gun-violence-viz

This is a variation on the original example that uses a log scale for the Y axis.

forked from trucnguyen's block: gun-violence-viz

<!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>

<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;
    });

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>

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

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