Needle

A Needle element is used to indicate a particular value in a circular scale. By default, the needle starts at the center of a scale and ends at the current scale's value.

You can place an unlimited number of needles on a scale. A needle is represented by the ArcScaleNeedle class.

The following image shows a circular gauge with two needles on it.

CircularGauge_Needle

At design time, you can customize a gauge's needles using the Preset Manager.

The table below lists the main properties affecting element behavior and appearance.

Characteristics Members
Data ValueIndicatorComponent<TProvider>.Value
Layout ArcScaleNeedle.StartOffset,ArcScaleNeedle.EndOffset,BaseLeafPrimitive.ZOrder
Appearance ArcScaleNeedle.ShapeType