一. api简介
d3.tree()，创建一个树状图生成器
d3.tree().size()，定义树的大小
d3.hierarchy()，层级布局，需要和tree生成器一起使用，来得到绘制树所需要的节点数据和边数据
node.descendants()得到所有的节点，已经经过转换的数据
node.links()，得到所有的边，已经经过转换的数据
二.Vue中使用
*点击节点可展开收缩
<template lang='pug'>
div.tree-container(:id="id")
svg.d3-tree
g.container
</template>
<script>
/**
* 树状图
*/
//数据
const dataset = {
name:"中国",
children:[
{
name:"浙江",
children:[
{name:"杭州" ,value:100},
{name:"宁波",value:100},
{name:"温州",value:100},
{name:"绍兴",value:100}
]
},
{
name:"新疆" ,
children:
[
{name:"乌鲁木齐"},
{name:"克拉玛依"},
{name:"吐鲁番"},
{name:"哈密"}
]
},
{
name:"新疆" ,
children:
[
{name:"乌鲁木齐"},
{name:"克拉玛依"},
{name:"吐鲁番"},
{name:"哈密"}
]
}
]
}
import * as d3 from 'd3'
export default {
name: 'Scale',
data() {
return {
id: '',
zoom: null,
index: 0,
duration: 750,
root: null,
nodes: [],
links: [],
dTreeData: null,
transform: null,
margin: { top: 20, right: 90, bottom: 30, left: 90 }
}
},
methods: {
uuid () {
function s4 () {
return Math.floor((1 + Math.random()) * 0x10000)
.toString(16)
.substring(1)
}
return (
s4() + s4() + '-' + s4() + '-' + s4() + '-' + s4() + '-' + s4() + s4() + s4()
)
},
/**
* @description 获取构造根节点
*/
getRoot () {
let root = d3.hierarchy(dataset, d => {
return d.children
})
root.x0 = this.height / 2
root.y0 = 0
return root
},
clickNode (d) {
if (!d._children && !d.children)
return
if (d.children) {
this.$set(d, '_children', d.children)
d.children = null
} else {
this.$set(d, 'children', d._children)
d._children = null
}
this.$nextTick(
() => {
this.update(d)
}
)
},
diagonal (s, d) {
return `M ${s.y} ${s.x}
C ${(s.y + d.y) / 2} ${s.x},
${(s.y + d.y) / 2} ${d.x},
${d.y} ${d.x}`
},
/**
* @description 获取构造的node数据和link数据
*/
getNodesAndLinks () {
// treemap generate new x、y coordinate according to root node,
// so can‘t use computed propter of vue
this.dTreeData = this.treemap(this.root)
this.nodes = this.dTreeData.descendants()
this.links = this.dTreeData.descendants().slice(1)
},
/**
* @description 数据与Dom进行绑定
*/
update (source) {
this.getNodesAndLinks()
this.nodes.forEach(d => {
d.y = d.depth * 180
})
// *************************** Nodes section *************************** //
// Update the nodes...
const svg = d3.select(this.$el).select('svg.d3-tree')
const container = svg.select('g.container')
let node = container.selectAll('g.node')
.data(this.nodes, d => {
return d.id || (d.id = ++this.index)
})
// Enter any new sources at the parent's previous position.
let nodeEnter = node.enter().append('g')
.attr('class', 'node')
.on('click', this.clickNode)
.attr('transform', d => {
return 'translate(' + source.y0 + ',' + source.x0 + ')'
})
nodeEnter.append("circle")
.attr("r", 10)
.style("fill", function(d) { return d.children || d._children ? "lightsteelblue" : "#fff"; });
nodeEnter.append("text")
.attr("x", function(d) { return d.children || d._children ? -15 : 15; })
.attr("dy", ".35em")
.attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
.text(function(d) { return d.data.name })
.style("fill-opacity", 1e-6);
// Transition nodes to their new position.
let nodeUpdate = nodeEnter.merge(node)
.transition()
.duration(this.duration)
.attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });
nodeUpdate.select("circle")
.attr("r", 10)
.attr("fill", "white")
.attr("stroke", "blue")
.attr("stroke-width", 1)
.style("fill", function(d) { return d.children || d._children ? "lightsteelblue" : "#fff"; });
nodeUpdate.select("text")
.style("fill-opacity", 1);
// Transition exiting nodes to the parent's new position.
let nodeExit = node.exit()
.transition()
.duration(this.duration)
.attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
.remove();
nodeExit.select("circle")
.attr("r", 1e-6);
nodeExit.select("text")
.style("fill-opacity", 1e-6);
// *************************** Links section *************************** //
// Update the links…
let link = container.selectAll('path.link')
.data(this.links, d => { return d.id })
// Enter any new links at the parent's previous position.
let linkEnter = link.enter().insert("path", "g")
.attr("class", "link")
.attr("d", d => {
let o = {x: source.x0, y: source.y0};
return this.diagonal(o, o)
})
.attr("fill", 'none')
.attr("stroke-width", 1)
.attr('stroke', '#ccc')
// Transition links to their new position.
let linkUpdate = linkEnter.merge(link)
linkUpdate.transition()
.duration(this.duration)
.attr('d', d => { return this.diagonal(d, d.parent) })
// Transition exiting nodes to the parent's new position.
link.exit().transition()
.duration(this.duration)
.attr("d", d => {
let o = {x: source.x, y: source.y};
return this.diagonal(o, o)
})
.remove();
// Stash the old positions for transition.
this.nodes.forEach(d => {
d.x0 = d.x
d.y0 = d.y
})
},
/**
* @description control the canvas zoom to up or down
*/
zoomed () {
d3.select(this.$el).select('g.container').attr('transform', d3.event.transform)
}
},
created() {
this.id = this.uuid()
},
mounted () {
//创建svg画布
this.width = document.getElementById(this.id).clientWidth
this.height = document.getElementById(this.id).clientHeight
const svg = d3.select(this.$el).select('svg.d3-tree')
.attr('width', this.width)
.attr('height', this.height)
const transform = d3.zoomIdentity.translate(this.margin.left, this.margin.top).scale(1)
const container = svg.select('g.container')
// init zoom behavior, which is both an object and function
this.zoom = d3.zoom()
.scaleExtent([1 / 2, 8])
.on('zoom', this.zoomed)
container.transition().duration(750).call(this.zoom.transform, transform)
svg.call(this.zoom)
this.root = this.getRoot()
this.update(this.root)
},
computed: {
treemap () {
return d3.tree().size([this.height, this.width])
}
}
}
</script>
<style lang='scss' scoped>
.tree-container {
width: 100%;
height: 1000px;
}
.d3-tree {
.node {
cursor: pointer;
}
.node circle {
fill: #fff;
stroke: steelblue;
stroke-width: 1.5px;
}
.node text {
font: 18px sans-serif;
}
.link {
fill: none;
stroke: #ccc;
stroke-width: 1.5px;
}
}
</style>
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