问题描述
我有一个圆环图,有3个类别(弧):Facebook(50%),Twitter(30%)和Instagram(20%)。绘制图表是相当容易,但我想知道如何插入一个图标在每个弧与社会网络的各自的符号(使用D3或甚至C3)。
I have a Donut Chart with 3 categories (arcs): Facebook (50%), Twitter(30%) and Instagram(20%). Plot the chart is fairly easy, but I want to know how to insert an icon in each arc with the respective symbol of the social network (using D3 or even C3).
谢谢!
推荐答案
添加图片只是使用
...
.append("svg:image")
.attr("xlink:href","myimage.png")
.attr("width", "32")
.attr("height", "32");
您还需要定位( x
和 y
)。这些将默认为0,所以你可以使用 translate
,像这样找到弧的中心:
You'll also need to position (x
and y
). These will default to 0, so you could alternatively make use of a translate
, something like this to find the center of the arc:
.attr("transform", function(d){
return "translate(" + arc.centroid(d) + ")";
});
然而,这只是将图像的右上角固定到圆弧的中心,中心它需要使用图像的大小。这是完整的事情:
However, that just anchors the image's top-right corner to the centre of the arc, so to properly centre it you need to use the size of the image. Here's the full thing:
var image_width = 32;
var image_height = 32;
// add the image
arcs.append("svg:image").attr("transform", function(d){
// Reposition so that the centre of the image (not the top left corner)
// is in the centre of the arc
var x = arc.centroid(d)[0] - image_width/2;
var y = arc.centroid(d)[1] - image_height/2;
return "translate(" + x + "," + y + ")";
})
.attr("xlink:href",function(d) { return d.data.icon;})
.attr("width", image_width)
.attr("height", image_height);
这里有一个例子:
请注意,我已将图片图表数据中的路径。你只需要去寻找合适的图标!
Note that I've included the image paths in the chart data. You just need to go and find proper icons!
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