#include "metarairportfilter.hxx"
#include <simgear/scene/sky/cloud.hxx>
#include <simgear/structure/exception.hxx>
+#include <simgear/misc/strutils.hxx>
+#include <simgear/magvar/magvar.hxx>
+#include <simgear/timing/sg_time.hxx>
#include <Main/fg_props.hxx>
using std::string;
static vector<string> coverage_string;
+/**
+ * @brief Helper class to wrap SGMagVar functionality and cache the variation and dip for
+ * a certain position.
+ */
+class MagneticVariation : public SGMagVar {
+public:
+ /**
+ * Constructor
+ */
+ MagneticVariation() : _lat(1), _lon(1), _alt(1) {
+ recalc( 0.0, 0.0, 0.0 );
+ }
+
+ /**
+ * @brief get the magnetic variation for a specific position at the current time
+ * @param lon the positions longitude in degrees
+ * @param lat the positions latitude in degrees
+ * @param alt the positions height above MSL (aka altitude) in feet
+ * @return the magnetic variation in degrees
+ */
+ double get_variation_deg( double lon, double lat, double alt );
+
+ /**
+ * @brief get the magnetic dip for a specific position at the current time
+ * @param lon the positions longitude in degrees
+ * @param lat the positions latitude in degrees
+ * @param alt the positions height above MSL (aka altitude) in feet
+ * @return the magnetic dip in degrees
+ */
+ double get_dip_deg( double lon, double lat, double alt );
+private:
+ void recalc( double lon, double lat, double alt );
+ SGTime _time;
+ double _lat, _lon, _alt;
+};
+
+inline void MagneticVariation::recalc( double lon, double lat, double alt )
+{
+ // calculation of magnetic variation is expensive. Cache the position
+ // and perform this calculation only if it has changed
+ if( _lon != lon || _lat != lat || _alt != alt ) {
+ SG_LOG(SG_ENVIRONMENT, SG_DEBUG, "Recalculating magvar for lon=" << lon << ", lat=" << lat << ", alt=" << alt );
+ _lon = lon;
+ _lat = lat;
+ _alt = alt;
+
+ lon *= SGD_DEGREES_TO_RADIANS;
+ lat *= SGD_DEGREES_TO_RADIANS;
+ alt *= SG_FEET_TO_METER;
+ _time.update( lon, lat, 0, 0 );
+ update( lon, lat, alt, _time.getJD() );
+ }
+}
+
+inline double MagneticVariation::get_variation_deg( double lon, double lat, double alt )
+{
+ recalc( lon, lat, alt );
+ return get_magvar() * SGD_RADIANS_TO_DEGREES;
+}
+
+inline double MagneticVariation::get_dip_deg( double lon, double lat, double alt )
+{
+ recalc( lon, lat, alt );
+ return get_magdip() * SGD_RADIANS_TO_DEGREES;
+}
+
MetarProperties::MetarProperties( SGPropertyNode_ptr rootNode ) :
_rootNode(rootNode),
_metarValidNode( rootNode->getNode( "valid", true ) ),
_rain(0.0),
_hail(0.0),
_snow(0.0),
- _snow_cover(false)
+ _snow_cover(false),
+ _magneticVariation(new MagneticVariation())
{
// Hack to avoid static initialization order problems on OSX
- if( coverage_string.size() == 0 ) {
+ if( coverage_string.empty() ) {
coverage_string.push_back(SGCloudLayer::SG_CLOUD_CLEAR_STRING);
coverage_string.push_back(SGCloudLayer::SG_CLOUD_FEW_STRING);
coverage_string.push_back(SGCloudLayer::SG_CLOUD_SCATTERED_STRING);
_metarValidNode->setBoolValue( false );
_tiedProperties.setRoot( _rootNode );
_tiedProperties.Tie("data", this, &MetarProperties::get_metar, &MetarProperties::set_metar );
- _tiedProperties.Tie("station-id", this, &MetarProperties::get_station_id );
+ _tiedProperties.Tie("station-id", this, &MetarProperties::get_station_id, &MetarProperties::set_station_id );
_tiedProperties.Tie("station-elevation-ft", &_station_elevation );
_tiedProperties.Tie("station-latitude-deg", &_station_latitude );
_tiedProperties.Tie("station-longitude-deg", &_station_longitude );
+ _tiedProperties.Tie("station-magnetic-variation-deg", this, &MetarProperties::get_magnetic_variation_deg );
+ _tiedProperties.Tie("station-magnetic-dip-deg", this, &MetarProperties::get_magnetic_dip_deg );
_tiedProperties.Tie("min-visibility-m", &_min_visibility );
_tiedProperties.Tie("max-visibility-m", &_max_visibility );
_tiedProperties.Tie("base-wind-range-from", &_base_wind_range_from );
_tiedProperties.Tie("base-wind-range-to", &_base_wind_range_to );
- _tiedProperties.Tie("base-wind-speed-kt", &_wind_speed );
- _tiedProperties.Tie("base-wind-dir-deg", &_base_wind_dir );
- _tiedProperties.Tie("base-wind-from-north-fps", &_wind_from_north_fps );
- _tiedProperties.Tie("base-wind-from-east-fps", &_wind_from_east_fps );
+ _tiedProperties.Tie("base-wind-speed-kt", this, &MetarProperties::get_wind_speed, &MetarProperties::set_wind_speed );
+ _tiedProperties.Tie("base-wind-dir-deg", this, &MetarProperties::get_base_wind_dir, &MetarProperties::set_base_wind_dir );
+ _tiedProperties.Tie("base-wind-from-north-fps", this, &MetarProperties::get_wind_from_north_fps, &MetarProperties::set_wind_from_north_fps );
+ _tiedProperties.Tie("base-wind-from-east-fps",this, &MetarProperties::get_wind_from_east_fps, &MetarProperties::set_wind_from_east_fps );
_tiedProperties.Tie("gust-wind-speed-kt", &_gusts );
_tiedProperties.Tie("temperature-degc", &_temperature );
_tiedProperties.Tie("dewpoint-degc", &_dewpoint );
MetarProperties::~MetarProperties()
{
+ delete _magneticVariation;
}
m = new FGMetar( _metar );
}
catch( sg_io_exception ) {
- SG_LOG( SG_GENERAL, SG_WARN, "Can't parse metar: " << _metar );
+ SG_LOG( SG_ENVIRONMENT, SG_WARN, "Can't parse metar: " << _metar );
_metarValidNode->setBoolValue(false);
return;
}
_decoded.clear();
const vector<string> weather = m->getWeather();
- for( vector<string>::const_iterator it = weather.begin(); it != weather.end(); it++ ) {
+ for( vector<string>::const_iterator it = weather.begin(); it != weather.end(); ++it ) {
if( false == _decoded.empty() ) _decoded.append(", ");
_decoded.append(*it);
}
vis->setDoubleValue("max-m", v);
}
- _base_wind_dir = m->getWindDir();
+ set_base_wind_dir(m->getWindDir());
_base_wind_range_from = m->getWindRangeFrom();
_base_wind_range_to = m->getWindRangeTo();
- _wind_speed = m->getWindSpeed_kt();
+ set_wind_speed(m->getWindSpeed_kt());
- double speed_fps = _wind_speed * SG_NM_TO_METER * SG_METER_TO_FEET / 3600.0;
- _wind_from_north_fps = speed_fps * cos((double)_base_wind_dir * SGD_DEGREES_TO_RADIANS);
- _wind_from_east_fps = speed_fps * sin((double)_base_wind_dir * SGD_DEGREES_TO_RADIANS);
_gusts = m->getGustSpeed_kt();
_temperature = m->getTemperature_C();
_dewpoint = m->getDewpoint_C();
}
}
- vector<SGMetarCloud> cv = m->getClouds();
- vector<SGMetarCloud>::const_iterator cloud, cloud_end = cv.end();
-
{
static const char * LAYER = "layer";
SGPropertyNode_ptr cloudsNode = _rootNode->getNode("clouds", true );
if( coverage != SGMetarCloud::COVERAGE_NIL ) {
// if there is a layer above the fog, limit the top to one foot below that layer's bottom
- if( metarClouds[0].getCoverage() != SGMetarCloud::COVERAGE_CLEAR )
+ if( metarClouds.size() > 0 && metarClouds[0].getCoverage() != SGMetarCloud::COVERAGE_CLEAR )
thickness = metarClouds[0].getAltitude_ft() - LAYER_BOTTOM_STATION_OFFSET - 1;
SGPropertyNode_ptr layerNode = cloudsNode->getChild(LAYER, 0, true );
-9999.0 :
metarClouds[i].getAltitude_ft() + _station_elevation;
+ layerNode->setDoubleValue( "alpha", 1.0 );
layerNode->setStringValue( "coverage", coverage_string[coverage] );
layerNode->setDoubleValue( "coverage-type", SGCloudLayer::getCoverageType(coverage_string[coverage]) );
layerNode->setDoubleValue( "elevation-ft", elevation );
_metarValidNode->setBoolValue(true);
}
+void MetarProperties::setStationId( const std::string & value )
+{
+ set_station_id(simgear::strutils::strip(value).c_str());
+}
+
+double MetarProperties::get_magnetic_variation_deg() const
+{
+ return _magneticVariation->get_variation_deg( _station_longitude, _station_latitude, _station_elevation );
+}
+
+double MetarProperties::get_magnetic_dip_deg() const
+{
+ return _magneticVariation->get_dip_deg( _station_longitude, _station_latitude, _station_elevation );
+}
+
+static inline void calc_wind_hs( double north_fps, double east_fps, int & heading_deg, double & speed_kt )
+{
+ speed_kt = sqrt((north_fps)*(north_fps)+(east_fps)*(east_fps)) * 3600.0 / (SG_NM_TO_METER * SG_METER_TO_FEET);
+ heading_deg = SGMiscd::roundToInt(
+ SGMiscd::normalizeAngle2( atan2( east_fps, north_fps ) ) * SGD_RADIANS_TO_DEGREES );
+}
+
+void MetarProperties::set_wind_from_north_fps( double value )
+{
+ _wind_from_north_fps = value;
+ calc_wind_hs( _wind_from_north_fps, _wind_from_east_fps, _base_wind_dir, _wind_speed );
+}
+
+void MetarProperties::set_wind_from_east_fps( double value )
+{
+ _wind_from_east_fps = value;
+ calc_wind_hs( _wind_from_north_fps, _wind_from_east_fps, _base_wind_dir, _wind_speed );
+}
+
+static inline void calc_wind_ne( double heading_deg, double speed_kt, double & north_fps, double & east_fps )
+{
+ double speed_fps = speed_kt * SG_NM_TO_METER * SG_METER_TO_FEET / 3600.0;
+ north_fps = speed_fps * cos(heading_deg * SGD_DEGREES_TO_RADIANS);
+ east_fps = speed_fps * sin(heading_deg * SGD_DEGREES_TO_RADIANS);
+}
+
+void MetarProperties::set_base_wind_dir( double value )
+{
+ _base_wind_dir = value;
+ calc_wind_ne( (double)_base_wind_dir, _wind_speed, _wind_from_north_fps, _wind_from_east_fps );
+}
+
+void MetarProperties::set_wind_speed( double value )
+{
+ _wind_speed = value;
+ calc_wind_ne( (double)_base_wind_dir, _wind_speed, _wind_from_north_fps, _wind_from_east_fps );
+}
+
+
} // namespace Environment
projects / flightgear.git / blobdiff