1 require("../../test/env");

     2 require("../../d3");

     3 require("../../d3.geo");

     4 

     5 var fs = require("fs"),

     6     util = require("util"),

     7     Canvas = require("canvas");

     8 

     9 var w = 1920,

    10     h = 1080;

    11 

    12 var projection = d3.geo.albersUsa()

    13     .scale(2000)

    14     .translate([w / 2, h / 2]);

    15 

    16 var path = d3.geo.path()

    17     .projection(projection);

    18 

    19 var canvas = new Canvas(w, h),

    20     context = canvas.getContext("2d");

    21 

    22 context.antialias = "none";

    23 context.lineWidth = 8;

    24 context.lineJoin = "round";

    25 

    26 d3.json(__dirname + "/../data/us-counties.json", function(collection) {

    27   renderAll("stroke");

    28   renderAll("fill");

    29   fs.writeFile("us-counties.png", canvas.toBuffer());

    30 

    31   function renderAll(action) {

    32     collection.features.forEach(function(feature) {

    33       var re = /[MLZ]/g,

    34           d = path(feature),

    35           i = 0,

    36           m;

    37 

    38       context[action + "Style"] = "#" + pad((+feature.id).toString(16));

    39       context.beginPath();

    40       re.lastIndex = 1;

    41       while (m = re.exec(d)) render(m.index);

    42       render();

    43       context[action]();

    44 

    45       function render(j) {

    46         switch (d.charAt(i)) {

    47           case "M": {

    48             var p = d.substring(i + 1, j).split(",").map(Number);

    49             context.moveTo(p[0], p[1]);

    50             break;

    51           }

    52           case "L": {

    53             var p = d.substring(i + 1, j).split(",").map(Number);

    54             context.lineTo(p[0], p[1]);

    55             break;

    56           }

    57           case "Z": {

    58             context.closePath();

    59             break;

    60           }

    61         }

    62         i = j;

    63       }

    64     });

    65   }

    66 });

    67 

    68 function pad(s) {

    69   return s.length < 6 ? new Array(7 - s.length).join("0") + s : s;

    70 }