LinearGauge Quick Start

This section describes how to add a LinearGauge control to your portable or shared app and set its value. For information on how to add Xuni components in C# or XAML, see Adding Xuni Components using C# or Adding Xuni Components using XAML.

This topic comprises of two steps:

Step 1: Add a LinearGauge control
Step 2: Run the Project

The following image shows how the LinearGauge appears after completing the steps above:

Step 1: Add a LinearGauge control

The Value property denotes the value of the gauge. Multiple ranges can be added to a single Gauge and the position of the range is defined by the Min and Max properties of the range. If you set the Gauge's IsReadOnly property to false, then the user is able to edit the value by tapping on the gauge.

Note: XuniLinearGauge.Origin property can be used to change the origin of the LinearGauge pointer. By default, the Origin is set to 0.

Complete the following steps to initialize a LinearGauge control in C# or XAML.

In Code

Add a new class (for example QuickStart.cs) to your Portable or Shared project and include Xuni Gauge and Xamarin references as shown below.
C#
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using Xuni.Xamarin.Gauge; using Xamarin.Forms;

C#	Copy Code
using Xuni.Xamarin.Gauge; using Xamarin.Forms;

Instantiate a LinearGauge control in a new method GetLinearGauge().

C#	Copy Code
public static XuniLinearGauge GetLinearGauge() { // Instantiate LinearGauge and set its properties XuniLinearGauge gauge = new XuniLinearGauge(); gauge.HeightRequest = 50; gauge.WidthRequest = 50; gauge.Value = 35; gauge.Thickness = 0.1; gauge.Min = 0; gauge.Max = 100; gauge.Direction = LinearGaugeDirection.Right; gauge.PointerColor = Color.Blue; //Create Ranges GaugeRange low = new GaugeRange(); GaugeRange med = new GaugeRange(); GaugeRange high = new GaugeRange(); //Customize Ranges low.Color = Color.Red; low.Min = 0; low.Max = 40; med.Color = Color.Yellow; med.Min = 40; med.Max = 80; high.Color = Color.Green; high.Min = 80; high.Max = 100; //Add Ranges to Gauge gauge.Ranges.Add(low); gauge.Ranges.Add(med); gauge.Ranges.Add(high); return gauge; }

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public static XuniLinearGauge GetLinearGauge()
{
    // Instantiate LinearGauge and set its properties
    XuniLinearGauge gauge = new XuniLinearGauge();
    gauge.HeightRequest = 50;
    gauge.WidthRequest = 50;
    gauge.Value = 35;
    gauge.Thickness = 0.1;
    gauge.Min = 0;
    gauge.Max = 100;
    gauge.Direction = LinearGaugeDirection.Right;
    gauge.PointerColor = Color.Blue;

    //Create Ranges
    GaugeRange low = new GaugeRange();
    GaugeRange med = new GaugeRange();
    GaugeRange high = new GaugeRange();

    //Customize Ranges
    low.Color = Color.Red;
    low.Min = 0;
    low.Max = 40;
    med.Color = Color.Yellow;
    med.Min = 40;
    med.Max = 80;
    high.Color = Color.Green;
    high.Min = 80;
    high.Max = 100;

    //Add Ranges to Gauge
    gauge.Ranges.Add(low);
    gauge.Ranges.Add(med);
    gauge.Ranges.Add(high);

    return gauge;
}

In XAML

Add a new Forms XAML Page (for example QuickStart.xaml) to your Portable or Shared project and modify the <ContentPage> tag to include Xuni reference as shown below:

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<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="Appl.QuickStart" xmlns:xuni="clr-namespace:Xuni.Xamarin.Gauge;assembly=Xuni.Xamarin.Gauge">

XAML

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<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Appl.QuickStart"
xmlns:xuni="clr-namespace:Xuni.Xamarin.Gauge;assembly=Xuni.Xamarin.Gauge">

Initialize a LinearGauge control by adding the markup for the control between the <ContentPage></ContentPage> tags and inside the <StackLayout></StackLayout> tags, as shown below:

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<StackLayout> <xuni:XuniLinearGauge Value="35" Min="0" Max="100" Thickness="0.1" HeightRequest="50" WidthRequest="50" PointerColor="Blue" Direction="Right"> <xuni:XuniLinearGauge.Ranges> <xuni:GaugeRange Min="0" Max="40" Color="Red"/> <xuni:GaugeRange Min="40" Max="80" Color="Yellow"/> <xuni:GaugeRange Min="80" Max="100" Color="Green"/> </xuni:XuniLinearGauge.Ranges> </xuni:XuniLinearGauge> </StackLayout>

XAML

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<StackLayout>
  <xuni:XuniLinearGauge  Value="35" Min="0" Max="100" Thickness="0.1"
   HeightRequest="50" WidthRequest="50" PointerColor="Blue" Direction="Right">
    <xuni:XuniLinearGauge.Ranges>
      <xuni:GaugeRange Min="0" Max="40" Color="Red"/>
      <xuni:GaugeRange Min="40" Max="80" Color="Yellow"/>
      <xuni:GaugeRange Min="80" Max="100" Color="Green"/>
    </xuni:XuniLinearGauge.Ranges>
  </xuni:XuniLinearGauge>
</StackLayout>

Step 2: Run the Project

In the Solution Explorer, double click App.cs to open it.
Complete the following steps to display the LinearGauge control.
- To return a C# class: In the class constructor App(), set a new ContentPage as the MainPage and assign the control to the ContentPage's Content by invoking the method GetLinearGauge() defined in the previous procedure, Step 1: Add a LinearGauge Control.
  The following code shows the class constructor App() after completing steps above.
  C#
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  public App() { // The root page of your application MainPage = new ContentPage { Content = QuickStart.GetLinearGauge() }; }
- To return a Forms XAML Page: In the class constructor App(), set the Forms XAML Page QuickStart as the MainPage.
  The following code shows the class constructor App(), after completing this step.
  C#
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  public App() { // The root page of your application MainPage = new QuickStart(); }
Some additional steps are required to run the iOS and WinPhone apps:
- iOS App:
  1. In the Solution Explorer, double click AppDelegate.cs inside YourAppName.iOS project, to open it.
  2. Add the following code to the FinishedLaunching() method.
    C#
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    Xuni.Xamarin.Gauge.Platform.iOS.Forms.Init();
- WinPhone App:
  1. In the Solution Explorer, expand MainPage.xml.
  2. Double click MainPage.xml.cs to open it.
  3. Add the following code to the class constructor.
    C#
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    Xuni.Xamarin.Gauge.Platform.WinPhone.GaugeRenderer.Init();
Press F5 to run the project.
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