dc.js更改Choropleth映射中未定义数据的默认颜色 [英] dc.js Change default color for undefined data in choropleth map

问题描述

我正在使用dc.js和 dc.geoChoroplethChart()来创建一个choropleth映射.以前使用 colorCalculator()，我可以为空数据设置默认颜色.

I'm using dc.js for a choropleth map with dc.geoChoroplethChart(). Previously with colorCalculator(), I can set the default color for null data.

chart.colors(colorScale)
     .colorCalculator(
         function (d) { 
             return d === undefined ? '#ddd' : zipChart.colors()(d);
         })

日志表明 colorMixin.colorCalculator 已被弃用，并告诉我改用 colorMixin.colors 和 colorMixin.colorAccessor .我尝试了一下:

The log indicates colorMixin.colorCalculator has been deprecated and tell me to use colorMixin.colors and colorMixin.colorAccessor instead. I gave it a try:

chart.colors(colorScale)
     .colorAccessor(function (d) {return d;})

该地图仍然有效，但是未定义数据的默认颜色现在为黑色.只有几个文档.如何在没有 colorCalculator 的情况下进行更改?

The map still works but the default color for undefined data is now black. There is only a few documentation. How can I change it like without colorCalculator?

推荐答案

不推荐使用 colorCalculator 函数是一个错误，警告将很快删除.

Deprecating colorCalculator function was a mistake and the warning will be removed soon.

https://github.com/dc-js/dc.js/issues/1493

我不喜欢函数的实现方式，当时我认为scale可以完成函数可以完成的所有工作，但是为这种事情编写函数更容易.

I don't like the way the function was implemented, and at the time I thought that scales can do everything that a function can do, but it is simply easier to write a function for this kind of thing.

有时候，特殊情况是处理规则异常的最佳方法！

Sometimes a special case is the best way to deal with an exception to the rule!

或者，如果您使用连续或有序的色标，则可以使用

Alternately, if you are using a continuous or ordinal color scale, you may be able to use .unknown() which is a cleaner solution.

这篇关于dc.js更改Choropleth映射中未定义数据的默认颜色的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！