d3.js で折れ線グラフを描画する方法のメモ。
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;utf-8">
<title>graph</title>
</head>
<body>
<div id="graph"></div>
<script type="text/javascript" src="../d3.min.js"></script>
<script type="text/javascript">
const org_dataset = [
['01/01', 4],
['01/02', 5],
['01/03', 8],
['01/04', 10],
['01/05', 9],
['01/06', 12],
['01/07', 8],
['01/08', 7],
['01/09', 6],
['01/10', 8],
];
const dataset = [];
for (let i = 0; i < org_dataset.length; i++) {
let d = org_dataset[i];
dataset.push({date: d[0], x: i, y: d[1]});
}
const width = 600;
const height = 400;
const margin = { "top": 40, "bottom": 40, "right": 40, "left": 40 };
const svg =
d3.select("body")
.append("svg")
.attr("width", margin.left+width+margin.right)
.attr("height", margin.top+height+margin.bottom)
;
var xScale =
d3.scaleLinear()
.domain([0, d3.max(dataset, function(d) { return d.x; })])
.range([margin.left, margin.left+width])
;
var yScale =
d3.scaleLinear()
.domain([0, d3.max(dataset, function(d) { return d.y; })])
.range([margin.top+height, margin.top])
;
var xAxis =
d3.axisBottom(xScale)
.ticks(5)
.tickFormat((d) => { return dataset[d].date; })
;
var yAxis =
d3.axisLeft(yScale)
.ticks(5);
svg.append("g")
.attr("transform",
"translate(" +
[0, margin.top+height].join(",")
+ ")")
.call(xAxis)
.append("text")
.attr("fill", "black")
.attr("x", (margin.left+width+margin.right)/2)
.attr("y", margin.bottom/2)
.attr("text-anchor", "middle")
.attr("font-size", "10pt")
.text("日付");
svg.append("g")
.attr("transform",
"translate(" +
[margin.left, 0].join(",")
+ ")")
.call(yAxis)
.append("text")
.attr("fill", "black")
.attr("text-anchor", "middle")
.attr("x", -(height+margin.top+margin.bottom)/2)
.attr("y", -margin.left/2)
.attr("transform", "rotate(-90)")
.attr("font-size", "10pt")
.text("値");
svg.append("path")
.datum(dataset)
.attr("fill", "none")
.attr("stroke", "steelblue")
.attr("stroke-width", 1.5)
.attr("d", d3.line()
.x(function(d) { return xScale(d.x); })
.y(function(d) { return yScale(d.y); })
);
</script>
</body>
</html>
