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Canvas snippets: Difference between revisions
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http://wiki.flightgear.org/Canvas_MapStructure#The_SymbolCache
m (→Adding OpenVG Paths: http://forum.flightgear.org/viewtopic.php?f=4&t=25747&p=238677&hilit=curves#p238677) |
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== Using the SymbolCache == | |||
Whenever a symbol may need to be instanced multiple times, it makes sense to use caching - otherwise, identical symbols would be treated as separate OpenVG groups, all of which would need to be rasterized/rendedered separately. Typically, a map may display multiple instances of an otherwise identical symbol (think VOR, NDB, DME etc) - equally, a multiplayer map may showing multiple aircraft symbols at the same time. In these cases, it makes sense to use the SymbolCache framework, which will render symbols into a separate Canvas texture and provide a texture map that can be treated as a lookup map, which even supports styling for otherwise identical symbols. To learn more, please refer to [[Canvas MapStructure#The_SymbolCache|SymbolCache]] | |||
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! Screenshot !! Code | |||
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| [[File:Canvas-svg-support.png|thumb|screen shot demonstrating how the scripted Nasal-based SVG parser can be used to dynamically turn SVG files into OpenVG instructions understood by Canvas]] | |||
| {{Caution|This is currently untested code}} | |||
<syntaxhighlight lang="nasal" enclose="div"> | |||
# ... | |||
</syntaxhighlight> | |||
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== Adding Text Elements == | == Adding Text Elements == | ||
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== Adding a 2D Panel == | == Adding a 2D Panel == | ||
== Adding a PFD == | == Adding a PFD == | ||
== Adding a Failure Mgmt Widget == | == Adding a Failure Mgmt Widget == | ||