d3.jsで複数の折れ線グラフを書く
基本的には他と同様データをバインドして描画するのですが、
複数グラフを書きたいときは引数に配列をとって描画のところをループしてあげるとDRYにかけると思います。
function drawLine(id, datasets) { // コンテナ var margin = {top: 20, right: 20, bottom: 30, left: 40}, width = 600 - (margin.left + margin.right), height = 400 - (margin.top + margin.bottom); var svg = d3.select(id) .attr({ width : width + (margin.left + margin.right), height : height + (margin.top + margin.bottom) }) .append("g") .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); // スケール var xScale = d3.scale.linear() .domain([20, 80]) .range([0, width]); var yScale = d3.scale.linear() .domain([0, 0.45]) .range([height, 0]); // 軸 var xAxis = d3.svg.axis() .scale(xScale) .orient("bottom"); var yAxis = d3.svg.axis() .scale(yScale) .orient("left"); svg.append("g") .attr("class", "x axis") .attr("transform", "translate(0," + height + ")") // ←x軸を下側に移動 .call(xAxis); svg.append("g") .attr("class", "y axis") .call(yAxis); // 描画 var line = d3.svg.line() .x(function(d){ return xScale(d.age); }) .y(function(d){ return yScale(d.rate); }); var colorArr = ['#E74C3C', '#3498DB', '#2ECC71', '#9B59B6', '#34495e', '#449248', '#652681']; for(var i = 0; i < datasets.length; i++) { svg.append("path") .datum(datasets[i]) .attr("class", "line") .attr("d", line) .attr("stroke", colorArr[i]) .attr("stroke-width", "2px") .attr("fill", "none"); } } // データ var Dataset1 = [ {age: 25, rate: 0.06633412364} ,{age: 30, rate: 0.1620942} ,{age: 40, rate: 0.1859880326} ,{age: 50, rate: 0.1567057713} ,{age: 60, rate: 0.1850232472} ,{age: 70, rate: 0.1450872925} ,{age: 80, rate: 0.09876733278} ]; var Dataset2 = [ {age: 25, rate: 0} ,{age: 30, rate: 0.07122905028} ,{age: 40, rate: 0.2346368715} ,{age: 50, rate: 0.3575418994} ,{age: 60, rate: 0.2402234637} ,{age: 70, rate: 0.09497206704} ,{age: 80, rate: 0.001396648045} ]; var Dataset3 = [ {age: 25, rate: 0.007227671657} ,{age: 30, rate: 0.0586990191} ,{age: 40, rate: 0.1338151781} ,{age: 50, rate: 0.2699019102} ,{age: 60, rate: 0.4212183789} ,{age: 70, rate: 0.1064532783} ,{age: 80, rate: 0.002684563758} ]; drawLine("#line", [Dataset1, Dataset1, Dataset3]);