Multi axis capability

You talked about multi axis in https://github.com/frappe/charts/issues/93

But there is no reference to it in the doc, so I have a proposal:

{
    xAxis: [{
       id: 'bottom-axis',
       title: 'Time'
       position: 'bottom'
    }],
    yAxis: [
        {
            id: 'left-axis',
            position: 'left',
            title: 'Rate',
            unit: ['point', 'points'], // array with [singular, plural] or simple string for both
            // tooltipUnit: unit as default value 
            // tickUnit: unit as default value 
        },
        {
            id: 'right-axis',
            position: 'right',
            title: 'Price',
            unit: '$'
        }
    ],

    labels: [
        {
            axisID: "bottom-axis",  // refer to a xAxis id
            values: ["12am-3am", "3am-6am", "6am-9am", "9am-12pm", "12pm-3pm", "3pm-6pm", "6pm-9pm", "9pm-12am"]
       }
    ],

    datasets: [
       {
          axisID: "left-axis", // refer to a yAxis id
          name: "Some Data",
          chartType: 'bar',
          values: [25, 40, 30, 35, 8, 52, 17, -4]
        },
        {
          axisID: "left-axis",
          name: "Another Data",
          chartType: 'bar',
          values: [25, 40, 30, 35, 8, 52, 17, -4]
        },
        {
          axisID: "right-axis",
          name: "Another Data",
          chartType: 'bar',
          values: [25, 40, 30, 35, 8, 52, 17, -4],
        }
    }
}

there is an opportunity to solve https://github.com/frappe/charts/issues/128 too

[phoet]

As an open-source maintainer, I understand the desire to reduce the amount of time that you need to dedicate to project. In order to do that and still be able to improve the library and adapt it to users needs, it would be helpful to give guidance to developers willing to implement the feature themselves.

I really like the simplicity of the library and the looks of the default charts. Unfortunately without the option of having at least two axis, it’s not a fit for my usecase and probably a lot of others as well.

I’d like to show the total number of something, say infections, and the daily increase of cases. Since both numbers run out of scale quickly, the chart is unusable. I’m currently working around this by providing 2 different charts, but that is suboptimal.

As you can see in the screenshot, it’s basically impossible to see the difference in daily increase at a glance.

[rvbd]

Hi @pratu16x7 there is a note in #41 that this is implemented in V1, however I couldn’t find a way to use it. Did this go out to production? If not then I will look into contributing if possible.

The library as it is, is already good btw. It’s just that with data anlysis, sometimes 2 Y axis is required.