Prop F with SF Precincts

d3 meetup in Oakland

More at: datamap.io

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<!DOCTYPE html>
<meta charset="utf-8">
<head>
  <title>San Francisco Precincts / Prop F</title>
<style>

body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: 'Lato', sans-serif;
    color: #272a2f;
}

#mapcanvas {
  width: 960px;
  height: 600px;
  margin: 10px 10px 10px 10px;
  /*padding: 5px 5px 5px 5px;*/
  border: 0.2px solid #555;

}

.precinct {
  fill: #f6f6f6;
  /*fill: #eee;*/
}

.precinct-boundary {
  fill: none;
  stroke: #fff;
  stroke-width: none;
}

</style>

var width = 960,
    height = 600;

// PROJECTION

// SF_DOE_Precincts_20120702.prj
// You can also center the map on: -122.51494800050519,37.70813100002812 like in the TopoJSON
/*var projection = d3.geo.conicConformal() 
    .rotate([0, 0, 0])  
    .center([-122.433701, 37.767683])
    .scale(235000)
    .parallels([37.06666666666667, 38.43333333333333])
    .translate([width / 2, height / 2])
    .precision(.1);*/

// MERCATOR
var projection = d3.geo.mercator()
    .center([-122.433701, 37.767683])
    .scale(211000)
    .translate([width / 2, 310]);

var path = d3.geo.path()
    .projection(projection);

var svg = d3.select("#mapcanvas").append("svg")
    .attr("width", width)
    .attr("height", height);

// Title inside the Map
svg.append("text")
    .attr("x", "50")             
    .attr("y", "29")
    .attr("text-anchor", "start")  
    .style("font-size", "16px") 
    .style("text-decoration", "none")  
    .text("Prop F, Election Day, November 3, 2015");

var linear = d3.scale.linear()
             .domain([0, 0.5, 1])
             .range(["red", "white", "green"]);

// Linear 2
// Excluding outliers (but please check the data first)
var linear2 = d3.scale.linear()
             .domain([0.25, 0.5, 0.75])
             .range(["red", "white", "green"]);

var threshold = d3.scale.threshold()
             .domain([0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1])
             .range(["#8e0152", "#c51b7d", "#de77ae", "#f1b6da", "#fde0ef", "#f7f7f7", "#e6f5d0", "#b8e186", "#7fbc41", "#4d9221", "#276419"]);

queue()
      .defer(d3.json, 'san_francisco_precinct_20120702.topojson')               
      .defer(d3.csv, 'DATA_prop_f_election_day_yes_percentage_20151103_20151119.csv') // REPLACE REF WITH DATA
      .await(ready);

function ready(error, MAP, DATA) {    // REPLACE REF WITH DATA
  if (error) throw error; 
  console.log(MAP)   // CHECK YOUR MAP
  console.log(DATA)  // CHECK YOUR DATA

var precincts = topojson.feature(MAP, MAP.objects.precinct);

var pctname = {};
  DATA.forEach(function(d) { pctname[d.id] = d.precinct_names})

var nh = {};
  DATA.forEach(function(d) { nh[d.id] = d.neighborhood})

var yesp = {};
  DATA.forEach(function(d) { yesp[d.id] = +d.yes_percentage; });

svg.append("g")
      .attr("class", "precinct")
      .selectAll("path")
      .data(precincts.features)
      .enter()
      .append("path")
      .attr("d", path)
      .style("fill", function(d) { return linear(yesp[d.id]); }) // yes percentage
      .append('svg:title').text(function(d) {        
      // return ("GeoID: " + d.id); });
         return (nh[d.id] + ", " + pctname[d.id] +": " + (yesp[d.id]*100) + "% Yes"); });

//Borders 
  svg.append("path")
      .datum(topojson.mesh(MAP, MAP.objects.precinct, function(a, b) { return a !== b; }))
      .attr("class", "precinct-boundary")
      .attr("d", path);

};

</script>
</body>
</html>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js

https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js

https://d3js.org/queue.v1.min.js