Creating personalized Date and Time formatting on the X axis in Lightningchart JS

I have an X-axis representing time intervals in 15-second increments.

["2020-05-22 14:20:22", "173.9"]
["2020-05-22 14:20:40", "175.3"]
["2020-05-22 14:20:58", "172.4"]

In my attempt to add this data to the chart, I used the following code:

for(var key in json)
{

    var xTime = stringToDate(json[key][0]);
    var yVal  =  parseFloat(json[key][1]);
    series.add({ x: timer, y: yVal})

}

function stringToDate(s)  {
  s = s.split(/[-: ]/);
  return new Date(s[0], s[1]-1, s[2], s[3], s[4], s[5]);
}

However, the resulting chart displayed strange values on the x-axis.

https://i.sstatic.net/ES3AF.png

javascriptlightningchart

Answer №1

When utilizing the DateTime axis in LightningChart JS, it is important to provide data in millisecond values rather than direct Date objects. If your data is in Date objects, you must use the getTime() method to convert them to milliseconds for display on the chart using a AxisTickStrategies.DateTime. You can set the default tick strategy by including defaultAxisXTickStrategy or defaultAxisYTickStrategy for the Y axis.

If you need to display current time or time close to it, remember to establish an origin and add offsets from that origin when inputting times.

const dateOrigin = new Date()
const chart = lightningChart().ChartXY({
    defaultAxisXTickStrategy: AxisTickStrategies.DateTime(dateOrigin)
})

const series = chart.addLineSeries()
const xTime = new Date(new Date().getTime() + 100000000)
const yVal = 1
series.add({ x: xTime.getTime() - dateOrigin.getTime(), y: yVal})

Below is a functional example:

const {
    lightningChart,
    AxisTickStrategies
} = lcjs

// Create a XY Chart.
const dateOrigin = new Date()
const chart = lightningChart().ChartXY({
    defaultAxisXTickStrategy: AxisTickStrategies.DateTime(dateOrigin)
})

const series = chart.addLineSeries()
series.setCursorInterpolationEnabled(false)

const data = [
    ["2020-05-22 14:20:22", "173.9"],
    ["2020-05-22 14:20:40", "175.3"],
    ["2020-05-22 14:20:58", "172.4"]
]

function stringToDate(s)  {
  s = s.split(/[-: ]/);
  return new Date(s[0], s[1]-1, s[2], s[3], s[4], s[5]);
}

for(var key in data)
{
    var xTime = stringToDate(data[key][0]);
    var yVal  =  parseFloat(data[key][1]);
    series.add({ x: xTime.getTime() - dateOrigin.getTime(), y: yVal})
}
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