Highcharts - 处理和显示具有对数Y轴的折线图系列中零（或负）值的最佳方法

问题描述

在我的HighChart线图中，系列数据是从我的Ruby on Rails应用程序动态提供的。有时系列值是零或更少，这是HighCharts的问题，它会引发以下异常：

  Highcharts错误＃10 
无法在对数轴上绘制零或零值
  

所以作为解决方法，我处理我的红宝石数组，以有条件地用一个微不足道的正数代替零值，例如0.00001，如下所示：

  oil_vol_array = d_array [1] .map {| e | （e   

这样可以防止引发异常，但显示屏显示如果起始值为零，可以从0.0001开始（可以理解，因为我问过它）。更理想的显示方法是将图形设置为零，但HighChart不喜欢它：（b / b）

有没有办法实现这一点？

解决方案

您是否尝试过使用？

  var chart = new Highcharts.Chart（{
 yAxis：{ 
标签：{
 formatter：function（）{
 if（this.value === 0.00001）{
 return 0; 
} else {
返回this.value; 
} 
} 
} 
} 
}）; 
  

In my HighChart line graphs, the series data is being fed from my Ruby on Rails application dynamically. Sometimes the series values are zeros or less which is a problem for HighCharts and it throws the following exception:

Highcharts Error #10
Can't plot zero or subzero values on a logarithmic axis

So as a work-around, I process my ruby array to conditionally replace a zero of less value with an insignificant positive number, .e.g. 0.00001 as shown below:

oil_vol_array = d_array[1].map { |e| (e < 0.0001) ? 0.0001 : e.round(3) }

This prevents the exception being thrown, but the display shows the graph starting at 0.0001 if the starting value is zero (understandably so, since I asked it to). A more desirable display would be to start the graph at zero, but HighChart doesn't like it :(

Is there a way that this can be achieved?

解决方案

Have you tried using a label formatter?

var chart = new Highcharts.Chart({
    yAxis: {
        labels: {
            formatter: function() {
                if(this.value === 0.00001){
                    return 0;
                } else {
                    return this.value;
                }
            }
        }
    }
});

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