caojunfei
/
stest


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202
							<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>画一个树图(Tree)</title>
</head>
<style>

    .node circle {
        stroke: steelblue;
        stroke-width: 1px;
        cursor:pointer;
    }

    .node {
        font: 12px sans-serif;
        display:block;
    }

    .hidenode {
        font: 12px sans-serif;
        display:none;
    }

    .link {
        fill: none;
        stroke: #ccc;
        stroke-width: 1px;
    }

</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script type="text/javascript">

    //图像区域大小
    var R = 600;
    //动画持续时间
    var duration=1000;
    //节点编号
    var index=0;

    //定义一个Tree对象,定义旋转角度和最大半径
    var tree = d3.layout.tree()
        .size([360,R/2-120])
        .separation(function(a,b) { return (a.parent == b.parent ? 1 : 2)/a.depth;});

    //定义布局方向
    var diagonal = d3.svg.diagonal()
        .projection(function(d) {
            var r = d.y, a = (d.x-90) / 180 * Math.PI;
            return [r * Math.cos(a), r * Math.sin(a)];
        });

    //新建画布，移动到圆心位置
    var svg = d3.select("body").append("svg")
        .attr("width", R)
        .attr("height", R)
        .append("g")
        .attr("transform", function(d){ return "translate("+R/2+"," + R/2 + ")";});

    //根据JSON数据生成树
    d3.json("d5.json", function(error, data) {

        var root=data;

        //根据数据生成nodes集合
        var nodes = tree.nodes(data);

        //记录现在的位置
        nodes.forEach(function(d){
            d.x0 = d.x;
            d.y0 = d.y;
        });

        //获取node集合的关系集合
        var links = tree.links(nodes);

        //根据node集合生成节点,添加id是为了区分是否冗余的节点
        var node = svg.selectAll(".node")
            .data(nodes,function(d){return d.id|| (d.id = ++index);});

        //为关系集合设置贝塞尔曲线连接
        var link=svg.selectAll(".link")
            .data(links, function(d) { return d.target.id;})
            .enter()
            .append("path")
            .attr("class", "link")
            .attr("d",diagonal);

        node.enter()
            .append("g")
            .attr("class", "node")
            .attr("transform",function(d){return "rotate(" + (d.x-90) + ")translate(" + d.y + ")"; })
            .on("click",nodeClick);

        //为节点添加圆形标记,如果有子节点为红色，否则绿色
        node.append("circle")
            .attr("fill",function(d){return d.children==null?"#0F0":"#F00";})
            .attr("r", 5);

        //为节点添加说明文字
        node.append("text")
            .attr("dy", ".4em")
            .text(function(d){return d.level;})
            .attr("text-anchor", function(d) { return d.x < 180 ? "start" : "end"; })
            .attr("transform", function(d) { return d.x < 180 ? "translate(8)" : "rotate(180)translate(-8)"; });

        //点击的话，隐藏或者显示子节点
        function nodeClick(d)
        {
            if (d.children)
            {
                d._children = d.children;
                d.children = null;
            }
            else
            {
                d.children = d._children;
                d._children = null;
            }
            update(d);
        }

        //更新显示
        function update(source)
        {
            //取得现有的节点数据,因为设置了Children属性，没有Children的节点将被删除
            var nodes = tree.nodes(root).reverse();
            var links = tree.links(nodes);

            //为节点更新数据
            var node = svg.selectAll("g.node")
                .data(nodes,function(d){return d.id|| (d.id = ++index);});

            //为链接更新数据
            var link = svg.selectAll("path.link").data(links, function(d) {return d.target.id;});

            //更新链接
            link.enter()
                .append("path")
                .attr("class", "link")
                .attr("d", function(d) {
                    var o = {x: source.x, y: source.y};
                    return diagonal({source: o, target: o});
                });

            link.transition()
                .duration(duration)
                .attr("d",diagonal);

            //移除无用的链接
            link.exit()
                .transition()
                .duration(duration)
                .attr("d", function(d) {
                    var o = {x: source.x, y: source.y};
                    return diagonal({source: o, target: o});
                })
                .remove();

            //更新节点集合
            var nodeEnter = node.enter()
                .append("g")
                .attr("class", "node")
                .attr("transform",function(d){return "rotate(" + (source.x0-90) + ")translate(" + source.y0 + ")"; })
                .on("click",nodeClick);

            //为节点添加圆形标记,如果有子节点为红色，否则绿色
            node.append("circle")
                .attr("fill",function(d){return d.children==null && d._children==null?"#0F0":"#F00";})
                .attr("r", 5);

            //为节点添加说明文字
            node.append("text")
                .attr("dy", ".4em")
                .text(function(d){return d.level;})
                .attr("text-anchor", function(d) { return d.x < 180 ? "start" : "end"; })
                .attr("transform", function(d) { return d.x < 180 ? "translate(8)" : "rotate(180)translate(-8)"; });

            //节点动画
            var nodeUpdate = node.transition()
                .duration(duration)
                .attr("transform", function(d) { return "rotate(" + (d.x-90) + ")translate(" + d.y + ")"; });

            //将无用的子节点删除
            var nodeExit =node.exit()
                .transition()
                .duration(duration)
                .attr("transform", function(d){return "rotate(" + (source.x-90) + ")translate(" + source.y + ")"; })
                .remove();

            //记录下当前位置,为下次动画记录初始值
            nodes.forEach(function(d) {
                d.x0 = d.x;
                d.y0 = d.y;
            });
        }
    });
</script>
</body>
</html>