Rudder Indicator

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The Rudder Indicator is a small symbol that shows the angle of a rudder with a needle. It is found in the Maritime - OpenBridge section of the Perspective Component Palette as Rudder Indicator.

It is the indicator form of the Rudder: it has no scale, labels or advice zones, and is meant for overviews where the rudder is one of many things shown. See Instruments and Indicators.

A Rudder Indicator dropped from the palette shows a rudder at 0°:

Angle

Bind angle to the rudder angle in degrees. Positive is starboard (to the right), negative is port (to the left). The needle turns with the angle, and the area between the needle and the centre line is filled.

-35	0	35

Properties

Name	Description	Property Type
angle	Rudder angle in degrees; positive is starboard. Default 0.	value

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State

state tells whether this workstation controls the rudder. Its values differ from the state of the full instruments:

state
in-command (default)	This workstation is in command. The needle is drawn in the enhanced colour.
not-in-command	The rudder is controlled from elsewhere. The needle is neutral, and a marker shows the setpoint.
off	No signal. The needle is dimmed.

Setpoint

Bind setpoint to the ordered rudder angle. In the images above, the angle is 15° and the setpoint 20°: the setpoint marker is drawn in the not-in-command state only.

Properties

Name	Description	Property Type
state	in-command, not-in-command or off. Default in-command.	value
setpoint	Ordered rudder angle in degrees. Default 0.	value

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Silhouette

Set hasSilhouette to true to draw an outline around the symbol, which sets it off from a busy background such as a vessel drawing.

false (default)	true

Properties

Name	Description	Property Type
hasSilhouette	Draw an outline around the symbol. Default false.	value

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Size

The indicator scales to fit the component’s box and is centred in it. The blue frame is the component’s box:

Small box	Wide box

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Properties

Properties not covered in the sections above:

Name	Description	Property Type
style	Standard Perspective style object.	object

Component Events

The Rudder Indicator has no component events of its own.

Examples

Example 1 — Rudder on a Conning Overview

1. Drop a Rudder Indicator onto the stern of the vessel drawing.
2. Bind angle to [default]Steering/RudderAngle and setpoint to [default]Steering/RudderOrder.
3. Bind state to an expression such as if({[default]Bridge/InCommand}, 'in-command', 'not-in-command').
4. Set hasSilhouette to true.