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Logarithmic axis in Angular Chart component

13 Mar 202613 minutes to read

The logarithmic axis uses a logarithmic scale and is particularly useful for visualizing data that spans a wide range of values. It effectively represents datasets that include both very small values (for example, 10-6) and very large values (for example, 106) within the same chart, improving readability and comparison.

To know about logarithmic axis, you can check on this video:

import { ChartModule } from '@syncfusion/ej2-angular-charts'
import { LogarithmicService, DateTimeService, LineSeriesService } from '@syncfusion/ej2-angular-charts'
import { Component, OnInit } from '@angular/core';

@Component({
imports: [
         ChartModule
    ],

providers: [ LogarithmicService, LineSeriesService, DateTimeService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y' name='Product X'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    ngOnInit(): void {
        this.chartData = [
                { 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 }
        ];
        this.primaryXAxis = {
            valueType: 'DateTime',
            title: 'Years',
            labelFormat: 'y'
        };
        this.primaryYAxis = {
           valueType: 'Logarithmic',
           title: 'Profit'
        };
        this.title = 'Product X Growth [1995-2005]';
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Note: To use the logarithmic axis, inject LogarithmicService into the @NgModule.providers and set the valueType property of the axis to Logarithmic.

Range

The range of the logarithmic axis is calculated automatically based on the provided data. This automatic calculation ensures that all data points are visible within the chart area. The axis range can also be customized explicitly using the minimum, maximum, and interval properties.

import { ChartModule } from '@syncfusion/ej2-angular-charts'
import { LogarithmicService, DateTimeService, LineSeriesService } from '@syncfusion/ej2-angular-charts'
import { Component, OnInit } from '@angular/core';
import { logData } from './datasource';
@Component({
imports: [
         ChartModule
    ],

providers: [ LogarithmicService, LineSeriesService, DateTimeService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y' name='Product X'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    ngOnInit(): void {
        this.chartData = logData;
        this.primaryXAxis = {
            valueType: 'DateTime',
            title: 'Years',
            labelFormat: 'y'
        };
        this.primaryYAxis = {
           valueType: 'Logarithmic',
           title: 'Profit',
           minimum: 100,
           maximum: 10000
        };
        this.title = 'Product X Growth [1995-2005]';
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Logarithmic base

The logarithmic base of the axis can be customized using the logBase property. This property determines how the axis values are distributed along the scale.
For example, when the logarithmic base is set to 5, the axis values follow the sequence 5-2, 5-1, 50, 51, 52, and so on.

import { ChartModule } from '@syncfusion/ej2-angular-charts'
import { LogarithmicService, DateTimeService, LineSeriesService } from '@syncfusion/ej2-angular-charts'
import { Component, OnInit } from '@angular/core';
import { logData } from './datasource';
@Component({
imports: [
         ChartModule
    ],

providers: [ LogarithmicService, LineSeriesService, DateTimeService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y' name='Product X'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    ngOnInit(): void {
        this.chartData = logData;
        this.primaryXAxis = {
            valueType: 'DateTime',
            title: 'Years',
            labelFormat: 'y'
        };
        this.primaryYAxis = {
           valueType: 'Logarithmic',
           title: 'Profit',
           logBase: 2
        };
        this.title = 'Product X Growth [1995-2005]';
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Logarithmic interval

The spacing between logarithmic axis labels can be controlled using the interval property. This property defines the step size between consecutive logarithmic values.
For example, when the logarithmic base is 10 and the interval is set to 2, the axis labels are placed at values such as 102, 104, and 106. The default value of the interval is 1.

import { ChartModule } from '@syncfusion/ej2-angular-charts'
import { LogarithmicService, DateTimeService, LineSeriesService } from '@syncfusion/ej2-angular-charts'
import { Component, OnInit } from '@angular/core';
import { logData } from './datasource';
@Component({
imports: [
         ChartModule
    ],

providers: [ LogarithmicService, LineSeriesService, DateTimeService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y' name='Product X'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis?: Object;
    public chartData?: Object[];
    public title?: string;
    public primaryYAxis?: Object;
    ngOnInit(): void {
        this.chartData = logData;
        this.primaryXAxis = {
            valueType: 'DateTime',
            title: 'Years',
            labelFormat: 'y'
        };
        this.primaryYAxis = {
           valueType: 'Logarithmic',
           title: 'Profit',
           interval: 2
        };
        this.title = 'Product X Growth [1995-2005]';
    }

}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));