我試圖重現例如B is for breaking links
在this tutorial。損壞的鏈接與閾值滑塊在d3.js
這是我到目前爲止的代碼:
output.json
文件output.json是this link。
的index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.node {
stroke: #fff;
stroke-width: 1.5px;
}
.link {
stroke: #999;
stroke-opacity: .6;
}
h3 {
color: #1ABC9C;
text-align:center;
font-style: italic;
font-size: 14px;
font-family: "Helvetica";
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
var width = 960,
height = 500;
var color = d3.scale.category20();
var force = d3.layout.force()
.charge(-120)
.linkDistance(30)
.size([width, height]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var graphRec, node, link;
d3.json("output.json", function(error, graph) {
if (error) throw error;
graph = JSON.parse(JSON.stringify(graph));
force
.nodes(graph.nodes)
.links(graph.links)
.start();
graphRec = graph;
link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value); });
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);
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; });
});
});
//adjust threshold
function threshold(thresh) {
graphRec.links.splice(0, graphRec.links.length);
for (var i = 0; i < graphRec.links.length; i++) {
if (graphRec.links[i].value > thresh) {graphRec.links.push(graphRec.links[i]);}
}
restart();
}
//Restart the visualisation after any node and link changes
function restart() {
link = link.data(graphRec.links);
link.exit().remove();
link.enter().insert("line", ".node").attr("class", "link");
node = node.data(graphRec.nodes);
node.enter().insert("circle", ".cursor").attr("class", "node").attr("r", 5).call(force.drag);
force.start();
}
</script>
<form>
<h3> Link threshold 0 <input type="range" id="thersholdSlider" name="points" value = 0 min="0" max="10" onchange="threshold(this.value)"> 10 </h3>
</form>
現在圖形看起來像預期的那樣開始,但是當我嘗試移動滑塊,所有環節斷了,所有的節點都分離。
即使我得到的滑塊回到0
,鏈接仍然中斷。
什麼問題?我該如何解決它?
謝謝!
我已經試過了,但我在原來的代碼中發現的問題,主要是關於'graph'變量的作用域。在原始代碼中,'JSON'數據在'