--- /dev/null
+// Build a cloud layer based on metar
+//
+// Written by Harald JOHNSEN, started April 2005.
+//
+// Copyright (C) 2005 Harald JOHNSEN - hjohnsen@evc.net
+//
+// 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 2 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, write to the Free Software
+// Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
+//
+//
+
+#include <Main/fg_props.hxx>
+
+#include <simgear/constants.h>
+#include <simgear/sound/soundmgr_openal.hxx>
+#include <simgear/scene/sky/sky.hxx>
+#include <simgear/environment/visual_enviro.hxx>
+#include <simgear/scene/sky/cloudfield.hxx>
+#include <simgear/scene/sky/newcloud.hxx>
+#include <simgear/math/sg_random.h>
+#include <Main/globals.hxx>
+#include <Airports/simple.hxx>
+#include <Main/util.hxx>
+
+#include "environment_mgr.hxx"
+#include "fgmetar.hxx"
+#include "fgclouds.hxx"
+
+extern SGSky *thesky;
+
+
+FGClouds::FGClouds() :
+ station_elevation_ft(0.0),
+ snd_lightning(NULL)
+{
+ update_event = 0;
+ fgSetString("/environment/weather-scenario", "METAR");
+}
+FGClouds::~FGClouds() {
+}
+
+int FGClouds::get_update_event(void) const {
+ return update_event;
+}
+void FGClouds::set_update_event(int count) {
+ update_event = count;
+ build();
+}
+
+void FGClouds::init(void) {
+ if( snd_lightning == NULL ) {
+ snd_lightning = new SGSoundSample(globals->get_fg_root().c_str(), "Sounds/thunder.wav", true);
+ snd_lightning->set_max_dist(7000.0f);
+ snd_lightning->set_reference_dist(3000.0f);
+ SGSoundMgr *soundMgr = globals->get_soundmgr();
+ soundMgr->add( snd_lightning, "thunder" );
+ sgEnviro.set_soundMgr( soundMgr );
+ }
+}
+
+SGNewCloud *FGClouds::buildCloud(SGPropertyNode *cloud_def_root, string name) {
+ SGPropertyNode *cld_def=NULL;
+
+ cld_def = cloud_def_root->getChild(name.c_str());
+ string base_name = name.substr(0,2);
+ if( !cld_def ) {
+ if( name[2] == '-' ) {
+ cld_def = cloud_def_root->getChild(base_name.c_str());
+ }
+ if( !cld_def )
+ return NULL;
+ }
+ string familly = cld_def->getStringValue("familly", base_name.c_str());
+ SGNewCloud *cld = new SGNewCloud(familly);
+ for(int i = 0; i < cld_def->nChildren() ; i++) {
+ SGPropertyNode *abox = cld_def->getChild(i);
+ if( strcmp(abox->getName(), "box") == 0) {
+ double x = abox->getDoubleValue("x");
+ double y = abox->getDoubleValue("y");
+ double z = abox->getDoubleValue("z");
+ double size = abox->getDoubleValue("size");
+ int type = abox->getIntValue("type", SGNewCloud::CLbox_standard);
+ cld->addContainer(x, y, z, size, (SGNewCloud::CLbox_type) type);
+ }
+ }
+ cld->genSprites();
+ return cld;
+}
+
+void FGClouds::buildLayer(SGCloudField *layer, string name, double alt, double coverage) {
+ struct {
+ string name;
+ double count;
+ } tCloudVariety[20];
+ int CloudVarietyCount = 0;
+ double totalCount = 0.0;
+
+ SGPropertyNode *cloud_def_root = fgGetNode("/environment/config/cloudlayers/clouds", false);
+ SGPropertyNode *layer_def_root = fgGetNode("/environment/config/cloudlayers/layers", false);
+
+ layer->clear();
+ // when we don't generate clouds the layer is rendered in 2D
+ if( coverage == 0.0 )
+ return;
+ if( layer_def_root == NULL || cloud_def_root == NULL)
+ return;
+ if( name == "ci" || name == "sc" || name == "st")
+ return;
+
+ SGPropertyNode *layer_def=NULL;
+
+ layer_def = layer_def_root->getChild(name.c_str());
+ if( !layer_def ) {
+ if( name[2] == '-' ) {
+ string base_name = name.substr(0,2);
+ layer_def = layer_def_root->getChild(base_name.c_str());
+ }
+ if( !layer_def )
+ return;
+ }
+
+ double grid_x_size = layer_def->getDoubleValue("grid-x-size", 1000.0);
+ double grid_y_size = layer_def->getDoubleValue("grid-y-size", 1000.0);
+ double grid_x_rand = layer_def->getDoubleValue("grid-x-rand", grid_x_size);
+ double grid_y_rand = layer_def->getDoubleValue("grid-y-rand", grid_y_size);
+ double grid_z_rand = layer_def->getDoubleValue("grid-z-rand");
+
+ for(int i = 0; i < layer_def->nChildren() ; i++) {
+ SGPropertyNode *acloud = layer_def->getChild(i);
+ if( strcmp(acloud->getName(), "cloud") == 0) {
+ string cloud_name = acloud->getStringValue("name");
+ tCloudVariety[CloudVarietyCount].name = cloud_name;
+ double count = acloud->getDoubleValue("count", 1.0);
+ tCloudVariety[CloudVarietyCount].count = count;
+ int variety = 0;
+ cloud_name = cloud_name + "-%d";
+ char variety_name[50];
+ do {
+ variety++;
+ snprintf(variety_name, sizeof(variety_name), cloud_name.c_str(), variety);
+ } while( cloud_def_root->getChild(variety_name, 0, false) );
+
+ totalCount += count;
+ if( CloudVarietyCount < 20 )
+ CloudVarietyCount++;
+ }
+ }
+ totalCount = 1.0 / totalCount;
+ double currCoverage = 0.0;
+
+ for(double px = 0.0; px < SGCloudField::fieldSize; px += grid_x_size) {
+ for(double py = 0.0; py < SGCloudField::fieldSize; py += grid_y_size) {
+ double x = px + grid_x_rand * (sg_random() - 0.5);
+ double y = py + grid_y_rand * (sg_random() - 0.5);
+ double z = alt + grid_z_rand * (sg_random() - 0.5);
+ double choice = sg_random();
+ currCoverage += coverage;
+ if( currCoverage < 1.0 )
+ continue;
+ currCoverage -= 1.0;
+
+ for(int i = 0; i < CloudVarietyCount ; i ++) {
+ choice -= tCloudVariety[i].count * totalCount;
+ if( choice <= 0.0 ) {
+ SGNewCloud *cld = buildCloud(cloud_def_root, tCloudVariety[i].name);
+ sgVec3 pos={x,z,y};
+ if( cld )
+ layer->addCloud(pos, cld);
+
+ break;
+ }
+ }
+ }
+ }
+
+}
+
+// TODO:call this after real metar updates
+void FGClouds::buildMETAR(void) {
+ SGPropertyNode *metar_root = fgGetNode("/environment", true);
+
+ double wind_speed_kt = metar_root->getDoubleValue("wind-speed-kt");
+ double temperature_degc = metar_root->getDoubleValue("temperature-sea-level-degc");
+ double dewpoint_degc = metar_root->getDoubleValue("dewpoint-sea-level-degc");
+ double pressure_mb = metar_root->getDoubleValue("pressure-sea-level-inhg") * SG_INHG_TO_PA / 100.0;
+
+ double dewp = pow(10.0, 7.5 * dewpoint_degc / (237.7 + dewpoint_degc));
+ double temp = pow(10.0, 7.5 * temperature_degc / (237.7 + temperature_degc));
+ double rel_humidity = dewp * 100 / temp;
+
+ // formule d'Epsy, base d'un cumulus
+ double cumulus_base = 122.0 * (temperature_degc - dewpoint_degc);
+ double stratus_base = 100.0 * (100.0 - rel_humidity) * SG_FEET_TO_METER;
+
+ bool cu_seen = false;
+
+ for(int iLayer = 0 ; iLayer < thesky->get_cloud_layer_count(); iLayer++) {
+ SGPropertyNode *cloud_root = fgGetNode("/environment/clouds/layer", iLayer, true);
+
+ double alt_ft = cloud_root->getDoubleValue("elevation-ft");
+ double alt_m = alt_ft * SG_FEET_TO_METER;
+ string coverage = cloud_root->getStringValue("coverage");
+ double coverage_norm = 0.0;
+ if( coverage == "few" )
+ coverage_norm = 2.0/8.0; // <1-2
+ else if( coverage == "scattered" )
+ coverage_norm = 4.0/8.0; // 3-4
+ else if( coverage == "broken" )
+ coverage_norm = 6.0/8.0; // 5-7
+ else if( coverage == "overcast" )
+ coverage_norm = 8.0/8.0; // 8
+
+ string layer_type = "nn";
+ if( coverage == "cirrus" ) {
+ layer_type = "ci";
+ } else if( alt_ft > 16500 ) {
+// layer_type = "ci|cs|cc";
+ layer_type = "ci";
+ } else if( alt_ft > 6500 ) {
+// layer_type = "as|ac|ns";
+ layer_type = "ac";
+ if( pressure_mb < 1005.0 && coverage_norm >= 5.5 )
+ layer_type = "ns";
+ } else {
+// layer_type = "st|cu|cb|sc";
+ // +/- 20% from stratus probable base
+ if( stratus_base * 0.80 < alt_m && stratus_base * 1.40 > alt_m )
+ layer_type = "st";
+ // +/- 20% from cumulus probable base
+ else if( cumulus_base * 0.80 < alt_m && cumulus_base * 1.20 > alt_m )
+ layer_type = "cu";
+ else {
+ // above formulae is far from perfect
+ if ( alt_ft < 2000 )
+ layer_type = "st";
+ else if( alt_ft < 4500 )
+ layer_type = "cu";
+ else
+ layer_type = "sc";
+ }
+ }
+
+ SGCloudField *layer3D = thesky->get_cloud_layer(iLayer)->get_layer3D();
+ buildLayer(layer3D, layer_type, alt_m, coverage_norm);
+ }
+}
+
+// copy from FGMetarEnvironmentCtrl until better
+void
+FGClouds::update_metar_properties( FGMetar *m )
+{
+ int i;
+ double d;
+ char s[128];
+
+ fgSetString("/environment/metar/station-id", m->getId());
+ fgSetDouble("/environment/metar/min-visibility-m",
+ m->getMinVisibility().getVisibility_m() );
+ fgSetDouble("/environment/metar/max-visibility-m",
+ m->getMaxVisibility().getVisibility_m() );
+
+ SGMetarVisibility *dirvis = m->getDirVisibility();
+ for (i = 0; i < 8; i++, dirvis++) {
+ const char *min = "/environment/metar/visibility[%d]/min-m";
+ const char *max = "/environment/metar/visibility[%d]/max-m";
+
+ d = dirvis->getVisibility_m();
+
+ snprintf(s, 128, min, i);
+ fgSetDouble(s, d);
+ snprintf(s, 128, max, i);
+ fgSetDouble(s, d);
+ }
+
+ fgSetInt("/environment/metar/base-wind-range-from",
+ m->getWindRangeFrom() );
+ fgSetInt("/environment/metar/base-wind-range-to",
+ m->getWindRangeTo() );
+ fgSetDouble("/environment/metar/base-wind-speed-kt",
+ m->getWindSpeed_kt() );
+ fgSetDouble("/environment/metar/gust-wind-speed-kt",
+ m->getGustSpeed_kt() );
+ fgSetDouble("/environment/metar/temperature-degc",
+ m->getTemperature_C() );
+ fgSetDouble("/environment/metar/dewpoint-degc",
+ m->getDewpoint_C() );
+ fgSetDouble("/environment/metar/rel-humidity-norm",
+ m->getRelHumidity() );
+ fgSetDouble("/environment/metar/pressure-inhg",
+ m->getPressure_inHg() );
+
+ vector<SGMetarCloud> cv = m->getClouds();
+ vector<SGMetarCloud>::iterator cloud;
+
+ const char *cl = "/environment/clouds/layer[%i]";
+ for (i = 0, cloud = cv.begin(); cloud != cv.end(); cloud++, i++) {
+ const char *coverage_string[5] =
+ { "clear", "few", "scattered", "broken", "overcast" };
+ const double thickness[5] = { 0, 65, 600,750, 1000};
+ int q;
+
+ snprintf(s, 128, cl, i);
+ strncat(s, "/coverage", 128);
+ q = cloud->getCoverage();
+ fgSetString(s, coverage_string[q] );
+
+ snprintf(s, 128, cl, i);
+ strncat(s, "/elevation-ft", 128);
+ fgSetDouble(s, cloud->getAltitude_ft() + station_elevation_ft);
+
+ snprintf(s, 128, cl, i);
+ strncat(s, "/thickness-ft", 128);
+ fgSetDouble(s, thickness[q]);
+
+ snprintf(s, 128, cl, i);
+ strncat(s, "/span-m", 128);
+ fgSetDouble(s, 40000.0);
+ }
+
+ for (; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
+ snprintf(s, 128, cl, i);
+ strncat(s, "/coverage", 128);
+ fgSetString(s, "clear");
+
+ snprintf(s, 128, cl, i);
+ strncat(s, "/elevation-ft", 128);
+ fgSetDouble(s, -9999);
+
+ snprintf(s, 128, cl, i);
+ strncat(s, "/thickness-ft", 128);
+ fgSetDouble(s, 0);
+
+ snprintf(s, 128, cl, i);
+ strncat(s, "/span-m", 128);
+ fgSetDouble(s, 40000.0);
+ }
+
+ fgSetDouble("/environment/metar/rain-norm", m->getRain());
+ fgSetDouble("/environment/metar/hail-norm", m->getHail());
+ fgSetDouble("/environment/metar/snow-norm", m->getSnow());
+ fgSetBool("/environment/metar/snow-cover", m->getSnowCover());
+}
+
+void
+FGClouds::update_env_config ()
+{
+ fgSetupWind( fgGetDouble("/environment/metar/base-wind-range-from"),
+ fgGetDouble("/environment/metar/base-wind-range-to"),
+ fgGetDouble("/environment/metar/base-wind-speed-kt"),
+ fgGetDouble("/environment/metar/gust-wind-speed-kt") );
+
+ fgDefaultWeatherValue( "visibility-m",
+ fgGetDouble("/environment/metar/min-visibility-m") );
+#if 0
+ set_temp_at_altitude( fgGetDouble("/environment/metar/temperature-degc"),
+ station_elevation_ft );
+ set_dewpoint_at_altitude( fgGetDouble("/environment/metar/dewpoint-degc"),
+ station_elevation_ft );
+#endif
+ fgDefaultWeatherValue( "pressure-sea-level-inhg",
+ fgGetDouble("/environment/metar/pressure-inhg") );
+}
+
+
+void FGClouds::setLayer( int iLayer, float alt_ft, string coverage, string layer_type ) {
+ double coverage_norm = 0.0;
+ if( coverage == "few" )
+ coverage_norm = 2.0/8.0; // <1-2
+ else if( coverage == "scattered" )
+ coverage_norm = 4.0/8.0; // 3-4
+ else if( coverage == "broken" )
+ coverage_norm = 6.0/8.0; // 5-7
+ else if( coverage == "overcast" )
+ coverage_norm = 8.0/8.0; // 8
+
+ SGCloudField *layer3D = thesky->get_cloud_layer(iLayer)->get_layer3D();
+ buildLayer(layer3D, layer_type, station_elevation_ft + alt_ft * SG_FEET_TO_METER, coverage_norm);
+}
+
+void FGClouds::buildScenario( string scenario ) {
+ string fakeMetar="";
+ string station = fgGetString("/environment/metar/station-id", "XXXX");
+
+ // fetch station elevation if exists
+ FGAirport a = globals->get_airports()->search( station );
+ station_elevation_ft = a.getElevation();
+
+ for(int iLayer = 0 ; iLayer < thesky->get_cloud_layer_count(); iLayer++) {
+ thesky->get_cloud_layer(iLayer)->get_layer3D()->clear();
+ }
+
+ station += " 011000Z ";
+ if( scenario == "Fair weather" ) {
+ fakeMetar = "15003KT 12SM SCT033 FEW200 20/08 Q1015 NOSIG";
+ setLayer(0, 3300.0, "scattered", "cu");
+ } else if( scenario == "Thunderstorm" ) {
+ fakeMetar = "15012KT 08SM TSRA SCT040 BKN070 20/12 Q0995";
+ setLayer(0, 4000.0, "scattered", "cb");
+ setLayer(1, 7000.0, "scattered", "ns");
+ } else
+ return;
+ FGMetar *m = new FGMetar( station + fakeMetar );
+ update_metar_properties( m );
+ update_env_config();
+ fgSetString("/environment/metar/last-metar", m->getData());
+ // TODO:desactivate real metar updates
+ if( scenario == "Fair weather" ) {
+ fgSetString("/environment/clouds/layer[1]/coverage", "cirrus");
+ }
+}
+
+
+void FGClouds::build(void) {
+ string scenario = fgGetString("/environment/weather-scenario", "METAR");
+
+ if( scenario == "METAR" ) {
+ string realMetar = fgGetString("/environment/metar/last-metar", "");
+ if( realMetar != "" ) {
+ FGMetar *m = new FGMetar( realMetar );
+ update_metar_properties( m );
+ update_env_config();
+ }
+ buildMETAR();
+ }
+ else
+ buildScenario( scenario );
+
+ // ...
+ if( snd_lightning == NULL )
+ init();
+}
projects / flightgear.git / commitdiff