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Evolving the MapStructure & NavDisplay Frameworks ...

Canvas is FlightGear's new fully scriptable 2D drawing system that will allow you to easily create new instruments, HUDs and even GUI dialogs and custom GUI widgets, without having to write C++ code and without having to rebuild FlightGear.

Evolving the MapStructure & NavDisplay Frameworks ...

Postby Hooray » Tue Jun 24, 2014 9:23 pm

The extra500 developers just posted a few screen shots of the Avidyne Entegra R9 in "moving map" mode, which demonstrates a few use-cases that we do not currently support in MapStructure (the ND being a different matter for now):

http://wiki.flightgear.org/Extra_EA-500 ... Moving_Map
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Specifically, this probably means that we may need to revamp/resurrect symbol controllers and maybe accept an optional callback to pre-/post-transform individual symbols (they're rotated apparently according to runway orientation), and allow them to be overridden when instantiating the layer (i.e. via the ctor if SVG-based). And we may also want to explore SVG styling by patching svg.nas to run a "transform" callback to customize/colorize certain elements of the SVG. The instrument itself is meanwhile making fairly aggressive use of texture-map based caching for basically ALL symbols.

The other thing is that translation (centered/off center mode) should always be based on the parent group's dimensions (bounding box) and that we really shouldn't be using the top-level canvas, because a MFD very well be split into several screen areas (which also applies to the GPSMap196 and most other modern avionics).
Please don't send support requests by PM, instead post your questions on the forum so that all users can contribute and benefit
Thanks & all the best,
Hooray
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pui2canvas | MapStructure | Canvas Development | Programming resources
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