javascript 如何在图形的 D3 节点中添加自定义颜色
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How to add custom colors in D3 nodes of a graph
提问by lucifer
I am using D3 api for a graph where a couple of nodes are forming from a parent node i want to color the nodes of the whole graph in a manner that each parent node has a fixed color and the child nodes has different color i.e a root node always have red color and the left child is blue and the right one is green and if only one child is there it is green .I am using this api ,,
我正在将 D3 api 用于图形，其中从父节点形成几个节点我想以每个父节点具有固定颜色而子节点具有不同颜色的方式为整个图的节点着色，即根节点总是有红色，左边的孩子是蓝色的，右边的孩子是绿色的，如果只有一个孩子在那里，它是绿色的。我正在使用这个 api，，
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js?1.27.1"></script>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.geom.js?1.27.1"></script>
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js?1.27.1"></script>
<style type="text/css">
line.link {
stroke: #ccc;
}
circle.node {
fill: #000;
stroke: #fff;
stroke-width: 1.5px;
}
</style>
</head>
<body>
<script type="text/javascript">
var w = 960,
h = 500,
r = d3.scale.sqrt().domain([0, 20000]).range([0, 20]);
var force = d3.layout.force()
.gravity(.01)
.charge(-120)
.linkDistance(60)
.size([w, h]);
var svg = d3.select("body").append("svg:svg")
.attr("width", w)
.attr("height", h);
d3.xml("flare.xml", "application/xml", function(xml) {
var nodes = self.nodes = d3.select(xml).selectAll("*")[0],
links = self.links = nodes.slice(1).map(function(d) {
return {source: d, target: d.parentNode};
});
force
.nodes(nodes)
.links(links)
.start();
var link = svg.selectAll("line.link")
.data(links)
.enter().append("svg:line")
.attr("class", "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; });
var node = svg.selectAll("circle.node")
.data(nodes)
.enter().append("svg:circle")
.attr("class", "node")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", function(d) { return r(d.textContent) || 5; })
.call(force.drag);
force.on("tick", function() {
nodes[0].x = w / 2;
nodes[0].y = h / 2;
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; });
});
});
</script>
</body>
</html>
can anyone help me
谁能帮我
回答by Thibaud Colas
SVG has its own CSS properties, one of which being fill. It sets the fill color of an SVG element.
SVG 有自己的 CSS 属性，其中之一是fill. 它设置 SVG 元素的填充颜色。
Here is how you use it with D3:
以下是将它与 D3 一起使用的方法：
var node = svg.selectAll("circle.node")
.data(nodes)
.enter().append("svg:circle")
.style("fill", function (d) { return '#1f77b4'; })
.attr("class", "node")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", function(d) { return r(d.textContent) || 5; })
.call(force.drag);
Here the color value (#1f77b4) will be the same for all nodes. If you want to color your nodes with a specific algorithm, D3 ships with predefined categorical color scales.
这里#1f77b4所有节点的颜色值 ( ) 都相同。如果您想使用特定算法为节点着色，D3 附带预定义的分类色阶。
Edit: Here is a related SO question. One of its answers has a good custom ordinal color scale example.
编辑：这是一个相关的 SO 问题。它的答案之一有一个很好的自定义序数色标示例。
