如何为D3中的饼图颜色标签? [英] How do I color labels for my pie chart in D3?

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问题描述

我开始使用以下示例:



http://jsfiddle.net/nrabinowitz/GQDUS/



我想让每个圆弧的标签都是圆弧的颜色。 / p>

我得到它的颜色所有的标签相同的颜色。



在我的代码中,我为最后一行做了以下操作:

  arcs.append(svg:text)。attr(transform,function(d){var c = arc.centroid(d) x = c [0]; y = c [1]; h = Math.sqrt(x * x + y * y); returntranslate(+(x / h * 100)+' (text-anchor,h * 90)+);})text(function(d){return Math.round((d.data/total)* 100)+%;} middle)。attr(fill,color_data.pop()); 

这使得所有标签都是数组中的第一个颜色。但是我需要每个标签在数组中是不同的颜色。

解决方案

只需添加相同的填充参数用于弧

  arcs.append(svg:text)
.attr变换函数(d){
var c = arc.centroid(d),
x = c [0],
y = c [1],
// pythagorean定理斜率
h = Math.sqrt(x * x + y * y);
returntranslate(+(x / h * labelr)+','+
* labelr)+);
})
.attr(dy,.35em)
.attr(fill,function(d,i){return color ();
.attr(text-anchor,function(d){
//是否超过了中心?
return(d.endAngle + d.startAngle) / 2> Math.PI?
end:start;
})
.text(function(d,i){return d.value.toFixed(2) });


I started out with the following example:

http://jsfiddle.net/nrabinowitz/GQDUS/

I am trying to get the labels for each arc to be the color of the arc.

I have gotten it to where it colors all the labels the same color. But I do now know how to access each individual label and change the color.

In my code I have done the following for the last line:

    arcs.append("svg:text").attr("transform", function (d){var c = arc.centroid(d); x =   c[0]; y = c[1]; h = Math.sqrt(x*x + y*y);  return "translate(" + (x/h * 100) + ',' + (y/h * 90) + ")";}).text(function(d){return Math.round((d.data/total)*100)+"%";}).attr("text-anchor","middle").attr("fill","color_data.pop()");

This makes all the labels the first color in my array. However I need each label to be a different color in the array. I am just not sure how to access the labels so I can loop through and change the color.

解决方案

Just add the same fill argument that was used for the arcs e.g.

arcs.append("svg:text")
    .attr("transform", function(d) {
        var c = arc.centroid(d),
            x = c[0],
            y = c[1],
            // pythagorean theorem for hypotenuse
            h = Math.sqrt(x*x + y*y);
        return "translate(" + (x/h * labelr) +  ',' +
           (y/h * labelr) +  ")"; 
    })
    .attr("dy", ".35em")
    .attr("fill", function(d, i) { return color(i); })
    .attr("text-anchor", function(d) {
        // are we past the center?
        return (d.endAngle + d.startAngle)/2 > Math.PI ?
            "end" : "start";
    })
    .text(function(d, i) { return d.value.toFixed(2); });

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