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javascript - 如何在 sankey 中添加带有工具提示的节点名称列表

转载 作者:行者123 更新时间:2023-11-29 14:49:32 26 4
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我用 R 中的 rChars 包做了一个桑基图。

但是我想添加一个功能,当我们移动到链接或目标节点时,它会在工具提示中显示源节点的所有名称(或在图形右上角的新框)。例如,当我们移动到节点“target1”时,它会显示“ddd.fr, pramana.fr”。

我是 d3.js 的新手,对 svg 属性知之甚少。我试图用“link.append(“title”).text”或“node.append(“title”).text”做一些事情。但是我所做的似乎没有用,因为函数(d)总是返回一个数据而不是一个数组。

这是我的代码,希望有人能帮忙,谢谢!

<!doctype HTML>
<meta charset = 'utf-8'>
<html>
<head>
<link rel='stylesheet' href='http://timelyportfolio.github.io/rCharts_d3_sankey/css/sankey.css'>

<script src='http://timelyportfolio.github.io/rCharts_d3_sankey/js/d3.v3.js' type='text/javascript'></script>
<script src='http://timelyportfolio.github.io/rCharts_d3_sankey/js/sankey.js' type='text/javascript'></script>

<style>
.rChart {
display: block;
margin-left: auto;
margin-right: auto;
width: 900px;
height: 1000px;
}
</style>

</head>
<body >

<div id = 'chart202c4a213951' class = 'rChart rCharts_d3_sankey'></div>
<!--Attribution:
Mike Bostock https://github.com/d3/d3-plugins/tree/master/sankey
Mike Bostock http://bost.ocks.org/mike/sankey/
-->

<script>
(function(){
var params = {
"dom": "chart202c4a213951",
"width": 800,
"height": 300,
"data": {
"source": [ "A.fr", "B.fr", "C.fr", "ddd.fr", "pramana.fr", "pramana.fr" ],
"target": [ "pramana.fr", "pramana.fr", "ddd.fr", "target1", "target1", "target2" ],
"cat": [ 0, 1, 0, 1, 0, -1 ] ,
"value": [ 1, 1, 1, 1, 1, 1]
},
"nodeWidth": 15,
"nodePadding": 10,
"layout": 32,
"units": "freq",
"title": "Sankey Diagram pramana",
"id": "chart202c4a213951"
};

params.units ? units = " " + params.units : units = "";

//hard code these now but eventually make available
var formatNumber = d3.format("0,.0f"), // zero decimal places
format = function(d) { return formatNumber(d) + units; },
color = d3.scale.category20();

if(params.labelFormat){
formatNumber = d3.format(".2%");
}

var svg = d3.select('#' + params.id).append("svg")
.attr("width", params.width)
.attr("height", params.height);

var sankey = d3.sankey()
.nodeWidth(params.nodeWidth)
.nodePadding(params.nodePadding)
.layout(params.layout)
.size([params.width,params.height]);

var path = sankey.link();

var data = params.data,
links = [],
nodes = [];

//get all source and target into nodes
//will reduce to unique in the next step
//also get links in object form
data.source.forEach(function (d, i) {
nodes.push({ "name": data.source[i] });
nodes.push({ "name": data.target[i] });
links.push({ "source": data.source[i], "target": data.target[i], "value": +data.value[i] });
});

//now get nodes based on links data
//thanks Mike Bostock https://groups.google.com/d/msg/d3-js/pl297cFtIQk/Eso4q_eBu1IJ
//this handy little function returns only the distinct / unique nodes
nodes = d3.keys(d3.nest()
.key(function (d) { return d.name; })
.map(nodes));

//it appears d3 with force layout wants a numeric source and target
//so loop through each link replacing the text with its index from node
links.forEach(function (d, i) {
links[i].source = nodes.indexOf(links[i].source);
links[i].target = nodes.indexOf(links[i].target);
});

//now loop through each nodes to make nodes an array of objects rather than an array of strings
nodes.forEach(function (d, i) {
nodes[i] = { "name": d };
});

sankey
.nodes(nodes)
.links(links)
.layout(params.layout);

var link = svg.append("g").selectAll(".link")
.data(links)
.enter().append("path")
.attr("class", "link")
.attr("d", path)
.style("stroke-width", function (d) { return Math.max(1, d.dy); })
.sort(function (a, b) { return b.dy - a.dy; });

link.append("title")
.text(function (d) { return d.source.name + " → " + d.target.name + "\n" + format(d.value); });

var node = svg.append("g").selectAll(".node")
.data(nodes)
.enter().append("g")
.attr("class", "node")
.attr("transform", function (d) { return "translate(" + d.x + "," + d.y + ")"; })
.call(d3.behavior.drag()
.origin(function (d) { return d; })
.on("dragstart", function () { this.parentNode.appendChild(this); })
.on("drag", dragmove));

node.append("rect")
.attr("height", function (d) { return d.dy; })
.attr("width", sankey.nodeWidth())
.style("fill", function (d) { return d.color = color(d.name.replace(/ .*/, "")); })
.style("stroke", function (d) { return d3.rgb(d.color).darker(2); })
.append("title")
.text(function (d) { return d.name + "\n" + format(d.value); });

node.append("text")
.attr("x", -6)
.attr("y", function (d) { return d.dy / 2; })
.attr("dy", ".35em")
.attr("text-anchor", "end")
.attr("transform", null)
.text(function (d) { return d.name; })
.filter(function (d) { return d.x < params.width / 2; })
.attr("x", 6 + sankey.nodeWidth())
.attr("text-anchor", "start");

// the function for moving the nodes
function dragmove(d) {
d3.select(this).attr("transform",
"translate(" + (
d.x = Math.max(0, Math.min(params.width - d.dx, d3.event.x))
) + "," + (
d.y = Math.max(0, Math.min(params.height - d.dy, d3.event.y))
) + ")");
sankey.relayout();
link.attr("d", path);
}
})();

</script>

</body>
</html>

最佳答案

在你的函数中,你应该检索其他节点的名称,这些节点是“源”(或“目标”,实现是相同的)到当前节点,你可以做这样的事情:

function(d,i){
d.sourceLinks.forEach(function(srcLnk){
// find the name of the other end of the link
});
d.targetLinks.forEach(function(tgtLnk){
// find the name of the other end of the link
});
}

换句话说,使用d.sourceLinksd.targetLinks。然后您逐渐一个接一个地添加名称,并显示在您认为合适的位置(工具提示、单独的框等)。

反过来,每个链接都有属性sourcetarget,您可以使用类似srcLnk.source.name的东西来获取名称作为当前节点“源”的节点之一。

我是凭空写的,所以请仔细检查所有内容,某些属性的名称可能与我所说的不同。

希望这对您有所帮助。


更新:jsfiddle

enter image description here

关键代码:

.append("title")
.text(function (d) {
var titleText = d.name + " - " +
format(d.value) + " total" + "\n" + "\n";
var sourcesText = "";
d.targetLinks.forEach(function(dstLnk){
sourcesText += "from " + dstLnk.source.name + " - " +
format(dstLnk.value) + "\n";
});
return titleText + sourcesText;
});

关于javascript - 如何在 sankey 中添加带有工具提示的节点名称列表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27845161/

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