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flightgear/src/Environment/fgclouds.cxx
ehofman b24dbb3f8b Alex Romosan: 
I tried to make sure accessor functions which return by reference act
on const objects. also replaced some iterators with const_iterator
and a few return/pass by reference that were missed the first time
around.
2005-10-26 09:03:49 +00:00

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// 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_ctrl.hxx"
#include "environment_mgr.hxx"
#include "fgmetar.hxx"
#include "fgclouds.hxx"
extern SGSky *thesky;
FGClouds::FGClouds(FGEnvironmentCtrl * controller) :
station_elevation_ft(0.0),
_controller( controller ),
snd_lightning(NULL),
last_scenario( "none" ),
last_env_config( new SGPropertyNode() ),
last_env_clouds( new SGPropertyNode() )
{
update_event = 0;
fgSetString("/environment/weather-scenario", last_scenario.c_str());
}
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, const 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, const 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/cloudlayers/clouds", false);
SGPropertyNode *layer_def_root = fgGetNode("/environment/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() );
const 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>::const_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, const string& coverage, const 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( const string& scenario ) {
string fakeMetar="";
string station = fgGetString("/environment/metar/station-id", "XXXX");
// fetch station elevation if exists
if( station == "XXXX" )
station_elevation_ft = fgGetDouble("/position/ground-elev-m", 0.0);
else {
const FGAirport* a = globals->get_airports()->search( station );
station_elevation_ft = (a ? a->getElevation() : 0.0);
}
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();
// propagate aloft tables
_controller->reinit();
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 == last_scenario)
return;
if( last_scenario == "none" ) {
// save clouds and weather conditions
SGPropertyNode *param = fgGetNode("/environment/config", true);
copyProperties( param, last_env_config );
param = fgGetNode("/environment/clouds", true);
copyProperties( param, last_env_clouds );
}
if( scenario == "METAR" ) {
string realMetar = fgGetString("/environment/metar/real-metar", "");
if( realMetar != "" ) {
fgSetString("/environment/metar/last-metar", realMetar.c_str());
FGMetar *m = new FGMetar( realMetar );
update_metar_properties( m );
update_env_config();
// propagate aloft tables
_controller->reinit();
}
buildMETAR();
}
else if( scenario == "none" ) {
// restore clouds and weather conditions
SGPropertyNode *param = fgGetNode("/environment/config", true);
copyProperties( last_env_config, param );
param = fgGetNode("/environment/clouds", true);
copyProperties( last_env_clouds, param );
fgSetDouble("/environment/metar/rain-norm", 0.0);
fgSetDouble("/environment/metar/snow-norm", 0.0);
// update_env_config();
// propagate aloft tables
_controller->reinit();
buildMETAR();
}
else
buildScenario( scenario );
last_scenario = scenario;
// ...
if( snd_lightning == NULL )
init();
}
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