本实例是在网络搜索的结果下，自己改了些东西创建而成。实现了关系图的移动、拖拽、放大功能。以及数据的分类等等。代码稍显繁琐，如有建议可以评论区讨论。另外案例中的d3.js为3.5.17版本，请注意安装。
image.png
<!DOCTYPE html>
<html>
<head>
<style>
#divid {
cursor: pointer;
}
.tooltip {
font-family: SimHei;
font-size: 12px;
position: fixed;
background: #fff;
color: #000;
padding: 5px 10px;
border-radius: 5px;
}
</style>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
</head>
<body>
<!-- 力导向图div -->
<div id="divid"></div>
<script>
$(document).ready(function () {
showChart();
})
function showChart() {
var data = {
"links": [{
"source": "陆洋",
"data": {
"rzs": "1000万美元"
},
"target": "建银国际产业基金管理有限公司",
"relation": "投资",
"sourceImg": "http://mail.tom.com/error/i2.gif",
"targetImg": "",
"sourceColor": "#F4793B",
"targetColor": "#0084ff",
"sourceRadius": "30",
"targetRadius": "35",
},
{
"source": "陆洋",
"data": {
"rzs": "12万美元"
},
"target": "乾行文化投资公司",
"relation": "投资",
"sourceImg": "http://mail.tom.com/error/i2.gif",
"targetImg": "",
"sourceColor": "#F4793B",
"targetColor": "#0084ff",
"sourceRadius": "30",
"targetRadius": "35",
},
{
"source": "汪红辉",
"target": "乾行文化投资公司",
"relation": "总经理",
"sourceImg": "",
"targetImg": "",
"sourceColor": "#F4793B",
"targetColor": "#0084ff",
"sourceRadius": "30",
"targetRadius": "35",
},
{
"source": "汪红辉",
"target": "天津裕丰股权投资管理有限公司",
"relation": "董事",
"sourceImg": "",
"sourceImg": "",
"targetImg": "",
"sourceColor": "#F4793B",
"targetColor": "#0084ff",
"sourceRadius": "30",
"targetRadius": "35",
},
{
"source": "汪红辉",
"target": "乾行文化投资公司",
"relation": "法人",
"sourceImg": "",
"targetImg": "",
"sourceColor": "#F4793B",
"targetColor": "",
"sourceRadius": "30",
"targetRadius": "35",
},
{
"source": "汪红辉",
"target": "乾行文化投资公司",
"relation": "董事长",
"sourceImg": "",
"targetImg": "",
"sourceColor": "#F4793B",
"targetColor": "",
"sourceRadius": "30",
"targetRadius": "35",
},
{
"source": "汪红辉",
"target": "建银国际产业基金管理有限公司",
"relation": "董事",
"sourceImg": "",
"targetImg": "",
"sourceColor": "#F4793B",
"targetColor": "#0084ff",
"sourceRadius": "30",
"targetRadius": "35",
},
{
"source": "胡章宏",
"target": "建银国际产业基金管理有限公司",
"relation": "董事长",
"sourceImg": "",
"targetImg": "",
"sourceColor": "#F4793B",
"targetColor": "#0084ff",
"sourceRadius": "30",
"targetRadius": "35",
},
]
};
var options = {};
options.backgroundColor = "#eee";
options.nodesFontType = "SimHei";
options.nodesFontSize = 14;
options.lineFontType = "SimHei";
options.lineFontSize = 12;
options.lineColor = "#000000";
options.showExamples = true;
options.examplesX = 20;
options.examplesY = 450;
options.examplesFontColor = "#000000";
drawChart("divid", options, data);
}
function drawChart(divid, options, datas, dataFilter) {
var backgroundColor = options.backgroundColor; //背景颜色
var nodesFontType = options.nodesFontType; //节点字体
var nodesFontSize = options.nodesFontSize; //节点字号
var lineFontType = options.lineFontType; //关系字体
var lineFontSize = options.lineFontSize; //关系字号
var lineColor = options.lineColor; //连线颜色
var examplesFontColor = options.examplesFontColor; //关系示例字体颜色
var width = window.innerWidth; //画布宽
var height = window.innerHeight; //画布高
var svgChart = d3.select("svg");
svgChart.remove();
var tip = $(".tooltip");
if (tip.length > 0) {
tip.remove();
}
var sourceDatas = {};
sourceDatas.links = [];
for (var i = 0; i < datas.links.length; i++) {
var jsonObj = {};
jsonObj.source = datas.links[i].source;
jsonObj.target = datas.links[i].target;
jsonObj.relation = datas.links[i].relation;
jsonObj.sourceImg = datas.links[i].sourceImg;
jsonObj.targetImg = datas.links[i].targetImg;
jsonObj.sourceColor = datas.links[i].sourceColor;
jsonObj.targetColor = datas.links[i].targetColor;
jsonObj.sourceRadius = datas.links[i].sourceRadius;
jsonObj.targetRadius = datas.links[i].targetRadius;
// 根据关系类型添加连接线的颜色
// jsonObj.lineColor = datas.links[i].lineColor;
switch (datas.links[i].relation) {
case '投资':
jsonObj.lineColor = '#458B00';
break;
case '总经理':
jsonObj.lineColor = '#EEEE00';
break;
case '董事':
jsonObj.lineColor = '#8fd2e1';
break;
case '法人':
jsonObj.lineColor = '#c2de96';
break;
case '董事长':
jsonObj.lineColor = '#ff4c00';
break;
default:
jsonObj.lineColor = '#000';
}
jsonObj.data = datas.links[i].data;
sourceDatas.links.push(jsonObj);
}
var resourceLinks = sourceDatas.links;
if (dataFilter != undefined && dataFilter.length > 0) {
var indexArray = [];
for (var i = 0; i < dataFilter.length; i++) {
for (var j = 0; j < resourceLinks.length; j++) {
if (resourceLinks[j].relation == dataFilter[i].relation && dataFilter[i].isShow == "false") {
indexArray.push(j);
}
}
}
if (indexArray.length > 0) {
var tempArray = [];
for (var j = 0; j < resourceLinks.length; j++) {
for (var i = 0; i < indexArray.length; i++) {
if (indexArray[i] != j) {
if (i == indexArray.length - 1) {
tempArray.push(resourceLinks[j]);
break;
}
continue;
} else {
break;
}
}
}
resourceLinks = tempArray;
}
}
var links = resourceLinks;
//关系分组
var linkGroup = {};
//对连接线进行统计和分组，不区分连接线的方向，只要属于同两个实体，即认为是同一组
var linkmap = {};
for (var i = 0; i < links.length; i++) {
var key = links[i].source < links[i].target ? links[i].source + ':' + links[i].target : links[i]
.target + ':' + links[i].source;
if (!linkmap.hasOwnProperty(key)) {
linkmap[key] = 0;
}
linkmap[key] += 1;
if (!linkGroup.hasOwnProperty(key)) {
linkGroup[key] = [];
}
linkGroup[key].push(links[i]);
}
//为每一条连接线分配size属性，同时对每一组连接线进行编号
for (var i = 0; i < links.length; i++) {
var key = links[i].source < links[i].target ? links[i].source + ':' + links[i].target : links[i]
.target + ':' + links[i].source;
links[i].size = linkmap[key];
//同一组的关系进行编号
var group = linkGroup[key];
//给节点分配编号
setLinkNumber(group);
}
//节点
var nodes = {};
//关系对应颜色
var relationColor = {};
for (var i = 0; i < links.length; i++) {
links[i].source = nodes[links[i].source] || (nodes[links[i].source] = {
name: links[i].source,
color: links[i].sourceColor,
image: links[i].sourceImg,
radius: links[i].sourceRadius
});
links[i].target = nodes[links[i].target] || (nodes[links[i].target] = {
name: links[i].target,
color: links[i].targetColor,
image: links[i].targetImg,
radius: links[i].targetRadius
});
}
var sourceData = datas.links;
for (var i = 0; i < sourceData.length; i++) {
relationColor[sourceData[i].relation] = {
"relation": sourceData[i].relation,
"lineColor": sourceData[i].lineColor
};
}
nodes = d3.values(nodes);
relationColor = d3.values(relationColor);
var examples_x = parseFloat(options.examplesX); //关系示例坐标x
var examples_y = parseFloat(options.examplesY); //关系示例坐标y
var examplesLength = 80;
var examplesSize = Math.floor((width - examples_x) / examplesLength);
var examplesRow = relationColor.length % examplesSize == 0 ? relationColor.length / examplesSize : Math
.ceil(relationColor.length / examplesSize);
//计算关系示列位置
for (var i = 1; i <= relationColor.length; i++) {
var num = i % examplesSize == 0 ? examplesSize : i % examplesSize;
relationColor[i - 1].x = examples_x + (num - 1) * examplesLength;
relationColor[i - 1].y = examples_y + 20 * Math.ceil(i / examplesSize);
}
if (dataFilter == undefined) {
dataFilter = [];
for (var i = 0; i < relationColor.length; i++) {
dataFilter.push({
"relation": relationColor[i].relation,
"isShow": "true"
});
}
}
//绑定相连节点
for (var i = 0; i < nodes.length; i++) {
for (var j = 0; j < links.length; j++) {
if (nodes[i].name == links[j].source.name) {
nodes[i][links[j].target.name] = {
name: links[j].target.name
};
}
if (nodes[i].name == links[j].target.name) {
nodes[i][links[j].source.name] = {
name: links[j].source.name
};
}
}
}
//D3力导向布局
var force = d3.layout.force()
.nodes(nodes)
.links(links)
.size([width, height])
.linkDistance(200)
.charge(-1500)
.start();
// 全图缩放器
var zoom = d3.behavior.zoom()
.scaleExtent([0.25, 2])
.on('zoom', zoomFn);
var svg = d3.select("#" + divid).append("svg")
.attr("width", width)
.attr("height", height)
.attr("style", "background-color:" + backgroundColor)
.call(zoom)
.on('dblclick.zoom', null);
// 缩放层（位置必须在 container 之前）
var zoomOverlay = svg.append('rect')
.attr('width', width)
.attr('height', height)
.style('fill', 'none')
.style('pointer-events', 'all');
var container = svg.append('g')
.attr('transform', 'scale(' + 0.6 + ')')
.attr('class', 'container');
// 根据分类进行筛选
if (options.showExamples) {
var examples = svg.selectAll(".examples")
.data(relationColor)
.enter()
.append("svg:g")
.attr("fill-opacity", function (d) {
for (var i = 0; i < dataFilter.length; i++) {
if (d.relation == dataFilter[i].relation && dataFilter[i].isShow == "false") {
return 0.2;
}
}
return 1;
})
.on("click", function (d) {
for (var i = 0; i < dataFilter.length; i++) {
if (dataFilter[i].relation == d.relation) {
if (dataFilter[i].isShow == "true") {
dataFilter[i].isShow = "false";
} else {
dataFilter[i].isShow = "true";
}
}
}
drawChart(divid, options, datas, dataFilter);
});
examples.append("svg:path")
.attr("d", function (d) {
var x1 = d.x;
var y1 = d.y;
var x2 = x1 + 20;
var y2 = y1;
return 'M' + x1 + ' ' + y1 + ' L ' + x2 + ' ' + y2;
})
.style("stroke", function (d) {
if (d.lineColor == "") {
return lineColor;
} else {
return d.lineColor;
}
})
.style("stroke-width", 2.5);
examples.append("svg:text")
.style("font-size", "14px")
.style("fill", examplesFontColor)
.attr("x", function (d) {
if (d.relation.length > 3) {
return d.x + 20 + 14 * 4 / 2;
}
return d.x + 20 + 14 * d.relation.length / 2;
})
.attr("y", function (d) {
return d.y + 5;
})
.attr('text-anchor', "middle")
.text(function (d) {
if (d.relation.length > 3) {
return d.relation.substring(0, 3) + "...";
}
return d.relation;
})
.on("mouseover", function (d) {
console.log('放到分类上');
tooltip.html("<span>" + d.relation + "</span>")
.style("left", (d3.event.pageX) + "px")
.style("top", (d3.event.pageY + 20) + "px")
.style("display", "block")
.style("position", "absolute")
.style("opacity", 1.0);
})
.on("mouseout", function (d, i) {
tooltip.style("opacity", 0.0);
});
}
function zoomFn() {
console.log('开始移动了');
const {
translate,
scale
} = d3.event;
console.log(container);
container.attr('transform', 'translate(' + translate + ')scale(' + scale * 0.6 + ')');
}
//设置连接线
var edges_path = container.selectAll(".edgepath")
.data(links)
.enter()
.append("path")
.attr("marker-end", function (d, i) {
var arrowMarker = container.append("marker")
.attr("id", "arrow" + i)
.attr("markerUnits", "userSpaceOnUse")
.attr("markerWidth", "16")
.attr("markerHeight", "15")
.attr("viewBox", "0 0 12 12")
.attr("refX", 9)
.attr("refY", 6)
.attr("orient", "auto")
.append("svg:path")
.attr("d", "M2,2 L10,6 L2,10 L6,6 L2,2")
.attr("fill", function () {
return d.lineColor = "" ? lineColor : d.lineColor;
});
return "url(#arrow" + i + ")";
})
.style("stroke", function (d) {
if (d.lineColor == "") {
return lineColor;
} else {
return d.lineColor;
}
})
.style("stroke-width", 1.5)
.on("mouseover", function (d) {
console.log('放到连接线');
// 设置参股或是融资信息
if (d.data) {
tooltip.html("<span>" + '融资额:' + d.data.rzs + "</span>")
.style("left", (d3.event.pageX) + "px")
.style("top", (d3.event.pageY + 20) + "px")
.style("display", "block")
.style("opacity", 1.0);
}
//影藏其它连线上文字
edges_text.style("fill-opacity", function (edge) {
if (edge === d) {
return 1;
}
return 0;
})
edges_path.style("stroke-width", function (edge) {
if (edge === d) {
return 4;
}
return 1.5;
})
})
.on("mouseout", function (d, i) {
//显示连线上的文字
edges_text.style("fill-opacity", 1);
edges_path.style("stroke-width", 1.5);
// 隐藏提示信息
tooltip.style("opacity", 0.0);
});
//边上的文字（人物之间的关系），连接线
var edges_text = container.selectAll(".linetext")
.data(links)
.enter()
.append("svg:g")
.attr("class", "linetext")
.attr("fill-opacity", 1);
edges_text.append("svg:text")
.style("font-size", (12 + "px"))
.style("font-family", lineFontType)
.style("fill", "#000000")
.attr("y", ".33em")
.attr('text-anchor', "middle")
.text(function (d) {
return d.relation;
});
edges_text.insert('rect', 'text')
.attr('width', function (d) {
return d.relation.length * lineFontSize;
})
.attr('height', function (d) {
return lineFontSize;
})
.attr("y", "-.6em")
.attr('x', function (d) {
return -d.relation.length * lineFontSize / 2;
})
.style('fill', 'none');
// 节点设置，包含圆形图片节点（人物头像）
var circle = container.selectAll("circle")
.data(nodes)
.enter()
.append("circle")
.style("stroke", function (d) {
if (d.color == "") {
return "#EE8262";
} else if (d.color == '#0084ff') {
return '#0077c6'
} else if (d.color == '#F4793B') {
return '#FC3620'
}
return d.color;
})
.style("stroke-width", "2px")
.attr("r", function (d) {
return d.radius;
})
.attr("fill", function (d, i) {
//节点图片不为空是添加背景色
if (d.image == "") {
if (d.color == "") {
return "#EE8262";
}
return d.color;
} else {
//创建圆形图片
var defs = container.append("defs").attr("id", "imgdefs")
var catpattern = defs.append("pattern")
.attr("id", "catpattern" + i)
.attr("height", 1)
.attr("width", 1)
catpattern.append("image")
/* .attr("x", - (img_w / 2 - radius))
.attr("y", - (img_h / 2 - radius)) */
.attr("width", d.radius * 2)
.attr("height", d.radius * 2)
.attr("xlink:href", d.image)
return "url(#catpattern" + i + ")";
}
})
.on("mouseover", function (d, i) {
console.log('放到人物头像');
//影藏其它连线上文字
edges_text.style("fill-opacity", function (edge) {
if (edge.source === d || edge.target === d) {
return 1;
}
if (edge.source !== d && edge.target !== d) {
return 0;
}
})
//其它节点亮度调低
circle.style("opacity", function (edge) {
var v = d.name;
if (edge.name == v || (edge[v] != undefined && edge[v].name == v)) {
return 1;
} else {
return 0.2;
}
})
//其他连先亮度调低
edges_path.style("opacity", function (edge) {
if (edge.source === d || edge.target === d) {
return 1;
}
if (edge.source !== d && edge.target !== d) {
return 0.2;
}
})
//其他节点文字亮度调低
nodes_text.style("opacity", function (edge) {
var v = d.name;
if (edge.name == v || (edge[v] != undefined && edge[v].name == v)) {
return 1;
} else {
return 0.2;
}
})
})
.on("mouseout", function (d, i) {
//显示连线上的文字
edges_text.style("fill-opacity", 1);
edges_path.style("opacity", 1);
circle.style("opacity", 1);
nodes_text.style("opacity", 1);
tooltip.style("opacity", 0.0);
})
.call(force.drag);
var tooltip = d3.select("body").append("div")
.attr("class", "tooltip")
.attr("opacity", 0.0);
// 节点文字设置
var nodes_text = container.selectAll(".nodetext")
.data(nodes)
.enter()
.append("text")
.style("font-size", (nodesFontSize + "px"))
.style("fill", "#ffffff")
.style("font-family", nodesFontType)
.attr('x', function (d) {
var name = d.name;
//如果小于四个字符，不换行
if (name.length < 4) {
d3.select(this).append('tspan')
.attr("dx", -nodesFontSize * (name.length / 2))
.attr("dy", 5)
.text(function () {
return name;
});
} else if (name.length >= 4 && name.length <= 6) {
var top = d.name.substring(0, 3);
var bot = d.name.substring(3, name.length);
d3.select(this).append('tspan')
.attr("dx", -nodesFontSize * 1.5)
.attr("dy", -nodesFontSize * 0.5)
.text(function () {
return top;
});
d3.select(this).append('tspan')
.attr("dx", -(nodesFontSize * name.length / 2))
.attr("dy", nodesFontSize)
.text(function () {
return bot;
});
} else if (name.length > 7) {
var top = d.name.substring(0, 3);
var mid = d.name.substring(3, 6);
var bot = d.name.substring(6, name.length);
d3.select(this).append('tspan')
.attr("dx", -nodesFontSize * 1.5)
.attr("dy", -nodesFontSize * 0.5)
.text(function () {
return top;
});
d3.select(this).append('tspan')
.attr("dx", -nodesFontSize * 3)
.attr("dy", nodesFontSize)
.text(function () {
return mid;
});
d3.select(this).append('tspan')
.attr("dx", -nodesFontSize * 2)
.attr("dy", nodesFontSize)
.text(function () {
return "...";
});
}
})
.on("mouseover", function (d, i) {
console.log('放到关系文字');
//影藏其它连线上文字
edges_text.style("fill-opacity", function (edge) {
if (edge.source === d || edge.target === d) {
return 1;
}
if (edge.source !== d && edge.target !== d) {
return 0;
}
})
//其他节点亮度调低
circle.style("opacity", function (edge) {
var v = d.name;
if (edge.name == v || (edge[v] != undefined && edge[v].name == v)) {
return 1;
} else {
return 0.2;
}
})
//其他连线亮度调低
edges_path.style("opacity", function (edge) {
if (edge.source === d || edge.target === d) {
return 1;
}
if (edge.source !== d && edge.target !== d) {
return 0.2;
}
})
//其他节点文字亮度调低
nodes_text.style("opacity", function (edge) {
var v = d.name;
if (edge.name == v || (edge[v] != undefined && edge[v].name == v)) {
return 1;
} else {
return 0.2;
}
})
tooltip.html("<span>" + d.name + "</span>")
.style("left", (d3.event.pageX) + "px")
.style("top", (d3.event.pageY + 20) + "px")
.style("display", "block")
.style("opacity", 1.0);
})
.on("mouseout", function (d, i) {
//显示连线上的文字
edges_text.style("fill-opacity", 1);
edges_path.style("opacity", 1);
circle.style("opacity", 1);
nodes_text.style("opacity", 1);
tooltip.style("opacity", 0.0);
})
.call(force.drag);
// 拖动节点
var drag = force.drag()
.on("dragstart", function (d, i) {
d.fixed = true; //拖拽开始后设定被拖拽对象为固定
d3.event.sourceEvent.stopPropagation();
})
.on("dragend", function (d, i) {})
.on("drag", function (d, i) {});
//力学图运动开始时
force.on("start", function () {});
//力学图运动结束时
force.on("end", function () {});
force.on("tick", function () {
edges_path.attr("d", function (d) {
var tan = Math.abs((d.target.y - d.source.y) / (d.target.x - d.source
.x)); //圆心连线tan值
var x1 = d.target.x - d.source.x > 0 ? Math.sqrt(d.sourceRadius * d.sourceRadius / (
tan * tan + 1)) + d.source.x :
d.source.x - Math.sqrt(d.sourceRadius * d.sourceRadius / (tan * tan +
1)); //起点x坐标
var y1 = d.target.y - d.source.y > 0 ? Math.sqrt(d.sourceRadius * d.sourceRadius *
tan * tan / (tan * tan + 1)) + d.source.y :
d.source.y - Math.sqrt(d.sourceRadius * d.sourceRadius * tan * tan / (tan *
tan + 1)); //起点y坐标
var x2 = d.target.x - d.source.x > 0 ? d.target.x - Math.sqrt(d.targetRadius * d
.targetRadius / (1 + tan * tan)) :
d.target.x + Math.sqrt(d.targetRadius * d.targetRadius / (1 + tan *
tan)); //终点x坐标
var y2 = d.target.y - d.source.y > 0 ? d.target.y - Math.sqrt(d.targetRadius * d
.targetRadius * tan * tan / (1 + tan * tan)) :
d.target.y + Math.sqrt(d.targetRadius * d.targetRadius * tan * tan / (1 + tan *
tan)); //终点y坐标
if (d.target.x - d.source.x == 0 || tan == 0) { //斜率无穷大的情况或为0时
y1 = d.target.y - d.source.y > 0 ? d.source.y + d.sourceRadius : d.source.y - d
.sourceRadius;
y2 = d.target.y - d.source.y > 0 ? d.target.y - d.targetRadius : d.target.y + d
.targetRadius;
}
// 防报错
if (!x1 || !y1 || !x2 || !y2) {
return
}
if (d.linknum == 0) { //设置编号为0的连接线为直线，其他连接线会均分在两边
d.x_start = x1;
d.y_start = y1;
d.x_end = x2;
d.y_end = y2;
return 'M' + x1 + ' ' + y1 + ' L ' + x2 + ' ' + y2;
}
var a = d.sourceRadius > d.targetRadius ? d.targetRadius * d.linknum / 3 : d
.sourceRadius * d.linknum / 3;
var xm = d.target.x - d.source.x > 0 ? d.source.x + Math.sqrt((d.sourceRadius * d
.sourceRadius - a * a) / (1 + tan * tan)) :
d.source.x - Math.sqrt((d.sourceRadius * d.sourceRadius - a * a) / (1 + tan *
tan));
var ym = d.target.y - d.source.y > 0 ? d.source.y + Math.sqrt((d.sourceRadius * d
.sourceRadius - a * a) * tan * tan / (1 + tan * tan)) :
d.source.y - Math.sqrt((d.sourceRadius * d.sourceRadius - a * a) * tan * tan / (
1 + tan * tan));
var xn = d.target.x - d.source.x > 0 ? d.target.x - Math.sqrt((d.targetRadius * d
.targetRadius - a * a) / (1 + tan * tan)) :
d.target.x + Math.sqrt((d.targetRadius * d.targetRadius - a * a) / (1 + tan *
tan));
var yn = d.target.y - d.source.y > 0 ? d.target.y - Math.sqrt((d.targetRadius * d
.targetRadius - a * a) * tan * tan / (1 + tan * tan)) :
d.target.y + Math.sqrt((d.targetRadius * d.targetRadius - a * a) * tan * tan / (
1 + tan * tan));
if (d.target.x - d.source.x == 0 || tan == 0) { //斜率无穷大或为0时
ym = d.target.y - d.source.y > 0 ? d.source.y + Math.sqrt(d.sourceRadius * d
.sourceRadius - a * a) : d.source.y - Math.sqrt(d.sourceRadius * d
.sourceRadius - a * a);
yn = d.target.y - d.source.y > 0 ? d.target.y - Math.sqrt(d.targetRadius * d
.targetRadius - a * a) : d.target.y + Math.sqrt(d.targetRadius * d
.targetRadius - a * a);
}
var k = (x1 - x2) / (y2 - y1); //连线垂线的斜率
var dx = Math.sqrt(a * a / (1 + k * k)); //相对垂点x轴距离
var dy = Math.sqrt(a * a * k * k / (1 + k * k)); //相对垂点y轴距离
if ((y2 - y1) == 0) {
dx = 0;
dy = Math.sqrt(a * a);
}
if (a > 0) {
var xs = k > 0 ? xm - dx : xm + dx;
var ys = ym - dy;
var xt = k > 0 ? xn - dx : xn + dx;
var yt = yn - dy;
} else {
var xs = k > 0 ? xm + dx : xm - dx;
var ys = ym + dy;
var xt = k > 0 ? xn + dx : xn - dx;
var yt = yn + dy;
}
//记录连线起始和终止坐标，用于定位线上文字
d.x_start = xs;
d.y_start = ys;
d.x_end = xt;
d.y_end = yt;
return 'M' + xs + ' ' + ys + ' L ' + xt + ' ' + yt;
});
//更新连接线上文字的位置
edges_text.attr("transform", function (d) {
// 防止报错
if (!d.x_start || !d.y_start || !d.x_end || !d.y_end) {
return
}
return "translate(" + (d.x_start + d.x_end) / 2 + "," + ((+d.y_start) + (+d
.y_end)) / 2 +
")" + " rotate(" + Math.atan((d.y_end - d.y_start) / (d.x_end - d.x_start)) *
180 / Math.PI + ")";
});
//更新结点图片和文字
circle.attr("cx", function (d) {
return d.x
});
circle.attr("cy", function (d) {
return d.y
});
nodes_text.attr("x", function (d) {
return d.x
});
nodes_text.attr("y", function (d) {
return d.y
});
});
}
// 分配編號
function setLinkNumber(group) {
if (group.length == 0) return;
if (group.length == 1) {
group[0].linknum = 0;
return;
}
var maxLinkNumber = group.length % 2 == 0 ? group.length / 2 : (group.length - 1) / 2;
if (group.length % 2 == 0) {
var startLinkNum = -maxLinkNumber + 0.5;
for (var i = 0; i < group.length; i++) {
group[i].linknum = startLinkNum++;
}
} else {
var startLinkNum = -maxLinkNumber;
for (var i = 0; i < group.length; i++) {
group[i].linknum = startLinkNum++;
}
}
}
</script>
</html>
