D3 Examples - gun-violence-viz

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
body { font: 12px Arial;}
​
path { 
    stroke: steelblue;
    stroke-width: 2;
    fill: none;
}
​
.axis path,
.axis line {
    fill: none;
    stroke: grey;
    stroke-width: 1;
    shape-rendering: crispEdges;
}
​
.legend {
    font-size: 16px;
    font-weight: bold;
    text-anchor: middle;
}
​
</style>
<body>
​
<!-- load the d3.js library -->    
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
// Set the dimensions of the canvas / graph
var margin = {top: 1, right: 1, bottom: 82, left: 50},
    width = 950 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
// Parse the date / time
var parseDate = d3.time.format("%Y-%m").parse;
​
// Set the ranges
var x = d3.time.scale().range([0, width]);
var y = d3.scale.log().range([height, 0]);
​
// Define the axes
var xAxis = d3.svg.axis().scale(x)
    .orient("bottom").ticks(20);
​
var yAxis = d3.svg.axis().scale(y)
    .orient("left").ticks(5);
​
// Define the line
var drawline = d3.svg.line()    
    .x(function(d) { return x(d.month); })
    .y(function(d) { return y(d.handgun); });
    
// Adds the svg canvas
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 + ")");
​
// Get the data
d3.csv("bgcheckdata.csv", function(error, data) {
    data.forEach(function(d) {
      d.month = parseDate(d.month);
      d.permit = +d.permit;
      d.handgun = +d.handgun;
    });
​
    var dataNestByState = d3.nest()
        .key(function(d) {return d.state;})
        .entries(data);
    console.log(dataNestByState);
        
    // Scale the range of the data
    x.domain(d3.extent(data, function(d) { return d.month; }));
    y.domain([1, d3.max(data, function(d) { return d.handgun; })]);
    
    var color = d3.scale.category10();   // set the colour scale
​
    legendSpace = width/dataNestByState.length; // spacing for the legend
​
    // Loop through each symbol / key
    dataNestByState.forEach(function(d,i) { 
        svg.append("path")
            .attr("class", "line")
            .style("stroke", function() { // Add the colours dynamically
                return d.color = color(d.key); })
            .attr("id", 'tag'+d.key.replace(/\s+/g, '')) // assign ID
            .attr("d", drawline(d.values));
        
        // Add the Legend
        svg.append("text")
            .attr("x", (legendSpace/2)+i*legendSpace)  // space legend
            .attr("y", height + (margin.bottom/2)*(i%9) + 5)
            .attr("class", "legend")    // style the legend
            .style("fill", function() { // Add the colours dynamically
                return d.color = color(d.key); })
            .on("click", function(){
                // Determine if current line is visible 
                var active   = d.active ? false : true,
                newOpacity = active ? 0 : 1; 
                // Hide or show the elements based on the ID
                d3.select("#tag"+d.key.replace(/\s+/g, ''))
                    .transition().duration(100) 
                    .style("opacity", newOpacity); 
                // Update whether or not the elements are active
                d.active = active;
                })  
            .text(d.key);
    });
​
    // Add the X Axis
    svg.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);
​
    // Add the Y Axis
    svg.append("g")
        .attr("class", "y axis")
        .call(yAxis);
​
});
​
​
​
</script>
</body>
    