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day3.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<svg id="svgContainer" width="600" height="400"></svg>
</body>
</html>
<script src="https://d3js.org/d3.v5.min.js"></script>
<script>
// 假设节点数据为一个数组，每个节点具有x和y坐标属性
var nodes = [
{ x: 50, y: 50 },
{ x: 150, y: 150 },
{ x: 250, y: 250 }
];
// 选择SVG容器
var svg = d3.select("#svgContainer");
// 为每个节点创建圆形元素
var circle = svg.selectAll("circle")
.data(nodes)
.enter()
.append("circle")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", 20)
.style("fill", "blue");
// 创建一个拖拽行为
var drag = d3.drag()
.on("start", dragStart)
.on("drag", dragging)
.on("end", dragEnd);
// 为每个节点应用拖拽行为
circle.call(drag);
// 拖拽行为的回调函数
function dragStart(event, d) {
// 在拖拽开始时保存节点原始的坐标位置
console.log('dragStart',event,d)
d.x0 = event.x;
d.y0 = event.y;
}
function dragging(event, d) {
// 更新节点的坐标位置
console.log('dragging',event,d)
d.x = event.x;
d.y = event.y;
// 更新节点元素的位置
d3.select(this)
.attr("cx", d.x)
.attr("cy", d.y);
}
function dragEnd(event, d) {
console.log('dragEnd',event,d)
// 拖拽结束后的操作，如果需要的话
d.x = event.x;
d.y = event.y;
d3.select(this)
.attr("cx", d.x)
.attr("cy", d.y);
}
//
</script>