00001
00027 #include "precipitation.hxx"
00028 #include "visual_enviro.hxx"
00029
00030 #include <simgear/constants.h>
00031
00037 SGPrecipitation::SGPrecipitation() :
00038 _freeze(false), _snow_intensity(0.0), _rain_intensity(0.0)
00039 {
00040 _precipitationEffect = new osgParticle::PrecipitationEffect;
00041 }
00042
00043
00050 osg::Group* SGPrecipitation::build(void)
00051 {
00052 osg::Group* group = new osg::Group;
00053
00054 _precipitationEffect->snow(0);
00055 _precipitationEffect->rain(0);
00056
00057 group->addChild(_precipitationEffect.get());
00058
00059 return group;
00060 }
00061
00062
00069 void SGPrecipitation::setSnowIntensity(float intensity)
00070 {
00071 if (this->_snow_intensity < intensity-0.001)
00072 this->_snow_intensity += 0.001;
00073 else if (this->_snow_intensity > intensity+0.001)
00074 this->_snow_intensity -= 0.001;
00075 else
00076 this->_snow_intensity = intensity;
00077 }
00078
00079
00086 void SGPrecipitation::setRainIntensity(float intensity)
00087 {
00088 if (this->_rain_intensity < intensity-0.001)
00089 this->_rain_intensity += 0.001;
00090 else if (this->_rain_intensity > intensity+0.001)
00091 this->_rain_intensity -= 0.001;
00092 else
00093 this->_rain_intensity = intensity;
00094 }
00095
00096
00104 void SGPrecipitation::setFreezing(bool freeze)
00105 {
00106 this->_freeze = freeze;
00107 }
00108
00109
00119 void SGPrecipitation::setWindProperty(double heading, double speed)
00120 {
00121 double x, y, z;
00122
00123 heading = (heading + 180) * SGD_DEGREES_TO_RADIANS;
00124 speed = speed * SG_FEET_TO_METER;
00125
00126 x = -cos(heading) * speed;
00127 y = sin(heading) * speed;
00128 z = 0;
00129
00130 this->_wind_vec = osg::Vec3(x, y, z);
00131 }
00132
00133
00143 bool SGPrecipitation::update(void)
00144 {
00145 if (this->_freeze) {
00146 if (this->_rain_intensity > 0)
00147 this->_snow_intensity = this->_rain_intensity;
00148 }
00149
00150 bool enabled = sgEnviro.get_precipitation_enable_state();
00151 if (enabled && this->_snow_intensity > 0) {
00152 _precipitationEffect->setWind(_wind_vec);
00153 _precipitationEffect->setParticleSpeed( -0.75f - 0.25f*_snow_intensity);
00154
00155 _precipitationEffect->setParticleSize(0.02f + 0.03f*_snow_intensity);
00156 _precipitationEffect->setMaximumParticleDensity(_snow_intensity * 7.2f);
00157 _precipitationEffect->setCellSize(osg::Vec3(5.0f / (0.25f+_snow_intensity), 5.0f / (0.25f+_snow_intensity), 5.0f));
00158
00159 _precipitationEffect->setNearTransition(25.f);
00160 _precipitationEffect->setFarTransition(100.0f - 60.0f*sqrtf(_snow_intensity));
00161
00162 _precipitationEffect->setParticleColor(osg::Vec4(0.85, 0.85, 0.85, 1.0) - osg::Vec4(0.1, 0.1, 0.1, 1.0) * _snow_intensity);
00163 } else if (enabled && this->_rain_intensity > 0) {
00164 _precipitationEffect->setWind(_wind_vec);
00165 _precipitationEffect->setParticleSpeed( -2.0f + -5.0f*_rain_intensity);
00166
00167 _precipitationEffect->setParticleSize(0.01 + 0.02*_rain_intensity);
00168 _precipitationEffect->setMaximumParticleDensity(_rain_intensity * 7.5f);
00169 _precipitationEffect->setCellSize(osg::Vec3(5.0f / (0.25f+_rain_intensity), 5.0f / (0.25f+_rain_intensity), 5.0f));
00170
00171 _precipitationEffect->setNearTransition(25.f);
00172 _precipitationEffect->setFarTransition(100.0f - 60.0f*sqrtf(_rain_intensity));
00173
00174 _precipitationEffect->setParticleColor( osg::Vec4(0x7A, 0xCE, 0xFF, 0x80));
00175 } else {
00176 _precipitationEffect->snow(0);
00177 _precipitationEffect->rain(0);
00178 }
00179
00180 return true;
00181 }
