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Pointers in JavaScript Linear Gauge control

15 Oct 2021 / 7 minutes to read

Pointers are used to indicate values on an axis. The value of the pointer can be modified using the value property in pointers.

Source

Preview

index.ts

index.html

import { LinearGauge } from '@syncfusion/ej2-lineargauge';
let gauge: LinearGauge = new LinearGauge({
    axes: [{
        pointers: [{
            value: 80
        }]
    }]
}, '#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>
</head>

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

</html>

Types of pointer

The Linear Gauge supports the following types of pointers:

Bar
Marker

The type of pointer can be modified by using the type property in pointers.

Marker pointer

A marker pointer is a shape that can be used to mark the pointer value in the Linear Gauge.

Types of marker shapes

By default, the marker shape for the pointer is InvertedTriangle. To change the shape of the pointer, use the markerType property in pointers. The following marker types are available in Linear Gauge.

Circle
Rectangle
Triangle
InvertedTriangle
Diamond
Image

An image can be rendered instead of rendering a shape as a pointer. It can be achieved by setting the markerType property to Image and setting the source URL of image to imageUrl property in pointers.

Source

Preview

index.ts

index.html

import { LinearGauge } from '@syncfusion/ej2-lineargauge';
let gauge: LinearGauge = new LinearGauge({
axes: [{
    pointers: [{
        value: 80,
        type: 'Marker',
        markerType: 'Circle'
    }]
}]
}, '#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>
</head>

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

</html>

Marker Pointer Customization

The marker pointer can be customized using the following properties.

height - To set the height of the pointer.
position - The position of the pointer can be changed by setting the value as Inside, Outside, Cross, or Auto.
width - To set the width of the pointer.
color - To set the color of the pointer.
placement - To place the pointer in the specified position. By default, the pointer is placed Far from the axis. To change the placement, set the placement property as Near, Center, or None.
offset - To place the pointer with specified distance from the axis.
opacity - To set the opacity of the pointer.
animationDuration - To specify the duration of the animation in pointer.
border - To set the color and width for the border of the pointer.

Source

Preview

index.ts

index.html

import { LinearGauge } from '@syncfusion/ej2-lineargauge';
let gauge: LinearGauge = new LinearGauge({
axes: [{
    pointers: [{
        value: 80,
        markerType: 'Circle',
        height: 15,
        width: 15,
        color: '#cd41f4'
    }]
}]
}, '#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>
</head>

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

</html>

Bar Pointer

The bar pointer is used to track the axis value. The bar pointer starts from the beginning of the gauge and ends at the pointer value. To enable bar pointer set the type property property in pointer as Bar.

Source

Preview

index.ts

index.html

import { LinearGauge } from '@syncfusion/ej2-lineargauge';
let gauge: LinearGauge = new LinearGauge({
axes: [{
    pointers: [{
        value: 60,
        type: 'Bar'
    }]
}]
}, '#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>
</head>

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

</html>

Bar pointer customization

The bar pointer can be customized using following properties.

width - To set the thickness of the bar pointer.
color - To set the color of the bar pointer.
offset - To place the bar pointer with the specified distance from it’s default position.
opacity - To set the opacity of the bar pointer.
roundedCornerRadius - To set the corner radius for the bar pointer.
border - To set the color and width for the border of the pointer.
animationDuration - To set the duration of the animation in bar pointer.

Note: The placement property is not applicable for the bar pointer.

Source

Preview

index.ts

index.html

import { LinearGauge } from '@syncfusion/ej2-lineargauge';
let gauge: LinearGauge = new LinearGauge({
axes: [{
    pointers: [{
        value: 60,
        type: 'Bar',
        width: 20,
        color: '#f44141'
    }]
}]
}, '#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>
</head>

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

</html>

Multiple pointers

Multiple pointers can be added to the Linear Gauge by adding multiple pointer objects in the pointers and customization for the pointers can be done with the pointer object.

Source

Preview

index.ts

index.html

import { LinearGauge } from '@syncfusion/ej2-lineargauge';
let gauge: LinearGauge = new LinearGauge({
axes: [{
    pointers: [
        {
            value: 80
        },
        {
            value: 60,
            markerType: 'Circle'
        },
        {
            value: 30,
            markerType: 'Diamond'
        }
        ]
    }]
}, '#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>
</head>

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

</html>

Pointer animation

Pointer is animated on loading the gauge. This can be handled using the animationDuration property. The duration of the animation can be specified in milliseconds.

Source

Preview

index.ts

index.html

import { LinearGauge } from '@syncfusion/ej2-lineargauge';
let gauge: LinearGauge = new LinearGauge({
axes: [{
    pointers: [{
        value: 60,
        animationDuration: 1000
    }]
}]
}, '#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>
</head>

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

</html>

Gradient Color

Gradient support allows the addition of multiple colors in the pointers of the Linear Gauge. The following gradient types are supported in the Linear Gauge.

Linear Gradient
Radial Gradient

Linear Gradient

Using linear gradient, colors will be applied in a linear progression. The start value of the linear gradient can be set using the startValue property. The end value of the linear gradient will be set using the endValue property. The color stop values such as color, opacity, and offset are set using colorStop property. The linear gradient can be rendered for the pointer in the Linear Gauge by using the below example.

Source

Preview

index.ts

index.html

import { LinearGauge, Gradient } from '@syncfusion/ej2-lineargauge';
LinearGauge.Inject(Gradient);
let gauge: LinearGauge = new LinearGauge({
orientation: 'Horizontal',
container: {
    width: 30, offset: 30
},
axes: [{
    line: { width: 0 },
    majorTicks: { height: 0, interval: 25 },
    minorTicks: { height: 0 },
    labelStyle: {
        font: { color: '#424242',
        }, offset: 55
    },
    pointers: [{
        value: 80, height: 25,
        width: 35, placement: 'Near',
        offset: -44, markerType: 'Triangle',
        color : '#f54ea2',
        linearGradient: {
            startValue: '0%',
            endValue: '100%',
            colorStop: [
                { color: '#fef3f9', offset: '0%', opacity: 1 },
                { color: '#f54ea2', offset: '100%', opacity: 1 }]
        }
    }],
    ranges: [{
        start: 0, end: 80,
        startWidth: 30, endWidth: 30,
        color:  '#f54ea2', offset: 30,
    }]
}]
}, '#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>
</head>

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

</html>

Radial Gradient

Using radial gradient, colors will be applied in circular progression. The inner circle position of the radial gradient will be set using the innerPosition property. The outer circle position of the radial gradient can be set using the outerPosition property. The color stop values such as color, opacity, and offset are set using colorStop property. The radial gradient can be rendered for the pointer in the Linear Gauge by using the below example.

Source

Preview

index.ts

index.html

import { LinearGauge, Gradient } from '@syncfusion/ej2-lineargauge';
LinearGauge.Inject(Gradient);
let gauge: LinearGauge = new LinearGauge({
orientation: 'Horizontal',
container: {
    width: 30, offset: 30
},
axes: [{
    line: { width: 0 },
    majorTicks: { height: 0, interval: 25 },
    minorTicks: { height: 0 },
    labelStyle: {
        font: { color: '#424242',
        }, offset: 55
    },
    pointers: [{
        value: 80, height: 25,
        width: 35, placement: 'Near',
        offset: -44, markerType: 'Triangle',
        color : '#f54ea2',
        radialGradient: {
            radius: '60%',
            outerPosition: { x: '50%', y: '50%' },
            innerPosition: { x: '50%', y: '50%' },
            colorStop: [
                { color: '#fff5f5', offset: '0%', opacity: 0.9 },
                { color: '#f54ea2', offset: '100%', opacity: 0.8 }]
        }
    }],
    ranges: [{
        start: 0, end: 80,
        startWidth: 30, endWidth: 30,
        color:  '#f54ea2', offset: 30,
    }]
}]
}, '#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>
</head>

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

</html>

Note: If we set both gradients, only the linear gradient gets rendered. If we set the startValue and endValue of the linearGradient as empty strings, then the radial gradient gets rendered in the pointer of the Linear Gauge.

Contents

Types of pointer
Marker pointer
Bar Pointer
Multiple pointers
Pointer animation
Gradient Color
Linear Gradient
Radial Gradient

Contents

Types of pointer
Marker pointer
Bar Pointer
Multiple pointers
Pointer animation
Gradient Color
Linear Gradient
Radial Gradient