【发布时间】:2016-01-26 13:19:42
【问题描述】:
如何使用 D3 在强制有向图中显示单击目标节点的源节点名称?
下面的sn-p来自一些example code for directed graphs by Mike Bostock。如何修改此基本代码,以便在单击图形上的节点时,该节点的目标值会显示在屏幕上(在这种情况下,我想显示 name 属性)?
例如"nodes"中的第0个元素是:
"nodes":[
{"name":"Myriel","group":1},
...
]
在"links" 中,目标的定义如下:
"links":[
{"source":1,"target":0,"value":1}, // Napoleon
{"source":2,"target":0,"value":8}, // Mlle.Baptistine
{"source":3,"target":0,"value":10}, // Mme.Magloire
{"source":3,"target":2,"value":6},
{"source":4,"target":0,"value":1}, // CountessdeLo
{"source":5,"target":0,"value":1}, // Geborand
{"source":6,"target":0,"value":1}, // Champtercier
{"source":7,"target":0,"value":1}, // Cravatte
{"source":8,"target":0,"value":2}, // Count
{"source":9,"target":0,"value":1}, // OldMan
...
{"source":11,"target":0,"value":5}, // Valjean
...
]
然后点击节点Myriel会显示:
拿破仑、巴普蒂斯汀夫人、马格洛瓦夫人、伯爵夫人、格伯朗、尚普特谢、克拉瓦特、伯爵、老人、冉阿让
Myriel 在图中位于此处:
以下是 JavaScript 代码:
var width = 960,
height = 500;
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var color = d3.scale.category20();
var force = d3.layout.force()
.charge(-120)
.linkDistance(30)
.size([width, height]);
d3.json("https://gist.githubusercontent.com/mbostock/4062045/raw/9653f99dbf6050b0f28ceafbba659ac5e1e66fbd/miserables.json", function(error, graph) {
if (error) throw error;
force
.nodes(graph.nodes)
.links(graph.links)
.start();
var link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value); });
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 5)
.style("fill", function(d) { return color(d.group); })
.call(force.drag)
.on("click",function(d){
var targets = graph.links.filter(function(i){
return i.target.name == d.name
});
tip.show( targets.map(function(i){ return i.source.name;}) );
});
node.append("title")
.text(function(d) { return d.name; });
force.on("tick", function() {
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("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
});
var width = 960,
height = 500;
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var color = d3.scale.category20();
var force = d3.layout.force()
.charge(-120)
.linkDistance(30)
.size([width, height]);
d3.json("https://gist.githubusercontent.com/mbostock/4062045/raw/9653f99dbf6050b0f28ceafbba659ac5e1e66fbd/miserables.json", function(error, graph) {
if (error) throw error;
force
.nodes(graph.nodes)
.links(graph.links)
.start();
var link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value); });
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 5)
.style("fill", function(d) { return color(d.group); })
.call(force.drag)
.on("click",function(d){
var targets = graph.links.filter(function(i){
return i.target.name == d.name
});
tip.show( targets.map(function(i){ return i.source.name;}) );
});
node.append("title")
.text(function(d) { return d.name; });
force.on("tick", function() {
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("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
});
.node {
stroke: #fff;
stroke-width: 1.5px;
}
.link {
stroke: #999;
stroke-opacity: .6;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.0/d3.min.js"></script>
【问题讨论】:
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注意: 用户发布了这样一个问题,我认为其中的答案对网站很有价值。尽管用户在我能够发布我的解决方案之前删除了他们的问题。因此,我用其他信息重新创建了这个问题,以便我可以分享我的答案。欢迎其他答案。
标签: javascript d3.js force-layout