Knob Overview

Measurement Studio User Interface

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Knob Overview

Represents different types of circular displays on a user interface. A knob accepts and displays individual or multiple scalar values.

  • Different display styles: dials, gauges, and meters.
  • Automatic axis labeling with numeric scales (log or inverted) and values (continuous or discrete).
  • Multiple pointers, each one representing one scalar value. A pointer indicates the current value of the knob.
  • Custom ticks, labels, and value pairs. Ticks are the divisions that represent increments on the knob. Labels display the value of each tick. Value pairs are names paired with a value. For example, use a value pair to add the text label "Boiling Point" to a numeric axis at the value 212 °F.
  • Built-in format styles for the labels, including scientific, symbolic engineering, scaling, time, and date.
  • Animation. You can animate different parts of the control. For example, you might want to animate a pointer if its value exceeds a safe limit in the application.
  • Custom images. Add images to different parts of the control, including the background and pointer(s).
  • Three-dimensional knob style.


  • To get information about any of the properties in the knob control's property pages, right click on the property and select What's This?. For complete reference information about this control and its properties, click on the Visual Basic or Visual C++ Reference link.
  • In Visual C++, if you select the ALL tab in the property pages, the What's This? help is disabled.