【发布时间】：2021-10-25 09:49:57
【问题描述】：
我需要实现各种链接距离。我在力/模拟的初始化过程中添加了一个函数调用。不过，看起来设置被忽略了。我想添加另一个非常接近的节点，几乎没有一根头发可以放在它们之间。这甚至可能吗？
我注意到 stackoverflow 上有一个similar question 但这需要另一个插件，而且这个问题是 4 年前创建的。也许 vanilla d3.js 已经添加了该功能。
var graph = {
"nodes": [
{
"id": 0
},
{
"id": 1
},
{
"id": 2
},
{
"id": 3
}
],
"links": [
{
"source": 0,
"target": 1,
"distance": 0.1
},
{
"source": 0,
"target": 2,
"distance": 150
},
{
"source": 0,
"target": 3,
"distance": 20
}
]
}
var svg = d3.select("svg")
.attr("class", "canvas")
.attr("width", window.innerWidth)
.attr("height", window.innerHeight)
.call(d3.zoom().on("zoom", function (event) {
svg.attr("transform", event.transform)
}))
.append("g")
var linksContainer = svg.append("g").attr("class", linksContainer)
var nodesContainer = svg.append("g").attr("class", nodesContainer)
var sourceNode;
var force = d3.forceSimulation()
//.force("link", d3.forceLink().id(function (d) { return d.id }).distance(80))
.force("link", d3.forceLink().distance(linkDistance).strength(0.1))
.force("charge", d3.forceManyBody().strength(-100))
.force("center", d3.forceCenter(window.innerWidth / 2, window.innerHeight / 2))
.force("collision", d3.forceCollide().radius(90))
function linkDistance(d) {
console.log(d.distance)
return d.distance;
}
initialize()
function initialize() {
link = linksContainer.selectAll(".link")
.data(graph.links)
.join("line")
.attr("class", "link")
.style("stroke", "black")
.style("stroke-width", 1)
node = nodesContainer.selectAll(".node")
.data(graph.nodes, d => d.id)
.join("g")
.attr("class", "node")
.call(d3.drag()
.on("start", dragStarted)
.on("drag", dragged)
.on("end", dragEnded)
)
.on("click", addNode)
node.selectAll("circle")
.data(d => [d])
.join("circle")
.attr("r", 30)
.style("fill", "whitesmoke")
node.append("text")
.attr("dominant-baseline", "central")
.attr("text-anchor", "middle")
.attr("font-size", 15)
.attr("pointer-events", "none")
.text(function (d) {
return d.id
})
force
.nodes(graph.nodes)
.on("tick", ticked);
force
.force("link")
.links(graph.links)
}
function ticked() {
// update link positions
link
.attr("x1", function (d) {
return d.source.x;
})
.attr("y1", function (d) {
return d.source.y;
})
.attr("x2", function (d) {
return d.target.x;
})
.attr("y2", function (d) {
return d.target.y;
});
// update node positions
node
.attr("transform", function (d) {
return "translate(" + d.x + ", " + d.y + ")";
});
}
function dragStarted(event, d) {
if (!event.active) force.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
PosX = d.x
PosY = d.y
}
function dragged(event, d) {
d.fx = event.x;
d.fy = event.y;
}
function dragEnded(event, d) {
if (!event.active) force.alphaTarget(0);
d.fx = undefined;
d.fy = undefined;
}
function addNode(event, d) {
const nodeId = graph.nodes.length
graph.nodes.push({id: nodeId})
graph.links.push({source: d, target: nodeId, distance: 1})
initialize()
} body {
height: 100%;
background: #e6e7ee;
overflow: hidden;
margin: 0px;
}
.faded {][1]
opacity: 0.1;
transition: 0.3s opacity;
}
.highlight {
opacity: 1;
} <meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- d3.js framework -->
<script src="https://d3js.org/d3.v6.js"></script>
<!-- fontawesome stylesheet https://fontawesome.com/ -->
<script src="https://kit.fontawesome.com/39094309d6.js" crossorigin="anonymous"></script>
</head>
<style>
</style>
<body>
<svg id="svg"></svg>
</body>【问题讨论】：
标签： d3.js