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This document gives the definition of a value indicator and also explains what types of value indicators exist and how they should be used in a Gauge control.
A Value Indicator is a dynamic gauge element that is used to track the changing of a data value or a data range on a scale. This value can be accessible via the ValueIndicatorBase.Value property of the ValueIndicatorBase class.
The ValueIndicatorBase.Value property of the value indicator can be changed not only programmatically, but also by end-users via mouse-clicks. This capability becomes available after setting the ValueIndicatorBase.IsInteractive property to true. For real-life examples on how this can be done, see the How to: Enable Indicator Value's Changing via a Mouse Click tutorial.
Depending on the type of a Scale, various kinds of value indicators can be used with it.
Arc Scale's Indicators
The following value indicators are appropriate for the Arc Scale.
|Needle||A needle-like element that is used to indicate a current value in a Circular Gauge.||ArcScaleNeedle||ArcScaleNeedleCollection||ArcScale.Needles|
|Marker||A Marker is a small pointer that indicates a fixed value.||ArcScaleMarker||ArcScaleMarkerCollection||ArcScale.Markers|
|Range Bar||A Range Bar is a filled sector that represents a specific interval (e.g. working hours).||ArcScaleRangeBar||ArcScaleRangeBarCollection||ArcScale.RangeBars|
Value indicators for the circular scale are shown in the image below:
Linear Scale's Indicators
In the Linear Scale three types of value indicators are available.
|Level Bar||A Level Bar performs the same function as a conventional thermometer (e.g. the current temperature).||LinearScaleLevelBar||LinearScaleLevelBarCollection||LinearScale.LevelBars|
|Marker||A Marker is a scale pointer that indicates a certain value along a scale (e.g. an average temperature in a thermometer).||LinearScaleMarker||LinearScaleMarkerCollection||LinearScale.Markers|
|Range Bar||A Range Bar is a filled rectangle that represents some data range along a scale.||LinearScaleRangeBar||LinearScaleRangeBarCollection||LinearScale.RangeBars|
Value indicators for linear scale are illustrated in the image below.