[ { "path": ".gitignore", "content": "node_modules\n*.swp\n" }, { "path": ".travis.yml", "content": "language: node_js\nnode_js:\n - \"4.0\"\nbranches:\n only:\n - gh-pages" }, { "path": "LICENSE.md", "content": "The MIT License (MIT)\n\nCopyright (c) 2015 Tim Wisniewski\n\nPermission is hereby granted, free of charge, to any person obtaining a copy\nof this software and associated documentation files (the \"Software\"), to deal\nin the Software without restriction, including without limitation the rights\nto use, copy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the Software is\nfurnished to do so, subject to the following conditions:\n\nThe above copyright notice and this permission notice shall be included in all\ncopies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\nFITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\nAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\nLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\nOUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\nSOFTWARE.\n" }, { "path": "README.md", "content": "# Leaflet Choropleth [![Build Status](https://travis-ci.org/timwis/leaflet-choropleth.svg?branch=gh-pages)](https://travis-ci.org/timwis/leaflet-choropleth) [![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg)](http://standardjs.com/)\n\n[![NPM](https://nodei.co/npm/leaflet-choropleth.png?compact=true)](https://nodei.co/npm/leaflet-choropleth/)\n\nChoropleth plugin for Leaflet (color scale based on value) - [Demo](http://timwis.com/leaflet-choropleth/examples/basic)\n\n[![screenshot](http://i.imgur.com/5DXlLG8l.jpg)](http://timwis.com/leaflet-choropleth/examples/basic)\n\nThis plugin extends `L.geoJson`, giving each feature a `style.fillColor` that corresponds to a specified value \nin its `properties` object. For information on how to use `L.geoJson`, see the Leaflet \n[tutorial](http://leafletjs.com/examples/geojson.html) and [documentation](http://leafletjs.com/reference.html#geojson).\n\nWhile Leaflet provides a [choropleth tutorial](http://leafletjs.com/examples/choropleth.html), that approach requires you to\nspecify exact breakpoints and colors. This plugin uses [chroma.js](http://gka.github.io/chroma.js/) to abstract that for you.\nJust tell it which property in the GeoJSON to use and some idea of the color scale you want.\n\n## Usage\n```javascript\nL.choropleth(geojsonData, {\n\tvalueProperty: 'incidents', // which property in the features to use\n\tscale: ['white', 'red'], // chroma.js scale - include as many as you like\n\tsteps: 5, // number of breaks or steps in range\n\tmode: 'q', // q for quantile, e for equidistant, k for k-means\n\tstyle: {\n\t\tcolor: '#fff', // border color\n\t\tweight: 2,\n\t\tfillOpacity: 0.8\n\t},\n\tonEachFeature: function(feature, layer) {\n\t\tlayer.bindPopup(feature.properties.value)\n\t}\n}).addTo(map)\n```\n### Advanced\n* **colors**: If you prefer to specify your own exact colors, use `colors: ['#fff', '#777', ...]` instead of `scale`.\nJust make sure the number of colors is the same as the number of `steps` specified.\n* **valueProperty**: To use computed values (such as [standardizing](http://axismaps.github.io/thematic-cartography/articles/standardize.html)),\nyou can use a function for `valueProperty` that is passed `(feature)` and returns a number ([example](examples/computed_values/demo.js)).\n\n## Installation\n* via NPM: `npm install leaflet-choropleth`\n* via Bower: `bower install leaflet-choropleth`\n\nInclude `dist/choropleth.js` from this repository on your page after Leaflet:\n```html\n\n\n```\nOr, if using via CommonJS (Browserify, Webpack, etc.):\n```javascript\nvar L = require('leaflet')\nrequire('leaflet-choropleth')\n```\n\n## Examples\n* [Basic usage](examples/basic/demo.js)\n* [Legend](examples/legend/demo.js)\n* [Fetch & join](examples/fetch_join/demo.js)\n* [Computed values](examples/computed_values/demo.js) \n\n## Development\nThis project uses [webpack](http://webpack.github.io/) to build the JavaScript and \n[standard](https://github.com/feross/standard) for code style linting.\n\n* While developing, use `npm run watch` to automatically rebuild when files are saved\n* Use `npm test` to run unit tests and code style linter\n* Before committing `dist/`, use `npm run build` to optimize and minify for production use\n" }, { "path": "bower.json", "content": "{\n \"name\": \"leaflet-choropleth\",\n \"version\": \"1.1.2\",\n \"homepage\": \"https://github.com/timwis/leaflet-choropleth\",\n \"authors\": [\n \"timwis \"\n ],\n \"description\": \"Choropleth plugin for Leaflet (color scale based on value)\",\n \"main\": \"dist/choropleth.js\",\n \"keywords\": [\n \"leaflet\",\n \"choropleth\",\n \"chloropleth\"\n ],\n \"license\": \"MIT\",\n \"ignore\": [\n \"**/.*\",\n \"node_modules\",\n \"bower_components\",\n \"test\",\n \"tests\"\n ]\n}\n" }, { "path": "dist/choropleth.js", "content": "!function(n){function r(e){if(t[e])return t[e].exports;var o=t[e]={exports:{},id:e,loaded:!1};return n[e].call(o.exports,o,o.exports,r),o.loaded=!0,o.exports}var t={};return r.m=n,r.c=t,r.p=\"\",r(0)}([function(n,r,t){var 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Array(t),en=!0,R=0,m=null,m=[],m.push(P),_=o=1,Z=t-1;1<=Z?o<=Z:o>=Z;_=1<=Z?++o:--o)m.push(P+_/t*(Q-P));for(m.push(Q);en;){for(O=u=0,J=t-1;0<=J?u<=J:u>=J;O=0<=J?++u:--u)w[O]=0;for(_=f=0,W=L-1;0<=W?f<=W:f>=W;_=0<=W?++f:--f){for(cn=ln[_],B=Number.MAX_VALUE,O=a=0,H=t-1;0<=H?a<=H:a>=H;O=0<=H?++a:--a)j=b(m[O]-cn),j=nn;O=0<=nn?++c:--c)q[O]=null;for(_=i=0,rn=L-1;0<=rn?i<=rn:i>=rn;_=0<=rn?++i:--i)x=g[_],null===q[x]?q[x]=ln[_]:q[x]+=ln[_];for(O=l=0,tn=t-1;0<=tn?l<=tn:l>=tn;O=0<=tn?++l:--l)q[O]*=1/w[O];for(en=!1,O=s=0,C=t-1;0<=C?s<=C:s>=C;O=0<=C?++s:--s)if(q[O]!==m[_]){en=!0;break}m=q,R++,R>200&&(en=!1)}for(N={},O=p=0,X=t-1;0<=X?p<=X:p>=X;O=0<=X?++p:--p)N[O]=[];for(_=d=0,K=L-1;0<=K?d<=K:d>=K;_=0<=K?++d:--d)x=g[_],N[x].push(ln[_]);for(fn=[],O=h=0,V=t-1;0<=V?h<=V:h>=V;O=0<=V?++h:--h)fn.push(N[O][0]),fn.push(N[O][N[O].length-1]);for(fn=fn.sort(function(n,r){return n-r}),A.push(fn[0]),_=v=1,z=fn.length-1;v<=z;_=v+=2)an=fn[_],isNaN(an)||A.indexOf(an)!==-1||A.push(an)}return A},R=function(n,r,t){var e,o,u,f;return e=An(arguments),n=e[0],r=e[1],t=e[2],isNaN(n)&&(n=0),n/=360,n<1/3?(o=(1-r)/3,f=(1+r*N(l*n)/N(c-l*n))/3,u=1-(o+f)):n<2/3?(n-=1/3,f=(1-r)/3,u=(1+r*N(l*n)/N(c-l*n))/3,o=1-(f+u)):(n-=2/3,u=(1-r)/3,o=(1+r*N(l*n)/N(c-l*n))/3,f=1-(u+o)),f=J(t*f*3),u=J(t*u*3),o=J(t*o*3),[255*f,255*u,255*o,e.length>3?e[3]:1]},ln=function(){var n,r,t,e,o,u,f,a;return f=An(arguments),u=f[0],r=f[1],n=f[2],l=2*Math.PI,u/=255,\nr/=255,n/=255,o=Math.min(u,r,n),e=(u+r+n)/3,a=1-o/e,0===a?t=0:(t=(u-r+(u-n))/2,t/=Math.sqrt((u-r)*(u-r)+(u-n)*(r-n)),t=Math.acos(t),n>r&&(t=l-t),t/=l),[360*t,a,e]},k.hsi=function(){return function(n,r,t){t.prototype=n.prototype;var e=new t,o=n.apply(e,r);return Object(o)===o?o:e}(t,En.call(arguments).concat([\"hsi\"]),function(){})},d.hsi=R,t.prototype.hsi=function(){return ln(this._rgb)},Y=function(n,r,t,e){var o,u,f,a,c,i,l,s,p,d,h,b,v;return\"hsl\"===e?(b=n.hsl(),v=r.hsl()):\"hsv\"===e?(b=n.hsv(),v=r.hsv()):\"hcg\"===e?(b=n.hcg(),v=r.hcg()):\"hsi\"===e?(b=n.hsi(),v=r.hsi()):\"lch\"!==e&&\"hcl\"!==e||(e=\"hcl\",b=n.hcl(),v=r.hcl()),\"h\"===e.substr(0,1)&&(f=b[0],d=b[1],i=b[2],a=v[0],h=v[1],l=v[2]),isNaN(f)||isNaN(a)?isNaN(f)?isNaN(a)?u=Number.NaN:(u=a,1!==i&&0!==i||\"hsv\"===e||(p=h)):(u=f,1!==l&&0!==l||\"hsv\"===e||(p=d)):(o=a>f&&a-f>180?a-(f+360):a180?a+360-f:a-f,u=f+t*o),null==p&&(p=d+t*(h-d)),c=i+t*(l-i),s=k[e](u,p,c)},h=h.concat(function(){var n,r,t,e;for(t=[\"hsv\",\"hsl\",\"hsi\",\"hcl\",\"lch\",\"hcg\"],e=[],r=0,n=t.length;r=a?f(r):null,p=r.length;s&&(i=u,l=!1,r=s);n:for(;++ci))return!1;for(;++cOpenStreetMap'\n}).addTo(map)\n\n// Add GeoJSON\n$.getJSON('./crimes_by_district.geojson', function (geojson) {\n L.choropleth(geojson, {\n valueProperty: 'incidents',\n scale: ['white', 'red'],\n steps: 5,\n mode: 'q',\n style: {\n color: '#fff',\n weight: 2,\n fillOpacity: 0.8\n },\n onEachFeature: function (feature, layer) {\n layer.bindPopup('District ' + feature.properties.dist_num + '
' +\n feature.properties.incidents.toLocaleString() + ' incidents')\n }\n }).addTo(map)\n})\n" }, { "path": "examples/basic/index.html", "content": "\n\n\t\n\t\t\n\t\tLeaflet Choropleth\n\t\t\n\t\n\t\n\t\t
\n\t\t\n\t\t\n\t\t\n\t\t\n\t\n\n" }, { "path": "examples/computed_values/demo.js", "content": "var map = L.map('map').setView([39.9897471840457, -75.13893127441406], 11)\n\n// Add basemap\nL.tileLayer('http://{s}.tiles.wmflabs.org/bw-mapnik/{z}/{x}/{y}.png', {\n maxZoom: 18,\n attribution: '© OpenStreetMap'\n}).addTo(map)\n\n// Add GeoJSON\n$.getJSON('../basic/crimes_by_district.geojson', function (geojson) {\n L.choropleth(geojson, {\n valueProperty: function (feature) {\n return feature.properties.incidents / feature.properties.area_sqmi\n },\n scale: ['white', 'red'],\n steps: 5,\n mode: 'q',\n style: {\n color: '#fff',\n weight: 2,\n fillOpacity: 0.8\n },\n onEachFeature: function (feature, layer) {\n layer.bindPopup('District ' + feature.properties.dist_num + '
' +\n feature.properties.incidents.toLocaleString() + ' incidents
' +\n Math.round(feature.properties.area_sqmi).toLocaleString() + ' sq mi')\n }\n }).addTo(map)\n})\n" }, { "path": "examples/computed_values/index.html", "content": "\n\n\t\n\t\t\n\t\tLeaflet Choropleth\n\t\t\n\t\n\t\n\t\t
\n\t\t\n\t\t\n\t\t\n\t\t\n\t\n\n" }, { "path": "examples/fetch_join/demo.js", "content": "/**\n * Advanced demo\n * Fetches a geojson file as well as a data file and joins them before passing to L.choropleth\n */\nvar map = L.map('map').setView([39.9897471840457, -75.13893127441406], 11)\n\n// Add basemap\nL.tileLayer('http://{s}.tiles.wmflabs.org/bw-mapnik/{z}/{x}/{y}.png', {\n maxZoom: 18,\n attribution: '© OpenStreetMap'\n}).addTo(map)\n\n// Fetch GeoJSON and data to join to it\n$.when(\n $.getJSON('https://data.phila.gov/resource/bbgf-pidf.geojson'),\n $.getJSON('https://data.phila.gov/resource/r24g-zx3n.json?%24select=count(*)%20as%20value%2C%20%3A%40computed_region_bbgf_pidf%20as%20label&%24group=%3A%40computed_region_bbgf_pidf&%24order=value%20desc')\n ).done(function (responseGeojson, responseData) {\n var data = responseData[0]\n var geojson = responseGeojson[0]\n\n // Create hash table for easy reference\n var dataHash = data.reduce(function (hash, item) {\n if (item.label) {\n hash[item.label] = isNaN(item.value) ? null : +item.value\n }\n return hash\n }, {})\n\n // Add value from hash table to geojson properties\n geojson.features.forEach(function (item) {\n item.properties.incidents = dataHash[item.properties._feature_id] || null\n })\n\n L.choropleth(geojson, {\n valueProperty: 'incidents',\n scale: ['white', 'red'],\n steps: 5,\n mode: 'q',\n style: {\n color: '#fff',\n weight: 2,\n fillOpacity: 0.8\n },\n onEachFeature: function (feature, layer) {\n layer.bindPopup('District ' + feature.properties.dist_num + '
' + feature.properties.incidents.toLocaleString() + ' incidents')\n }\n }).addTo(map)\n })\n " }, { "path": "examples/fetch_join/index.html", "content": "\n\n\t\n\t\t\n\t\tLeaflet Choropleth\n\t\t\n\t\n\t\n\t\t
\n\t\t\n\t\t\n\t\t\n\t\t\n\t\n\n" }, { "path": "examples/legend/demo.js", "content": "var map = L.map('map').setView([39.9897471840457, -75.13893127441406], 11)\n\n// Add basemap\nL.tileLayer('http://{s}.tiles.wmflabs.org/bw-mapnik/{z}/{x}/{y}.png', {\n maxZoom: 18,\n attribution: '© OpenStreetMap'\n}).addTo(map)\n\n// Add GeoJSON\n$.getJSON('../basic/crimes_by_district.geojson', function (geojson) {\n var choroplethLayer = L.choropleth(geojson, {\n valueProperty: 'incidents',\n scale: ['white', 'red'],\n steps: 5,\n mode: 'q',\n style: {\n color: '#fff',\n weight: 2,\n fillOpacity: 0.8\n },\n onEachFeature: function (feature, layer) {\n layer.bindPopup('District ' + feature.properties.dist_num + '
' + feature.properties.incidents.toLocaleString() + ' incidents')\n }\n }).addTo(map)\n\n // Add legend (don't forget to add the CSS from index.html)\n var legend = L.control({ position: 'bottomright' })\n legend.onAdd = function (map) {\n var div = L.DomUtil.create('div', 'info legend')\n var limits = choroplethLayer.options.limits\n var colors = choroplethLayer.options.colors\n var labels = []\n\n // Add min & max\n div.innerHTML = '
' + limits[0] + '
\\\n\t\t\t
' + limits[limits.length - 1] + '
'\n\n limits.forEach(function (limit, index) {\n labels.push('
  • ')\n })\n\n div.innerHTML += '
      ' + labels.join('') + '
    '\n return div\n }\n legend.addTo(map)\n})\n" }, { "path": "examples/legend/index.html", "content": "\n\n\t\n\t\t\n\t\tLeaflet Choropleth\n\t\t\n\t\t\n\t\n\t\n\t\t
    \n\t\t\n\t\t\n\t\t\n\t\t\n\t\n\n" }, { "path": "package.json", "content": "{\n \"name\": \"leaflet-choropleth\",\n \"version\": \"1.1.4\",\n \"description\": \"Choropleth plugin for Leaflet (color scale based on value)\",\n \"main\": \"src/choropleth.js\",\n \"scripts\": {\n \"build\": \"webpack -p\",\n \"watch\": \"webpack --watch\",\n \"test\": \"standard src | snazzy && mocha test\"\n },\n \"keywords\": [\n \"leaflet\",\n \"choropleth\",\n \"chloropleth\"\n ],\n \"author\": \"timwis \",\n \"homepage\": \"https://github.com/timwis/leaflet-choropleth\",\n \"repository\": {\n \"type\": \"git\",\n \"url\": \"https://github.com/timwis/leaflet-choropleth.git\"\n },\n \"license\": \"MIT\",\n \"devDependencies\": {\n \"jsdom\": \"^7.2.0\",\n \"mocha\": \"^2.3.4\",\n \"mocha-jsdom\": \"^1.0.0\",\n \"should\": \"^8.0.0\",\n \"snazzy\": \"^2.0.1\",\n \"standard\": \"^5.4.1\",\n \"webpack\": \"^2.5.1\"\n },\n \"dependencies\": {\n \"chroma-js\": \"^1.1.1\",\n \"leaflet\": \"^1.0.2\",\n \"lodash\": \"^4.17.4\"\n }\n}\n" }, { "path": "src/choropleth.js", "content": "var L = require('leaflet')\nvar chroma = require('chroma-js')\nvar _ = require('lodash/object')\n\nL.choropleth = module.exports = function (geojson, opts) {\n opts = opts || {}\n\n // Set default options in case any weren't passed\n _.defaults(opts, {\n valueProperty: 'value',\n scale: ['white', 'red'],\n steps: 5,\n mode: 'q'\n })\n\n // Save what the user passed as the style property for later use (since we're overriding it)\n var userStyle = opts.style\n\n // Calculate limits\n var values = geojson.features.map(\n typeof opts.valueProperty === 'function' ?\n opts.valueProperty :\n function (item) {\n return item.properties[opts.valueProperty]\n })\n var limits = chroma.limits(values, opts.mode, opts.steps - 1)\n\n // Create color buckets\n var colors = (opts.colors && opts.colors.length === limits.length ?\n opts.colors :\n chroma.scale(opts.scale).colors(limits.length))\n\n return L.geoJson(geojson, _.extend(opts, {\n limits: limits,\n colors: colors,\n style: function (feature) {\n var style = {}\n var featureValue\n\n if (typeof opts.valueProperty === 'function') {\n featureValue = opts.valueProperty(feature)\n } else {\n featureValue = feature.properties[opts.valueProperty]\n }\n\n if (!isNaN(featureValue)) {\n // Find the bucket/step/limit that this value is less than and give it that color\n for (var i = 0; i < limits.length; i++) {\n if (featureValue <= limits[i]) {\n style.fillColor = colors[i]\n break\n }\n }\n }\n\n // Return this style, but include the user-defined style if it was passed\n switch (typeof userStyle) {\n case 'function':\n return _.defaults(style, userStyle(feature))\n case 'object':\n return _.defaults(style, userStyle)\n default:\n return style\n }\n }\n }))\n}\n" }, { "path": "test/choropleth.test.js", "content": "/* global describe, it, before */\nvar fs = require('fs')\nrequire('should')\nvar jsdom = require('mocha-jsdom')\n\nvar geojson = JSON.parse(fs.readFileSync('./examples/basic/crimes_by_district.geojson'))\n\ndescribe('basic usage', function () {\n jsdom()\n\n before(function () {\n this.choropleth = require('../src/choropleth')\n this.style = {fillColor: 'lime'}\n this.layer = this.choropleth(geojson, {\n style: this.style,\n valueProperty: 'incidents'\n })\n // console.log(require('util').inspect(this.layer.options, {colors: true, depth: 2}))\n })\n\n it('returns a layer', function () {\n this.layer.should.have.property('_layers')\n })\n\n it('sets limits', function () {\n this.layer.options.should.have.property('limits')\n var limits = this.layer.options.limits\n limits.should.have.length(5)\n limits[0].should.be.equal(814)\n limits[4].should.be.equal(45529)\n })\n\n it('sets colors', function () {\n this.layer.options.should.have.property('colors')\n var colors = this.layer.options.colors\n colors.should.have.length(5)\n colors[0].should.be.equal('#ffffff')\n colors[4].should.be.equal('#ff0000')\n })\n\n it('sets the color of a feature', function () {\n var style = this.layer.options.style(geojson.features[0])\n style.should.have.property('fillColor', '#ffbfbf')\n })\n\n it(\"doesn't modify style object\", function () {\n this.style.should.be.eql({fillColor: 'lime'})\n })\n})\n\ndescribe('valueProperty function', function () {\n jsdom()\n\n before(function () {\n this.choropleth = require('../src/choropleth')\n this.layer = this.choropleth(geojson, {\n valueProperty: function (feature) {\n return feature.properties.incidents\n }\n })\n // console.log(require('util').inspect(this.layer.options, {colors: true, depth: 2}))\n })\n\n it('sets limits', function () {\n this.layer.options.should.have.property('limits')\n var limits = this.layer.options.limits\n limits.should.have.length(5)\n limits[0].should.be.equal(814)\n limits[4].should.be.equal(45529)\n })\n\n it('sets the color of a feature', function () {\n var style = this.layer.options.style(geojson.features[0])\n style.should.have.property('fillColor', '#ffbfbf')\n })\n})\n" }, { "path": "webpack.config.js", "content": "module.exports = {\n entry: './src/choropleth.js',\n output: {\n path: __dirname + '/dist',\n filename: 'choropleth.js'\n },\n externals: {\n 'leaflet': 'L'\n }\n}" } ]