Old school D3 from simpler times

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leonardobareno

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GeoJSON Bogota

Forked from https://gist.github.com/kristw/7fbf031e3205a8a453a8 by Krist Wongsuphasawat

<!DOCTYPE html>
<meta charset="utf-8">
<style>
@import url(https://fonts.googleapis.com/css?family=Open+Sans+Condensed:300|Josefin+Slab|Arvo|Lato|Vollkorn|Abril+Fatface|Old+Standard+TT|Droid+Sans|Lobster|Inconsolata|Montserrat|Playfair+Display|Karla|Alegreya|Libre+Baskerville|Merriweather|Lora|Archivo+Narrow|Neuton|Signika|Questrial|Fjalla+One|Bitter|Varela+Round);
.background {
  fill: #eee;
  pointer-events: all;
}
.map-layer {
  fill: #fff;
  stroke: #aaa;
}
.effect-layer{
  pointer-events:none;
}
text{
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-weight: 300;
}
text.big-text{
  font-size: 30px;
  font-weight: 400;
}
.effect-layer text, text.dummy-text{
  font-size: 12px;
}
</style>
<body>

<svg></svg>

<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
var width = 960,
    height = 500,
    centered;
// Define color scale
var color = d3.scale.linear()
  .domain([1, 20])
  .clamp(true)
  .range(['#fff', '#409A99']);
var projection = d3.geo.mercator()
  .scale(75000)
  // Customize the projection to make the center of Thailand become the center of the map
  .rotate([74.0712581087617,-4.61742011111319])
  .translate([width / 2, height / 2]);
var path = d3.geo.path()
  .projection(projection);
// Set svg width & height
var svg = d3.select('svg')
  .attr('width', width)
  .attr('height', height);
// Add background
svg.append('rect')
  .attr('class', 'background')
  .attr('width', width)
  .attr('height', height)
  .on('click', clicked);
var g = svg.append('g');
var effectLayer = g.append('g')
  .classed('effect-layer', true);
var mapLayer = g.append('g')
  .classed('map-layer', true);
var dummyText = g.append('text')
  .classed('dummy-text', true)
  .attr('x', 10)
  .attr('y', 30)
  .style('opacity', 0);
var bigText = g.append('text')
  .classed('big-text', true)
  .attr('x', 20)
  .attr('y', 45);
// Load map data
d3.json('bogota.json', function(error, mapData) {
  var features = mapData.features;
  // Update color scale domain based on data
  color.domain([0, d3.max(features, nameLength)]);
  // Draw each province as a path
  mapLayer.selectAll('path')
      .data(features)
    .enter().append('path')
      .attr('d', path)
      .attr('vector-effect', 'non-scaling-stroke')
      .style('fill', fillFn)
      .on('mouseover', mouseover)
      .on('mouseout', mouseout)
      .on('click', clicked);
});
// Get province name
function nameFn(d){
  return d && d.properties ? d.properties.LOC : null;
}
// Get province name length
function nameLength(d){
  var n = nameFn(d);
  return n ? n.length : 0;
}
// Get province color
function fillFn(d){
  return color(nameLength(d));
}
// When clicked, zoom in
function clicked(d) {
  var x, y, k;
  // Compute centroid of the selected path
  if (d && centered !== d) {
    var centroid = path.centroid(d);
    x = centroid[0];
    y = centroid[1];
    k = 4;
    centered = d;
  } else {
    x = width / 2;
    y = height / 2;
    k = 1;
    centered = null;
  }
  // Highlight the clicked province
  mapLayer.selectAll('path')
    .style('fill', function(d){return centered && d===centered ? '#D5708B' : fillFn(d);});
  // Zoom
  g.transition()
    .duration(750)
    .attr('transform', 'translate(' + width / 2 + ',' + height / 2 + ')scale(' + k + ')translate(' + -x + ',' + -y + ')');
}
function mouseover(d){
  // Highlight hovered province
  d3.select(this).style('fill', 'orange');
  // Draw effects
  textArt(nameFn(d));
}
function mouseout(d){
  // Reset province color
  mapLayer.selectAll('path')
    .style('fill', function(d){return centered && d===centered ? '#D5708B' : fillFn(d);});
  // Remove effect text
  effectLayer.selectAll('text').transition()
    .style('opacity', 0)
    .remove();
  // Clear province name
  bigText.text('');
}
// Gimmick
// Just me playing around.
// You won't need this for a regular map.
var BASE_FONT = "'Helvetica Neue', Helvetica, Arial, sans-serif";
var FONTS = [
  "Open Sans",
  "Josefin Slab",
  "Arvo",
  "Lato",
  "Vollkorn",
  "Abril Fatface",
  "Old StandardTT",
  "Droid+Sans",
  "Lobster",
  "Inconsolata",
  "Montserrat",
  "Playfair Display",
  "Karla",
  "Alegreya",
  "Libre Baskerville",
  "Merriweather",
  "Lora",
  "Archivo Narrow",
  "Neuton",
  "Signika",
  "Questrial",
  "Fjalla One",
  "Bitter",
  "Varela Round"
];
function textArt(text){
  // Use random font
  var fontIndex = Math.round(Math.random() * FONTS.length);
  var fontFamily = FONTS[fontIndex] + ', ' + BASE_FONT;
  bigText
    .style('font-family', fontFamily)
    .text(text);
  // Use dummy text to compute actual width of the text
  // getBBox() will return bounding box
  dummyText
    .style('font-family', fontFamily)
    .text(text);
  var bbox = dummyText.node().getBBox();
  var textWidth = bbox.width;
  var textHeight = bbox.height;
  var xGap = 3;
  var yGap = 1;
  // Generate the positions of the text in the background
  var xPtr = 0;
  var yPtr = 0;
  var positions = [];
  var rowCount = 0;
  while(yPtr < height){
    while(xPtr < width){
      var point = {
        text: text,
        index: positions.length,
        x: xPtr,
        y: yPtr
      };
      var dx = point.x - width/2 + textWidth/2;
      var dy = point.y - height/2;
      point.distance = dx*dx + dy*dy;
      positions.push(point);
      xPtr += textWidth + xGap;
    }
    rowCount++;
    xPtr = rowCount%2===0 ? 0 : -textWidth/2;
    xPtr += Math.random() * 10;
    yPtr += textHeight + yGap;
  }
  var selection = effectLayer.selectAll('text')
    .data(positions, function(d){return d.text+'/'+d.index;});
  // Clear old ones
  selection.exit().transition()
    .style('opacity', 0)
    .remove();
  // Create text but set opacity to 0
  selection.enter().append('text')
    .text(function(d){return d.text;})
    .attr('x', function(d){return d.x;})
    .attr('y', function(d){return d.y;})
    .style('font-family', fontFamily)
    .style('fill', '#777')
    .style('opacity', 0);
  selection
    .style('font-family', fontFamily)
    .attr('x', function(d){return d.x;})
    .attr('y', function(d){return d.y;});
  // Create transtion to increase opacity from 0 to 0.1-0.5
  // Add delay based on distance from the center of the <svg> and a bit more randomness.
  selection.transition()
    .delay(function(d){
      return d.distance * 0.01 + Math.random()*1000;
    })
    .style('opacity', function(d){
      return 0.1 + Math.random()*0.4;
    });
}
</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js