Value Indicators
- 2 minutes to read
This topic defines value indicators and explains how they should be used in analog gauges (circular and linear).
A Value Indicator is a pointer that allows you to track the changes of a data value or a data range in analog gauges.
NOTE
The value indicators can be accessed at design time using the gauge Designer.
Depending on the gauge scale, the following indicators are available.
Arc Scale's Indicators
A list of circular gauge indicators is shown below. It includes:
| Element | Description | Class |
|---|---|---|
| Needle | A needle indicates a value on a scale. It is oriented radially, starting at the scale's center and pointing to the scale's current value. | ArcScaleNeedleComponent |
| Range Bar | A range bar within circular gauges is a filled sector that always starts at some fixed value along a scale and extends to another value (the scale's current value or another fixed value). | ArcScaleRangeBarComponent |
| Marker | A marker is a small thumb indicating the current value along a scale. | ArcScaleMarkerComponent |
The following image demonstrates value indicators in the arc scale and their properties that correspond to an indicator's current values.
For more information on these visual elements, see the Circular Gauge Elements topic.
Linear Scale's Indicators
A Linear scale provides the following indicator types.
| Element | Description | Class |
|---|---|---|
| Level Bar | A level bar is a visual element that associates its values with a particular scale. The level bar automatically fills a bar along that scale, starting at the scale's minimum value and extending to the scale's current value. | LinearScaleLevelComponent |
| Range Bar | A range bar is a filled rectangle that represents a data range along a scale. The range bar starts at a certain fixed value along a scale and extends to the scale's current value. | LinearScaleRangeBarComponent |
| Marker | A marker is a small thumb indicating the current value along a scale. | LinearScaleMarkerComponent |
The image below shows value indicators with specified properties that correspond to their current values in the linear scale.
To learn more, see Linear Gauge Elements.