134 lines
3.3 KiB
Text
134 lines
3.3 KiB
Text
# Draw 3 degree glide slope tunnel for the nearest airport's most suitable runway
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# considering wind direction and runway size.
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# Activate with --prop:sim/rendering/glide-slope-tunnel=1 or via Help menu
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var MARKER = "Models/Geometry/square.xml"; # tunnel marker
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var DIST = 1000; # distance between markers
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var NUM = 30; # number of tunnel markers
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var ANGLE = 3 * math.pi / 180; # glide slope angle in radian
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var HOFFSET = 274; # distance between begin of runway and touchdown area (900 ft)
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var INTERVAL = 5; # check for nearest airport
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var voffset = DIST * math.sin(ANGLE) / math.cos(ANGLE);
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var apt = nil;
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var tunnel = [];
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setsize(tunnel, NUM);
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var normdeg = func(a) {
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while (a >= 180)
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a -= 360;
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while (a < -180)
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a += 360;
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return a;
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}
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# For each runway complement the opposite end, as airportinfo() returns only one end.
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#
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var complement_runways = func(apt) {
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foreach (var rwy; keys(apt.runways)) {
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if (!string.isdigit(rwy[0]))
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continue;
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var number = math.mod(num(substr(rwy, 0, 2)) + 18, 36);
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var side = substr(rwy, 2, 1);
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var comp = sprintf("%02d%s", number, side == "R" ? "L" : side == "L" ? "R" : side);
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var r = apt.runways[rwy];
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apt.runways[comp] = {
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lat: r.lat, lon: r.lon, length: r.length,
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width: r.width, heading: math.mod(r.heading + 180, 360),
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threshold1: r.threshold2,
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threshold2: r.threshold1,
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stopway1: r.stopway2,
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stopway2: r.stopway1,
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};
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}
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}
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# Find best runway for current wind direction (or 270), also considering length and width.
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#
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var best_runway = func(apt) {
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var wind_speed = getprop("/environment/wind-speed-kt");
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var wind_from = wind_speed ? getprop("/environment/wind-from-heading-deg") : 270;
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var max = -1;
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var rwy = nil;
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foreach (var r; keys(apt.runways)) {
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var curr = apt.runways[r];
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var deviation = math.abs(normdeg(wind_from - curr.heading)) + 1e-20;
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var v = (0.01 * curr.length + 0.01 * curr.width) / deviation;
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if (v > max) {
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max = v;
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rwy = curr;
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}
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}
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return rwy;
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}
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# Draw 3 degree glide slope tunnel.
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#
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var draw_tunnel = func(rwy) {
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var m = geo.Coord.new().set_latlon(rwy.lat, rwy.lon);
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m.apply_course_distance(rwy.heading + 180, rwy.length / 2 - rwy.threshold1 - HOFFSET);
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var g = geodinfo(m.lat(), m.lon());
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var elev = g != nil ? g[0] : apt.elevation;
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forindex (var i; tunnel) {
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if (tunnel[i] != nil)
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tunnel[i].remove();
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m.set_alt(elev);
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tunnel[i] = geo.put_model(MARKER, m, rwy.heading);
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m.apply_course_distance(rwy.heading + 180, DIST);
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elev += voffset;
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}
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}
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var loop = func(id) {
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id == loopid or return;
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var a = airportinfo();
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if (apt == nil or apt.id != a.id) {
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apt = a;
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var is_heliport = 1;
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foreach (var rwy; keys(apt.runways))
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if (rwy[0] != `H`)
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is_heliport = 0;
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if (!is_heliport) {
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complement_runways(apt);
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draw_tunnel(best_runway(apt));
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gui.popupTip(apt.id ~ " - \"" ~ apt.name ~ "\"", 6);
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}
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}
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settimer(func loop(id), INTERVAL);
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}
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var loopid = 0;
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_setlistener("/sim/signals/fdm-initialized", func {
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# remove top bar unless otherwise specified
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var top = props.initNode("/sim/model/geometry/square/top", 1, "BOOL");
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setlistener("/sim/rendering/glide-slope-tunnel", func(n) {
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loopid += 1;
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if (n.getValue()) {
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apt = nil;
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return loop(loopid);
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}
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forindex (var i; tunnel) {
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if (tunnel[i] != nil) {
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tunnel[i].remove();
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tunnel[i] = nil;
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}
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}
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}, 1);
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});
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