311 lines
9.1 KiB
Text
311 lines
9.1 KiB
Text
# geo functions
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# -------------------------------------------------------------------------------------------------
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#
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#
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# geo.Coord class
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# -------------------------------------------------------------------------------------------------
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#
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# geo.Coord.new([<coord>]) ... class that holds and maintains geographical coordinates
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# can be initialized with another geo.Coord instance
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#
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# SETTER METHODS:
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#
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# .set(<coord>) ... sets coordinates from another geo.Coord instance
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#
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# .set_lat(<num>) ... functions for setting latitude/longitude/altitude
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# .set_lon(<num>)
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# .set_alt(<num>)
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# .set_latlon(<num>, <num> [, <num>]) (altitude is optional; default=0)
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#
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# .set_x(<num>) ... functions for setting cartesian x/y/z coordinates
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# .set_y(<num>)
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# .set_z(<num>)
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# .set_xyz(<num>, <num>, <num>)
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#
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#
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# GETTER METHODS:
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#
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# .lat()
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# .lon() ... functions for getting lat/lon/alt
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# .alt() ... returns altitude in m
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# .latlon() ... returns vector [<lat>, <lon>, <alt>]
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#
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# .x() ... functions for reading cartesian coords (in m)
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# .y()
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# .z()
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# .xyz() ... returns vector [<x>, <y>, <z>]
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#
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#
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# QUERY METHODS:
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#
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# .is_defined() ... returns whether the coords are defined
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# .dump() ... outputs coordinates
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# .course_to(<coord>) ... returns course to another geo.Coord instance (degree)
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# .distance_to(<coord>) ... returns distance in m along Earth curvature, ignoring altitudes
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# useful for map distance
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# .direct_distance_to(<coord>) ... distance in m direct, considers altitude,
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# but cuts through Earth surface
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#
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#
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# MANIPULATION METHODS:
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#
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# .apply_course_distance(<course>, <distance>) ... guess what
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#
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#
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#
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#
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# -------------------------------------------------------------------------------------------------
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#
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# geo.aircraft_position() ... returns current aircraft position as geo.Coord
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# geo.viewer_position() ... returns viewer position as geo.Coord
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# geo.click_position() ... returns last click coords as geo.Coord or nil before first click
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#
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# geo.tile_path(<lat>, <lon>) ... returns tile path string (e.g. "w130n30/w123n37/942056.stg")
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# geo.elevation(<lat>, <lon> [, <top:10000>])
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# ... returns elevation in meter for given lat/lon, or nil on error;
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# <top> is the altitude at which the intersection test starts
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#
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# geo.normdeg(<angle>) ... returns angle normalized to 0 <= angle < 360
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#
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# geo.put_model(<path>, <lat>, <lon> [, <elev:nil> [, <hdg:0> [, <pitch:0> [, <roll:0>]]]]);
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# ... put model <path> at location <lat>/<lon> with given elevation
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# (optional, default: surface). <hdg>/<pitch>/<roll> are optional
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# and default to zero.
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# geo.put_model(<path>, <coord> [, <hdg:0> [, <pitch:0> [, <roll:0>]]]);
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# ... same as above, but lat/lon/elev are taken from a Coord object
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var EPSILON = 1e-15;
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var ERAD = 6378138.12; # Earth radius (m)
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var floor = func(v) v < 0.0 ? -int(-v) - 1 : int(v);
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# class that maintains one set of geographical coordinates
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#
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var Coord = {
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new: func(copy = nil) {
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var m = { parents: [Coord] };
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m._pdirty = 1; # polar
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m._cdirty = 1; # cartesian
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m._lat = nil; # in radian
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m._lon = nil; #
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m._alt = nil; # ASL
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m._x = nil; # in m
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m._y = nil;
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m._z = nil;
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if (copy != nil)
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m.set(copy);
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return m;
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},
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_cupdate: func {
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me._cdirty or return;
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var xyz = geodtocart(me._lat * R2D, me._lon * R2D, me._alt);
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me._x = xyz[0];
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me._y = xyz[1];
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me._z = xyz[2];
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me._cdirty = 0;
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},
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_pupdate: func {
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me._pdirty or return;
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var lla = carttogeod(me._x, me._y, me._z);
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me._lat = lla[0] * D2R;
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me._lon = lla[1] * D2R;
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me._alt = lla[2];
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me._pdirty = 0;
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},
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x: func { me._cupdate(); me._x },
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y: func { me._cupdate(); me._y },
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z: func { me._cupdate(); me._z },
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xyz: func { me._cupdate(); [me._x, me._y, me._z] },
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lat: func { me._pupdate(); me._lat * R2D }, # return in degree
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lon: func { me._pupdate(); me._lon * R2D },
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alt: func { me._pupdate(); me._alt },
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latlon: func { me._pupdate(); [me._lat * R2D, me._lon * R2D, me._alt] },
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set_x: func(x) { me._pupdate(); me._pdirty = 1; me._x = x; me },
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set_y: func(y) { me._pupdate(); me._pdirty = 1; me._y = y; me },
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set_z: func(z) { me._pupdate(); me._pdirty = 1; me._z = z; me },
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set_lat: func(lat) { me._cupdate(); me._cdirty = 1; me._lat = lat * D2R; me },
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set_lon: func(lon) { me._cupdate(); me._cdirty = 1; me._lon = lon * D2R; me },
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set_alt: func(alt) { me._cupdate(); me._cdirty = 1; me._alt = alt; me },
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set: func(c) {
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c._pupdate();
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me._lat = c._lat;
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me._lon = c._lon;
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me._alt = c._alt;
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me._cdirty = 1;
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me._pdirty = 0;
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me;
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},
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set_latlon: func(lat, lon, alt = 0) {
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me._lat = lat * D2R;
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me._lon = lon * D2R;
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me._alt = alt;
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me._cdirty = 1;
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me._pdirty = 0;
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me;
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},
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set_xyz: func(x, y, z) {
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me._x = x;
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me._y = y;
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me._z = z;
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me._pdirty = 1;
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me._cdirty = 0;
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me;
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},
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apply_course_distance: func(course, dist) {
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me._pupdate();
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course *= D2R;
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dist /= ERAD;
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me._lat = math.asin(math.sin(me._lat) * math.cos(dist)
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+ math.cos(me._lat) * math.sin(dist) * math.cos(course));
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if (math.cos(me._lat) > EPSILON)
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me._lon = math.pi - math.mod(math.pi - me._lon
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- math.asin(math.sin(course) * math.sin(dist)
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/ math.cos(me._lat)), 2 * math.pi);
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me._cdirty = 1;
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me;
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},
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course_to: func(dest) {
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me._pupdate();
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dest._pupdate();
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if (me._lat == dest._lat and me._lon == dest._lon)
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return 0;
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var dlon = dest._lon - me._lon;
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var ret = nil;
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call(func ret = math.mod(math.atan2(math.sin(dlon) * math.cos(dest._lat),
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math.cos(me._lat) * math.sin(dest._lat)
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- math.sin(me._lat) * math.cos(dest._lat)
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* math.cos(dlon)), 2 * math.pi) * R2D, nil, var err = []);
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if (size(err)) {
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debug.printerror(err);
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debug.dump(me._lat, me._lon, dlon, dest._lat, dest._lon, "--------------------------");
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}
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return ret;
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},
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# arc distance on an earth sphere; doesn't consider altitude
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distance_to: func(dest) {
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me._pupdate();
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dest._pupdate();
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if (me._lat == dest._lat and me._lon == dest._lon)
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return 0;
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var a = math.sin((me._lat - dest._lat) * 0.5);
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var o = math.sin((me._lon - dest._lon) * 0.5);
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return 2.0 * ERAD * math.asin(math.sqrt(a * a + math.cos(me._lat)
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* math.cos(dest._lat) * o * o));
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},
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direct_distance_to: func(dest) {
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me._cupdate();
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dest._cupdate();
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var dx = dest._x - me._x;
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var dy = dest._y - me._y;
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var dz = dest._z - me._z;
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return math.sqrt(dx * dx + dy * dy + dz * dz);
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},
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is_defined: func {
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return !(me._cdirty and me._pdirty);
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},
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dump: func {
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if (me._cdirty and me._pdirty)
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print("Coord.dump(): coordinates undefined");
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me._cupdate();
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me._pupdate();
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printf("x=%f y=%f z=%f lat=%f lon=%f alt=%f",
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me.x(), me.y(), me.z(), me.lat(), me.lon(), me.alt());
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},
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};
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# normalize degree to 0 <= angle < 360
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#
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var normdeg = func(angle) {
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while (angle < 0)
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angle += 360;
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while (angle >= 360)
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angle -= 360;
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return angle;
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}
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var tile_index = func(lat, lon) {
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return tileIndex(lat, lon);
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}
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var format = func(lat, lon) {
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sprintf("%s%03d%s%02d", lon < 0 ? "w" : "e", abs(lon), lat < 0 ? "s" : "n", abs(lat));
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}
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var tile_path = func(lat, lon) {
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var p = tilePath(lat, lon) ~ "/" ~ tileIndex(lat, lon) ~ ".stg";
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}
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var put_model = func(path, c, arg...) {
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call(_put_model, [path] ~ (isa(c, Coord) ? c.latlon() : [c]) ~ arg);
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}
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var _put_model = func(path, lat, lon, elev_m = nil, hdg = 0, pitch = 0, roll = 0) {
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if (elev_m == nil)
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elev_m = elevation(lat, lon);
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if (elev_m == nil)
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die("geo.put_model(): cannot get elevation for " ~ lat ~ "/" ~ lon);
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fgcommand("add-model", var n = props.Node.new({ "path": path,
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"latitude-deg": lat, "longitude-deg": lon, "elevation-m": elev_m,
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"heading-deg": hdg, "pitch-deg": pitch, "roll-deg": roll,
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}));
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return props.globals.getNode(n.getNode("property").getValue());
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}
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var elevation = func(lat, lon, maxalt = 10000) {
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var d = geodinfo(lat, lon, maxalt);
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return d == nil ? nil : d[0];
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}
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var click_coord = Coord.new();
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_setlistener("/sim/signals/click", func {
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var lat = getprop("/sim/input/click/latitude-deg");
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var lon = getprop("/sim/input/click/longitude-deg");
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var elev = getprop("/sim/input/click/elevation-m");
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click_coord.set_latlon(lat, lon, elev);
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});
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var click_position = func {
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return click_coord.is_defined() ? Coord.new(click_coord) : nil;
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}
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var aircraft_position = func {
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var lat = getprop("/position/latitude-deg");
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var lon = getprop("/position/longitude-deg");
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var alt = getprop("/position/altitude-ft") * FT2M;
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return Coord.new().set_latlon(lat, lon, alt);
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}
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var viewer_position = func {
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var x = getprop("/sim/current-view/viewer-x-m");
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var y = getprop("/sim/current-view/viewer-y-m");
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var z = getprop("/sim/current-view/viewer-z-m");
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return Coord.new().set_xyz(x, y, z);
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}
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