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Canvas MapStructure: Difference between revisions
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→Example: Tutorial Layer (TUT
m (→Example: Tutorial Layer (TUT: http://forum.flightgear.org/viewtopic.php?f=71&t=27591#p259306) |
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| Line 1,178: | Line 1,178: | ||
if (tutorial != nil) { | if (tutorial != nil) { | ||
allTargets = tutorial.getNode("targets"); | allTargets = tutorial.getNode("targets"); | ||
props.dump(allTargets); | |||
} | } | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| Line 1,205: | Line 1,205: | ||
Now, let's turn the whole thing into a searchCmd() function that we can us in our MapStructure layer: | |||
<syntaxhighlight lang="nasal"> | |||
var getTutorialNode = func(name) { | |||
var tutorialN = nil; | |||
foreach (var c; props.globals.getNode("/sim/tutorials").getChildren("tutorial")) { | |||
if (c.getNode("name").getValue() == name) { | |||
tutorialN = c; | |||
return tutorialN; | |||
} | |||
} | |||
if (tutorialN == nil) { | |||
screen.log.write('Unable to find tutorial "' ~ name ~ '"'); | |||
return nil; | |||
} | |||
} | |||
var getTargets = func(node) { | |||
var results = []; | |||
foreach (var t; node.getChildren()) { | |||
var lon = t.getNode("longitude-deg"); | |||
var lat = t.getNode("latitude-deg"); | |||
if (lon == nil or lat == nil) | |||
die("target coords undefined"); | |||
var target = geo.Coord.new().set_latlon(lat.getValue(), lon.getValue()); | |||
append(results,target); | |||
} | |||
return results; | |||
} | |||
var searchCmd=func() { | |||
var tutorial = getTutorialNode("Taxiing"); | |||
var allTargets = nil; | |||
if (tutorial != nil) { | |||
allTargets = tutorial.getNode("targets"); | |||
#props.dump(allTargets); | |||
return getTargets(allTargets); | |||
} | |||
} # searchCmd | |||
debug.dump( searchCmd() ); | |||
</syntaxhighlight> | |||
Next, we need to come up with some boilerplate code for creating a new MapStructure layer, and then populate the searchCmd() method using our two helper fnctions | Next, we need to come up with some boilerplate code for creating a new MapStructure layer, and then populate the searchCmd() method using our two helper fnctions | ||