devexpress-examples/how-to-determine-whether-an-indicators-value-falls-into-a-particular-range-e3329

.NET, Silverlight, DXGauges for Silverlight

Files to look at:

• MainPage.xaml (VB: MainPage.xaml)
• MainPage.xaml.cs (VB: MainPage.xaml.vb)

How to determine whether an indicator's value falls into a particular range

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In some cases, you need to know whether or not the current value of an indicator belongs to a particular range. This example shows how to create a state indicator that changes its color depending on the current range.

Description

In this example, the Circular gauge is created with three ranges and two empty sections. Initially the gauge's needle doesn't belong to any range, so the state indicator is painted as a gray ellipse.

To solve this task it's necessary to handle the IndicatorEnter and IndicatorLeave events in the following way:
- if a needle 'enters' a range, it becomes painted with a range color;
- if a needle 'leaves' a range, it becomes painted in gray.

Note: In this example we set the IsInteractive property to True, so that you can click on a gauge and manually change the current needle value.