ap-demo/verify_adjacent.html at master · gerrymandr/ap-demo · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
  path {
    stroke: black;
    fill: white;
  }
  path.blank {
    fill: white;
  }
  path.district0 {
    fill: green;
  }

  path.district1 {
    fill: orange;
  }

  path.district2 {
    fill: rgb(200, 60, 200);
  }
</style>

<body>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js"></script>

  <h2>Redistrict Chester County, PA</h2>
This page allows you to assign the voting areas of Chester county to one of
three districts (green, orange and purple).
Then see whether the Democrats or Republicans will win each district.

<p>
Click here to select which district you want to build.  You can also
click in a area that has been assigned and drag your mouse to
assign nearby areas.
</p>
 <p>
  <svg id="paletteSvg" width="500px" height="60px" align="left">
    <g id="palette"></g>
  </svg>
  <br>
  <svg id="scoreSvg" width="500px" height="160px" align="left">
    <g id="score"></g>
    <text x=10, y=160, style="font-family:monospace">Percent Democrat</text>
  </svg>
</p>
  <svg id="mapSvg" width="600px" height="600px">
    <g class="map"></g>
  </svg>

  <script>
    var nDistricts = 3
    // Colors for each user-assigned district
    var districtColors = ["green", "orange", "rgb(200, 60, 200)"]
    var districtPopulation = [0, 0, 0]
    var districtDemocrats = [0, 0, 0]
    var districtRepublicans = [0, 0, 0]
    var maxBias = 0
    var totalPopulation = 0;
    // Desired population for each district
    var targetPopulation = 0;

    // To which district are we currently assigning areas
    var currentDistrictBrush = 0
    // Is the mouse down
    var dragging = false;


    var width = 600,
      height = 600;

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


    var geojson = []

    // Main startup
    d3.json("data_import/Chester.geojson", function (error, x) {
      geojson = x;
      initializePopulation();
      initMap();
      refreshScores();
      refreshPalette();
    });

    function highlightNeighbors(feature) {
	return	d3.selectAll('#mapSvg path').filter(function (d, i) { return feature.properties.adjacent_features.indexOf(i) > -1 }).attr('class', 'district0');
    }

    // Compute total population
    // and therefore desired population
    // per district
    function initializePopulation() {
      for (var i = 0; i < geojson.features.length; i++) {
        var feature = geojson.features[i];
        totalPopulation += feature.properties.VAPERSONS
        var dems = feature.properties.democrats
        var reps = feature.properties.republicans
        if ((dems != null) && (reps != null)) {
            maxBias = Math.max(maxBias, Math.abs(dems - reps))
	}
      }
      targetPopulation = totalPopulation / nDistricts
    }

    // Assign an area to a district
    function assignToDistrict(feature, district) {
      var pop = feature.properties.VAPERSONS
      var dems = feature.properties.democrats
      var reps = feature.properties.republicans
      if (feature.properties.district != null) {
        districtPopulation[feature.properties.district] -= pop
        districtDemocrats[feature.properties.district] -= dems
        districtRepublicans[feature.properties.district] -= reps
      }
      feature.properties.district = district
      districtPopulation[feature.properties.district] += pop
      districtDemocrats[feature.properties.district] += dems
      districtRepublicans[feature.properties.district] += reps
      refreshScores();
    }

    function selectColor(d, i) {
      var district = d.properties.district
      if (district != null) return "";
      else {
        var feature = geojson.features[i]
        var dems = feature.properties.democrats
        var reps = feature.properties.republicans
        if (dems > reps) {
          var hue = 240 //blue
          var saturation = 60
          var lightness = 100 - Math.trunc(25 * (dems - reps) / maxBias)
        } else {
          var hue = 0 //red
          var saturation = 60
          var lightness = 100 - Math.trunc(25 * (reps - dems) / maxBias)
        }
        var color = "hsl(" + hue + "," + saturation + "%," + lightness + "% )"
        return color
      }
    }

    // Refresh D3 binding
    // between features and map areas
    function initMap() {
      var projection = d3.geoAlbers()
        .fitSize([width, height], geojson);

      var geoGenerator = d3.geoPath()
        .projection(projection);

      d3.select("#mapSvg")
	.selectAll('g')
        .data(geojson.features)
        .enter()
        .append('path')
        .attr("id", function (d, i) {
          // give each division an id
          return "division" + i
        })
        .style("stroke", "rgb(177, 176, 176)")
        .style("stroke-width", 1)
        .attr("class", function (d, i) {
          // Get the district that has been assigned by the user
          // Should be a zero-based number
          // or missing for unassigned areas
          var district = d.properties.district
          // Use that to determine the area's style
          if (district != null) return "district" + district;
          else return ""
        })
        .attr('d', geoGenerator)
//        .style("fill", selectColor)
        .on("click", function (e, i) {
	   d3.selectAll('#mapSvg path').attr('class', 'blank')
	   highlightNeighbors(e)
//          assignToDistrict(geojson.features[i], currentDistrictBrush)
//         refreshMap(i);
        })
        .on("mousedown", function (e, i) {
          if (geojson.features[i].properties.district != null) {
            currentDistrictBrush = geojson.features[i].properties.district
            dragging = true;
            refreshPalette();
          }

        })

        .on("mouseup", function (e, i) {
          dragging = false;

        })
        .on("mouseenter", function (e, i) {
          if (dragging) {
            assignToDistrict(geojson.features[i], currentDistrictBrush)
            refreshMap(i);
            refreshPalette();
          }

        }).append("svg:title")
        .text(function (d, i) {
          var feature = geojson.features[i]
          pop = feature.properties.VAPERSONS
          var dems = feature.properties.democrats
          var reps = feature.properties.republicans
          if (reps > dems) return "R +" + (reps - dems)
          else return "D +" + (dems - reps)
        })


    }

    // Refresh D3 binding
    // between features and map areas
    function refreshMap(division) {
      d3.select('#division' + division)
        .attr("class", function (d, i) {
          // Get the district that has been assigned by the user
          // Should be a zero-based number
          // or missing for unassigned areas
          // d.properties.district has already been updated
          var district = d.properties.district
          // Use that to determine the area's color
          if (district != null) return "district" + district;
          else return ""
        })
//        .style("fill", selectColor)
    }

    // Refresh D3 binding between
    // the districts and the palette
    function refreshPalette() {
      d3.select("#paletteSvg")
        .selectAll('circle')
        .data(districtColors)
        .style("stroke", function (d, i) {
          if (i == currentDistrictBrush) return "black";
          else return districtColors[i];
        })
        .enter()
        .append("circle")
        .attr("cx", function (d, i) { return 30 + i * 40 })
        .attr("cy", 30)
        .attr("r", 18)
//        .style("fill", function (d, i) {
 //         return districtColors[i];
  //      })
        .style("stroke-width", 4)
        // Shouldn't have to set this here
        // but it doesn't seem to get initialized properly
        .style("stroke", function (d, i) {
          if (i == currentDistrictBrush) return "black";
          else return districtColors[i];
        })
        .on("click", function (e, i) {
          currentDistrictBrush = i;
          dragging = false;
          refreshPalette()
        })
    }

    // Refresh D3 binding between districts
    // and their scores
    function refreshScores() {
      // Colored border for each fill tank

      d3.select("#scoreSvg")
        .selectAll('.targetpop')
        .data(districtPopulation)
        .enter()
        .append('rect')
        .attr("class", "targetpop")
        .attr("x", function (d, i) { return 10 + 40 * i })
        .attr("y", "5")
        .attr("width", "36")
        .attr("height", "100")
//        .style("fill", "white")
        .style("stroke-width", 3)
        .style("stroke", function (d, i) {
          return districtColors[i];
        })
        .on("click", function (e, i) {
          currentDistrictBrush = i;
          dragging = false;
          refreshPalette()
        })

      d3.select("#scoreSvg")
        .selectAll('.fraction')
        .data(districtPopulation)
        .attr("height", function (d, i) { return 100 * districtPopulation[i] / targetPopulation })
        .attr("y", function (d, i) { return 5 + 100 - (100 * districtPopulation[i] / targetPopulation) })
        .enter()
        .append('rect')
        .attr("class", "fraction")
        .attr("x", function (d, i) { return 10 + 40 * i })
        .attr("width", "36")
//        .style("fill", function (d, i) {
 //         return districtColors[i];
  //      })

      // for each

      var predictedWinners = d3.select("#scoreSvg")
        .selectAll('.predictedWinner')
        .data(districtDemocrats)
       .text(percentageText)
        .enter()
        .append('text')
        .attr("class", "predictedWinner")
        .attr("height", 20)
        .attr("y", 130)
        .attr("x", function (d, i) { return 10 + 40 * i })
        .attr("width", "36")
        .style("font-family", "monospace")
        .text(percentageText)

    }

    function percentageText(d, i) {
      var dems = districtDemocrats[i];
      var reps = districtRepublicans[i];
      if (dems) {
        if (dems > reps) return "" + Math.round(100 * dems / (dems + reps)) + "%"
        else return "" + Math.round(100 * dems / (dems + reps)) + "%"
      } else {
        return "  --"
      }
    }

  </script>