LuisSevillano · October 25, 2016 14:11
diff --git a/README.md b/README.md
diff --git a/d3.v4.min.js b/d3.v4.min.js
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diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, user-scalable=no">
 <style >
 body {
  font-size: 62.5%;
 }
 #map {
  width: 100%;
  max-width: 1600px;
 }
 .states {
  fill: rgba(245,245,245,1);
  stroke: rgba(80,80,80,1);
  stroke-linejoin: round;
 }
 .state:hover {
  fill: rgba(230,230,230,1);
 }
 .label {
  font-size: 1rem;
  fill: rgba(60,60,60,1);
  stroke:none;
  font-family: monospace;
 }

 </style>
 <body>
  <div id="map"></div>
  <script src="d3.v4.min.js"></script>
  <script src="topojson.v1.min.js"></script>
  <script src="polylabel.js"></script>
  <script>

  var width, height, map, container = d3.select("#map");

  d3.json("us.json", function(map){

    renderMap();

    function renderMap(){

      var containerWidth = container.node().getBoundingClientRect().width;
      width = Math.min(containerWidth, 1600),
      height = width * 0.62,

      projection = d3.geoAlbersUsa()
      .scale(1100)

      var path = d3.geoPath()
      .projection(projection)

      var svg = container.append("svg")
      .attr("width", width)
      .attr("height", height)

      var statesG = svg.append("g")
      .attr("class", "states")

      var states = statesG.selectAll(".state")
      .data(topojson.feature(map, map.objects.states).features)
      .enter()
      .append("path")
      .attr("d", path)
      .attr("class", function(d){
        return "state "+d.properties.name
      })
      .attr('stroke-width', '0.5')

      var labelsG = svg.append("g").attr('class', 'labels')

      var labels = labelsG.selectAll(".label")
      .data(topojson.feature(map, map.objects.states).features)
      .enter()
      .append("text")
      .attr('class', 'label')
      .text(function(d){
        //console.log(d.properties.ab,d.properties.name);
        return d.properties.ab
      })
      .attr('transform', function(d){
        // get the larget sub-polygon's coordinates
        var coord = d.geometry.coordinates;
        if (d.geometry.type == 'MultiPolygon') {
          var u = d3.scan(
            coord.map(function(p){
              return -d3.polygonArea(p[0])
            })
          );
          coord = coord[u]
        }
        var n = polylabel([coord[0].map(projection)])
        return "translate(" + n + ")"
      })
    }
  })
  </script>

 </body>
 </html>
diff --git a/polylabel.js b/polylabel.js
 (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.polylabel = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
 'use strict';

 var Queue = require('tinyqueue');

 module.exports = polylabel;

 function polylabel(polygon, precision, debug) {
    precision = precision || 1.0;

    // find the bounding box of the outer ring
    var minX, minY, maxX, maxY;
    for (var i = 0; i < polygon[0].length; i++) {
        var p = polygon[0][i];
        if (!i || p[0] < minX) minX = p[0];
        if (!i || p[1] < minY) minY = p[1];
        if (!i || p[0] > maxX) maxX = p[0];
        if (!i || p[1] > maxY) maxY = p[1];
    }

    var width = maxX - minX;
    var height = maxY - minY;
    var cellSize = Math.min(width, height);
    var h = cellSize / 2;

    // a priority queue of cells in order of their "potential" (max distance to polygon)
    var cellQueue = new Queue(null, compareMax);

    // cover polygon with initial cells
    for (var x = minX; x < maxX; x += cellSize) {
        for (var y = minY; y < maxY; y += cellSize) {
            cellQueue.push(new Cell(x + h, y + h, h, polygon));
        }
    }

    // take centroid as the first best guess
    var bestCell = getCentroidCell(polygon);
    var numProbes = cellQueue.length;

    while (cellQueue.length) {
        // pick the most promising cell from the queue
        var cell = cellQueue.pop();

        // update the best cell if we found a better one
        if (cell.d > bestCell.d) {
            bestCell = cell;
            if (debug) console.log('found best %d after %d probes', Math.round(1e4 * cell.d) / 1e4, numProbes);
        }

        // do not drill down further if there's no chance of a better solution
        if (cell.max - bestCell.d <= precision) continue;

        // split the cell into four cells
        h = cell.h / 2;
        cellQueue.push(new Cell(cell.x - h, cell.y - h, h, polygon));
        cellQueue.push(new Cell(cell.x + h, cell.y - h, h, polygon));
        cellQueue.push(new Cell(cell.x - h, cell.y + h, h, polygon));
        cellQueue.push(new Cell(cell.x + h, cell.y + h, h, polygon));
        numProbes += 4;
    }

    if (debug) {
        console.log('num probes: ' + numProbes);
        console.log('best distance: ' + bestCell.d);
    }

    return [bestCell.x, bestCell.y];
 }

 function compareMax(a, b) {
    return b.max - a.max;
 }

 function Cell(x, y, h, polygon) {
    this.x = x; // cell center x
    this.y = y; // cell center y
    this.h = h; // half the cell size
    this.d = pointToPolygonDist(x, y, polygon); // distance from cell center to polygon
    this.max = this.d + this.h * Math.SQRT2; // max distance to polygon within a cell
 }

 // signed distance from point to polygon outline (negative if point is outside)
 function pointToPolygonDist(x, y, polygon) {
    var inside = false;
    var minDistSq = Infinity;

    for (var k = 0; k < polygon.length; k++) {
        var ring = polygon[k];

        for (var i = 0, len = ring.length, j = len - 1; i < len; j = i++) {
            var a = ring[i];
            var b = ring[j];

            if ((a[1] > y !== b[1] > y) &&
                (x < (b[0] - a[0]) * (y - a[1]) / (b[1] - a[1]) + a[0])) inside = !inside;

            minDistSq = Math.min(minDistSq, getSegDistSq(x, y, a, b));
        }
    }

    return (inside ? 1 : -1) * Math.sqrt(minDistSq);
 }

 // get polygon centroid
 function getCentroidCell(polygon) {
    var area = 0;
    var x = 0;
    var y = 0;
    var points = polygon[0];

    for (var i = 0, len = points.length, j = len - 1; i < len; j = i++) {
        var a = points[i];
        var b = points[j];
        var f = a[0] * b[1] - b[0] * a[1];
        x += (a[0] + b[0]) * f;
        y += (a[1] + b[1]) * f;
        area += f * 3;
    }
    return new Cell(x / area, y / area, 0, polygon);
 }

 // get squared distance from a point to a segment
 function getSegDistSq(px, py, a, b) {

    var x = a[0];
    var y = a[1];
    var dx = b[0] - x;
    var dy = b[1] - y;

    if (dx !== 0 || dy !== 0) {

        var t = ((px - x) * dx + (py - y) * dy) / (dx * dx + dy * dy);

        if (t > 1) {
            x = b[0];
            y = b[1];

        } else if (t > 0) {
            x += dx * t;
            y += dy * t;
        }
    }

    dx = px - x;
    dy = py - y;

    return dx * dx + dy * dy;
 }

 },{"tinyqueue":2}],2:[function(require,module,exports){
 'use strict';

 module.exports = TinyQueue;

 function TinyQueue(data, compare) {
    if (!(this instanceof TinyQueue)) return new TinyQueue(data, compare);

    this.data = data || [];
    this.length = this.data.length;
    this.compare = compare || defaultCompare;

    if (data) for (var i = Math.floor(this.length / 2); i >= 0; i--) this._down(i);
 }

 function defaultCompare(a, b) {
    return a < b ? -1 : a > b ? 1 : 0;
 }

 TinyQueue.prototype = {

    push: function (item) {
        this.data.push(item);
        this.length++;
        this._up(this.length - 1);
    },

    pop: function () {
        var top = this.data[0];
        this.data[0] = this.data[this.length - 1];
        this.length--;
        this.data.pop();
        this._down(0);
        return top;
    },

    peek: function () {
        return this.data[0];
    },

    _up: function (pos) {
        var data = this.data,
            compare = this.compare;

        while (pos > 0) {
            var parent = Math.floor((pos - 1) / 2);
            if (compare(data[pos], data[parent]) < 0) {
                swap(data, parent, pos);
                pos = parent;

            } else break;
        }
    },

    _down: function (pos) {
        var data = this.data,
            compare = this.compare,
            len = this.length;

        while (true) {
            var left = 2 * pos + 1,
                right = left + 1,
                min = pos;

            if (left < len && compare(data[left], data[min]) < 0) min = left;
            if (right < len && compare(data[right], data[min]) < 0) min = right;

            if (min === pos) return;

            swap(data, min, pos);
            pos = min;
        }
    }
 };

 function swap(data, i, j) {
    var tmp = data[i];
    data[i] = data[j];
    data[j] = tmp;
 }

 },{}]},{},[1])(1)
 });
diff --git a/thumbnail.png b/thumbnail.png
diff --git a/topojson.v1.min.js b/topojson.v1.min.js
 !function(n,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t(n.topojson=n.topojson||{})}(this,function(n){"use strict";function t(){}function r(n){if(!n)return t;var r,e,o=n.scale[0],i=n.scale[1],u=n.translate[0],f=n.translate[1];return function(n,t){t||(r=e=0),n[0]=(r+=n[0])*o+u,n[1]=(e+=n[1])*i+f}}function e(n){if(!n)return t;var r,e,o=n.scale[0],i=n.scale[1],u=n.translate[0],f=n.translate[1];return function(n,t){t||(r=e=0);var c=Math.round((n[0]-u)/o),a=Math.round((n[1]-f)/i);n[0]=c-r,n[1]=a-e,r=c,e=a}}function o(n,t){for(var r,e=n.length,o=e-t;o<--e;)r=n[o],n[o++]=n[e],n[e]=r}function i(n,t){for(var r=0,e=n.length;e>r;){var o=r+e>>>1;n[o]<t?r=o+1:e=o}return r}function u(n,t){return"GeometryCollection"===t.type?{type:"FeatureCollection",features:t.geometries.map(function(t){return f(n,t)})}:f(n,t)}function f(n,t){var r={type:"Feature",id:t.id,properties:t.properties||{},geometry:c(n,t)};return null==t.id&&delete r.id,r}function c(n,t){function e(n,t){t.length&&t.pop();for(var r,e=l[0>n?~n:n],i=0,u=e.length;u>i;++i)t.push(r=e[i].slice()),s(r,i);0>n&&o(t,u)}function i(n){return n=n.slice(),s(n,0),n}function u(n){for(var t=[],r=0,o=n.length;o>r;++r)e(n[r],t);return t.length<2&&t.push(t[0].slice()),t}function f(n){for(var t=u(n);t.length<4;)t.push(t[0].slice());return t}function c(n){return n.map(f)}function a(n){var t=n.type;return"GeometryCollection"===t?{type:t,geometries:n.geometries.map(a)}:t in h?{type:t,coordinates:h[t](n)}:null}var s=r(n.transform),l=n.arcs,h={Point:function(n){return i(n.coordinates)},MultiPoint:function(n){return n.coordinates.map(i)},LineString:function(n){return u(n.arcs)},MultiLineString:function(n){return n.arcs.map(u)},Polygon:function(n){return c(n.arcs)},MultiPolygon:function(n){return n.arcs.map(c)}};return a(t)}function a(n,t){function r(t){var r,e=n.arcs[0>t?~t:t],o=e[0];return 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t=0>n?~n:n;(s[t]||(s[t]=[])).push({i:n,g:c})}function o(n){n.forEach(e)}function i(n){n.forEach(o)}function u(n){"GeometryCollection"===n.type?n.geometries.forEach(u):n.type in l&&(c=n,l[n.type](n.arcs))}var f=[];if(arguments.length>1){var c,s=[],l={LineString:o,MultiLineString:i,Polygon:i,MultiPolygon:function(n){n.forEach(i)}};u(t),s.forEach(arguments.length<3?function(n){f.push(n[0].i)}:function(n){r(n[0].g,n[n.length-1].g)&&f.push(n[0].i)})}else for(var h=0,p=n.arcs.length;p>h;++h)f.push(h);return{type:"MultiLineString",arcs:a(n,f)}}function h(n){var t=n[0],r=n[1],e=n[2];return Math.abs((t[0]-e[0])*(r[1]-t[1])-(t[0]-r[0])*(e[1]-t[1]))}function p(n){for(var t,r=-1,e=n.length,o=n[e-1],i=0;++r<e;)t=o,o=n[r],i+=t[0]*o[1]-t[1]*o[0];return i/2}function v(n){return c(n,g.apply(this,arguments))}function g(n,t){function r(n){n.forEach(function(t){t.forEach(function(t){(o[t=0>t?~t:t]||(o[t]=[])).push(n)})}),i.push(n)}function e(t){return 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diff --git a/us.json b/us.json
	<!DOCTYPE html>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, user-scalable=no">
	<style >
	body {
	font-size: 62.5%;
	}
	#map {
	width: 100%;
	max-width: 1600px;
	}
	.states {
	fill: rgba(245,245,245,1);
	stroke: rgba(80,80,80,1);
	stroke-linejoin: round;
	}
	.state:hover {
	fill: rgba(230,230,230,1);
	}
	.label {
	font-size: 1rem;
	fill: rgba(60,60,60,1);
	stroke:none;
	font-family: monospace;
	}

	</style>
	<body>
	<div id="map"></div>
	<script src="d3.v4.min.js"></script>
	<script src="topojson.v1.min.js"></script>
	<script src="polylabel.js"></script>
	<script>

	var width, height, map, container = d3.select("#map");

	d3.json("us.json", function(map){

	renderMap();

	function renderMap(){

	var containerWidth = container.node().getBoundingClientRect().width;
	width = Math.min(containerWidth, 1600),
	height = width * 0.62,

	projection = d3.geoAlbersUsa()
	.scale(1100)

	var path = d3.geoPath()
	.projection(projection)

	var svg = container.append("svg")
	.attr("width", width)
	.attr("height", height)

	var statesG = svg.append("g")
	.attr("class", "states")

	var states = statesG.selectAll(".state")
	.data(topojson.feature(map, map.objects.states).features)
	.enter()
	.append("path")
	.attr("d", path)
	.attr("class", function(d){
	return "state "+d.properties.name
	})
	.attr('stroke-width', '0.5')

	var labelsG = svg.append("g").attr('class', 'labels')

	var labels = labelsG.selectAll(".label")
	.data(topojson.feature(map, map.objects.states).features)
	.enter()
	.append("text")
	.attr('class', 'label')
	.text(function(d){
	//console.log(d.properties.ab,d.properties.name);
	return d.properties.ab
	})
	.attr('transform', function(d){
	// get the larget sub-polygon's coordinates
	var coord = d.geometry.coordinates;
	if (d.geometry.type == 'MultiPolygon') {
	var u = d3.scan(
	coord.map(function(p){
	return -d3.polygonArea(p[0])
	})
	);
	coord = coord[u]
	}
	var n = polylabel([coord[0].map(projection)])
	return "translate(" + n + ")"
	})
	}
	})
	</script>

	</body>
	</html>
	(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.polylabel = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
	'use strict';

	var Queue = require('tinyqueue');

	module.exports = polylabel;

	function polylabel(polygon, precision, debug) {
	precision = precision \|\| 1.0;

	// find the bounding box of the outer ring
	var minX, minY, maxX, maxY;
	for (var i = 0; i < polygon[0].length; i++) {
	var p = polygon[0][i];
	if (!i \|\| p[0] < minX) minX = p[0];
	if (!i \|\| p[1] < minY) minY = p[1];
	if (!i \|\| p[0] > maxX) maxX = p[0];
	if (!i \|\| p[1] > maxY) maxY = p[1];
	}

	var width = maxX - minX;
	var height = maxY - minY;
	var cellSize = Math.min(width, height);
	var h = cellSize / 2;

	// a priority queue of cells in order of their "potential" (max distance to polygon)
	var cellQueue = new Queue(null, compareMax);

	// cover polygon with initial cells
	for (var x = minX; x < maxX; x += cellSize) {
	for (var y = minY; y < maxY; y += cellSize) {
	cellQueue.push(new Cell(x + h, y + h, h, polygon));
	}
	}

	// take centroid as the first best guess
	var bestCell = getCentroidCell(polygon);
	var numProbes = cellQueue.length;

	while (cellQueue.length) {
	// pick the most promising cell from the queue
	var cell = cellQueue.pop();

	// update the best cell if we found a better one
	if (cell.d > bestCell.d) {
	bestCell = cell;
	if (debug) console.log('found best %d after %d probes', Math.round(1e4 * cell.d) / 1e4, numProbes);
	}

	// do not drill down further if there's no chance of a better solution
	if (cell.max - bestCell.d <= precision) continue;

	// split the cell into four cells
	h = cell.h / 2;
	cellQueue.push(new Cell(cell.x - h, cell.y - h, h, polygon));
	cellQueue.push(new Cell(cell.x + h, cell.y - h, h, polygon));
	cellQueue.push(new Cell(cell.x - h, cell.y + h, h, polygon));
	cellQueue.push(new Cell(cell.x + h, cell.y + h, h, polygon));
	numProbes += 4;
	}

	if (debug) {
	console.log('num probes: ' + numProbes);
	console.log('best distance: ' + bestCell.d);
	}

	return [bestCell.x, bestCell.y];
	}

	function compareMax(a, b) {
	return b.max - a.max;
	}

	function Cell(x, y, h, polygon) {
	this.x = x; // cell center x
	this.y = y; // cell center y
	this.h = h; // half the cell size
	this.d = pointToPolygonDist(x, y, polygon); // distance from cell center to polygon
	this.max = this.d + this.h * Math.SQRT2; // max distance to polygon within a cell
	}

	// signed distance from point to polygon outline (negative if point is outside)
	function pointToPolygonDist(x, y, polygon) {
	var inside = false;
	var minDistSq = Infinity;

	for (var k = 0; k < polygon.length; k++) {
	var ring = polygon[k];

	for (var i = 0, len = ring.length, j = len - 1; i < len; j = i++) {
	var a = ring[i];
	var b = ring[j];

	if ((a[1] > y !== b[1] > y) &&
	(x < (b[0] - a[0]) * (y - a[1]) / (b[1] - a[1]) + a[0])) inside = !inside;

	minDistSq = Math.min(minDistSq, getSegDistSq(x, y, a, b));
	}
	}

	return (inside ? 1 : -1) * Math.sqrt(minDistSq);
	}

	// get polygon centroid
	function getCentroidCell(polygon) {
	var area = 0;
	var x = 0;
	var y = 0;
	var points = polygon[0];

	for (var i = 0, len = points.length, j = len - 1; i < len; j = i++) {
	var a = points[i];
	var b = points[j];
	var f = a[0] * b[1] - b[0] * a[1];
	x += (a[0] + b[0]) * f;
	y += (a[1] + b[1]) * f;
	area += f * 3;
	}
	return new Cell(x / area, y / area, 0, polygon);
	}

	// get squared distance from a point to a segment
	function getSegDistSq(px, py, a, b) {

	var x = a[0];
	var y = a[1];
	var dx = b[0] - x;
	var dy = b[1] - y;

	if (dx !== 0 \|\| dy !== 0) {

	var t = ((px - x) * dx + (py - y) * dy) / (dx * dx + dy * dy);

	if (t > 1) {
	x = b[0];
	y = b[1];

	} else if (t > 0) {
	x += dx * t;
	y += dy * t;
	}
	}

	dx = px - x;
	dy = py - y;

	return dx * dx + dy * dy;
	}

	},{"tinyqueue":2}],2:[function(require,module,exports){
	'use strict';

	module.exports = TinyQueue;

	function TinyQueue(data, compare) {
	if (!(this instanceof TinyQueue)) return new TinyQueue(data, compare);

	this.data = data \|\| [];
	this.length = this.data.length;
	this.compare = compare \|\| defaultCompare;

	if (data) for (var i = Math.floor(this.length / 2); i >= 0; i--) this._down(i);
	}

	function defaultCompare(a, b) {
	return a < b ? -1 : a > b ? 1 : 0;
	}

	TinyQueue.prototype = {

	push: function (item) {
	this.data.push(item);
	this.length++;
	this._up(this.length - 1);
	},

	pop: function () {
	var top = this.data[0];
	this.data[0] = this.data[this.length - 1];
	this.length--;
	this.data.pop();
	this._down(0);
	return top;
	},

	peek: function () {
	return this.data[0];
	},

	_up: function (pos) {
	var data = this.data,
	compare = this.compare;

	while (pos > 0) {
	var parent = Math.floor((pos - 1) / 2);
	if (compare(data[pos], data[parent]) < 0) {
	swap(data, parent, pos);
	pos = parent;

	} else break;
	}
	},

	_down: function (pos) {
	var data = this.data,
	compare = this.compare,
	len = this.length;

	while (true) {
	var left = 2 * pos + 1,
	right = left + 1,
	min = pos;

	if (left < len && compare(data[left], data[min]) < 0) min = left;
	if (right < len && compare(data[right], data[min]) < 0) min = right;

	if (min === pos) return;

	swap(data, min, pos);
	pos = min;
	}
	}
	};

	function swap(data, i, j) {
	var tmp = data[i];
	data[i] = data[j];
	data[j] = tmp;
	}

	},{}]},{},[1])(1)
	});