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The following document describes what a scale is, what kinds of scales are present in Gauges and also how scales can be used.
A Scale is a key element of a Gauge control. It displays static items as labels, tickmarks, ranges and other elements that visually represent a Gauge control and its appearance; and also contains dynamic gauge elements used to indicate current values of a variable data (so-called Value Indicators).
There are two types of scales, each compatible with its specific Gauge control.
Arc Scale.This scale is intended to be used with the CircularGauge. An instance of an arc scale is represented by the ArcScale object. It can be accessed as an item of the ArcScaleCollection object returned by the CircularGauge.Scales property.
A typical Arc Scale is shown in the image below:
Linear Scale. This scale is used with the LinearGauge. It is represented by an instance of the LinearScale class. It can be accessed as an item of the LinearScaleCollection object returned by the LinearGauge.Scales property.