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Logarithmic Axis in JavaScript Chart control

03 Mar 2021 / 3 minutes to read

Logarithmic axis uses logarithmic scale and it is very useful in visualizing data, when it has numerical values in both lower order of magnitude (eg: 10-6) and higher order of magnitude (eg: 106).

Source
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index.ts
index.html
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import { Chart, DateTime, LineSeries, Logarithmic } from '@syncfusion/ej2-charts';
Chart.Inject(LineSeries, DateTime, Logarithmic);
let chartData: any[] = [{ x: new Date(1995, 0, 1), y: 80 }, { x: new Date(1996, 0, 1), y: 200 },
    { x: new Date(1997, 0, 1), y: 400 }, { x: new Date(1998, 0, 1), y: 600 },
    { x: new Date(1999, 0, 1), y: 700 }, { x: new Date(2000, 0, 1), y: 1400 },
    { x: new Date(2001, 0, 1), y: 2000 }, { x: new Date(2002, 0, 1), y: 4000 },
    { x: new Date(2003, 0, 1), y: 6000 }, { x: new Date(2004, 0, 1), y: 8000 },
    { x: new Date(2005, 0, 1), y: 11000 }];
let chart: Chart = new Chart({
    primaryXAxis: {
        valueType: 'DateTime',
    },
    primaryYAxis: {
        // Logarithmic scale in primary X Axis
        valueType: 'Logarithmic',
    },
    series:[{
        dataSource: chartData,
        xName: 'x', yName: 'y',
        type: 'Line'
    }],

}, '#element');
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<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Note: To use log axis, we need to inject Logarithmic using method Chart.Inject(Logarithmic) and set the valueType of axis to Logarithmic.

Range

Range of an axis, will be calculated automatically based on the provided data, you can also customize the range of an axis using minimum,maximum and interval property of the axis.

Source
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index.ts
index.html
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import { Chart, DateTime, LineSeries, Logarithmic } from '@syncfusion/ej2-charts';
import { logData } from './datasource.ts';
Chart.Inject(LineSeries, DateTime, Logarithmic);

let chart: Chart = new Chart({
    primaryXAxis: {
        valueType: 'DateTime',
    },
    primaryYAxis: {
        //Logarithmic scale range in primary X Axis
        valueType: 'Logarithmic',
        minimum: 100,
        maximum: 10000
    },
    series:[{
        dataSource: logData,
        xName: 'x', yName: 'y',
        type: 'Line'
    }],

}, '#element');
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Logarithmic Base

Logarithmic base can be customized by using the logBase property of the axis. For example when the logBase is 5, the axis values follows 5-2, 5-1, 50, 51, 52 etc.

Source
Preview
index.ts
index.html
Copied to clipboard
import { Chart, DateTime, LineSeries, Logarithmic } from '@syncfusion/ej2-charts';
import { logData } from './datasource.ts';
Chart.Inject(LineSeries, DateTime, Logarithmic);

let chart: Chart = new Chart({
    primaryXAxis: {
        valueType: 'DateTime',
    },
    primaryYAxis: {
        valueType: 'Logarithmic',
        // logBase for logarithmic scale
        logBase: 2
    },
    series:[{
        dataSource: logData,
        xName: 'x', yName: 'y',
        type: 'Line'
    }],

}, '#element');
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>

Logarithmic Interval

Logarithmic axis interval can be customized by using the interval property of the axis. When the logarithmic base is 10 and logarithmic interval is 2, then the axis labels are placed at an interval of 102. The default value of the interval is 1.

Source
Preview
index.ts
index.html
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import { Chart, DateTime, LineSeries, Logarithmic } from '@syncfusion/ej2-charts';
import { logData } from './datasource.ts';
Chart.Inject(LineSeries, DateTime, Logarithmic);

let chart: Chart = new Chart({
primaryXAxis: {
    valueType: 'DateTime',
},
primaryYAxis: {
    //Logarithmic interval in primary X Axis
    valueType: 'Logarithmic',
    interval: 2
    },
    series:[{
        dataSource: logData,
        xName: 'x', yName: 'y',
        type: 'Line'
    }],

}, '#element');
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='element'></div>
    </div>
</body>

</html>