【D3.js数据可视化系列教程】（三十）--力导向图之带文字
(1)链接数组
var links = [
{source: "Microsoft", target: "Amazon", type: "licensing" ,weight:1,color:1},
{source: "Microsoft", target: "HTC", type: "licensing" ,weight:3,color:4},
{source: "Samsung", target: "Apple", type: "suit" ,weight:4,color:6},
{source: "Motorola", target: "Apple", type: "suit" ,weight:6,color:65},
{source: "Nokia", target: "Apple", type: "resolved" ,weight:3,color:76},
{source: "HTC", target: "Apple", type: "suit" ,weight:8,color:879},
{source: "Kodak", target: "Apple", type: "suit" ,weight:7,color:989},
{source: "Microsoft", target: "Barnes & Noble", type: "suit" ,weight:9,color:643},
{source: "Microsoft", target: "Foxconn", type: "suit" ,weight:1,color:54},
{source: "Oracle", target: "Google", type: "suit" ,weight:3,color:54},
{source: "Apple", target: "HTC", type: "suit" ,weight:4,color:45},
{source: "Microsoft", target: "Inventec", type: "suit" ,weight:0,color:43},
{source: "Samsung", target: "Kodak", type: "resolved" ,weight:8,color:243},
{source: "LG", target: "Kodak", type: "resolved" ,weight:1,color:43},
{source: "RIM", target: "Kodak", type: "suit" ,weight:5,color:13},
{source: "Sony", target: "LG", type: "suit" ,weight:3,color:351},
{source: "Kodak", target: "LG", type: "resolved" ,weight:4,color:1},
{source: "Apple", target: "Nokia", type: "resolved" ,weight:1,color:1},
{source: "Qualcomm", target: "Nokia", type: "resolved" ,weight:3,color:4},
{source: "Apple", target: "Motorola", type: "suit" ,weight:4,color:6},
{source: "Microsoft", target: "Motorola", type: "suit" ,weight:6,color:65},
{source: "Motorola", target: "Microsoft", type: "suit" ,weight:3,color:76},
{source: "Huawei", target: "ZTE", type: "suit" ,weight:8,color:879},
{source: "Ericsson", target: "ZTE", type: "suit" ,weight:7,color:989},
{source: "Kodak", target: "Samsung", type: "resolved" ,weight:9,color:643},
{source: "Apple", target: "Samsung", type: "suit" ,weight:1,color:54},
{source: "Kodak", target: "RIM", type: "suit" ,weight:3,color:54},
{source: "Nokia", target: "Qualcomm", type: "suit" ,weight:4,color:45}
];
var nodes = {};
(2)从链接中分离出不同的节点
links.forEach(function(link) { //思路就是：在连接中遍历链接，节点数组有了这个链接的源节点就把链接指向这个节点。没有的话把链接上的节点加到链接数组指定名称name属性，并把链接指向这个节点
console.log(nodes);
link.source = nodes[link.source] //link.sourc就是节点值比如Apple
|| (nodes[link.source] = {name: link.source});//(填加节点数据)
link.target = nodes[link.target] || (nodes[link.target] = {name: link.target});
});
//(3)为链接添加线
var link = svg.selectAll(".link")
.data(force.links())
.enter().append("line")
.attr("class", "link");
var colors=d3.scale.category20();
link.style("stroke",function(d){// 设置线的颜色
return colors(d.color);
})
.style("stroke-width",function(d,i){//设置线的宽度
return d.weight;
});
(4)为链接添加节点
var node = svg.selectAll(".node")
.data(force.nodes())
.enter().append("g")
.attr("class", "node")
.on("mouseover", mouseover)
.on("mouseout", mouseout)
.call(force.drag);
//设置圆点的半径，圆点的度越大weight属性值越大，可以对其做一点数学变换
function radius (d){
if(!d.weight){//节点weight属性没有值初始化为1（一般就是叶子了）
d.weight=1;
}
return Math.log(d.weight)*10;
}
node.append("circle")
.attr("r",function(d){ //设置圆点半径
return radius (d);
})
.style("fill",function(d){ //设置圆点的颜色
return colors(d.weight*d.weight*d.weight);
}) ;
node.append("text")
.attr("x", 12)
.attr("dy", ".35em")
.text(function(d) { return d.name; });
function tick() {//打点更新坐标
link
.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d) { return d.target.y; });
node
.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
}
function mouseover() {
d3.select(this).select("circle").transition()
.duration(750)
.attr("r", function(d){ //设置圆点半径
return radius (d)+10;
}) ;
}
function mouseout() {
d3.select(this).select("circle").transition()
.duration(750)
.attr("r", function(d){ //恢复圆点半径
return radius (d);
}) ;
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>testD3-27-textforce.html</title>
<script type="text/javascript" src="http://localhost:8080/spring/js/d3.v3.js"></script>
<style type="text/css">
</style>
</head>
<body>
<script type="text/javascript">
//(1)链接数组
var links = [
{source: "Microsoft", target: "Amazon", type: "licensing" ,weight:1,color:1},
{source: "Microsoft", target: "HTC", type: "licensing" ,weight:3,color:4},
{source: "Samsung", target: "Apple", type: "suit" ,weight:4,color:6},
{source: "Motorola", target: "Apple", type: "suit" ,weight:6,color:65},
{source: "Nokia", target: "Apple", type: "resolved" ,weight:3,color:76},
{source: "HTC", target: "Apple", type: "suit" ,weight:8,color:879},
{source: "Kodak", target: "Apple", type: "suit" ,weight:7,color:989},
{source: "Microsoft", target: "Barnes & Noble", type: "suit" ,weight:9,color:643},
{source: "Microsoft", target: "Foxconn", type: "suit" ,weight:1,color:54},
{source: "Oracle", target: "Google", type: "suit" ,weight:3,color:54},
{source: "Apple", target: "HTC", type: "suit" ,weight:4,color:45},
{source: "Microsoft", target: "Inventec", type: "suit" ,weight:0,color:43},
{source: "Samsung", target: "Kodak", type: "resolved" ,weight:8,color:243},
{source: "LG", target: "Kodak", type: "resolved" ,weight:1,color:43},
{source: "RIM", target: "Kodak", type: "suit" ,weight:5,color:13},
{source: "Sony", target: "LG", type: "suit" ,weight:3,color:351},
{source: "Kodak", target: "LG", type: "resolved" ,weight:4,color:1},
{source: "Apple", target: "Nokia", type: "resolved" ,weight:1,color:1},
{source: "Qualcomm", target: "Nokia", type: "resolved" ,weight:3,color:4},
{source: "Apple", target: "Motorola", type: "suit" ,weight:4,color:6},
{source: "Microsoft", target: "Motorola", type: "suit" ,weight:6,color:65},
{source: "Motorola", target: "Microsoft", type: "suit" ,weight:3,color:76},
{source: "Huawei", target: "ZTE", type: "suit" ,weight:8,color:879},
{source: "Ericsson", target: "ZTE", type: "suit" ,weight:7,color:989},
{source: "Kodak", target: "Samsung", type: "resolved" ,weight:9,color:643},
{source: "Apple", target: "Samsung", type: "suit" ,weight:1,color:54},
{source: "Kodak", target: "RIM", type: "suit" ,weight:3,color:54},
{source: "Nokia", target: "Qualcomm", type: "suit" ,weight:4,color:45}
];
var nodes = {};
//(2)从链接中分离出不同的节点
//一个小问题：节点的weight属性怎么产生的？
links.forEach(function(link) { //思路就是：在连接中遍历链接，节点数组有了这个链接的源节点就把链接指向这个节点。没有的话把链接上的节点加到链接数组指定名称name属性，并把链接指向这个节点
console.log(nodes);
link.source = nodes[link.source] //link.sourc就是节点值比如Apple
|| (nodes[link.source] = {name: link.source});//(填加节点数据)
link.target = nodes[link.target] || (nodes[link.target] = {name: link.target});
});
var width = 960,
height = 500;
var force = d3.layout.force()
.nodes(d3.values(nodes))
.links(links)
.size([width, height])
.linkDistance(60)
.charge(-300)
.on("tick", tick)
.start();
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
//(3)为链接添加线
var link = svg.selectAll(".link")
.data(force.links())
.enter().append("line")
.attr("class", "link");
var colors=d3.scale.category20();
link.style("stroke",function(d){// 设置线的颜色
return colors(d.color);
})
.style("stroke-width",function(d,i){//设置线的宽度
return d.weight;
});
//(4)为链接添加节点
var node = svg.selectAll(".node")
.data(force.nodes())
.enter().append("g")
.attr("class", "node")
.on("mouseover", mouseover)
.on("mouseout", mouseout)
.call(force.drag);
//设置圆点的半径，圆点的度越大weight属性值越大，可以对其做一点数学变换
function radius (d){
if(!d.weight){//节点weight属性没有值初始化为1（一般就是叶子了）
d.weight=1;
}
return Math.log(d.weight)*10;
}
node.append("circle")
.attr("r",function(d){ //设置圆点半径
return radius (d);
})
.style("fill",function(d){ //设置圆点的颜色
return colors(d.weight*d.weight*d.weight);
}) ;
node.append("text")
.attr("x", 12)
.attr("dy", ".35em")
.text(function(d) { return d.name; });
function tick() {//打点更新坐标
link
.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d) { return d.target.y; });
node
.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
}
function mouseover() {
d3.select(this).select("circle").transition()
.duration(750)
.attr("r", function(d){ //设置圆点半径
return radius (d)+10;
}) ;
}
function mouseout() {
d3.select(this).select("circle").transition()
.duration(750)
.attr("r", function(d){ //恢复圆点半径
return radius (d);
}) ;
}
</script>
</body>
</html>