D3节点半径取决于链接数:weight属性 [英] D3 Node radius depends on number of links : weight property
问题描述
我正在尝试使用D3创建一个力向图. 到目前为止,节点的半径取决于JSON (d.size)
I am trying to create a force directed graph with D3. As for now, the radius of the node depends on a key-value pair in JSON ( d.size )
我知道 d3.weight 属性,该属性可用于计算链接数并与圆的 radius属性相关联,但是我可以通过某种方式无法正常工作.
I'm aware of the d3.weight property which can be used to count the number of links and associate with radius attribute of the circle, but I somehow could not get it to work.
请帮助我.
找到以下代码:
d3.json('graph.json', (error, graph) => {
const width = 1200;
const height = 900;
const simulation = d3.forceSimulation()
.nodes(graph.nodes)
.force('link', d3.forceLink().id(d => d.id))
.force('charge', d3.forceManyBody().strength([-605]))
.force('center', d3.forceCenter(width / 2, height / 2))
.on('tick', ticked);
simulation.force('link')
.links(graph.links)
.distance([140]);
const R = 30;
const svg = d3.select('body').append('svg')
.attr('width', width)
.attr('height', height);
// add defs-marker
// add defs-markers
svg.append('svg:defs').selectAll('marker')
.data([{ id: 'end-arrow', opacity: 1 }, { id: 'end-arrow-fade', opacity: 0.1 }])
.enter().append('marker')
.attr('id', d => d.id)
.attr('viewBox', '0 0 10 10')
.attr('refX', 2 * R)
.attr('refY', 5)
.attr('markerWidth', 4)
.attr('markerHeight', 4)
.attr('orient', 'auto')
.append('svg:path')
.attr('d', 'M0,0 L0,10 L10,5 z')
.style('opacity', d => d.opacity);
let link = svg.selectAll('line')
.data(graph.links)
.enter().append('line');
link
.attr('class', 'link')
.attr('marker-end', 'url(#end-arrow)')
.on('mouseout', fade(1));
let node = svg.selectAll('.node')
.data(graph.nodes)
.enter().append('g')
.attr('class', 'node');
node.append('circle')
.attr('r', function (d) {
return (d.size * 12);
})
.on('mouseover', fade(0.1))
.on('mouseout', fade(1))
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
node.append('text')
.attr('x', 0)
.attr('dy', '.35em')
.text(d => d.name);
function ticked() {
link
.attr('x1', d => d.source.x)
.attr('y1', d => d.source.y)
.attr('x2', d => d.target.x)
.attr('y2', d => d.target.y);
node
.attr('transform', d => `translate(${d.x},${d.y})`);
}
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
const linkedByIndex = {};
graph.links.forEach(d => {
linkedByIndex[`${d.source.index},${d.target.index}`] = 1;
});
function isConnected(a, b) {
return linkedByIndex[`${a.index},${b.index}`] || linkedByIndex[`${b.index},${a.index}`] || a.index === b.index;
}
function fade(opacity) {
return d => {
node.style('stroke-opacity', function (o) {
const thisOpacity = isConnected(d, o) ? 1 : opacity;
this.setAttribute('fill-opacity', thisOpacity);
return thisOpacity;
});
link.style('stroke-opacity', o => (o.source === d || o.target === d ? 1 : opacity));
link.attr('marker-end', o => (opacity === 1 || o.source === d || o.target === d ? 'url(#end-arrow)' : 'url(#end-arrow-fade)'));
};
}
})
JSON结构如下:
{
"nodes": [
{
"name": "A",
"id": 0,
"size": 1
},
{
"name": "D",
"id": 1,
"size": 2
},
{
"name": "K",
"id": 2,
"size": 3
}
],
"links": [
{
"source": 0, //id of the soure application
"target": 1 //id of the destination application
},
{
"source": 0,
"target": 2
},
{
"source": 3,
"target": 4
}
]
}
推荐答案
d3.v4不支持weight属性.因此,我认为您必须自己计算节点权重.尝试这种方式.
d3.v4 does not support weight property. So I think you will have to calculate the node weight by yourselves. try this way.
node.append("circle")
.attr("r", function(d) {
d.weight = link.filter(function(l) {
return l.source.index == d.index || l.target.index == d.index
}).size();
var minRadius = 10;
return minRadius + (d.weight * 2);
});
在d3.v3中,我们具有重量属性,可以按如下所示使用.
In d3.v3, we have weight property and can be used as shown below.
node.append("circle")
.attr("r", function(d) {
var minRadius = 10;
return minRadius + (d.weight * 2);
});
小提琴示例- https://jsfiddle.net/gilsha/9d6edrte/
这篇关于D3节点半径取决于链接数:weight属性的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!