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make "terrain-elevation" wrapper more efficient

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This commit is contained in:
mfranz 2007-05-05 10:09:13 +00:00
parent 207d82249f
commit c13914937e
1 changed files with 19 additions and 4 deletions
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23
Nasal/geo.nas
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@ -28,7 +28,7 @@
# Coord.distance_to(<coord>) ... returns distance in m along Earth curvature, ignoring altitudes
# useful for map distance
# Coord.direct_distance_to(<coord>) ... distance in m direct, considers altitude,
# but cuts through Earch surface
# but cuts through Earth surface
#
# Coord.apply_course_distance(<course>, <distance>) ... guess what
# Coord.dump() ... outputs coordinates
@ -289,10 +289,16 @@ var tile_path = func(lon, lat) {
}
var terr_tree = nil;
var terr_lon = nil;
var terr_lat = nil;
var terr_elev = nil;
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;
terr_lon.setDoubleValue(lon);
terr_lat.setDoubleValue(lat);
var success = fgcommand("terrain-elevation", terr_tree);
return success ? terr_elev.getValue() : nil;
}
@ -329,6 +335,14 @@ var click_position = func {
_setlistener("/sim/signals/nasal-dir-initialized", func {
terr_tree = props.Node.new();
terr_lon = terr_tree.getNode("longitude-deg", 1);
terr_lat = terr_tree.getNode("latitude-deg", 1);
terr_elev = terr_tree.getNode("elevation-m", 1);
terr_lon.setDoubleValue(0.0);
terr_lat.setDoubleValue(0.0);
terr_elev.setDoubleValue(0.0);
aircraft_lon = props.globals.getNode("/position/longitude-deg", 1);
aircraft_lat = props.globals.getNode("/position/latitude-deg", 1);
aircraft_alt = props.globals.getNode("/position/altitude-ft", 1);
@ -337,3 +351,4 @@ _setlistener("/sim/signals/nasal-dir-initialized", func {
click_lat = props.globals.getNode("/sim/input/click/latitude-deg", 1);
click_elev = props.globals.getNode("/sim/input/click/elevation-m", 1);
});