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add "terrain-elevation" utility function

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This commit is contained in:
mfranz 2007-05-03 22:09:34 +00:00
parent d4143454b1
commit 9f1bc7efeb
1 changed files with 8 additions and 1 deletions
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9
Nasal/geo.nas
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@ -38,6 +38,7 @@
# geo.click_position() ... returns last click coords as geo.Coord or nil before first click
#
# geo.tile_path(<lon>, <lat>) ... returns tile path string (e.g. "w130n30/w123n37/942056.stg")
# geo.elevation(<lon>, <lat>) ... returns elevation in meter for given lon/lat, or nil on error
# geo.normdeg(<angle>) ... returns angle normalized to 0 <= angle < 360
@ -49,7 +50,7 @@ var FT2M = 0.3048;
var M2FT = 3.28083989501312335958;
var printf = func(_...) { print(call(sprintf, _)) }
var printf = func { print(call(sprintf, arg)) }
var floor = func(v) { v < 0.0 ? -int(-v) - 1 : int(v) }
var sin = math.sin;
var cos = math.cos;
@ -288,6 +289,12 @@ var tile_path = func(lon, lat) {
}
var elevation = func(lon, lat) {
var n = props.Node.new({ "longitude-deg" : lon, "latitude-deg" : lat });
var success = fgcommand("terrain-elevation", n);
return success ? n.getNode("elevation-m").getValue() : nil;
}
var aircraft_lon = nil;
var aircraft_lat = nil;