D3 Examples - PC v4

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
svg {
  font: 10px sans-serif;
}
​
.background path {
  fill: none;
  stroke: #ddd;
  shape-rendering: crispEdges;
  stroke-opacity: 0.3;
}
​
.foreground path {
  fill: none;
  stroke: #f4a641;
}
​
.brush .extent {
  fill-opacity: .3;
  stroke: #fff;
  shape-rendering: crispEdges;
}
​
.axis line,
.axis path {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.axis text {
  fill:black;
  font-size: 12px;
  cursor: move;
}
​
</style>
<body>
<script src="//d3js.org/d3.v4.min.js"></script>
<script>
​
var margin = {top: 30, right: 10, bottom: 10, left: 10},
    width = 1000 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
  
  
function createPC(data){  
var x = d3.scaleBand().rangeRound([0,width]).padding(1),
    y = {},
    dragging = {};
​
var line = d3.line(),
    extents,
    background,
    foreground;
​
  
var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
​
​
  // Extract the list of dimensions and create a scale for each.  
  x.domain(dimensions = d3.keys(data[0]).filter(function(d){
        if (d == 'college' || d == 'pov' || d == 'urate' || d == 'county_income'){
                            return (y[d] = d3.scaleLinear()
                            .domain(d3.extent(data, function(p) { return +p[d]; }))
                            .range([height, 15]));
                }
              }));
​
 extents = dimensions.map(function(p) { return [0,0]; });
  // Add grey background lines for context.
  background = svg.append("g")
      .attr("class", "background")
    .selectAll("path")
      .data(data)
    .enter().append("path")
      .attr("d", path);
​
  // Add blue foreground lines for focus.
  foreground = svg.append("g")
      .attr("class", "foreground")
    .selectAll("path")
      .data(data)
    .enter().append("path")
      .attr("d", path);
  
//console.log(dimensions);  
  
  // Add a group element for each dimension.
  var g = svg.selectAll(".dimension")
      .data(dimensions)
    .enter().append("g")
      .attr("class", "dimension")
      .attr("transform", function(d) { return "translate(" + x(d) + ")"; })
​
    //console.log(dimensions);
  // Add an axis and title.
  
    g.append("g")
      .attr("class", "axis")
      .each(function(d) { d3.select(this).call(d3.axisLeft(y[d])); })
    .append("text")
      .style("text-anchor", "middle")
      .attr("y", -9)
      .text(function(d) { return d; })
        .style("font-size","20px")
        .attr("transform"," translate(0,0)");
​
​
  // Add and store a brush for each axis.
    g.append("g")
      .attr("class", "brush")
      .each(function(d) {
        d3.select(this)
          .call(y[d].brush = d3.brushY()
                .extent([[-8, 0], [8,height]])
                .on("brush start", brushstart)
                .on("brush", brush_parallel_chart));
      })
    .selectAll("rect")
      .attr("x", -8)
      .attr("width", 16);
​
​
function position(d) {
  var v = dragging[d];
  return v == null ? x(d) : v;
}
​
function transition(g) {
  return g.transition().duration(500);
}
​
// Returns the path for a given data point.
function path(d) {
  return line(dimensions.map(function(p) { return [position(p), y[p](d[p])]; }));
}
  
function brushstart() {
  d3.event.sourceEvent.stopPropagation();
}
​
function brush_parallel_chart() {    
    for(var i=0;i<dimensions.length;++i){
        if(d3.event.target==y[dimensions[i]].brush) {
            extents[i]=d3.event.selection.map(y[dimensions[i]].invert,y[dimensions[i]]);
​
        }
    }
​
      foreground.style("display", function(d) {
        return dimensions.every(function(p, i) {
            if(extents[i][0]==0 && extents[i][0]==0) {
                return true;
            }
          return extents[i][1] <= d[p] && d[p] <= extents[i][0];
        }) ? null : "none";
      });
}
};
 
  
  d3.csv("police_killings.csv", function(error, data) {
        createPC(data)
  });
​
</script>
​
    