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Pointers in Blazor Linear Gauge component

14 Apr 2021 / 6 minutes to read

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

@using Syncfusion.Blazor.LinearGauge

<SfLinearGauge>
    <LinearGaugeAxes>
        <LinearGaugeAxis>
            <LinearGaugePointers>
                <LinearGaugePointer Value="80">
                </LinearGaugePointer>
            </LinearGaugePointers>
        </LinearGaugeAxis>
    </LinearGaugeAxes>
</SfLinearGauge>

Linear Gauge with Pointer Sample

Types of pointer

The Linear Gauge supports the following two types of pointers:

Bar
Marker

You can choose any pointer using the MarkerType property.

Marker pointer

A marker pointer is a shape that can be placed to mark the pointer value in the linear gauge.

Types of marker shapes

The following marker types are available in linear gauge. You can change the marker shape using the MarkerType property in LinearGaugePointer options.

Circle
Rectangle
Triangle
InvertedTriangle
Diamond
Image

You can also use an image instead of rendering a shape as pointer. It can be achieved by setting the MarkerType property to Image and setting image path to ImageUrl in LinearGaugePointer.

@using Syncfusion.Blazor.LinearGauge

<SfLinearGauge>
<LinearGaugeAxes>
    <LinearGaugeAxis>
        <LinearGaugePointers>
            <LinearGaugePointer Value="60" MarkerType="MarkerType.Circle">
            </LinearGaugePointer>
        </LinearGaugePointers>
    </LinearGaugeAxis>
</LinearGaugeAxes>
</SfLinearGauge>

Linear Gauge with MarkerType as circle Sample

Marker pointer customization

The marker pointer can be customized using following properties.

Height - Specifies pointer height
[Position] - Specifies the Position of the Pointers. Its Possible values are ‘Position.Inside’, ‘Position.Outside’ and ‘Position.Cross’
Width - Specifies pointer width
Color - Specifies pointer color
Placement - Specifies pointer placement position, available placement options are ‘Near’, ‘Far’, ‘Center’ and ‘None’
Offset - Specifies offset value from it default position.
Opacity - Specifies pointer opacity
AnimationDuration - Specifies pointer animation duration
LinearGaugePointerBorder - Specifies pointer border color and width

@using Syncfusion.Blazor.LinearGauge

<SfLinearGauge>
<LinearGaugeAxes>
    <LinearGaugeAxis>
        <LinearGaugePointers>
            <LinearGaugePointer Value="60"
                                MarkerType="MarkerType.Circle"
                                Height="15"
                                Width="15"
                                Position="Position.Outside"
                                Color="#cd41f4">
            </LinearGaugePointer>
        </LinearGaugePointers>
    </LinearGaugeAxis>
</LinearGaugeAxes>
</SfLinearGauge>

Linear Gauge with Marker pointer customization Sample

Bar pointer

The bar pointer is used to track the axis value, and it is rendered depending upon the container type. The bar pointer starts from the beginning of the gauge and ends at the pointer value. To enable bar pointer set ‘Point.Bar’ value in Type property.

@using Syncfusion.Blazor.LinearGauge

<SfLinearGauge>
<LinearGaugeAxes>
    <LinearGaugeAxis>
        <LinearGaugePointers>
            <LinearGaugePointer Value="60" Type="Point.Bar">
            </LinearGaugePointer>
        </LinearGaugePointers>
    </LinearGaugeAxis>
</LinearGaugeAxes>
</SfLinearGauge>

Linear Gauge with Bar pointer Sample

Bar pointer customization

The bar pointer can be customized using following properties.

Width - Specifies bar pointer width
Color - Specifies bar pointer color
Offset - Helps to move the bar pointer from its default position.
Opacity - Specifies bar pointer opacity
RoundedCornerRadius - Specifies rounded corner for the bar pointer
LinearGaugePointerBorder - Specifies bar pointer border width and color
AnimationDuration - Specifies animation duration for bar pointer

@using Syncfusion.Blazor.LinearGauge

<SfLinearGauge>
<LinearGaugeAxes>
    <LinearGaugeAxis>
        <LinearGaugePointers>
            <LinearGaugePointer Value="80"
                                Type="Point.Bar"
                                Width="20"
                                Color="#f44141">
            </LinearGaugePointer>
        </LinearGaugePointers>
    </LinearGaugeAxis>
</LinearGaugeAxes>
</SfLinearGauge>

Linear Gauge with Bar Pointer customization Sample

Pointer placement

You can placement the marker pointer in any of the following locations using Placement property.

Far
Near
Center
None

@using Syncfusion.Blazor.LinearGauge

<SfLinearGauge>
<LinearGaugeAxes>
    <LinearGaugeAxis>
        <LinearGaugePointers>
            <LinearGaugePointer Value="60"
                                MarkerType="MarkerType.Arrow"
                                Color="#cd41f4"
                                Placement="Placement.Near">
            </LinearGaugePointer>
        </LinearGaugePointers>
    </LinearGaugeAxis>
</LinearGaugeAxes>
</SfLinearGauge>

Marker pointer placement

Multiple pointers

In addition to the default pointer, you can add n number of pointers to an axis.

@using Syncfusion.Blazor.LinearGauge

<SfLinearGauge>
<LinearGaugeAxes>
    <LinearGaugeAxis>
        <LinearGaugePointers>
            <LinearGaugePointer Value="30" MarkerType="MarkerType.Circle">
            </LinearGaugePointer>
            <LinearGaugePointer Value="60" MarkerType="MarkerType.Diamond">
            </LinearGaugePointer>
            <LinearGaugePointer Value="80" AnimationDuration="1000">
            </LinearGaugePointer>
        </LinearGaugePointers>
    </LinearGaugeAxis>
</LinearGaugeAxes>
</SfLinearGauge>

Linear Gauge with Multiple Pointers Sample

Pointer animation

Pointer is animated on loading the gauge. This can be handled using the AnimationDuration property. You need to specify the duration of the animation in milliseconds.

@using Syncfusion.Blazor.LinearGauge

<SfLinearGauge>
<LinearGaugeAxes>
    <LinearGaugeAxis>
        <LinearGaugePointers>
            <LinearGaugePointer Value="80" AnimationDuration="1000">
            </LinearGaugePointer>
        </LinearGaugePointers>
    </LinearGaugeAxis>
</LinearGaugeAxes>
</SfLinearGauge>

Linear gauge with pointer animation

Pointer dragging

You can drag either marker or bar pointer to the desired axis value using the EnableDrag property in the LinearGaugePointer.

@using Syncfusion.Blazor.LinearGauge

<SfLinearGauge>
<LinearGaugeAxes>
    <LinearGaugeAxis>
        <LinearGaugePointers>
            <LinearGaugePointer Value="80" EnableDrag="true">
            </LinearGaugePointer>
        </LinearGaugePointers>
    </LinearGaugeAxis>
</LinearGaugeAxes>
</SfLinearGauge>

Drag linear gauge pointer

Gradient Color

Gradient support allows to add multiple colors in the ranges and 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 applied to all pointer types like marker and range bar. To do so, follow the below code sample.

@using Syncfusion.Blazor.LinearGauge

<SfLinearGauge Orientation="Orientation.Horizontal">
    <LinearGaugeContainer Width="30" Offset="30">
        <LinearGaugeContainerBorder Width="0"/>
        <LinearGaugeAxes>
            <LinearGaugeAxis>
                <LinearGaugeAxisLabelStyle Offset="55">
                    <LinearGaugeAxisLabelFont Color="#424242"/>
                </LinearGaugeAxisLabelStyle>
                <LinearGaugeLine Width="0.01"/>
                <LinearGaugeMajorTicks Height="0.01" Interval="25"/>
                <LinearGaugeMinorTicks Height="0.01"/>
                <LinearGaugePointers>
                    <LinearGaugePointer Value="80" Height="25" Width="35" Offset="-40" MarkerType="MarkerType.Triangle"
                    Placement="Syncfusion.Blazor.LinearGauge.Placement.Near" LinearGradient="@PointerLinearModel">
                    </LinearGaugePointer>
                </LinearGaugePointers>
                <LinearGaugeRanges>
                    <LinearGaugeRange Color="#f54ea2" Start="0" End="80" StartWidth="30" EndWidth="30" Offset="30">
                    </LinearGaugeRange>
                </LinearGaugeRanges>
            </LinearGaugeAxis>
        </LinearGaugeAxes>
    </LinearGaugeContainer>
</SfLinearGauge>
@code {
public static LinearGradient PointerLinearModel = new LinearGradient() {
    StartValue = "1%",
    EndValue = "99%",
    ColorStop = new List<ColorStop>() {
        new ColorStop { Opacity=1, Color= "#fef3f9", Offset="1%" },
        new ColorStop { Opacity=1, Color= "#f54ea2", Offset="100%" }
    }
};
}

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 applied to all pointer types like marker and range bar. To do so, follow the below code sample.

@using Syncfusion.Blazor.LinearGauge

<SfLinearGauge Orientation="Orientation.Horizontal">
    <LinearGaugeContainer Width="30" Offset="30">
        <LinearGaugeContainerBorder Width="0"/>
        <LinearGaugeAxes>
            <LinearGaugeAxis>
                <LinearGaugeAxisLabelStyle Offset="55">
                    <LinearGaugeAxisLabelFont Color="#424242"/>
                </LinearGaugeAxisLabelStyle>
                <LinearGaugeLine Width="0.01"/>
                <LinearGaugeMajorTicks Height="0.01" Interval="25"/>
                <LinearGaugeMinorTicks Height="0.01"/>
                <LinearGaugePointers>
                    <LinearGaugePointer Value="80" Height="25" Width="35" Offset="-40" MarkerType="MarkerType.Triangle"
                    Placement="Syncfusion.Blazor.LinearGauge.Placement.Near" RadialGradient="@PointerRadialModel">
                    </LinearGaugePointer>
                </LinearGaugePointers>
                <LinearGaugeRanges>
                    <LinearGaugeRange Color="#f54ea2" Start="0" End="80" StartWidth="30" EndWidth="30" Offset="30">
                    </LinearGaugeRange>
                </LinearGaugeRanges>
            </LinearGaugeAxis>
        </LinearGaugeAxes>
    </LinearGaugeContainer>
</SfLinearGauge>
@code {
public static RadialGradient PointerRadialModel = new RadialGradient()
{
    Radius = "60%",
    OuterPosition = new OuterPosition() { X="50%", Y="50%" },
    InnerPosition = new InnerPosition() { X="50%", Y="50%" },
    ColorStop = new List<ColorStop>() {
        new ColorStop { Opacity=0.9, Color= "#fff5f5", Offset="1%" },
        new ColorStop { Opacity=0.8, Color= "#f54ea2", Offset="99%" }
    }
};
}

Contents

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

Contents

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

Please provide additional information

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