【JavaScript】D3.js ～ 縦棒グラフを作成する ～

Webグラフ / 地図作成ツール

サンプル

* 軸あり、アニメーション、なんちゃってツールチップ 
<!DOCTYPE html>
<meta charset="utf-8">
<style>

.bar:hover {
  fill: steelblue;
}

.axis {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.tooltip {
	border: 1px solid #eee;
	background-color: #fff;
	padding: 8px 8px 0 8px;
	border-radius: 3px;
}


</style>
<body>
<script src="">https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js">
<script>

var dataset = [
  {graphId: "001", yVal: 15, graphColor: "aliceblue"},
  {graphId: "002", yVal: 3, graphColor: "lavender"},
  {graphId: "003", yVal: 22, graphColor: "lightsteelblue"},
  {graphId: "004", yVal: 9, graphColor: "lightslategray"},
  {graphId: "005", yVal: 19, graphColor: "slategray"},
  {graphId: "006", yVal: 15, graphColor: "steelblue"},
  {graphId: "007", yVal: 3, graphColor: "royalblue"},
  {graphId: "008", yVal: 22, graphColor: "midnightblue"},
  {graphId: "009", yVal: 9, graphColor: "navy"},
  {graphId: "010", yVal: 19, graphColor: "darkblue"},
];

var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1);

var y = d3.scale.linear()
    .range([height, 0]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .ticks(10, "");

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 + ")");


x.domain(dataset.map(function(d) { return d.graphId; }));
y.domain([0, d3.max(dataset, function(d) { return d.yVal; })]);

svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
      .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Y value");

var barChart = svg.selectAll(".bar")
  .data(dataset)
  .enter()
  .append("rect")
  .attr("class", "bar")
  .attr("fill", function(d) { return d.graphColor; })
  .attr("x", function(d) { return x(d.graphId); })
  .attr("width", x.rangeBand())
  .attr("height", 0)
  .attr("y", function(d) { return height; });

// アニメーション
barChart.transition()
    .delay(function (d, i) { return i * 100; })
    .duration(1000)
    .ease("bounce") // bounceの動きを指定する
    .attr("y", function(d) { return y(d.yVal); })
    .attr("height", function(d) { return height - y(d.yVal); });

// ツールチップ
var tooltip = d3.select("body")
  .append("div")
  .attr("class", "tooltip")
  .style("position", "absolute")
  .style("z-index", "10")
  .style("visibility", "hidden");

barChart
  .on("mouseover", function(){
     return tooltip.style("visibility", "visible");
  })
  .on("mousemove", function(d){
    return tooltip
      .style("top", (d3.event.pageY - 10) + "px")
      .style("left",(d3.event.pageX + 10) + "px")
      .html("<span>" + d.graphId + " : " + d.yVal + "</span>");
    })
  .on("mouseout", function(){
    return tooltip.style("visibility", "hidden");
  });

</script>

参考文献

http://bl.ocks.org/mbostock/3885304
* Tooltip
http://jsdo.it/benchan/psWz
* アニメーション
http://alexcoco.com/lets-make-a-bar-chart/
http://akiniwa.hatenablog.jp/entry/2014/02/23/121344

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