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Canvas snippets: Difference between revisions
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→Using the SymbolCache
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! Screenshot !! Code | ! Screenshot !! Code | ||
|- | |- | ||
| [[File:Canvas- | | [[File:Canvas-SymbolCache-Instancing.png|thumb|Screen shot showing a Canvas based GUI dialog that is using the SymbolCache for instancing multiple symbols (including support for styling)]] | ||
| {{Caution|This is currently untested code}} | | {{Caution|This is currently untested code}} | ||
<syntaxhighlight lang="nasal" enclose="div"> | <syntaxhighlight lang="nasal" enclose="div"> | ||
## | ## | ||
# this is the function that draws a symbol using OpenVG paths | # this is the function that draws a symbol using OpenVG paths | ||
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# create a new cache entry for the styled symbol | # create a new cache entry for the styled symbol | ||
var myCachedSymbol = StyleableCacheable.new( | var myCachedSymbol = canvas.StyleableCacheable.new( | ||
name:'myVOR', draw_func: drawVOR, | name:'myVOR', draw_func: drawVOR, | ||
cache: canvas.SymbolCache32x32, # the cache to be used | cache: canvas.SymbolCache32x32, # the cache to be used | ||
draw_mode: SymbolCache.DRAW_CENTERED, | draw_mode: canvas.SymbolCache.DRAW_CENTERED, | ||
relevant_keys: ['line_width', 'color'], # styling related attributes | relevant_keys: ['line_width', 'color'], # styling related attributes | ||
); | ); | ||
var target = root.createChild('group'); | var target = root.createChild('group'); | ||
var offset=50; | |||
var x=0; | |||
var y=height/2; | |||
for (var i=0;i<5;i+=1) { | |||
# look up the raster image for the symbol | # look up the raster image for the symbol | ||
# render it using the passed style and adjust scaling | # render it using the passed style and adjust scaling | ||
var instanced = myCachedSymbol.render(target, style).setScale( | var instanced = myCachedSymbol.render(target, style).setScale(style.scale_factor).setTranslation(x+=offset,y) | ||
}</syntaxhighlight> | |||
</syntaxhighlight> | |||
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|} | |} | ||