json("bcn.json", function(error, d) { | |
| topojson.presimplify(d); | |
| var map = new ZoomableCanvasMap({ | |
| element: "body", | |
| zoomScaleFactor: 0.3, | |
| projection: d3.geo | |
| .mercator() | |
| .center([29.6, 30.47]) | |
| .scale(250000) | |
| .rotate([0, 0, -37.6]), | |
| width: 960, | |
| height: 650, | |
| data: [ | |
| { | |
| features: topojson.feature(d, d.objects["seccio-censal"]), | |
| static: { | |
| paintfeature: function(parameters, d) { | |
| parameters.context.fillStyle = color(d.properties.rate); | |
| parameters.context.fill(); | |
| } | |
| }, | |
| dynamic: { | |
| postpaint: function(parameters) { | |
| if (!hover) return; | |
| parameters.context.beginPath(); | |
| parameters.context.lineWidth = 1 / parameters.scale; | |
| parameters.path(hover); | |
| parameters.context.stroke(); | |
| } | |
| }, | |
| events: { | |
| hover: function(parameters, d) { | |
| hover = d; | |
| parameters.map.paint(); | |
| }, | |
| click: function(parameters, d) { | |
| parameters.map.zoom(d); | |
| } | |
| } | |
| } | |
| ] | |
| }); | |
| map.init(); | |
| }); | |
| </script> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment