line chart
FIG discount svg polyline element may be used polylineto define a set of connected straight line segments, it is recommended to use more d3.line()and pathelements in combination, and more flexible.
d3.line()We construct a new line generator, a default.xand.yset x, y accessor functions.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div id="test-svg">
</div>
</body>
<script src="https://d3js.org/d3.v5.js"></script>
<script>
window.onload = function() {
// 数据
var data = [{
date: new Date(2019, 3, 24),
value: 23.24
}, {
date: new Date(2019, 3, 25),
value: 72.15
}, {
date: new Date(2019, 3, 26),
value: 38.84
}, {
date: new Date(2019, 3, 27),
value: 58.62
}, {
date: new Date(2019, 3, 30),
value: 10.80
}, {
date: new Date(2019, 4, 1),
value: 85.47
}];
var width = 800,
height = 400,
padding = {
top: 40,
right: 40,
bottom: 40,
left: 40
};
var colors = d3.schemeSet2;
var svg = d3.select("#test-svg")
.append('svg')
.attr('width', width + 'px')
.attr('height', height + 'px');
// x轴:时间轴
var xScale = d3.scaleTime()
.domain(d3.extent(data, function(d) {
return d.date;
}))
.range([padding.left, width - padding.right]);
var xAxis = d3.axisBottom()
.scale(xScale)
.tickSize(10);
svg.append('g')
.call(xAxis)
.attr("transform", "translate(0," + (height - padding.bottom) + ")")
.selectAll("text")
.attr("font-size", "10px")
.attr("dx", "50px");
// y轴
var yScale = d3.scaleLinear()
.domain([0, d3.max(data, function(d) {
return d.value;
})])
.range([height - padding.bottom, padding.top]);
var yAxis = d3.axisLeft()
.scale(yScale)
.ticks(10);
svg.append('g')
.call(yAxis)
.attr("transform", "translate(" + padding.left + ",0)");
var line = d3.line()
.x(function(d) {
return xScale(d.date);
})
.y(function(d) {
return yScale(d.value);
});
// 生成折线
svg.append("path")
.datum(data)
.attr("fill", "none")
.attr("stroke", "steelblue")
.attr("stroke-width", 1.5)
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round")
.attr("d", line);
}
</script>
</html>
stroke-linecap
The shape of both ends of the path.
Property Value: butt | round | square | inherit
stroke-linejoin
The shape of the corner path using
Property Value: miter | round | bevel | inherit
Pie
- Pie Chart Layout cake is generally used
d3.pie()and the arc generatorsd3.arc()to draw.
Cake layout d3.pie ()
// 生成饼布局
var pie = d3.pie().value(function(d) {
return d.value;
})(data);
startAngle: Arc starting angle (angle span default 2π ≈6.283185307179586)endAngle: Arc angle endpadAngleThe spacing between the arc:value: Value
Arc generator d3.arc ()
In general there are four cases:
1) Round: 0 is the radius, outer radius greater than 0, and equal to a circular arc greater than 2π. It generates an outside radius of the circle radius
2) segment: the radius is 0, outer radius greater than 0, and a circular arc is less than 2π. Generated outside a circle with the radius of the fan
3) Ring: 0 is greater than the inner radius, outer radius greater than 0, and equal to a circular arc greater than 2π. It will generate a ring
4) annular sectors: inner radius is greater than 0, outer radius greater than 0, and a circular arc is less than 2π. It generates an annular sector
Round Pie
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div id="test-svg">
</div>
</body>
<script src="https://d3js.org/d3.v5.js"></script>
<script>
window.onload = function() {
// 数据
var data = [{
value: 335,
name: '直接访问'
}, {
value: 310,
name: '邮件营销'
}, {
value: 234,
name: '联盟广告'
}, {
value: 135,
name: '视频广告'
}, {
value: 1548,
name: '搜索引擎'
}];
var width = 400,
height = 400,
padding = {
top: 40,
right: 40,
bottom: 40,
left: 40
};
var colors = d3.schemeSet2;
var svg = d3.select("#test-svg")
.append('svg')
.attr('width', (width * 2) + 'px')
.attr('height', (height * 2) + 'px');
// 生成饼布局
var pie = d3.pie().value(function(d) {
return d.value;
})(data);
var radius = Math.min(width, height);
/*
* 弧线生成器
* .innerRadius 内圆半径
* .outerRadius 外圆半径
* .centroid 计算弧的中心
*/
var arc = d3.arc()
.innerRadius(0)
.outerRadius(radius / 2);
// 一个更大的圆弧，用来获取标注线外圈的坐标
var outArc = d3.arc()
.innerRadius(radius / 2)
.outerRadius(radius);
var line = d3.line()
.x(function(d) {
return d[0];
})
.y(function(d) {
return d[1];
});
// 获取标注线的点数据
var getLabelLine = function(d, type) {
var startPos = d.startAngle + (d.endAngle - d.startAngle) / 2;
var data = [];
var ra = (type === "text") ? 2.5 : 1;
data.push(arc.centroid(d));
data.push(outArc.centroid(d));
data.push({
0: outArc.centroid(d)[0] + (40 * (startPos < Math.PI ? 1 : -ra)),
1: outArc.centroid(d)[1]
});
return data;
}
var containers = svg.append("g")
.attr("transform", "translate(" + height + "," + height + ")");
var container = containers.selectAll("g")
.data(pie)
.join("g");
// 绘制饼图
container.append("path")
.attr("stroke", "white")
.attr("d", arc)
.attr("fill", function(d, i) {
return colors[i];
});
// 绘制标注线
container.append("path")
.datum(function(d) {
return getLabelLine(d, "path");
})
.attr("class", "tips")
.attr("fill", "none")
.attr("stroke", "steelblue")
.attr("stroke-width", 1)
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round")
.attr("d", line);
// 绘制标注线上文字
container.append("text")
.datum(function(d) {
d.pos = getLabelLine(d, "text")[2];
return d;
})
.text(function(d) {
return d.data.name;
})
.attr("dx", function(d) {
return d.pos[0]
})
.attr("dy", function(d) {
return d.pos[1]
});
}
</script>
</html>
Fan-shaped pie
var pie = d3.pie().startAngle(0).endAngle(Math.PI).value(function(d) {
return d.value;
})(data);
var radius = Math.min(width, height);
var arc = d3.arc()
.innerRadius(0)
.outerRadius(radius / 2);
Ring Pie
var pie = d3.pie().value(function(d) {
return d.value;
})(data);
var radius = Math.min(width, height);
var arc = d3.arc()
.innerRadius(radius / 4)
.outerRadius(radius / 2);
Annular slice of the pie
var pie = d3.pie().startAngle(0).endAngle(Math.PI).value(function(d) {
return d.value;
})(data);
var radius = Math.min(width, height);
var arc = d3.arc()
.innerRadius(radius / 4)
.outerRadius(radius / 2);
