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Getting Started

  • The ASP.NET Circular Gauge provides support to display the CircularGauge within your web page and allows you to customize it. This section encompasses the details on how to configure Circular Gauge.
  • You will learn how to provide data for a Circular Gauge and to display that data in the required way. In addition, you will learn how to customize the default Circular Gauge appearance to your requirements.
  • As a result, you will get a Circular Gauge that shows how the Automobile speedometer works with rpm (Rotation per Minute), kph (Kilometer per hour) and denotes the speed level indication (Safe, Caution and Danger).

Speedometer Gauge

Create a Circular Gauge

ASP.NET Circular Gauge widget basically renders with animation and flexible API’s. You can easily create the Circular Gauge widget by using simple code example as follows.

  1. First create an ASP Project and adding necessary Dll’s and Scripts with the help of the given ASP-Getting Started Documentation.

  2. Configure web.config files for assemblies

    • The following assemblies references are added properly in web.config file.
    	
     <compilation debug="true" targetFramework="4.5">
		
         <assemblies>
			
             <add assembly="Syncfusion.EJ.Web, Version=12.2450.0.36, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89"/>
				
             <add assembly="Syncfusion.EJ, Version=12.2450.0.36, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89"/>
				
         </assemblies>
			
     </compilation>	
		
     <httpRuntime targetFramework="4.5" />
		
     <pages> 
		
         <controls>
			
             <add namespace="Syncfusion.JavaScript.Web" assembly="Syncfusion.EJ.Web, Version=12.2450.0.36, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89" tagPrefix="ej"/>
				
             <add namespace="Syncfusion.JavaScript.Web" assembly="Syncfusion.EJ, Version=12.2450.0.36, Culture=neutral, PublicKeyToken=3d67ed1f87d44c89" tagPrefix="ej"/>
				
             <add  namespace="Syncfusion.JavaScript.DataVisualization.Models" assembly="Syncfusion.EJ" tagPrefix="ej"/>
				
         </controls>
			
     </pages>
  3. Adding Script Reference,

By default, Syncfusion JavaScript source files has been included into the EJ.Web assembly as an embedded source. So we no need to refer jQuery and Syncfusion scripts externally. For debugging purpose want to refer script files externally, set false to LoadEJResourcesFromAssembly in Web.config file as shows in the below image and refer jQuery and Syncfusion script files.

  • HTML
    • <!--  jquery script  -->
    <script src="http://cdn.syncfusion.com/js/assets/external/jquery-1.10.2.min.js"></script>

    <!-- Essential JS UI widget -->
    <script src="http://cdn.syncfusion.com/33.1.44/js/web/ej.web.all.min.js"></script>

    NOTE

    If you are using the Essential Studio below 13.4.0.53 version, then you need to refer jQuery.globalize.js script file along with the above references to render the circular gauge control.

    1. Add the mentioned code to the corresponding designer page for Circular Gauge rendering.

           <ej:CircularGauge runat="server" ID="CircularGauge1">

     </ej:CircularGauge>

    Run the above code to get a default CircularGauge with default values as follows.

    Set Height and Width values

    Pointers have different height and width range so you can set the Height and Width of the gauge according to your requirements.Set the basic values of the gauge such as height and width of the canvas element.

    Code:

  • HTML
    • <ej:CircularGauge runat="server" ID="CircularGauge1" Height="500" Width="500">

</ej:CircularGauge>

    Run the above code to get the following output.

    Set Background Color

    You can draw the speedometer with dark BackgroundColor and to vary the speed of the pointer you can set ReadOnly to ‘false’ for user Interaction.

    Code:

  • HTML
    • <ej:CircularGauge runat="server" ID="CircularGauge1" Height="500" Width="500" BackgroundColor="#3D3F3D" ReadOnly="false">

</ej:CircularGauge>

    Run the above code to get the following output.

    Provide scale values

    • The Scales values specifies the pointers, ticks, labels, indicators and ranges of Circular Gauge.
    • The PointerCap can be customized with the following options. Cap Radius, cap BorderColor, cap BackgroundColor, pointer cap BorderWidth are some of the properties that are customizable.
    • The speed limit in the gauge has maximum value of 200 kph. So you can set Maximum value for the gauge as 200.
    • Major Ticks have the MajorIntervalValue of 20 and minor ticks have the MinorIntervalValue of 5. ShowRanges and ShowIndicators are used to display the ranges and indicators in their respective positions.

    Code:

  • HTML
    • <ej:CircularGauge runat="server" ID="CircularGauge1" Height="500" Width="500" BackgroundColor="#3D3F3D" ReadOnly="false">

<Scales>

<ej:CircularScales ShowRanges="true" ShowIndicators="true"

Maximum="200" MajorIntervalValue="20" MinorIntervalValue="5">

<PointerCap Radius="15" BackgroundColor="#797C79"

BorderColor="#797C79" BorderWidth="0">

</PointerCap>

</ej:CircularScales>

</Scales>

</ej:CircularGauge>

    Run the above code to get the following output.

    Add Label Customization

    To display the value around the scales, Labels are used. By customizing the label Color it displays as specified.

    Code:

  • HTML
    • <ej:CircularGauge runat="server" ID="CircularGauge1" Height="500" Width="500" BackgroundColor="#3D3F3D" ReadOnly="false">

<Scales>

<ej:CircularScales ShowRanges="true" ShowIndicators="true"

Maximum="200" MajorIntervalValue="20" MinorIntervalValue="5">

<PointerCap Radius="15" BackgroundColor="#797C79"

BorderColor="#797C79" BorderWidth="0">

</PointerCap>

<%--Add the labels customization code here-- %>

<LabelCollection>

<ej:CircularLabels Color="#FFFFFF"></ej:CircularLabels>

</LabelCollection>

<%--Add the pointers customization code here-- %>

<%--Add the ticks customization code here-- %>

<%--Add the ranges customization code here-- %>

<%--Add the indicators customization code here-- %>

<%--Add the Custom labels customization code here-- %>

</ej:CircularScales>

</Scales>

</ej:CircularGauge>

    Run the above code to get the following output.

    Add pointers data

    Here, you have three Pointers that denote the kilometer value, rotation per minute value and torque value.The torque value pointer needs not be similar to the other two pointers. You can set torque pointer as marker pointer. And you can set other attributes for pointer such as Value, ShowBackNeedle, Type, MarkerType, NeedleType, BackgroundColor, Border Color, Length, Width, Radius and DistanceFromScale.

    Code:

  • HTML
    • <ej:CircularGauge runat="server" ID="CircularGauge1" Height="500" Width="500" BackgroundColor="#3D3F3D" ReadOnly="false">

<Scales>

<ej:CircularScales ShowRanges="true" ShowIndicators="true"

Maximum="200" MajorIntervalValue="20" MinorIntervalValue="5">

<PointerCap Radius="15" BackgroundColor="#797C79"

BorderColor="#797C79" BorderWidth="0">

</PointerCap>

<%--Add the labels customization code here-- %>

<%--Add the pointers customization code here-- %>

<PointerCollection>

<ej:Pointers Value="140" DistanceFromScale="60"

ShowBackNeedle="false" Length="20" Type="Marker"

MarkerType="Triangle" Width="10" BackgroundColor="#FF940A">

<Border Color="#FF940A"/>

</ej:Pointers>

<ej:Pointers Value="110" ShowBackNeedle="false" Length="150"

NeedleType="Rectangle" Width="2" BackgroundColor="#05AFFF">

<Border Color="#05AFFF"/>

</ej:Pointers>

<ej:Pointers Value="67" ShowBackNeedle="false" Length="100"

Width="15" BackgroundColor="#FC5D07">

<Border Color="#FC5D07"/>

</ej:Pointers>

</PointerCollection>

<%--Add the ticks customization code here-- %>

<%--Add the ranges customization code here-- %>

<%--Add the indicators customization code here-- %>

<%--Add the Custom labels customization code here-- %>

</ej:CircularScales>

</Scales>

</ej:CircularGauge>

    Run the above code to get the following output.

    Add Ticks Details

    • You can set Major Ticks with their Width and Height equal to Minor Ticks.
    • You can set Color according to your preference for better visibility in dark backgrounds.
    • You can specify the tick Type either major or minor type tick and DistanceFromScale values.
    • To display and customize the tick value add the following code example.

    Code:

  • HTML
    • <ej:CircularGauge runat="server" ID="CircularGauge1" Height="500" Width="500" BackgroundColor="#3D3F3D" ReadOnly="false">

<Scales>

<ej:CircularScales ShowRanges="true" ShowIndicators="true"

Maximum="200" MajorIntervalValue="20" MinorIntervalValue="5">

<PointerCap Radius="15" BackgroundColor="#797C79"

BorderColor="#797C79" BorderWidth="0">

</PointerCap>

<%--Add the labels customization code here-- %>

<%--Add the pointers customization code here-- %>

<%--Add the ticks customization code here-- %>

<TickCollection>

<ej:CircularTicks Type="Major" DistanceFromScale="70"

Height="20" Width="3" Color="#FFFFFF"/>

<ej:CircularTicks Type="Minor" DistanceFromScale="70"

Height="12" Width="1" Color="#FFFFFF" />

</TickCollection>

<%--Add the ranges customization code here-- %>

<%--Add the indicators customization code here-- %>

<%--Add the Custom labels customization code here-- %>

</ej:CircularScales>

</Scales>

</ej:CircularGauge>

    Run the above code to get the following output.

    Add Range Values

    • Ranges denote the property of the scale value in the speedometer. The color values of the Ranges denote speed variation. Set ShowRanges as true for showing the ranges in the Circular Gauge.
    • For Low speed, you can mention it as safe zone; for moderate speed, you can call it as caution zone and for high speed, you can mark it as high speed.
    • You can customize the range with properties such as StartValue, EndValue, StartWidth, EndWidth, BackgroundColor , Border Color, DistanceFromScale,etc.,

    Code:

  • HTML
    • <ej:CircularGauge runat="server" ID="CircularGauge1" Height="500" Width="500" BackgroundColor="#3D3F3D" ReadOnly="false">

<Scales>

<ej:CircularScales ShowRanges="true" ShowIndicators="true"

Maximum="200" MajorIntervalValue="20" MinorIntervalValue="5">

<PointerCap Radius="15" BackgroundColor="#797C79"

BorderColor="#797C79" BorderWidth="0">

</PointerCap>

<%--Add the labels customization code here-- %>

<%--Add the pointers customization code here-- %>

<%--Add the ticks customization code here-- %>

<%--Add the ranges customization code here-- %>

<RangeCollection>

<ej:CircularRanges DistanceFromScale="30" StartValue="0"

EndValue="70"

BackgroundColor="#5DF243">

<Border Color="#FFFFFF"/>

</ej:CircularRanges>

<ej:CircularRanges DistanceFromScale="30" StartValue="70"

EndValue="140"

BackgroundColor="#F6FF0A">

<Border Color="#FFFFFF"/>

</ej:CircularRanges>

<ej:CircularRanges DistanceFromScale="30" StartValue="140"

EndValue="200"

BackgroundColor="#FF1807">

<Border Color="#FFFFFF"/>

</ej:CircularRanges>

</RangeCollection>

<%--Add the indicators customization code here-- %>

<%--Add the Custom labels customization code here-- %>

</ej:CircularScales>

</Scales>

</ej:CircularGauge>

    Run the above code to get the following output.

    Add Indicator Details

    • Indicators denote whether the pointers values are in their respective zones or not. Positioning the Indicators on the respective range value gives you the required changes.
    • By using Position property, you can set the location of the indicator. You can also specify Height, Width and Type for indicators. StateRanges defines how the indicator should behave when the pointer is in certain values.
    • You can customize state ranges with properties like EndValue, StartValue, BackgroundColor, BorderColor, Text, TextColor, etc.

    Code:

  • HTML
    • <ej:CircularGauge runat="server" ID="CircularGauge1" Height="500" Width="500" BackgroundColor="#3D3F3D" ReadOnly="false">

<Scales>

<ej:CircularScales ShowRanges="true" ShowIndicators="true"

Maximum="200" MajorIntervalValue="20" MinorIntervalValue="5">

<PointerCap Radius="15" BackgroundColor="#797C79"

BorderColor="#797C79" BorderWidth="0">

</PointerCap>

<%--Add the labels customization code here-- %>

<%--Add the pointers customization code here-- %>

<%--Add the ticks customization code here-- %>

<%--Add the ranges customization code here-- %>

<%--Add the indicators customization code here-- %>

<IndicatorCollection>

<ej:CircularIndicators Type="Circle"

Height="10" Width="10">

<Position X="210" Y="300"/>

<StateRangeCollection>

<ej:CircularStateRanges StartValue="0" EndValue="70"

BackgroundColor="#5DF243" BorderColor="#5DF243">

</ej:CircularStateRanges>

<ej:CircularStateRanges StartValue="70" EndValue="200"

BackgroundColor="#145608" BorderColor="#145608">

</ej:CircularStateRanges>

</StateRangeCollection>

</ej:CircularIndicators>

<ej:CircularIndicators Type="Circle"

Height="10" Width="10">

<Position X="255" Y="200"/>

<StateRangeCollection>

<ej:CircularStateRanges StartValue="0" EndValue="70"

BackgroundColor="#969B0C" BorderColor="#969B0C">

</ej:CircularStateRanges>

<ej:CircularStateRanges StartValue="70" EndValue="140"

BackgroundColor="#F6FF0A" BorderColor="#F6FF0A">

</ej:CircularStateRanges>

<ej:CircularStateRanges StartValue="140" EndValue="200"

BackgroundColor="#969B0C" BorderColor="#969B0C">

</ej:CircularStateRanges>

</StateRangeCollection>

</ej:CircularIndicators>

<ej:CircularIndicators Type="Circle"

Height="10" Width="10">

<Position X="300" Y="300"/>

<StateRangeCollection>

<ej:CircularStateRanges StartValue="140" EndValue="200"

BackgroundColor="#FF1807" BorderColor="#FF1807">

</ej:CircularStateRanges>

<ej:CircularStateRanges StartValue="0" EndValue="140"

BackgroundColor="#890F06" BorderColor="#890F06">

</ej:CircularStateRanges>

</StateRangeCollection>

</ej:CircularIndicators>

</IndicatorCollection>

<%--Add the Custom labels customization code here-- %>

</ej:CircularScales>

</Scales>

</ej:CircularGauge>

    Run the above code to get the following output.

    Add Custom Label Details

    CustomLabels are used to specify the texts that need to be displayed in the gauge. You can customize it through various properties such as Value, Position, Color, Font Size, FontFamily and FontStyle. To display the three range description, custom texts are used here.

    Code:

  • HTML
    • <ej:CircularGauge runat="server" ID="CircularGauge1" Height="500" Width="500" BackgroundColor="#3D3F3D" ReadOnly="false">

<Scales>

<ej:CircularScales ShowRanges="true" ShowIndicators="true"

Maximum="200" MajorIntervalValue="20" MinorIntervalValue="5">

<PointerCap Radius="15" BackgroundColor="#797C79"

BorderColor="#797C79" BorderWidth="0">

</PointerCap>

<%--Add the labels customization code here-- %>

<%--Add the pointers customization code here-- %>

<%--Add the ticks customization code here-- %>

<%--Add the ranges customization code here-- %>

<%--Add the indicators customization code here-- %>

<%--Add the Custom labels customization code here-- %>

<CustomLabelCollection>

<ej:CircularCustomLabel Color="#5DF243" Value="Safe">

<Position X="200" Y="280"/>

<Font FontFamily="Arial" FontStyle="Bold"

Size="12px"></Font>

</ej:CircularCustomLabel>

<ej:CircularCustomLabel Color="#F6FF0A" Value="Caution">

<Position X="253" Y="212"/>

<Font FontFamily="Arial" FontStyle="Bold"

Size="12px"></Font>

</ej:CircularCustomLabel>

<ej:CircularCustomLabel Color="#FF1807" Value="Danger">

<Position X="290" Y="280"/>

<Font FontFamily="Arial" FontStyle="Bold"

Size="12px"></Font>

</ej:CircularCustomLabel>

</CustomLabelCollection>

</ej:CircularScales>

</Scales>

</ej:CircularGauge>

    The final output is as follows.