SVG--D3--血缘关系树

最近的工作与可视化有关，有展示血缘关系树的需求 ，类似于这样：

碰巧搜到 D3（用于可视化的js库，作者吕之华），瞬间无法自拔，它的树状图功能基于SVG、js ，暴露的可操作入口也简洁恰当，能帮助你快速完成svg开发。

D3的使用：  入门教程：http://wiki.jikexueyuan.com/project/d3wiki/author.html

开发笔记：

1. SVG DOM 与HTML DOM 不一样，属性、样式是不共用的，但也有相似之处

2. Svg中一段文本用<text>标签，如果要集中控制多个元素用<g>(group)标签

3. 钩子： 

nodeEnter  nodeUpdate  nodeExit

var flare = {
              "name": "前端应用",
              "children": [
                {
                  "name": "服务1",
                  "children": [
                    {
                      "name": "cluster",
                      "children": [
                        {"name": "AgglomerativeCluster", "size": 3938}
                      ]
                    },
                    {
                      "name": "graph",
                      "tablename" : "public.conf_hanzhi_pinyin",
                      "dataowner" :"hippopMan",
                      "datadeveloper":"hippopMan",
                      "url":"/biReport/report/aabbcc.html",
                      "children": [
                        {"name": "BetweennessCentrality", "size": 3534},
                        {"name": "LinkDistance", "size": 5731}
                      ]
                    },
                    {
                      "name": "optimization",
                      "children": [
                        {"name": "AspectRatioBanker", "size": 7074}
                      ]
                    }
                  ]
                },
                {
                  "name": "服务2",
                  "children": [
                    {"name": "Easing", "size": 17010},
                    {"name": "FunctionSequence", "size": 5842}
                  ]
                }
　　　　　　　　　　........
              ]
            };

　　

具体代码：

var margin = {top: 20, right: 120, bottom: 20, left: 120},
    width = 3200 - margin.right - margin.left,
    height = 1200 - margin.top - margin.bottom;

var i = 0,
    duration = 750,
    root;

var tree = d3.layout.tree()
    .size([height, width]);

var diagonal = d3.svg.diagonal()
    .projection(function(d) { return [d.y, d.x]; });

var svg = d3.select(".canvan").append("svg")
    .attr("width", width + margin.right + margin.left)
    .attr("height", height + margin.top + margin.bottom)
    .append("g")
    .attr("transform", "translate(" + 80 + "," + 20 + ")");


function collapse(d) {

    if (d.children) {
        d._children = d.children;
        d._children.forEach(collapse);
        d.openFlag = false;       //自定义属性
    }else{
        if(searchFlag){
            d.openFlag = false;
        }else{
            if(reportKey){
                d.openFlag = true;
            }

        }

    }
}

function update(source) {

    // Compute the new tree layout转换数据
    var nodes = tree.nodes(root).reverse(),
        links = tree.links(nodes);

    // Normalize for fixed-depth.
    nodes.forEach(function(d) { d.y = d.depth * 240; });

    // Update the nodes…
    var node = svg.selectAll("g.node")
        .data(nodes, function(d) { return d.id || (d.id = ++i); });

    // Enter any new nodes at the parent's previous position.
    var nodeEnter = node.enter().append("g")
        .attr("class", "node")
        .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; }); //css3属性 二维动画

    var htm = "<div class='infoBox'>123</div>";
    //写文字的变迁
    nodeEnter.append("circle")          //画圆
        .attr("x","0px")
        .attr("y", "10px")              //x,y代表坐标，注意在group元素中，坐标是指在该元素中的相对坐标
        .attr("cx","0px")
        .attr("cy", "0px")
        .attr("dy", ".35em")
        .attr("text-anchor", "middle")
        .style("fill-opacity", 1)         //透明度 显示隐藏用display(none,block)
        .style("fill", function (d) {    //填充颜色
            return d.openFlag ? "#fff":"#12a566"
        })
        .on("click", click)             //给元素添加事件
        .on("mouseover",hover);

    nodeEnter.append("text")          //text标签
        .attr("class", "tablename")
        .attr("x","0px")
        .attr("y", "15px")
        .attr("dy", ".35em")
        .attr("text-anchor", "middle")
        .attr("width","60")
        .attr("height","45")
        .text(function(d) { return "表名" + d.tablename; })  //文字
        .style("display",showTableName?"block":"none")
        .style("fill-opacity", 1e-6);
    ......
// Transition nodes to their new position.
    var nodeUpdate = node.transition()
        .duration(duration)
        .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });

    nodeUpdate.select("circle")
        .attr("r", 4.5)
        .style("fill", function(d) { return d.openFlag ? "#fff":"#12a566" });

    nodeUpdate.select("text")
        .style("fill-opacity", 1);

    // Transition exiting nodes to the parent's new position.
    var nodeExit = node.exit().transition()
        .duration(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);

    // Update the links…
    var link = svg.selectAll("path.link")
        .data(links, function(d) { return d.target.id; });

    // Enter any new links at the parent's previous position.
    link.enter().insert("path", "g")
        .attr("class", "link")
        .attr("d", function(d) {
            var o = {x: source.x0, y: source.y0};
            return diagonal({source: o, target: o});
        });

    // Transition links to their new position.
    link.transition()
        .duration(duration)
        .attr("d", diagonal);

    // Transition exiting nodes to the parent's new position.
    link.exit().transition()
        .duration(duration)
        .attr("d", function(d) {
            var o = {x: source.x, y: source.y};
            return diagonal({source: o, target: o});
        })
        .remove();

    // Stash the old positions for transition.
    nodes.forEach(function(d) {
        d.x0 = d.x;
        d.y0 = d.y;
    });
}

// Toggle children on click.
function click(d) {
    if(d.childHasShowed){//已经加载出child
        //收起 d.children 展开 d._children;
        if (d.children) {
            d._children = d.children;
            d.children = null;
            d.openFlag = false;
        } else {
            d.children = d._children;
            d._children = null;
            d.openFlag = true;
        }
        update(d);
    }else{

        //点击加载child
        getDepenInfo(d.tablename, true, true ,d);
        // d.children = obj.children;
        // update(d);
    }
}

function hover(d) {
    console.log("over")
}