136 lines
3.4 KiB
Text
136 lines
3.4 KiB
Text
# Draw 3 degree glide slope tunnel for the nearest airport's most suitable runway
|
|
# considering wind direction and runway size.
|
|
# Activate with --prop:sim/rendering/glide-slope-tunnel=1
|
|
|
|
var MARKER = "Models/Geometry/square.xml"; # tunnel marker
|
|
var DIST = 1000; # distance between markers
|
|
var NUM = 30; # number of tunnel markers
|
|
var ANGLE = 3 * math.pi / 180; # glide slope angle in radian
|
|
var HOFFSET = 274; # distance between begin of runway and touchdown area (900 ft)
|
|
var INTERVAL = 5; # check for nearest airport
|
|
|
|
var voffset = DIST * math.sin(ANGLE) / math.cos(ANGLE);
|
|
var apt = nil;
|
|
var tunnel = [];
|
|
setsize(tunnel, NUM);
|
|
|
|
|
|
var normdeg = func(a) {
|
|
while (a >= 180)
|
|
a -= 360;
|
|
while (a < -180)
|
|
a += 360;
|
|
return a;
|
|
}
|
|
|
|
|
|
# For each runway complement the opposite end, as airportinfo() returns only one end.
|
|
#
|
|
var complement_runways = func(apt) {
|
|
foreach (var rwy; keys(apt.runways)) {
|
|
if (!string.isdigit(rwy[0]))
|
|
continue;
|
|
|
|
var number = math.mod(num(substr(rwy, 0, 2)) + 18, 36);
|
|
var side = substr(rwy, 2, 1);
|
|
var comp = sprintf("%02d%s", number, side == "R" ? "L" : side == "L" ? "R" : side);
|
|
var r = apt.runways[rwy];
|
|
apt.runways[comp] = { lat: r.lat, lon: r.lon, length: r.length,
|
|
width: r.width, heading: math.mod(r.heading + 180, 360),
|
|
threshold1: r.threshold2,
|
|
#threshold2: r.threshold1
|
|
#stopway1: r.stopway2, stopway2: r.stopway1,
|
|
};
|
|
}
|
|
}
|
|
|
|
|
|
# Find best runway for current wind direction (or 270), also considering length and width.
|
|
#
|
|
var best_runway = func(apt) {
|
|
var wind_speed = getprop("/environment/wind-speed-kt");
|
|
var wind_from = wind_speed ? getprop("/environment/wind-from-heading-deg") : 270;
|
|
var max = -1;
|
|
var rwy = nil;
|
|
|
|
foreach (var r; keys(apt.runways)) {
|
|
var curr = apt.runways[r];
|
|
var deviation = math.abs(normdeg(wind_from - curr.heading)) + 1e-20;
|
|
var v = (0.01 * curr.length + 0.01 * curr.width) / deviation;
|
|
|
|
if (v > max) {
|
|
max = v;
|
|
rwy = curr;
|
|
}
|
|
}
|
|
return rwy;
|
|
}
|
|
|
|
|
|
# Draw 3 degree glide slope tunnel.
|
|
#
|
|
var draw_tunnel = func(rwy) {
|
|
var m = geo.Coord.new().set_latlon(rwy.lat, rwy.lon);
|
|
m.apply_course_distance(rwy.heading + 180, rwy.length / 2 - rwy.threshold1 - HOFFSET);
|
|
|
|
var g = geodinfo(m.lat(), m.lon());
|
|
var elev = g != nil ? g[0] : apt.elevation;
|
|
forindex (var i; tunnel) {
|
|
if (tunnel[i] != nil)
|
|
tunnel[i].remove();
|
|
|
|
m.set_alt(elev);
|
|
tunnel[i] = geo.put_model(MARKER, m, rwy.heading);
|
|
m.apply_course_distance(rwy.heading + 180, DIST);
|
|
elev += voffset;
|
|
}
|
|
}
|
|
|
|
|
|
var loop = func(id) {
|
|
id == loopid or return;
|
|
var a = airportinfo();
|
|
if (apt == nil or apt.id != a.id) {
|
|
apt = a;
|
|
var is_heliport = 1;
|
|
foreach (var rwy; keys(apt.runways))
|
|
if (rwy[0] != `H`)
|
|
is_heliport = 0;
|
|
|
|
if (is_heliport) {
|
|
#print(apt.id, " -- \"", apt.name, "\" --> heliport; ignored");
|
|
} else {
|
|
complement_runways(apt);
|
|
draw_tunnel(best_runway(apt));
|
|
#print(apt.id, " -- \"", apt.name, "\"");
|
|
}
|
|
}
|
|
settimer(func { loop(id) }, INTERVAL);
|
|
}
|
|
|
|
|
|
var loopid = 0;
|
|
|
|
settimer(func {
|
|
var top = props.globals.getNode("/sim/model/geometry/square/top", 1);
|
|
if (top.getType() == "NONE")
|
|
top.setBoolValue(1); # remove top bar unless otherwise specified
|
|
|
|
setlistener("/sim/rendering/glide-slope-tunnel", func(n) {
|
|
loopid += 1;
|
|
if (n.getValue()) {
|
|
apt = nil;
|
|
loop(loopid);
|
|
} else {
|
|
forindex (var i; tunnel) {
|
|
if (tunnel[i] != nil) {
|
|
tunnel[i].remove();
|
|
tunnel[i] = nil;
|
|
}
|
|
}
|
|
}
|
|
|
|
}, 1);
|
|
}, 0);
|
|
|
|
|