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- Oooops, sorry for that.

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abory 2009-05-04 11:12:52 +00:00
parent f5601ebf3a
commit 2bb2de3645
1 changed files with 16 additions and 56 deletions
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72
Nasal/tanker.nas
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@ -73,33 +73,6 @@ var identity = {
}, },
}; };
# functions to indicate the course [deg] (heading/ground) for a given heading [deg] (true heading) and ktas [kt]
# just adding wind.
var heading_to_course_dev = func(ktas, heading) {
var alpha = (getprop("/environment/wind-from-heading-deg") - heading - 180) * D2R;
var wind_speed = getprop("/environment/wind-speed-kt");
return math.atan2(math.sin(alpha) * wind_speed, ktas + math.cos(alpha) * wind_speed) * R2D;
}
var heading_to_course = func(ktas, heading) {
return geo.normdeg(heading + heading_to_course_dev(ktas, heading));
}
# functions to calculate the needed heading [deg] (true heading) to have a desired course on ground [deg]
# for a given ktas [kt] the speed is speed on the heading, not on the course.
# need some improvement to indicate that it's impossible if the wind is too strong, but don't know what to do for this :)
var course_to_heading_dev = func(ktas, course) {
var alpha = (getprop("/environment/wind-from-heading-deg") - course) * D2R;
var rapport = math.sin(alpha) * getprop("/environment/wind-speed-kt") / ktas;
if (rapport > 1) return 1000; # not sure what to return here to indicate wind will be too strong to achieve course
else return math.asin(rapport) * R2D;
}
var course_to_heading = func(ktas, course) {
return geo.normdeg(course + course_to_heading_dev(ktas, course));
}
var Tanker = { var Tanker = {
new: func(aiid, callsign, tacan, type, kias, heading, coord) { new: func(aiid, callsign, tacan, type, kias, heading, coord) {
@ -119,7 +92,6 @@ var Tanker = {
m.mode = "leg"; m.mode = "leg";
m.rollrate = 2; # deg/s m.rollrate = 2; # deg/s
m.maxbank = 25; m.maxbank = 25;
m.drift_angle = 0;
var n = props.globals.getNode("models", 1); var n = props.globals.getNode("models", 1);
for (var i = 0; 1; i += 1) for (var i = 0; 1; i += 1)
@ -178,22 +150,13 @@ var Tanker = {
if ((me.interval += dt) >= 5) { if ((me.interval += dt) >= 5) {
me.interval -= 5; me.interval -= 5;
if (me.mode == "leg") me.headwind = aircraft.wind_speed_from(me.course);
me.headwind = aircraft.wind_speed_from(me.course);
me.ktas = aircraft.kias_to_ktas(me.kias, alt); me.ktas = aircraft.kias_to_ktas(me.kias, alt);
} }
if (me.roll) { var distance = dt * (me.ktas - me.headwind) * NM2M / 3600;
me.headwind = aircraft.wind_speed_from(me.course); var deviation = me.roll ? 0.5 * dt * 1085.941 * math.tan(me.roll * D2R) / me.ktas : 0;
me.heading = me.heading - dt * 1085.941 * math.tan(me.roll * D2R) / me.ktas;
me.drift_angle = me.heading - me.course;
} else {
me.drift_angle = course_to_heading_dev(me.ktas, me.course);
me.heading = me.course + me.drift_angle;
}
var deviation = me.roll ? me.course - heading_to_course(me.ktas, me.heading) : 0;
var distance = dt * (me.ktas * math.cos(me.drift_angle * D2R) - me.headwind) * NM2M / 3600;
if (me.mode == "leg") { if (me.mode == "leg") {
if (me.lastmode != "leg") { if (me.lastmode != "leg") {
me.lastmode = "leg"; me.lastmode = "leg";
@ -207,7 +170,7 @@ var Tanker = {
me.roll_target = 0; me.roll_target = 0;
me.leg_warning = 0; me.leg_warning = 0;
} }
if ((me.leg_remaining -= distance) > 0) if ((me.leg_remaining -= distance) < 0)
me.mode = "turn"; me.mode = "turn";
} else { # me.mode == "turn" } else { # me.mode == "turn"
@ -220,20 +183,17 @@ var Tanker = {
if (!me.full_bank_turn_angle and me.roll >= me.roll_target) if (!me.full_bank_turn_angle and me.roll >= me.roll_target)
me.full_bank_turn_angle = geo.normdeg(180 - me.turn_remaining); me.full_bank_turn_angle = geo.normdeg(180 - me.turn_remaining);
#if (me.turn_remaining < me.full_bank_turn_angle) if (me.turn_remaining < me.full_bank_turn_angle)
# me.roll_target = 0; me.roll_target = 0;
#if ((me.turn_remaining -= deviation) < 0) { if ((me.turn_remaining -= deviation) < 0) {
# if (me.goal[1] == nil) # define tanker exit point (opposite of anchor point/ARCP) if (me.goal[1] == nil) # define tanker exit point (opposite of anchor point/ARCP)
# me.goal[1] = geo.Coord.new(me.coord).apply_course_distance(me.track_course - 180, me.goal[1] = geo.Coord.new(me.coord).apply_course_distance(me.track_course - 180,
# me.length); me.length);
# me.mode = "leg"; me.mode = "leg";
#} }
me.headwind = aircraft.wind_speed_from(me.course);
} }
me.coord.apply_course_distance(me.course -= deviation, distance); me.coord.apply_course_distance(me.course -= deviation, distance);
me.ac = geo.aircraft_position(); me.ac = geo.aircraft_position();
@ -246,7 +206,7 @@ var Tanker = {
me.latN.setDoubleValue(me.coord.lat()); me.latN.setDoubleValue(me.coord.lat());
me.lonN.setDoubleValue(me.coord.lon()); me.lonN.setDoubleValue(me.coord.lon());
me.altN.setDoubleValue(alt * M2FT); me.altN.setDoubleValue(alt * M2FT);
me.hdgN.setDoubleValue(me.heading); me.hdgN.setDoubleValue(me.heading = me.course);
me.pitchN.setDoubleValue(0); me.pitchN.setDoubleValue(0);
me.rollN.setDoubleValue(-me.roll); me.rollN.setDoubleValue(-me.roll);
me.ktasN.setDoubleValue(me.ktas); me.ktasN.setDoubleValue(me.ktas);
@ -301,6 +261,7 @@ var Tanker = {
}; };
var request = func { var request = func {
var tanker = values(Tanker.active); var tanker = values(Tanker.active);
if (size(tanker)) if (size(tanker))
@ -315,7 +276,7 @@ var request = func {
var hdg = getprop("orientation/heading-deg"); var hdg = getprop("orientation/heading-deg");
var course = hdg + (rand() - 0.5) * 60; var course = hdg + (rand() - 0.5) * 60;
var dist = 6000 + rand() * 4000; var dist = 6000 + rand() * 4000;
var alt = int(10 + rand() * 22) * 1000; # FL100--FL320 var alt = int(10 + rand() * 15) * 1000; # FL100--FL250
alt = skip_cloud_layer(alt * FT2M); alt = skip_cloud_layer(alt * FT2M);
var coord = geo.aircraft_position().apply_course_distance(course, dist).set_alt(alt); var coord = geo.aircraft_position().apply_course_distance(course, dist).set_alt(alt);
Tanker.new(aiid, callsign, tacanid, type, 250, hdg, coord); Tanker.new(aiid, callsign, tacanid, type, 250, hdg, coord);
@ -344,4 +305,3 @@ _setlistener("/sim/signals/nasal-dir-initialized", func {
setlistener("/sim/signals/reinit", reinit, 1); setlistener("/sim/signals/reinit", reinit, 1);
}); });