Logarithmic axis in Angular Chart component

27 Sep 202314 minutes to read

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

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

import { Component, OnInit } from '@angular/core';

@Component({
    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 { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule } from '@syncfusion/ej2-angular-charts';
import { LogarithmicService, DateTimeService, LineSeriesService} from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ LogarithmicService, LineSeriesService, DateTimeService]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Note: To use log axis, we need to inject LogarithmicService into the @NgModule.providers 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 the axis using minimum, maximum and interval property of the axis.

import { Component, OnInit } from '@angular/core';
import { logData } from './datasource';
@Component({
    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 { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule } from '@syncfusion/ej2-angular-charts';
import { LogarithmicService, DateTimeService, LineSeriesService} from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ LogarithmicService, LineSeriesService, DateTimeService]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

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.

import { Component, OnInit } from '@angular/core';
import { logData } from './datasource';
@Component({
    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 { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule } from '@syncfusion/ej2-angular-charts';
import { LogarithmicService, DateTimeService, LineSeriesService} from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ LogarithmicService, LineSeriesService, DateTimeService]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

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.

import { Component, OnInit } from '@angular/core';
import { logData } from './datasource';
@Component({
    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 { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule } from '@syncfusion/ej2-angular-charts';
import { LogarithmicService, DateTimeService, LineSeriesService} from '@syncfusion/ej2-angular-charts';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, ChartModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ LogarithmicService, LineSeriesService, DateTimeService]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);