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[[File:Canvas-livery-demo-using-ogle.png|thumb|A screen shot showing the ogel aircraft whose livery is dynamically changed using the [[Canvas]] system - in this case, we're simply rendering a [[MapStructure]] map onto the face of the pilot using ~10 lines of Nasal/Canvas code.]]
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== Example ==
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<syntaxhighlight lang="nasal">
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# create a new window, dimensions are 320 x 160, using the dialog decoration (i.e. titlebar)
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var window = canvas.Window.new([320,160],"dialog");
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# adding a canvas to the new window and setting up background colors/transparency
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var myCanvas = window.createCanvas();
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# creating the top-level/root group which will contain all other elements/group
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var root = myCanvas.createGroup();
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# ogel
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myCanvas.addPlacement({"node": "Head"});
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var TestMap = root.createChild("map");
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TestMap.setController("Aircraft position");
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TestMap.setRange(25);
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TestMap.setTranslation(    myCanvas.get("view[0]")/2,
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                          myCanvas.get("view[1]")/2
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                        );
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var r = func(name,vis=1,zindex=nil) return caller(0)[0];
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foreach(var type; [r('APT'), r('VOR') ] )
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TestMap.addLayer(factory: canvas.SymbolLayer, type_arg: type.name, visible: type.vis, priority: type.zindex,);
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</syntaxhighlight>
    
== Objective ==
 
== Objective ==

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