如何解决根据json中的坐标定位节点
我试图让有向网络的节点看起来位于页面启动时json文档中反映的坐标处。但是，实际代码重新计算了节点位置，不符合我的应用程序的要求。有什么帮助吗？
主要代码
<!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">
<style type="text/css">
.node {}
.link {
stroke: #999;
stroke-opacity: .6;
stroke-width: 1px;
}
line {
stroke: rgb(212,212,212);
stroke-width: 1px;
shape-rendering: crispEdges;
}
svg {
box-sizing: border-box;
border: 1px solid rgb(212,212);
}
</style>
</head>
<body>
<svg width="960" height="600"></svg>
<script src="https://d3js.org/d3.v4.min.js" type="text/javascript"></script>
<script src="https://d3js.org/d3-selection-multi.v1.js"></script>
<script type="text/javascript">
var width = 960,height = 500,resolution = 150,r = 15;
var colors = d3.scaleOrdinal(d3.schemeCategory10);
var svg = d3.select("svg"),width = +svg.attr("width"),height = +svg.attr("height"),node,link;
svg.selectAll('.vertical')
.data(d3.range(1,width / resolution))
.enter().append('line')
.attr('class','vertical')
.attr('x1',function(d) { return d * resolution; })
.attr('y1',0)
.attr('x2',function(d) { return d * resolution; })
.attr('y2',height);
svg.selectAll('.horizontal')
.data(d3.range(1,height / resolution))
.enter().append('line')
.attr('class','horizontal')
.attr('x1',0)
.attr('y1',function(d) { return d * resolution; })
.attr('x2',width)
.attr('y2',function(d) { return d * resolution; });
svg.append('defs').append('marker')
.attrs({'id':'arrowhead','viewBox':'-0 -5 10 10','refX':13,'refY':0,'orient':'auto','markerWidth':13,'markerHeight':13,'xoverflow':'visible'})
.append('svg:path')
.attr('d','M 0,-5 L 10,0 L 0,5')
.attr('fill','#999')
.style('stroke','none');
var simulation = d3.forceSimulation()
.force("link",d3.forceLink().id(function (d) {return d.id;}).distance(150).strength(1))
//.force("charge",d3.forceManyBody())
//.force("center",d3.forceCenter(width / 2,height / 2));
d3.json("graph.json",function (error,graph) {
if (error) throw error;
update(graph.links,graph.nodes);
})
function update(links,nodes) {
link = svg.selectAll(".link")
.data(links)
.enter()
.append("line")
.attr("class","link")
.attr('marker-end','url(#arrowhead)')
link.append("title")
.text(function (d) {return d.type;});
edgepaths = svg.selectAll(".edgepath")
.data(links)
.enter()
.append('path')
.attrs({
'class': 'edgepath','fill-opacity': 0,'stroke-opacity': 0,'id': function (d,i) {return 'edgepath' + d.type}
})
.style("pointer-events","none");
edgelabels = svg.selectAll(".edgelabel")
.data(links)
.enter()
.append('text')
.style("pointer-events","none")
.attrs({
'class': 'edgelabel',i) {return 'edgelabel' + i},'font-size': 15,'fill': '#000'
});
edgelabels.append('textPath')
.attr('xlink:href',function (d,i) {return '#edgepath' + i})
.style("text-anchor","middle")
.style("pointer-events","none")
.attr("startOffset","50%")
.text(function (d) {return d.type});
node = svg.selectAll(".node")
.data(nodes)
.enter()
.append("g")
.attr("class","node")
.attr('cx',function(d) { return d.x; })
.attr('cy',function(d) { return d.y; })
.call(d3.drag()
.on("start",dragstarted)
.on("drag",dragged)
//.on("end",dragended)
);
node.append("circle")
.attr("r",15)
.style("fill",i) {return colors(i);})
node.append("title")
.text(function (d) {return d.social;});
node.append("text")
.attr("dy",-3)
.text(function (d) {return d.name+":"+d.social;});
simulation
.nodes(nodes)
.on("tick",ticked);
simulation.force("link")
.links(links);
}
function ticked() {
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;});
node
.attr("transform",function (d) {return "translate(" + d.x + "," + d.y + ")";});
edgepaths.attr('d',function (d) {
return 'M ' + d.source.x + ' ' + d.source.y + ' L ' + d.target.x + ' ' + d.target.y;
});
}
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(1.0).restart()
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
gridX = round(Math.max(r,Math.min(width - r,d.fx)),resolution);
gridY = round(Math.max(r,Math.min(height - r,d.fy)),resolution);
d3.select(this).attr('cx',d.fx = gridX).attr('cy',d.fy = gridY);
}
function round(p,n) {
return p % n < n / 2 ? p - (p % n) : p + n - (p % n);
}
</script>
</body>
</html>
这里我附上承载定向的json文档的数据 图数据：
{
"nodes": [
{
"name": "1","label": "1","social": "I","id": 1,"x": 150,"y": 450
},{
"name": "2","label": "2","social": "G","x": 300,"y": 150
},{
"name": "3","label": "3","social": "T","x": 450,"y": 300
}
],"links": [
{
"source": 1,"target": 2,"type": "N:1"
},{
"source": 2,"target": 3,"type": "1:N"
}
]
}
解决方法
此代码不起作用：
node = svg.selectAll(".node")
.data(nodes)
.enter()
.append("g")
.attr("class","node")
.attr('cx',function(d) { return d.x; })
.attr('cy',function(d) { return d.y; })
...
替换为：
node = svg.selectAll(".node")
.data(nodes)
.enter()
.append('g')
.classed('node',true)
.attr('transform',d => `translate(${d.x},${d.y})`)
...
attr('class') 更有用。
UPD：新创建的链接缺少初始坐标：
link = svg.selectAll(".link")
.data(links)
.enter()
.append("line")
.classed("link",true)
.attr('marker-end','url(#arrowhead)')
.attr("x1",d => d.source.x)
.attr("x2",d => d.target.x)
.attr("y1",d => d.source.y)
.attr("y1",d => d.target.y)
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