d3.js——图形拖拽操作

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我是靠谱客的博主兴奋花生，这篇文章主要介绍d3.js——图形拖拽操作，现在分享给大家，希望可以做个参考。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>拖拽操作</title>
</head>
<body>
<script src = "d3.js"></script>
<script>
    var width =2000,
            height = 2000;
    var svg = d3.select("body").append("svg")
            .attr("width",width)
            .attr("height",height)
    var color = d3.scale.category20()
    //定义拖拽函数
    var drag = d3.behavior.drag()
            .on("drag",dragmove)
    function dragmove(d){
        d3.select(this)
                .attr("cx", d.cx = d3.event.x)
                .attr("cy", d.cy = d3.event.y)
    }

    //绘制圆形
    var circles =[{cx:150,cy:200,r:30},
        {cx:250,cy:200,r:30}]
    svg.selectAll("circle")
            .data(circles)
            .enter()
            .append("circle