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Canvas ND framework: Difference between revisions
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If you are finding yourself having problems integrating the framework, please refer to already integrated aircraft as reference/example, or get in touch with their maintainers - ideally, via the forum, so that everybody can contribute and benefit. | If you are finding yourself having problems integrating the framework, please refer to already integrated aircraft as reference/example, or get in touch with their maintainers - ideally, via the forum, so that everybody can contribute and benefit. | ||
== Design == | |||
{{FGCquote | |||
|Originally, it was a single monolithic update() method that would basically be called at frame rate using a settimer/maketimer callback.<br/> | |||
When things were restructured, the conditional parts of this huge method were moved into predicates that reside in a huge hash: [https://gitorious.org/fg/fgdata/source/Nasal/canvas/map/navdisplay.styles#L14 https://gitorious.org/fg/fgdata/source/ ... styles#L14]<br/> | |||
Meanwhile, the update() method has been inflated again due to some logic that wasn't added to the hash, e.g. see: [https://gitorious.org/fg/fgdata/source/Nasal/canvas/map/navdisplay.mfd#L476 https://gitorious.org/fg/fgdata/source/ ... y.mfd#L476]<br/> | |||
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The meat of it still is in update(), and those "layers" are fairly boring meanwhile because they're separately managed by Philosopher's MapStructure framework.<br/> | |||
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But individual ND elements (canvas groups) are basically SVG-driven, i.e. SVG elements that are looked up and then updated/animated via timers and listeners: [https://gitorious.org/fg/fgdata/source/f3df87622ca60eb45f359c05bd913524eeb44667:Nasal/canvas/map/navdisplay.styles#L183 https://gitorious.org/fg/fgdata/source/ ... tyles#L183]<br/> | |||
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The actual code evaluating each SVG predicate is still called via the update() method, but it's just a foreach loop with a few lines:<br/> | |||
[https://gitorious.org/fg/fgdata/source/Nasal/canvas/map/navdisplay.mfd#L760-769 https://gitorious.org/fg/fgdata/source/ ... d#L760-769]<br/> | |||
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None of this is set in stone, and we're actually looking forward to generalizing this some more. | |||
|{{cite web |url=http://forum.flightgear.org/viewtopic.php?p=212488#p212488 | |||
|title=<nowiki>Re: Event Management module for post 3.2</nowiki> | |||
|author=<nowiki>Hooray</nowiki> | |||
|date=<nowiki>Fri Jun 13</nowiki> | |||
}} | |||
}} | |||
== Custom ND Styles == | == Custom ND Styles == | ||