用D3.js制作分组条形图
我是D3.js的新手，我发现很难创建分组条形图，但我尝试了一些似乎不正确的方法。我要x轴上的月份数，y轴上的群组(火星和木星)数。类似于disLink。
var svg = d3.select("svg"),
margin = {top: 20, right: 20, bottom: 30, left: 40},
width = +svg.attr("width") - margin.left - margin.right, height = +svg.attr("height") - margin.top - margin.bottom;
var x = d3.scaleBand().rangeRound([0,
width]).padding(0.1),
y = d3.scaleLinear().rangeRound([height, 0]);
var g = svg.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var data = [
{"Group":"Mars","count":10,"months":"June"},
{"Group":"Jupiter","count":50,"months":"June"},
{"Group":"Mars","count":70,"months":"July"},
{"Group":"Jupiter","count":60,"months":"July"}];
var ymaxdomain=d3.max(d,function(d){return d.count;});
x.domain(d.map(function(d) {return d.months}));
y.domain([0,ymaxdomain]);
var x1=d3.scaleBand().rangeRound([0, x.bandwidth()]);
x1.domain(d.map(function(d) {return d.months;}));
g.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("x", function(d,i) {console.log(d,i); return (x(d.months))}
.attr("y", function(d) {return y(d.count); })
.attr("width",x1.bandwidth())
.attr("height", function(d) { return height - y(d.count); })
g.append("g")
.attr("class", "axis")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
g.append("g")
.attr("class", "axis")
.call(d3.axisLeft(y).ticks(null, "s"))
.append("text")
.attr("x", 2)
.attr("y", y(y.ticks().pop()) + 0.5)
.attr("dy", "0.32em")
.attr("fill", "#000")
.attr("font-weight", "bold")
.attr("text-anchor", "start")
.text("count");<style>
.bar {
fill: steelblue;
stroke:black
}
</style><!DOCTYPE html>
<svg width="600" height="600"></svg>
<body><script src="//d3js.org/d3.v4.min.js"></script></body>解决方案
若要创建分组条形图，您必须为x位置设置两个刻度：
var x = d3.scaleBand().rangeRound([0, width])
.padding(0.1);
var x1 = d3.scaleBand()
.rangeRound([0, x.bandwidth()])
.padding(0.05);
然后，使用第一个刻度追加组.
var groups = g.selectAll(null)
.data(data)
.enter()
.append("g")
.attr("transform", function(d) {
return "translate(" + x(d.months) + ",0)";
})
..。并且，在每个组内，使用第二个刻度附加矩形。
这里是演示：
var svg = d3.select("svg"),
margin = {
top: 20,
right: 20,
bottom: 30,
left: 40
},
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom;
var color = d3.scaleOrdinal(d3.schemeCategory10);
var x = d3.scaleBand().rangeRound([0, width])
.padding(0.1),
y = d3.scaleLinear().rangeRound([height, 0]);
var g = svg.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var data = [{
"Group": "Mars",
"count": 10,
"months": "June"
}, {
"Group": "Jupiter",
"count": 50,
"months": "June"
}, {
"Group": "Mars",
"count": 70,
"months": "July"
}, {
"Group": "Jupiter",
"count": 60,
"months": "July"
}];
var ymaxdomain = d3.max(data, function(d) {
return d.count;
});
x.domain(data.map(function(d) {
return d.months
}));
y.domain([0, ymaxdomain]);
var x1 = d3.scaleBand()
.rangeRound([0, x.bandwidth()])
.padding(0.05)
.domain(data.map(function(d) {
return d.Group;
}));
color.domain(data.map(function(d) {
return d.Group;
}));
var groups = g.selectAll(null)
.data(data)
.enter()
.append("g")
.attr("transform", function(d) {
return "translate(" + x(d.months) + ",0)";
})
var bars = groups.selectAll(null)
.data(function(d) {
return [d]
})
.enter()
.append("rect")
.attr("x", function(d, i) {
return x1(d.Group)
})
.attr("y", function(d) {
return y(d.count);
})
.attr("width", x1.bandwidth())
.attr("height", function(d) {
return height - y(d.count);
})
.attr("fill", function(d) {
return color(d.Group)
})
g.append("g")
.attr("class", "axis")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
g.append("g")
.attr("class", "axis")
.call(d3.axisLeft(y).ticks(null, "s"))
.append("text")
.attr("x", 2)
.attr("y", y(y.ticks().pop()) + 0.5)
.attr("dy", "0.32em")
.attr("fill", "#000")
.attr("font-weight", "bold")
.attr("text-anchor", "start")
.text("count");.bar {
fill: steelblue;
stroke: black
}<svg width="600" height="600"></svg>
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