Cross hair and track ball in Angular Chart component

18 Nov 202218 minutes to read

Crosshair has a vertical and horizontal line to view the value of the axis at mouse or touch position.

Crosshair lines can be enabled by using enable property in the crosshair.

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

@Component({
    selector: 'app-container',
    template:
    `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [legendSettings]='legend' [crosshair]='crosshair'>
        <e-series-collection>
            <e-series [dataSource]='series1' type='Line' xName='x' yName='y' name='Temperature'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis: Object;
    public series1: Object[];
    public crosshair: Object;
    public title: string;
    public primaryYAxis: Object;
    public legend: Object;
    ngOnInit(): void {
        this.primaryXAxis = {
            valueType: 'DateTime',
            labelFormat: 'yMMM'
        };
        this.crosshair = { enable: true };
        this.series1 = ChartData.prototype.getCrosshairData().series1;
        this.legend = { visible: true };
        this.title = 'Weather Condition';
    }

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

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

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Tooltip for axis

Tooltip label for an axis can be enabled by using enable
property of crosshairTooltip in the corresponding axis.

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

@Component({
    selector: 'app-container',
    template:
    `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [legendSettings]='legend' [crosshair]='crosshair'>
        <e-series-collection>
            <e-series [dataSource]='series1' type='Line' xName='x' yName='y' name='Temperature'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis: Object;
    public series1: Object[];
    public majorGridLines: Object;
    public crosshair: Object;
    public title: string;
    public primaryYAxis: Object;
    public legend: Object;
    ngOnInit(): void {
        this.primaryXAxis = {
            valueType: 'DateTime',
            crosshairTooltip: { enable: true },
            labelFormat: 'yMMM'
        };
        this.primaryYAxis = {
            crosshairTooltip: { enable: true }
        };
        this.crosshair = { enable: true };
        this.series1 = ChartData.prototype.getCrosshairData().series1;
        this.legend = { visible: true };
        this.title = 'Weather Condition';
    }

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

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

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Customization

The fill and textStyle property of the crosshairTooltip is used to customize the background color and font style of the crosshair label respectively. Color and width of the crosshair line can be customized by using the line property in the crosshair.

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

@Component({
    selector: 'app-container',
    template:
    `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [legendSettings]='legend' [crosshair]='crosshair'>
        <e-series-collection>
            <e-series [dataSource]='series1' type='Line' xName='x' yName='y' name='Temperature'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis: Object;
    public series1: Object[];
    public crosshair: Object;
    public title: string;
    public primaryYAxis: Object;
    public legend: Object;
    ngOnInit(): void {
        this.primaryXAxis = {
            valueType: 'DateTime',
            crosshairTooltip: { enable: true, fill: 'green' },
            labelFormat: 'yMMM'
        };
        this.primaryYAxis = {
            crosshairTooltip: { enable: true, fill: 'green' }
        };
        this.crosshair = { enable: true, line: {width: 2, color: 'green'}, fill: 'green' };
        this.series1 = ChartData.prototype.getCrosshairData().series1;
        this.series2 = ChartData.prototype.getCrosshairData().series2;
        this.legend = { visible: true};
        this.title = 'Weather Condition';
    }

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

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

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Note: To use crosshair feature, we need to inject CrosshairService into the NgModule.providers.

Trackball

Trackball is used to track a data point closest to the mouse or touch position. Trackball marker indicates the closest point and trackball tooltip displays the information about the point. To use trackball feature, we need to inject CrosshairService and TooltipService into the NgModule.providers.

Trackball can be enabled by setting the enable property of the crosshair to true and shared property in tooltip to true in chart.

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

@Component({
    selector: 'app-container',
    template:
    `<ejs-chart id="chart-container" [primaryXAxis]='primaryXAxis'[primaryYAxis]='primaryYAxis' [title]='title' [crosshair]='crosshair' [tooltip]='tooltip'>
        <e-series-collection>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y' name='John' width=2 [marker]='marker'></e-series>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y1' name='Andrew' width=2 [marker]='marker'></e-series>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y2' name='Thomas' width=2 [marker]='marker'></e-series>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y3' name='Mark' width=2 [marker]='marker'></e-series>
            <e-series [dataSource]='chartData' type='Line' xName='x' yName='y4' name='William' width=2 [marker]='marker'></e-series>
        </e-series-collection>
    </ejs-chart>`
})
export class AppComponent implements OnInit {
    public primaryXAxis: Object;
    public chartData: Object[];
    public crosshair: Object;
    public title: string;
    public tooltip: Object;
    public marker: Object;
    ngOnInit(): void {
        this.chartData = [
            { x: new Date(2000, 2, 11), y: 15, y1: 39, y2: 60, y3: 75, y4: 85 },
            { x: new Date(2000, 9, 14), y: 20, y1: 30, y2: 55, y3: 75, y4: 83 },
            { x: new Date(2001, 2, 11), y: 25, y1: 28, y2: 48, y3: 68, y4: 85 },
            { x: new Date(2001, 9, 16), y: 21, y1: 35, y2: 57, y3: 75, y4: 87 },
            { x: new Date(2002, 2, 7), y: 13, y1: 39, y2: 62, y3: 71, y4: 82 },
            { x: new Date(2002, 9, 7), y: 18, y1: 41, y2: 64, y3: 69, y4: 74 },
            { x: new Date(2003, 2, 11), y: 24, y1: 45, y2: 57, y3: 81, y4: 73 },
            { x: new Date(2003, 9, 14), y: 23, y1: 48, y2: 53, y3: 84, y4: 75 },
            { x: new Date(2004, 2, 6), y: 19, y1: 54, y2: 63, y3: 85, y4: 73 },
            { x: new Date(2004, 9, 6), y: 31, y1: 55, y2: 50, y3: 87, y4: 60 },
            { x: new Date(2005, 2, 11), y: 39, y1: 57, y2: 66, y3: 75, y4: 48 },
            { x: new Date(2005, 9, 11), y: 50, y1: 60, y2: 65, y3: 70, y4: 55 },
            { x: new Date(2006, 2, 11), y: 24, y1: 60, y2: 79, y3: 85, y4: 40 }
        ];
        this.primaryXAxis = {
            title: 'Years',
            minimum: new Date(2000, 1, 1), maximum: new Date(2006, 2, 11),
            intervalType: 'Years',
            valueType: 'DateTime',
        };
        this.tooltip = { enable: true, shared: true, format: '${series.name} : ${point.x} : ${point.y}' };
        this.crosshair = { enable: true, lineType: 'Vertical' };
        this.marker = { visible: true };
        this.title = 'Average Sales per Person';
    }

}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { ChartModule } from '@syncfusion/ej2-angular-charts';
import { DateTimeService, LineSeriesService } from '@syncfusion/ej2-angular-charts';
import { LegendService, DataLabelService, TooltipService, CrosshairService } from '@syncfusion/ej2-angular-charts';

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

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

To known about Crosshair and Trackball, you can check on this video: