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Navigation display: Difference between revisions
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The '''navigation display''' (ND) instrument provides a texture resembling the display of the navigation or map displays found in many digital cockpits and GPS units. The instrument tries to be sufficiently generic, to approximate many different real-world displays. Fortunately, most real-world displays are quite similar to each other, with some systems offering additional features that will be added later. | |||
The navigation display (ND) instrument provides a texture resembling the display of the navigation or map displays found in many digital cockpits and GPS units. The instrument tries to be sufficiently generic, to approximate many different real-world displays. Fortunately, most real-world displays are quite similar to each other, with some systems offering additional features that will be added later. | |||
Since the ND system simply displays entities (AI objects, navaids, etc), in an area into a 2D display, it's hoped that it can be reused for some other kinds of cockpit display. | Since the ND system simply displays entities (AI objects, navaids, etc), in an area into a 2D display, it's hoped that it can be reused for some other kinds of cockpit display. | ||
Weather radar (WXR) and terrain (TERR / EGPWS) layers are planned as complementary textures, which would be displayed beneath the ND texture. | Weather radar (WXR) and terrain (TERR / [[Ground proximity warning system|EGPWS]]) layers are planned as complementary textures, which would be displayed beneath the ND texture. | ||
==Status== | ==Status== | ||
Prototype code exists, which is in the process of being re-written to provide a more configurable system. Navaid, airport, waypoint, route and traffic ([[TCAS]]) data can be displayed. [http://files.goneabitbursar.com/fg/nd-preview-180611.png Current screenshot] | |||
Prototype code exists, which is in the process of being re-written to provide a more configurable system. Navaid, airport, waypoint, route and traffic (TCAS) data can be displayed. [http://files.goneabitbursar.com/fg/nd-preview-180611.png Current screenshot] | |||
==Configuration== | ==Configuration== | ||
The ND instrument has a number of configuration properties, most of which can be changed dynamically to reflect display state changes. Importantly, the logical origin on the display can be moved to simulate ARC versus centred modes, the 'up' heading can be set to allow for PLAN vs up-is-aircraft-track vs up-is-aircraft-heading modes. Similarly the range (in nm) can be set. | The ND instrument has a number of configuration properties, most of which can be changed dynamically to reflect display state changes. Importantly, the logical origin on the display can be moved to simulate ARC versus centred modes, the 'up' heading can be set to allow for PLAN vs up-is-aircraft-track vs up-is-aircraft-heading modes. Similarly the range (in nm) can be set. | ||
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==Symbols== | ==Symbols== | ||
Symbols are the main display element of the ND. Each symbol can have a textured quad, positioned and rotated on the display, with a color assignment, and optionally a text label. The main configuration task in creating a ND, is to define the symbols. | Symbols are the main display element of the ND. Each symbol can have a textured quad, positioned and rotated on the display, with a color assignment, and optionally a text label. The main configuration task in creating a ND, is to define the symbols. | ||
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===Selection=== | ===Selection=== | ||
Symbol rules apply to a particular type or types of item. The list of types (and some other information available) is given below, but should be straightforward. Adding more types is possible, if requested (and FlightGear supports them!) | Symbol rules apply to a particular type or types of item. The list of types (and some other information available) is given below, but should be straightforward. Adding more types is possible, if requested (and FlightGear supports them!) | ||
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==Custom symbols== | ==Custom symbols== | ||
In addition to the build-in symbol sources, you can define your own symbol items in a property tree. This is to allow custom items on the display, which can be used to achieve most aircraft-specififc customisation. Items can be positioned in display pixel coordinates (X/Y), lat/lon or relative to another point. This allows for items such as the INS / GPS position icons on the Boeing display, climb/descend point symbols on the active route, or additional lubber/track/heading lines. | In addition to the build-in symbol sources, you can define your own symbol items in a property tree. This is to allow custom items on the display, which can be used to achieve most aircraft-specififc customisation. Items can be positioned in display pixel coordinates (X/Y), lat/lon or relative to another point. This allows for items such as the INS / GPS position icons on the Boeing display, climb/descend point symbols on the active route, or additional lubber/track/heading lines. | ||