#include <Main/util.hxx>
#include <Scenery/scenery.hxx>
#include <string>
-#include <math.h>
-
+#include <cmath>
+#include <simgear/sg_inlines.h>
using std::string;
#include "ridge_lift.hxx"
-static string CreateIndexedPropertyName(string Property, int index)
-{
- std::stringstream str;
- str << index;
- string tmp;
- str >> tmp;
- return Property + "[" + tmp + "]";
-}
-
-static inline double sign(double x) {
- return x == 0 ? 0 : x > 0 ? 1.0 : -1.0;
-}
+static const double BOUNDARY1_m = 40.0;
-static const double BOUNDARY1_m = 40.0;
+const double FGRidgeLift::dist_probe_m[] = { // in meters
+ 0.0,
+ 250.0,
+ 750.0,
+ 2000.0,
+ -100.0
+};
//constructor
-FGRidgeLift::FGRidgeLift ()
+FGRidgeLift::FGRidgeLift () :
+ lift_factor(0.0)
{
- dist_probe_m[0] = 0.0; // in meters
- dist_probe_m[1] = 250.0;
- dist_probe_m[2] = 750.0;
- dist_probe_m[3] = 2000.0;
- dist_probe_m[4] = -100.0;
-
strength = 0.0;
timer = 0.0;
+ for( int i = 0; i < 5; i++ )
+ probe_elev_m[i] = probe_lat_deg[i] = probe_lon_deg[i] = 0.0;
+
+ for( int i = 0; i < 4; i++ )
+ slope[i] = 0.0;
}
//destructor
void FGRidgeLift::init(void)
{
+ _enabled_node = fgGetNode( "/environment/ridge-lift/enabled", false );
+
_ridge_lift_fps_node = fgGetNode("/environment/ridge-lift-fps", true);
_surface_wind_from_deg_node =
fgGetNode("/environment/config/boundary/entry[0]/wind-from-heading-deg"
_surface_wind_speed_node =
fgGetNode("/environment/config/boundary/entry[0]/wind-speed-kt"
, true);
- _earth_radius_node = fgGetNode("/position/sea-level-radius-ft", true);
_user_longitude_node = fgGetNode("/position/longitude-deg", true);
_user_latitude_node = fgGetNode("/position/latitude-deg", true);
- _user_altitude_ft_node = fgGetNode("/position/altitude-ft", true);
_user_altitude_agl_ft_node = fgGetNode("/position/altitude-agl-ft", true);
+ _ground_elev_node = fgGetNode("/position/ground-elev-ft", true );
}
void FGRidgeLift::bind() {
string prop;
+ _tiedProperties.setRoot( fgGetNode("/environment/ridge-lift",true));
for( int i = 0; i < 5; i++ ) {
- prop = CreateIndexedPropertyName("/environment/ridge-lift/probe-elev-m", i );
- fgTie( prop.c_str(), this, i, &FGRidgeLift::get_probe_elev_m); // read-only
-
- prop = CreateIndexedPropertyName("/environment/ridge-lift/probe-lat-deg", i );
- fgTie( prop.c_str(), this, i, &FGRidgeLift::get_probe_lat_deg); // read-only
-
- prop = CreateIndexedPropertyName("/environment/ridge-lift/probe-lon-deg", i );
- fgTie( prop.c_str(), this, i, &FGRidgeLift::get_probe_lon_deg); // read-only
+ _tiedProperties.Tie( "probe-elev-m", i, this, i, &FGRidgeLift::get_probe_elev_m );
+ _tiedProperties.Tie( "probe-lat-deg", i, this, i, &FGRidgeLift::get_probe_lat_deg );
+ _tiedProperties.Tie( "probe-lon-deg", i, this, i, &FGRidgeLift::get_probe_lon_deg );
}
for( int i = 0; i < 4; i++ ) {
- prop = CreateIndexedPropertyName("/environment/ridge-lift/slope", i );
- fgTie( prop.c_str(), this, i, &FGRidgeLift::get_slope); // read-only
+ _tiedProperties.Tie( "slope", i, this, i, &FGRidgeLift::get_slope );
}
}
void FGRidgeLift::unbind() {
- string prop;
-
- for( int i = 0; i < 5; i++ ) {
-
- prop = CreateIndexedPropertyName("/environment/ridge-lift/probe-elev-m", i );
- fgUntie( prop.c_str() );
-
- prop = CreateIndexedPropertyName("/environment/ridge-lift/probe-lat-deg", i );
- fgUntie( prop.c_str() );
-
- prop = CreateIndexedPropertyName("/environment/ridge-lift/probe-lon-deg", i );
- fgUntie( prop.c_str() );
- }
-
- for( int i = 0; i < 4; i++ ) {
- prop = CreateIndexedPropertyName("/environment/ridge-lift/slope", i );
- fgUntie( prop.c_str() );
- }
+ _tiedProperties.Untie();
}
void FGRidgeLift::update(double dt) {
- //get the windspeed at ground level
+ if( dt <= SGLimitsd::min() ) // paused, do nothing but keep current lift
+ return;
- double ground_wind_from_rad = _surface_wind_from_deg_node->getDoubleValue() * SG_DEGREES_TO_RADIANS;
- double ground_wind_speed_mps = _surface_wind_speed_node->getDoubleValue() * SG_NM_TO_METER / 3600;
+ if( _enabled_node && false == _enabled_node->getBoolValue() ) {
+ // do nothing if lift has been zeroed
+ if( strength != 0.0 ) {
+ if( strength > 0.1 ) {
+ // slowly fade out strong lifts
+ strength = fgGetLowPass( strength, 0, dt );
+ } else {
+ strength = 0.0;
+ }
+ _ridge_lift_fps_node->setDoubleValue( strength );
+ }
+ return;
+ }
timer -= dt;
if (timer <= 0.0 ) {
- // copy values
- double user_latitude_rad = _user_latitude_node->getDoubleValue() * SG_DEGREES_TO_RADIANS;
- double user_longitude_rad = _user_longitude_node->getDoubleValue() * SG_DEGREES_TO_RADIANS;
-
- double earth_rad_m = _earth_radius_node->getDoubleValue() * SG_FEET_TO_METER;
- if( earth_rad_m < SG_EPSILON )
- earth_rad_m = SG_EARTH_RAD * 1000;
-
- // Placing the probes
-
- for (int i = 0; i < sizeof(probe_lat_rad)/sizeof(probe_lat_rad[0]); i++) {
- double probe_radius_ratio = dist_probe_m[i]/earth_rad_m;
-
- probe_lat_rad[i] = asin(sin(user_latitude_rad)*cos(probe_radius_ratio)
- +cos(user_latitude_rad)*sin(probe_radius_ratio)*cos(ground_wind_from_rad));
- if (probe_lat_rad[i] < SG_EPSILON ) {
- probe_lon_rad[i] = user_latitude_rad; // probe on a pole
- } else {
- probe_lon_rad[i] = fmod((user_longitude_rad+asin(sin(ground_wind_from_rad)
- *sin(probe_radius_ratio)/cos(probe_lat_rad[i]))+SG_PI)
- ,SGD_2PI)-SG_PI;
- }
- probe_lat_deg[i]= probe_lat_rad[i] * SG_RADIANS_TO_DEGREES;
- probe_lon_deg[i]= probe_lon_rad[i] * SG_RADIANS_TO_DEGREES;
- }
-
- for (int i = 0; i < sizeof(probe_elev_m)/sizeof(probe_elev_m[0]); i++) {
- double elevation = 0;
- if (globals->get_scenery()->get_elevation_m(SGGeod::fromGeodM(
- SGGeod::fromRad(probe_lon_rad[i],probe_lat_rad[i]), 20000), elevation, 0)) {
- if ( elevation > 0.1 ) {
- probe_elev_m[i] = elevation;
- } else {
- probe_elev_m[i] = 0.1 ;
- }
- } else {
- probe_elev_m[i] = 0.1;
+ // probe0 is current position
+ probe_lat_deg[0] = _user_latitude_node->getDoubleValue();
+ probe_lon_deg[0] = _user_longitude_node->getDoubleValue();
+ probe_elev_m[0] = _ground_elev_node->getDoubleValue() * SG_FEET_TO_METER;
+
+ // position is geodetic, need geocentric for advanceRadM
+ SGGeod myGeodPos = SGGeod::fromDegM( probe_lon_deg[0], probe_lat_deg[0], 20000.0 );
+ SGGeoc myGeocPos = SGGeoc::fromGeod( myGeodPos );
+ double ground_wind_from_rad = _surface_wind_from_deg_node->getDoubleValue() * SG_DEGREES_TO_RADIANS;
+
+ // compute the remaining probes
+ for (unsigned i = 1; i < sizeof(probe_elev_m)/sizeof(probe_elev_m[0]); i++) {
+ SGGeoc probe = myGeocPos.advanceRadM( ground_wind_from_rad, dist_probe_m[i] );
+ // convert to geodetic position for ground level computation
+ SGGeod probeGeod = SGGeod::fromGeoc( probe );
+ probe_lat_deg[i] = probeGeod.getLatitudeDeg();
+ probe_lon_deg[i] = probeGeod.getLongitudeDeg();
+ if (!globals->get_scenery()->get_elevation_m( probeGeod, probe_elev_m[i], NULL )) {
+ // no ground found? use elevation of previous probe :-(
+ probe_elev_m[i] = probe_elev_m[i-1];
}
}
// slopes
- double adj_slope[4];
+ double adj_slope[sizeof(slope)];
slope[0] = (probe_elev_m[0] - probe_elev_m[1]) / dist_probe_m[1];
slope[1] = (probe_elev_m[1] - probe_elev_m[2]) / dist_probe_m[2];
slope[2] = (probe_elev_m[2] - probe_elev_m[3]) / dist_probe_m[3];
slope[3] = (probe_elev_m[4] - probe_elev_m[0]) / -dist_probe_m[4];
- for (int i = 0; i < sizeof(slope)/sizeof(slope[0]); i++)
- adj_slope[i] = sin(atan(5.0 * pow ( (fabs(slope[i])),1.7) ) ) *sign(slope[i]);
+ for (unsigned i = 0; i < sizeof(slope)/sizeof(slope[0]); i++)
+ adj_slope[i] = sin(atan(5.0 * pow ( (fabs(slope[i])),1.7) ) ) *SG_SIGN<double>(slope[i]);
//adjustment
- adj_slope[0] = 0.2 * adj_slope[0];
- adj_slope[1] = 0.2 * adj_slope[1];
+ adj_slope[0] *= 0.2;
+ adj_slope[1] *= 0.2;
if ( adj_slope [2] < 0.0 ) {
- adj_slope[2] = 0.5 * adj_slope[2];
+ adj_slope[2] *= 0.5;
} else {
adj_slope[2] = 0.0 ;
}
if ( ( adj_slope [0] >= 0.0 ) && ( adj_slope [3] < 0.0 ) ) {
adj_slope[3] = 0.0;
} else {
- adj_slope[3] = 0.2 * adj_slope[3];
+ adj_slope[3] *= 0.2;
}
lift_factor = adj_slope[0]+adj_slope[1]+adj_slope[2]+adj_slope[3];
//boundaries
double boundary2_m = 130.0; // in the lift
if (lift_factor < 0.0) { // in the sink
- double highest_probe_temp= max ( probe_elev_m[1], probe_elev_m[2] );
- double highest_probe_downwind_m= max ( highest_probe_temp, probe_elev_m[3] );
+ double highest_probe_temp= std::max ( probe_elev_m[1], probe_elev_m[2] );
+ double highest_probe_downwind_m= std::max ( highest_probe_temp, probe_elev_m[3] );
boundary2_m = highest_probe_downwind_m - probe_elev_m[0];
}
agl_factor = 1.0;
} else {
agl_factor = exp(-(2 + probe_elev_m[0] / 2000) *
- (user_altitude_agl_m - boundary2_m) / max(probe_elev_m[0],200.0));
+ (user_altitude_agl_m - boundary2_m) / std::max(probe_elev_m[0],200.0));
}
+ double ground_wind_speed_mps = _surface_wind_speed_node->getDoubleValue() * SG_NM_TO_METER / 3600;
double lift_mps = lift_factor* ground_wind_speed_mps * agl_factor;
//the updraft, finally, in ft per second
strength = fgGetLowPass( strength, lift_mps * SG_METER_TO_FEET, dt );
-// if(isnan(strength)) strength=0;
- _ridge_lift_fps_node->setDoubleValue( strength );
+ _ridge_lift_fps_node->setDoubleValue( strength );
}
projects / flightgear.git / blobdiff