Trend lines in EJ2 TypeScript Chart control
13 Dec 202424 minutes to read
Trendlines are used to show the direction and speed of price.
Trendlines can be generated for Cartesian type series (Line, Column, Scatter, Area, Candle, Hilo etc.) except bar type series. You can add more than one trendline to a series.
Chart supports 6 types of trendlines.
Linear
A linear trendline is a best fit straight line that is used with simpler data sets. To render a linear trendline, use trendline type
as Linear
and inject Trendlines
module using Chart.Inject(Trendlines)
.
import { Chart, Category, Trendlines, ScatterSeries, SplineSeries, Tooltip, LineSeries, TrendlineTypes} from '@syncfusion/ej2-charts';
Chart.Inject(Chart, ScatterSeries, SplineSeries, LineSeries, Tooltip, Trendlines Category);
let data: Object[] = [];
let yValue: number[] = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
let point: Object;
let i: number; let j: number = 0;
for (i = 1973; i <= 2013; i++) {
point = { x: i, y: yValue[j] };
data.push(point);
j++;
}
let chart: Chart = new Chart({
primaryXAxis: {
title: 'Months',
},
primaryYAxis: {
title: 'Rupees against Dollars',
interval: 5
},
tooltip:{enable:true},
chartArea: { border: { width: 0 } },
series: [{
dataSource: data,
xName: 'x', yName: 'y',
name: 'Apple Inc',
fill: '#0066FF',
//Series type as scatter
type: 'Scatter',
trendlines: [{ type: 'Linear' }]
}],
title: 'Historical Indian Rupee Rate (INR USD)'
}, '#element');
<!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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
<div id='loader'>Loading....</div>
<div id='container'>
<div id='element'></div>
</div>
</body>
</html>
Exponential
An exponential trendline is a curved line that is most useful when data values rise or fall at increasingly higher rates. You cannot create an exponential trendline, if your data contains zero or negative values.
To render a exponential trendline, use trendline type
as Exponential
and inject Trendlines
module using Chart.Inject(Trendlines)
.
import { Chart, ScatterSeries,Trendlines, SplineSeries, Category, LineSeries, Tooltip, Crosshair, Legend, DateTime } from '@syncfusion/ej2-charts';
Chart.Inject(ScatterSeries, LineSeries, SplineSeries, Category, Tooltip, Crosshair, Trendlines, Legend, DateTime);
let data: Object[] = [];
let yValue: number[] = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
let point: Object;
let i: number; let j: number = 0;
for (i = 1973; i <= 2013; i++) {
point = { x: i, y: yValue[j] };
data.push(point);
j++;
}
let chart: Chart = new Chart({
primaryXAxis: {
title: 'Months',
},
primaryYAxis: {
title: 'Rupees against Dollars',
interval: 5
},
tooltip:{enable:true},
chartArea: { border: { width: 0 } },
series: [{
dataSource: data,
xName: 'x', yName: 'y',
name: 'Apple Inc',
fill: '#0066FF',
type: 'Scatter',
trendlines: [
{ type: 'Exponential',enableTooltip:true,marker:{visible:true} }
]
}],
title: 'Historical Indian Rupee Rate (INR USD)'
}, '#element');
<!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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
<div id='loader'>Loading....</div>
<div id='container'>
<div id='element'></div>
</div>
</body>
</html>
Logarithmic
A logarithmic trendline is a best-fit curved line that is most useful when the rate of change in the data increases or decreases quickly and then levels out. A logarithmic trendline can use negative and/or positive values.
To render a logarithmic trendline, use trendline type
as Logarithmic
and inject Trendlines
module using Chart.Inject(Trendlines)
.
import { Chart, Category, Trendlines, ScatterSeries, SplineSeries, LineSeries,Tooltip, TrendlineTypes} from '@syncfusion/ej2-charts';
Chart.Inject(Chart, ScatterSeries, SplineSeries, LineSeries, Trendlines, Tooltip, Category);
let data: Object[] = [];
let yValue: number[] = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
let point: Object;
let i: number; let j: number = 0;
for (i = 1973; i <= 2013; i++) {
point = { x: i, y: yValue[j] };
data.push(point);
j++;
}
let chart: Chart = new Chart({
primaryXAxis: {
title: 'Months',
},
primaryYAxis: {
title: 'Rupees against Dollars',
interval: 5
},
tooltip:{enable:true},
chartArea: { border: { width: 0 } },
series: [{
dataSource: data,
xName: 'x', yName: 'y',
name: 'Apple Inc',
fill: '#0066FF',
//Series type as scatter
type: 'Scatter',
trendlines: [{ type: 'Logarithmic' }]
}],
title: 'Historical Indian Rupee Rate (INR USD)'
}, '#element');
<!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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
<div id='loader'>Loading....</div>
<div id='container'>
<div id='element'></div>
</div>
</body>
</html>
Polynomial
A polynomial trendline is a curved line that is used when data fluctuates.
To render a polynomial trendline, use trendline type
as Polynomial
and inject Trendlines
module using Chart.Inject(Trendlines)
.
polynomialOrder
used to define the polynomial value.
import { Chart, Category, Trendlines, ScatterSeries, SplineSeries, LineSeries, Tooltip, TrendlineTypes} from '@syncfusion/ej2-charts';
Chart.Inject(Chart, ScatterSeries, SplineSeries, LineSeries, Trendlines, Tooltip, Category);
let data: Object[] = [];
let yValue: number[] = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
let point: Object;
let i: number; let j: number = 0;
for (i = 1973; i <= 2013; i++) {
point = { x: i, y: yValue[j] };
data.push(point);
j++;
}
let chart: Chart = new Chart({
primaryXAxis: {
title: 'Months',
},
primaryYAxis: {
title: 'Rupees against Dollars',
interval: 5
},
tooltip:{enable:true},
chartArea: { border: { width: 0 } },
series: [{
dataSource: data,
xName: 'x', yName: 'y',
name: 'Apple Inc',
fill: '#0066FF',
//Series type as scatter
type: 'Scatter',
trendlines: [{ type: 'Polynomial' }]
}],
title: 'Historical Indian Rupee Rate (INR USD)'
}, '#element');
<!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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
<div id='loader'>Loading....</div>
<div id='container'>
<div id='element'></div>
</div>
</body>
</html>
Power
A power trendline is a curved line that is best used with data sets that compare measurements that increase at a specific rate.
To render a power trendline, use trendline type
as Power
and inject Trendlines
module using Chart.Inject(Trendlines)
.
import { Chart, Category, Trendlines, ScatterSeries, SplineSeries, LineSeries, Tooltip, TrendlineTypes} from '@syncfusion/ej2-charts';
Chart.Inject(Chart, ScatterSeries, SplineSeries, LineSeries, Trendlines, Tooltip, Category);
let powerData: any[] = [
{ x: 1, y: 10 }, { x: 2, y: 50 },{ x: 3, y: 80 }, { x: 4, y: 110 },
{ x: 5, y: 180 }, { x: 6, y: 220 }, { x: 7, y: 300 }, { x: 8, y: 370 }, { x: 9, y: 490 }, { x: 10, y: 500 }
];
let chart: Chart = new Chart({
primaryXAxis: {
title: 'Months',
},
primaryYAxis: {
title: 'Rupees against Dollars',
interval: 50
},
tooltip:{enable:true},
chartArea: { border: { width: 0 } },
series: [{
dataSource: powerData,
xName: 'x', yName: 'y',
name: 'Apple Inc',
fill: '#0066FF',
//Series type as scatter
type: 'Scatter',
trendlines: [{ type: 'Power' }]
}],
title: 'Historical Indian Rupee Rate (INR USD)'
}, '#element');
<!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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
<div id='loader'>Loading....</div>
<div id='container'>
<div id='element'></div>
</div>
</body>
</html>
Moving average
A moving average trendline smoothen out fluctuations in data to show a pattern or trend more clearly.
To render a moving average trendline, use trendline type
as MovingAverage
and inject Trendlines
module using Chart.Inject(Trendlines)
.
period
property defines the period to find the moving average.
import { Chart, Category, Trendlines, ScatterSeries, SplineSeries, LineSeries, Tooltip, TrendlineTypes} from '@syncfusion/ej2-charts';
Chart.Inject(Chart, ScatterSeries, SplineSeries, LineSeries, Trendlines, Tooltip, Category);
let data: Object[] = [];
let yValue: number[] = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
let point: Object;
let i: number; let j: number = 0;
for (i = 1973; i <= 2013; i++) {
point = { x: i, y: yValue[j] };
data.push(point);
j++;
}
let chart: Chart = new Chart({
primaryXAxis: {
title: 'Months',
},
primaryYAxis: {
title: 'Rupees against Dollars',
interval: 5
},
tooltip:{enable:true},
chartArea: { border: { width: 0 } },
series: [{
dataSource: data,
xName: 'x', yName: 'y',
name: 'Apple Inc',
fill: '#0066FF',
//Series type as scatter
type: 'Scatter',
trendlines: [{ type: 'MovingAverage' }]
}],
title: 'Historical Indian Rupee Rate (INR USD)'
}, '#element');
<!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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
<div id='loader'>Loading....</div>
<div id='container'>
<div id='element'></div>
</div>
</body>
</html>
Customization of trendline
The fill
and width
properties are used to customize the appearance of the trendline.
import { Chart, Category, Trendlines, ScatterSeries, SplineSeries, Tooltip, LineSeries, TrendlineTypes} from '@syncfusion/ej2-charts';
Chart.Inject(Chart, ScatterSeries, SplineSeries, LineSeries, Trendlines, Tooltip, Category);
let data: Object[] = [];
let yValue: number[] = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
let point: Object;
let i: number; let j: number = 0;
for (i = 1973; i <= 2013; i++) {
point = { x: i, y: yValue[j] };
data.push(point);
j++;
}
let chart: Chart = new Chart({
primaryXAxis: {
title: 'Months',
},
primaryYAxis: {
title: 'Rupees against Dollars',
interval: 5
},
tooltip:{enable:true},
chartArea: { border: { width: 0 } },
series: [{
dataSource: data,
xName: 'x', yName: 'y',
name: 'Apple Inc',
fill: '#0066FF',
//Series type as scatter
type: 'Scatter',
trendlines: [{ type: 'MovingAverage', fill: 'red', width:2 }]
}],
title: 'Historical Indian Rupee Rate (INR USD)'
}, '#element');
<!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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
<div id='loader'>Loading....</div>
<div id='container'>
<div id='element'></div>
</div>
</body>
</html>
Forecasting
Trendline forecasting is the prediction of future/past situations.
Forward Forecasting and Backward Forecasting are the two types of forecasting.
Forward forecasting
The value set for forwardForecast is used to determine the distance moving towards the future trend.
import { Chart, Category, Trendlines, ScatterSeries, SplineSeries, Tooltip, LineSeries, TrendlineTypes} from '@syncfusion/ej2-charts';
Chart.Inject(Chart, ScatterSeries, SplineSeries, LineSeries, Trendlines, Tooltip, Category);
let data: Object[] = [];
let yValue: number[] = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
let point: Object;
let i: number; let j: number = 0;
for (i = 1973; i <= 2013; i++) {
point = { x: i, y: yValue[j] };
data.push(point);
j++;
}
let chart: Chart = new Chart({
primaryXAxis: {
title: 'Months',
},
primaryYAxis: {
title: 'Rupees against Dollars',
interval: 5
},
tooltip:{enable:true},
chartArea: { border: { width: 0 } },
series: [{
dataSource: data,
xName: 'x', yName: 'y',
name: 'Apple Inc',
fill: '#0066FF',
//Series type as scatter
type: 'Scatter',
trendlines: [{
type: 'Linear',
//forward forecast value
forwardForecast:5
}]
}],
title: 'Historical Indian Rupee Rate (INR USD)'
}, '#element');
<!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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
<div id='loader'>Loading....</div>
<div id='container'>
<div id='element'></div>
</div>
</body>
</html>
Backward forecasting
The value set for the backwardForecast is used to determine the past trends.
import { Chart, Category, Trendlines, ScatterSeries, SplineSeries, LineSeries, Tooltip, TrendlineTypes} from '@syncfusion/ej2-charts';
Chart.Inject(Chart, ScatterSeries, SplineSeries, LineSeries, Trendlines, Tooltip, Category);
let data: Object[] = [];
let yValue: number[] = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
let point: Object;
let i: number; let j: number = 0;
for (i = 1973; i <= 2013; i++) {
point = { x: i, y: yValue[j] };
data.push(point);
j++;
}
let chart: Chart = new Chart({
primaryXAxis: {
title: 'Months',
},
primaryYAxis: {
title: 'Rupees against Dollars',
interval: 5
},
tooltip:{enable:true},
chartArea: { border: { width: 0 } },
series: [{
dataSource: data,
xName: 'x', yName: 'y',
name: 'Apple Inc',
fill: '#0066FF',
//Series type as scatter
type: 'Scatter',
trendlines: [{
type: 'Linear',
//backward forecast value
backwardForecast: 5
}]
}],
title: 'Historical Indian Rupee Rate (INR USD)'
}, '#element');
<!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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
<div id='loader'>Loading....</div>
<div id='container'>
<div id='element'></div>
</div>
</body>
</html>
Show or hide a trendline
You can show or hide the trendline by setting trendline visible
property.
import { Chart, Category, Trendlines, ScatterSeries, SplineSeries, Tooltip, LineSeries, TrendlineTypes} from '@syncfusion/ej2-charts';
Chart.Inject(Chart, ScatterSeries, SplineSeries, LineSeries, Tooltip, Trendlines Category);
let data: Object[] = [];
let yValue: number[] = [7.66, 8.03, 8.41, 8.97, 8.77, 8.20, 8.16, 7.89, 8.68, 9.48, 10.11, 11.36, 12.34, 12.60, 12.95, 13.91, 16.21, 17.50, 22.72, 28.14, 31.26, 31.39, 32.43, 35.52, 36.36,
41.33, 43.12, 45.00, 47.23, 48.62, 46.60, 45.28, 44.01, 45.17, 41.20, 43.41, 48.32, 45.65, 46.61, 53.34, 58.53];
let point: Object;
let i: number; let j: number = 0;
for (i = 1973; i <= 2013; i++) {
point = { x: i, y: yValue[j] };
data.push(point);
j++;
}
let chart: Chart = new Chart({
primaryXAxis: {
title: 'Months',
},
primaryYAxis: {
title: 'Rupees against Dollars',
interval: 5
},
tooltip:{enable:true},
chartArea: { border: { width: 0 } },
series: [{
dataSource: data,
xName: 'x', yName: 'y',
name: 'Apple Inc',
fill: '#0066FF',
//Series type as scatter
type: 'Scatter',
trendlines: [{ visible: false }]
}],
title: 'Historical Indian Rupee Rate (INR USD)'
}, '#element');
<!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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
<div id='loader'>Loading....</div>
<div id='container'>
<div id='element'></div>
</div>
</body>
</html>