d3.js - 饼图未使用 D3 v5 在仪表板区域中呈现
问题描述
我一直在尝试使用右下角的 D3.JS v5 渲染一个简单的二值饼图,但无济于事。有人可以帮助我吗 - 代码可以在这里找到:
<body>
<div id = "orgChart"></div>
<div id = "mapChart"></div>
<div id = "pieChart"></div>
<script>
/******************************************************************************
Pie Chart
******************************************************************************/
function makePie() {
var widthPie = (window.innerWidth * 0.3) ,
heightPie = (window.innerHeight * 0.3);
var data = [
{name: "Males", count: 43, percent: 61 }
, {name: "Females", count: 27, percent: 39}
];
var pie = d3.pie().value(d=>d.count).padAngle(0.025)(data);
var arcMkr = d3.arc().innerRadius(20).outerRadius(35)
.cornerRadius(4);
var scC = d3.scaleOrdinal(d3.schemePastel1)
.domain(pie.map(d=>d.index));
var g = d3.select("#pieChart")
.append("g").attr("transform", "translate(widthPie/2, heightPie/2)");
g.selectAll("path.x").data(pie).enter().append("path")
.attr("d", arcMkr)
.attr("fill", d=> scC(d.index)).attr("stroke", "grey");
g.selectAll("text.x" ).data( pie ).enter().append( "text")
.text(d => d.data.name +": " + d.data.percent + "%")
.attr("x", d=>arcMkr.innerRadius(20).centroid(d)[0])
.attr("y", d=>arcMkr.innerRadius(20).centroid(d)[1])
.attr("font-family", "sans-serif").attr( "font-size", 8)
.attr("text-anchor", "middle")
;
}
makePie();
</script>
解决方案
正如@Tom Shanley 在评论中指出的那样,您的饼图未按预期呈现的原因是因为您需要先创建一个 SVG。
请注意,我还更改了#pieChart 的一些 CSS 属性以提高片段的可见性,尽管这对于您的目的来说不是必需的。
<!DOCTYPE html>
<html lang = 'en'>
<head>
<meta charset = 'utf-8'>
<meta name = 'viewport' content = 'width = device-width, initial-scale = 1.0'>
<meta http-equiv = 'X-UA-Compatible' content = 'ie=edge'>
<meta name = 'author' content = "Tom Bellmer">
<meta name = 'date.created' content="03/05/2020">
<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v5.min.js"></script>
<title>Org Chart</title>
<style>
body{
background-color: #faf2e4;
font-family: sans-serif;
font-size: 1.2em;
}
text{font-size: .6em}
.node circle {
fill: #fff;
stroke: steelblue;
stroke-width: 1px;
}
.node text {
font: 9px sans-serif;
font-weight: normal;
}
.link {
fill: none;
stroke: #ccc;
stroke-width: 1px;
}
#orgChart{
position:absolute;
top: 10px;
left: 10px;
width: 65%;
height: 85%;
}
#mapChart{
position:absolute;
top: 10px;
left: 66%;
width: 34%;
height: 50%;
}
#pieChart{
position:absolute;
top: 51%;
left: 66%;
width: 34%;
height: 55%;
background-color: crimson;
}
circle {
/* fill: #FF8533; */
fill: steelblue;
fill-opacity: .8;
stroke: #fff;
}
circle:hover { fill: red;}
div.tooltip {
position: absolute;
text-align: center;
width: 130px;
height: 14px;
padding: 2px;
font: 11px sans-serif;
background: dodgerblue;
color: white;
border: 0px;
pointer-events: none;
}
svg g{
fill: white;
stroke: black;
}
svg text{fill: black;}
</style>
</head>
<body>
<div id = "orgChart"></div>
<div id = "mapChart"></div>
<div id = "pieChart"></div>
<script>
/******************************************************************************
Pie Chart
******************************************************************************/
function makePie() {
var widthPie = (window.innerWidth * 0.5) ,
heightPie = (window.innerHeight * 0.5);
var data = [
{name: "Males", count: 43, percent: 61 },
{name: "Females", count: 27, percent: 39}
];
var pie = d3.pie().value(d=>d.count).padAngle(0.025)(data);
var arcMkr = d3.arc().innerRadius(20).outerRadius(35)
.cornerRadius(4);
var scC = d3.scaleOrdinal(d3.schemePastel1)
.domain(pie.map(d=>d.index));
// Modified ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
var svg = d3.select("#pieChart")
.append("svg")
.attr("width", widthPie)
.attr("height", heightPie);
var g = svg.append("g").attr("transform", `translate(${widthPie/2}, ${heightPie/2})`);
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
g.selectAll("path.x").data(pie).enter().append("path")
.attr("d", arcMkr)
.attr("fill", d=> scC(d.index)).attr("stroke", "grey");
g.selectAll("text.x" ).data( pie ).enter().append( "text")
.text(d => d.data.name +": " + d.data.percent + "%")
.attr("x", d=>arcMkr.innerRadius(20).centroid(d)[0])
.attr("y", d=>arcMkr.innerRadius(20).centroid(d)[1])
.attr("font-family", "sans-serif").attr( "font-size", 8)
.attr("text-anchor", "middle");
}
makePie();
</script>
</body>
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