这篇文章主要介绍了关于如何用d3.js实现拓扑图，有着一定的参考价值，现在分享给大家，有需要的朋友可以参考一下
最近写项目需要画出应用程序调用链的网路拓扑图，完全自己写需要花费些时间，那么首先想到的是echarts,但echarts的自定义写法写起来非常麻烦，而且它的文档都是基于配置说明的，对于自定义开发不太方便，尝试后果断放弃，改用D3.js，自己完全可控。
我们先看看效果
![3420275523-5b37148dc6036_articlex[1].png](https://img.php.cn//upload/image/361/201/289/1531214809439835.png "1531214809439835.png")
我把代码分享下，供和我一样刚接触D3的同学参考，不对的地方欢迎指正！
完整代码：
html：
Title
JS：
const fontSize = 10;
const symbolSize = 40;
const padding = 10;
/*
* 调用 new Togo(svg,option).render();
* */
class Togo {
/**/
constructor(svg, option) {
this.data = option.data;
this.edges = option.edges;
this.svg = d3.select(svg);
}
//主渲染方法
render() {
this.scale = 1;
this.width = this.svg.attr('width');
this.height = this.svg.attr('height');
this.container = this.svg.append('g')
.attr('transform', 'scale(' + this.scale + ')');
this.initPosition();
this.initDefineSymbol();
this.initLink();
this.initNode();
this.initZoom();
}
//初始化节点位置
initPosition() {
let origin = [this.width / 2, this.height / 2];
let points = this.getVertices(origin, Math.min(this.width, this.height) * 0.3, this.data.length);
this.data.forEach((item, i) => {
item.x = points[i].x;
item.y = points[i].y;
})
}
//根据多边形获取定位点
getVertices(origin, r, n) {
if (typeof n !== 'number') return;
var ox = origin[0];
var oy = origin[1];
var angle = 360 / n;
var i = 0;
var points = [];
var tempAngle = 0;
while (i < n) {
tempAngle = (i * angle * Math.PI) / 180;
points.push({
x: ox + r * Math.sin(tempAngle),
y: oy + r * Math.cos(tempAngle),
});
i++;
}
return points;
}
//两点的中心点
getCenter(x1, y1, x2, y2) {
return [(x1 + x2) / 2, (y1 + y2) / 2]
}
//两点的距离
getDistance(x1, y1, x2, y2) {
return Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
}
//两点角度
getAngle(x1, y1, x2, y2) {
var x = Math.abs(x1 - x2);
var y = Math.abs(y1 - y2);
var z = Math.sqrt(x * x + y * y);
return Math.round((Math.asin(y / z) / Math.PI * 180));
}
//初始化缩放器
initZoom() {
let self = this;
let zoom = d3.zoom()
.scaleExtent([0.7, 3])
.on('zoom', function () {
self.onZoom(this)
});
this.svg.call(zoom)
}
//初始化图标
initDefineSymbol() {
let defs=this.container.append('svg:defs');
//箭头
const marker = defs
.selectAll('marker')
.data(this.edges)
.enter()
.append('svg:marker')
.attr('id', (link, i) => 'marker-' + i)
.attr('markerUnits', 'userSpaceOnUse')
.attr('viewBox', '0 -5 10 10')
.attr('refX', symbolSize / 2 + padding)
.attr('refY', 0)
.attr('markerWidth', 14)
.attr('markerHeight', 14)
.attr('orient', 'auto')
.attr('stroke-width', 2)
.append('svg:path')
.attr('d', 'M2,0 L0,-3 L9,0 L0,3 M2,0 L0,-3')
.attr('class','arrow')
//数据库
let database =defs.append('g')
.attr('id','database')
.attr('transform','scale(0.042)');
database.append('path')
.attr('d','M512 800c-247.42 0-448-71.63-448-160v160c0 88.37 200.58 160 448 160s448-71.63 448-160V640c0 88.37-200.58 160-448 160z')
database.append('path')
.attr('d','M512 608c-247.42 0-448-71.63-448-160v160c0 88.37 200.58 160 448 160s448-71.63 448-160V448c0 88.37-200.58 160-448 160z') ;
database.append('path')
.attr('d','M512 416c-247.42 0-448-71.63-448-160v160c0 88.37 200.58 160 448 160s448-71.63 448-160V256c0 88.37-200.58 160-448 160z') ;
database.append('path')
.attr('d','M64 224a448 160 0 1 0 896 0 448 160 0 1 0-896 0Z');
//云
let cloud=defs.append('g')
.attr('id','cloud')
.attr('transform','scale(0.042)')
.append('path')
.attr('d','M709.3 285.8C668.3 202.7 583 145.4 484 145.4c-132.6 0-241 102.8-250.4 233-97.5 27.8-168.5 113-168.5 213.8 0 118.9 98.8 216.6 223.4 223.4h418.9c138.7 0 251.3-118.8 251.3-265.3 0-141.2-110.3-256.2-249.4-264.5z')
}
//初始化链接线
initLink() {
this.drawLinkLine();
this.drawLinkText();
}
//初始化节点
initNode() {
var self = this;
//节点容器
this.nodes = this.container.selectAll(".node")
.data(this.data)
.enter()
.append("g")
.attr("transform", function (d) {
return "translate(" + d.x + "," + d.y + ")";
})
.call(d3.drag()
.on("drag", function (d) {
self.onDrag(this, d)
})
)
.on('click', function () {
alert()
})
//节点背景默认覆盖层
this.nodes.append('circle')
.attr('r', symbolSize / 2 + padding)
.attr('class', 'node-bg');
//节点图标
this.drawNodeSymbol();
//节点标题
this.drawNodeTitle();
//节点其他说明
this.drawNodeOther();
this.drawNodeCode();
}
//画节点语言标识
drawNodeCode() {
this.nodeCodes = this.nodes.filter(item => item.type == 'app')
.append('g')
.attr('class','node-code')
.attr('transform', 'translate(' + -symbolSize / 2 + ',' + symbolSize / 3 + ')')
this.nodeCodes
.append('circle')
.attr('r', d => fontSize / 2 * d.code.length / 2 + 3)
this.nodeCodes
.append('text')
.attr('dy', fontSize / 2)
.text(item => item.code);
}
//画节点图标
drawNodeSymbol() {
//绘制节点
this.nodes.filter(item=>item.type=='app')
.append("circle")
.attr("r", symbolSize / 2)
.attr("fill", '#fff')
.attr('class', function (d) {
return 'health'+d.health;
})
.attr('stroke-width', '5px')
this.nodes.filter(item=>item.type=='database')
.append('use')
.attr('xlink:href','#database')
.attr('x',function () {
return -this.getBBox().width/2
})
.attr('y',function () {
return -this.getBBox().height/2
})
this.nodes.filter(item=>item.type=='cloud')
.append('use')
.attr('xlink:href','#cloud')
.attr('x',function () {
return -this.getBBox().width/2
})
.attr('y',function () {
return -this.getBBox().height/2
})
}
//画节点右侧信息
drawNodeOther() {
//如果是应用的时候
this.nodeOthers = this.nodes.filter(item => item.type == 'app')
.append("text")
.attr("x", symbolSize / 2 + padding)
.attr("y", -5)
.attr('class','node-other')
this.nodeOthers.append('tspan')
.text(d => d.time + 'ms');
this.nodeOthers.append('tspan')
.text(d => d.rpm + 'rpm')
.attr('x', symbolSize / 2 + padding)
.attr('dy', '1em');
this.nodeOthers.append('tspan')
.text(d => d.epm + 'epm')
.attr('x', symbolSize / 2 + padding)
.attr('dy', '1em')
}
//画节点标题
drawNodeTitle() {
//节点标题
this.nodes.append("text")
.attr('class','node-title')
.text(function (d) {
return d.name;
})
.attr("dy", symbolSize)
this.nodes.filter(item => item.type == 'app').append("text")
.text(function (d) {
return d.active + '/' + d.total;
})
.attr('dy', fontSize / 2)
.attr('class','node-call')
}
//画节点链接线
drawLinkLine() {
let data = this.data;
if (this.lineGroup) {
this.lineGroup.selectAll('.link')
.attr(
'd', link => genLinkPath(link),
)
} else {
this.lineGroup = this.container.append('g')
this.lineGroup.selectAll('.link')
.data(this.edges)
.enter()
.append('path')
.attr('class', 'link')
.attr(
'marker-end', (link, i) => 'url(#' + 'marker-' + i + ')'
).attr(
'd', link => genLinkPath(link),
).attr(
'id', (link, i) => 'link-' + i
)
.on('click', () => { alert() })
}
function genLinkPath(d) {
let sx = data[d.source].x;
let tx = data[d.target].x;
let sy = data[d.source].y;
let ty = data[d.target].y;
return 'M' + sx + ',' + sy + ' L' + tx + ',' + ty;
}
}
drawLinkText() {
let data = this.data;
let self = this;
if (this.lineTextGroup) {
this.lineTexts
.attr('transform', getTransform)
} else {
this.lineTextGroup = this.container.append('g')
this.lineTexts = this.lineTextGroup
.selectAll('.linetext')
.data(this.edges)
.enter()
.append('text')
.attr('dy', -2)
.attr('transform', getTransform)
.on('click', () => { alert() })
this.lineTexts
.append('tspan')
.text((d, i) => this.data[d.source].lineTime + 'ms,' + this.data[d.source].lineRpm + 'rpm');
this.lineTexts
.append('tspan')
.text((d, i) => this.data[d.source].lineProtocol)
.attr('dy', '1em')
.attr('dx', function () {
return -this.getBBox().width / 2
})
}
function getTransform(link) {
let s = data[link.source];
let t = data[link.target];
let p = self.getCenter(s.x, s.y, t.x, t.y);
let angle = self.getAngle(s.x, s.y, t.x, t.y);
if (s.x > t.x && s.y < t.y || s.x < t.x && s.y > t.y) {
angle = -angle
}
return 'translate(' + p[0] + ',' + p[1] + ') rotate(' + angle + ')'
}
}
update(d) {
this.drawLinkLine();
this.drawLinkText();
}
//拖拽方法
onDrag(ele, d) {
d.x = d3.event.x;
d.y = d3.event.y;
d3.select(ele)
.attr('transform', "translate(" + d3.event.x + "," + d3.event.y + ")")
this.update(d);
}
//缩放方法
onZoom(ele) {
var transform = d3.zoomTransform(ele);
this.scale = transform.k;
this.container.attr('transform', "translate(" + transform.x + "," + transform.y + ")scale(" + transform.k + ")")
}
}数据：
let __options={
data:[{
type:'app',
name: 'monitor-web-server',
time: 30,
rpm: 40,
epm: 50,
active: 3,
total: 5,
code: 'java',
health: 1,
lineProtocol: 'http',
lineTime: 12,
lineRpm: 34,
}, {
type:'database',
name: 'Mysql',
time: 30,
rpm: 40,
epm: 50,
active: 3,
total: 5,
code: 'java',
health: 2,
lineProtocol: 'http',
lineTime: 12,
lineRpm: 34,
},
{
type:'app',
name: 'Redis',
time: 30,
rpm: 40,
epm: 50,
active: 3,
total: 5,
code: 'java',
health: 3,
lineProtocol: 'http',
lineTime: 12,
lineRpm: 34,
}, {
type:'cloud',
name: 'ES',
time: 30,
rpm: 40,
epm: 50,
active: 3,
total: 5,
code: 'java',
health: 1,
lineProtocol: 'http',
lineTime: 12,
lineRpm: 34,
value: 100
}
],
edges: [
{
source: 0,
target: 3,
}, {
source: 1,
target: 2,
}
, {
source: 1,
target: 3,
},
{
source: 0,
target: 1,
},
{
source: 0,
target: 2,
}
// {
// source: 3,
// target: 2,
// },
]
}以上就是本文的全部内容，希望对大家的学习有所帮助，更多相关内容请关注PHP中文网！
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