D3 Examples - Multi-line drug sentences graph

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Drug prison sentences in Spokane County</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.min.js"></script>
        <link rel="stylesheet" type="text/css" href="style.css">
            
        
    
    </head>
    
    
    <body>
    <h2>Drug use and prison, Spokane County</h2>
    <p>The number of people sent to <span style="color:black">prison</span> and <span style="color:slategrey">jail</span> in Spokane County for drug-related crimes versus <span style="color:darkblue">prison</span> and <span style="color:cornflowerblue">jail</span> for all crimes.</p>
    <script type="text/javascript">     
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            var w = 500;
            var h = 300;
            var padding = [10, 10, 20, 50];
            
            var dateFormat = d3.time.format("%Y");
            
            var xScale = d3.time.scale()
                        .range([padding[3], w - padding [1] - padding [3] ]);
            
            var yScale = d3.scale.linear()
                        .range([padding[0], h-padding[2]]);
            
            var Xaxis = d3.svg.axis()
                            .scale(xScale)
                            .orient("bottom")
                            //orientation is about label position, not axis position
                            .ticks(5)
                            .tickFormat(function (d) {
                                return dateFormat(d);
                            
                            });
                            
            var Yaxis = d3.svg.axis()
                            .scale(yScale)
                            .orient ("left");
                            
            var line1 = d3.svg.line()
                        .x(function(d) {
                            return xScale(dateFormat.parse(d.year));
                        })
                        .y(function(d) {
                            return yScale(d.drug_prison);
                        
                        });
            
            var line2 = d3.svg.line()
                        .x(function(d) {
                            return xScale(dateFormat.parse(d.year));
                        })
                        .y(function(d) {
                            return yScale(d.drug_jail);
                        
                        });
            
            var line3 = d3.svg.line()
                        .x(function(d) {
                            return xScale(dateFormat.parse(d.year));
                        })
                        .y(function(d) {
                            return yScale(d.all_prison);
                        
                        });
                        
            var line4 = d3.svg.line()
                        .x(function(d) {
                            return xScale(dateFormat.parse(d.year));
                        })
                        .y(function(d) {
                            return yScale(d.all_jail);
                        
                        });
            
            var svg = d3.select("body").append("svg").attr("width", w).attr("height",h);
            
        
            
            d3.csv("Spokane_drug_sentences.csv", function(data) {
​
                xScale.domain([
                d3.min(data, function(d) {
                    return dateFormat.parse(d.year);
                    }),
                d3.max(data, function(d) {
                    return dateFormat.parse(d.year);
                    })
                ]);
                
                yScale.domain( [d3.max(data, function(d) {
                    return Math.max(+d.drug_prison, +d.drug_jail, +d.all_prison, +d.all_jail);
                }), 0]);
                
                    
                svg.data([ data ])
                    .append("path")
                    .attr("class", "line dprison")
                    .attr("d", line1)
                    .attr("fill", "none")
                    .attr("stroke", "black")
                    .attr("stroke-width", 2);
                
                svg.data([ data ])
                    .append("path")
                    .attr("class", "line djail")
                    .attr("d", line2)
                    .attr("fill", "none")
                    .attr("stroke", "slategrey")
                    .attr("stroke-width", 2);
                
                svg.data([ data ])
                    .append("path")
                    .attr("class", "line aprison")
                    .attr("d", line3)
                    .attr("fill", "none")
                    .attr("stroke", "darkblue")
                    .attr("stroke-width", 2);
                
                svg.data([ data ])
                    .append("path")
                    .attr("class", "line ajail")
                    .attr("d", line4)
                    .attr("fill", "none")
                    .attr("stroke", "cornflowerblue")
                    .attr("stroke-width", 2);
                
                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(0," + (h - padding[2]) + ")")
                    //this positions axis visually, would be at 0,0 otherwise
                    .call(Xaxis);
                
                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + (padding[3] - 10) + ",0)")
                    //this positions axis visually, would be at 0,0 otherwise. translation is relative to the graph itself, I think, not the svg, because a 0 value still gets you some top padding
                    .call(Yaxis);
                    
                });
            
    
​
        
​
        </script>
    <p id="footer">Data from the <a href="https://wa-state-ofm.us/CrimeStatsOnline/">Washington Statistical Analysis Center</a></p>
    </body>
​
    
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