本文实例为大家分享了d3.js图形拖拽的具体代码，供大家参考，具体内容如下
<!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")
.attr("cx",function(d){return d.cx})
.attr("cy",function(d){return d.cy})
.attr("r", function (d) {
return d.r
})
.attr("fill",color)
.call(drag)
</script>
</body>
</html>
