oprf_assets/ZSU-23/Nasal/fdm.nas
2022-11-25 01:36:41 +01:00

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# Copyright (C) 2015 onox
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#io.include("Aircraft/ExpansionPack/Nasal/init.nas");
#with("updateloop");
print("loading fdm");
# Number of iterations per second
var frequency = 60.0;
# Change in heading per second at full rudder deflection
var heading_ps = 20;
var time_last = 0;
var sim_speed = 1;
var distance = 0;
var speed = 15;
setprop("/carrier/sunk",0);
setprop("/orientation/pitch-deg", 0);
#var arrived = 0;
var PositionUpdater = func () {
settimer( PositionUpdater, 1/frequency );
var position = geo.aircraft_position();
#if ( arrived == 0 and getprop("/carrier/sunk") == 0 and getprop("/autopilot/route-manager/wp-last/dist") != nil and getprop("/autopilot/route-manager/wp-last/dist") < 1 ) {
#setprop("/sim/multiplay/chat",getprop("sim/multiplay/callsign") ~ " has arrived safely!");
# print("arrived");
# arrived = 1;
#return;
#}
var time_now = getprop("/sim/time/elapsed-sec");
var dt = (time_now - time_last) * sim_speed;
if (dt == 0) return;
time_last = time_now;
if ( getprop("/carrier/sunk") == 0 and getprop("/autopilot/route-manager/active") == 1 ) {
var cur_waypoint = getprop("/autopilot/route-manager/current-wp");
if (cur_waypoint > -1) {
var cur_wp_lon = getprop("/autopilot/route-manager/route/wp[" ~ cur_waypoint ~ "]/longitude-deg");
var cur_wp_lat = getprop("/autopilot/route-manager/route/wp[" ~ cur_waypoint ~ "]/latitude-deg");
var rm_destination = geo.Coord.new().set_latlon(cur_wp_lat,cur_wp_lon);
var heading = getprop("/orientation/heading-deg");
var course = position.course_to(rm_destination);
distance = speed * KT2MPS * dt;
var turn_max = heading_ps * dt;
var turn = math.clamp(geo.normdeg180(course-heading),-turn_max,turn_max);
heading += turn;
heading = geo.normdeg(heading);
position.apply_course_distance(heading, distance);
# Set new position
setprop("/position/latitude-deg", position.lat());
setprop("/position/longitude-deg", position.lon());
setprop("/orientation/heading-deg", heading);
setprop("velocities/groundspeed-kt",speed);
} else {
setprop("velocities/groundspeed-kt",0);
}
var g_alt = geo.elevation(position.lat(),position.lon());#getprop("/position/ground-elev-ft");
if (g_alt == nil) g_alt = 0;
g_alt *= M2FT;
var alt_diff = g_alt - getprop("/position/altitude-ft");
var pitch = math.atan2(alt_diff, distance*M2FT)*R2D;
setprop("/orientation/pitch-deg", pitch);
setprop("/position/altitude-ft",g_alt);
} else {
setprop("velocities/groundspeed-kt",0);
}
#set roll
setprop("/orientation/roll-deg", 0);
};
PositionUpdater();