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@shimizu
Last active February 21, 2018 03:08
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D3 Axis Tips#3 - Inner Tick Label
license: mit

Axis Tips #3

Tick(ラベル)を内向きに表示するにする。

点線をドラッグしてチャートのサイズを変更することができます。

<!DOCTYPE html>
<html lang="jp">
<head>
<style>
html, body {
margin: 0px;
padding: 0px;
width:100%;
height:100%;
}
#chart {
width: 80%;
height: 80%;
border: 8px dashed gray;
border-left: none;
border-top:none;
cursor:all-scroll;
}
#chart svg{
width: 100%;
height: 100%;
cursor: default;
}
.grid .tick line {
stroke:#ccc;
stroke-dasharray:1;
}
.line {
stroke:skyblue;
stroke-width:2;
fill:none;
}
</style>
<script src="//unpkg.com/babel-standalone@6.26.0/babel.min.js"></script>
<script src="//unpkg.com/d3@4.12.2/build/d3.min.js"></script>
</head>
<body>
<div id="chart">
<svg></svg>
</div>
<script type="text/babel">
const data = d3.range(0, 12).map(d => { console.log(d,new Date(2017,d,1)) ;return {date:new Date(2017,d,1), value:~~(Math.random() * 99 + 1)} });
const svg = d3.select("#chart").select("svg");
const grid = svg.append("g").classed("grid", true);
const plot = svg.append("g").classed("plot", true);
const axis = svg.append("g").classed("axis", true);
const yScale = d3.scaleLinear().domain([100, 0]);
const xScale = d3.scaleTime().domain([new Date(2016,11,1), new Date(2017,12,1)]);
const lineGen = d3.line()
.x(d => xScale(d.date))
.y(d => yScale(d.value))
const yearFormat = d3.timeFormat("%Y年");
const monthFormat = d3.timeFormat("%m月");
render();
function render(){
const m = {top:30, left:20, right:20, bottom:30};
const w = svg.node().clientWidth || svg.node().parentNode.clientWidth;
const h = svg.node().clientHeight || svg.node().parentNode.clientHeight;
const pw = w - (m.left + m.right);
const ph = h - (m.top + m.bottom);
yScale.range([0, ph]);
xScale.range([0, pw]);
//axis layer
axis.attr("transform", `translate(${m.left}, ${m.top})`);
//y axis
const yAxisUpdate = axis.selectAll(".yAxis").data([null]);
const yAxisEnter = yAxisUpdate.enter().append("g").classed("yAxis", true);
const yAxisRender = d3.axisRight().scale(yScale); //左側のaxisにaxisRightを使うことでラベルを内向きにする
const yAxis = yAxisUpdate.merge(yAxisEnter).call(yAxisRender);
yAxis.select(".domain").remove();
yAxis.selectAll(".tick line").remove();
//tickラベルの表示位置を調整する
yAxis.selectAll(".tick text")
.attr("text-anchor", "end") //ラベルを右寄せにする(お好みで)
.attr("y" , "-0.5em")
.attr("x", "1.5em");
//x axis
const xAxisUpdate = axis.selectAll(".xAxis").data([null]);
const xAxisEnter = xAxisUpdate.enter().append("g").classed("xAxis", true);
const renderAxis = d3.axisBottom().scale(xScale)
.tickFormat(d => {
return monthFormat(d).replace(/^0/, "");
})
.tickValues(data.map(d => d.date)) //データが存在する範囲のtickだけを表示するように制限する
const xAxis = xAxisUpdate.merge(xAxisEnter).call(renderAxis)
.attr("transform", `translate(0, ${ph})`);
xAxis.select(".domain").remove();
xAxis.selectAll(".tick line").remove();
//grid layer
grid.attr("transform", `translate(${m.left}, ${m.top})`)
//y grid
const yGridUpdate = grid.selectAll(".yGrid").data([null]);
const yGridEnter = yGridUpdate.enter().append("g").classed("yGrid", true);
const yGrid = yGridUpdate.merge(yGridEnter).call( d3.axisLeft().scale(yScale).tickSizeInner(-pw).tickFormat(() => null) );
yGrid.select(".domain").remove();
//plot layer
plot.attr("transform", `translate(${m.left}, ${m.top})`)
//line
const lineUpdate = plot.selectAll("path").data([data]);
const lineEnter = lineUpdate.enter().append("path").classed("line", true);
const line = lineUpdate.merge(lineEnter)
.attr("d", lineGen);
}
//divエレメントをドラッグでリサイズできるようにする。
const dispatch = d3.dispatch("resize");
dispatch.on("resize", render);
setResizeControler();
function setResizeControler(){
const drag = d3.drag()
.on("drag", resized)
d3.select("#chart")
.call(drag);
function resized(e){
const s = d3.event.sourceEvent;
const w = (s.pageX < 300) ? 300 : s.pageX;
const h = (s.pageY < 200) ? 200 : s.pageY;
d3.select(this)
.style("width", `${w}px`)
.style("height", `${h}px`)
.attr("data-test", "test")
dispatch.call("resize");
}
}
</script>
</body>
</html>
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