Method spawnWeatherParticles

source/game/StarWeather.cpp:326–362

}

void ClientWeather::spawnWeatherParticles(RectF newClientRegion, float dt) {
  if (!m_currentWeatherType)
    return;

  for (auto const& particleConfig : m_currentWeatherType->particles) {
    // Move client region to same wrap region as newClientRegion
    RectF visibleRegion(m_worldGeometry.nearestTo(newClientRegion.min(), m_lastParticleVisibleRegion.min()),
        m_worldGeometry.nearestTo(newClientRegion.min(), m_lastParticleVisibleRegion.max()));

    Vec2F targetVelocity = particleConfig.particle.velocity + Vec2F(wind(), 0);
    float angleChange = Vec2F::angleBetween2(Vec2F(0, 1), targetVelocity);
    visibleRegion.translate(targetVelocity * dt);

    for (auto const& renderZone : newClientRegion.subtract(visibleRegion)) {
      float count = particleConfig.density * renderZone.width() * renderZone.height() * m_currentWeatherIntensity;
      if (Random::randf() > fpart(count))
        count = std::floor(count);
      else
        count = std::ceil(count);

      for (int i = 0; i < count; ++i) {
        auto newParticle = particleConfig.particle;
        float x = Random::randf() * renderZone.width() + renderZone.xMin();
        float y = Random::randf() * renderZone.height() + renderZone.yMin();
        newParticle.position += m_worldGeometry.xwrap(Vec2F(x, y));
        newParticle.velocity = targetVelocity;
        if (y > m_undergroundLevel && (!m_weatherEffectsActiveQuery || m_weatherEffectsActiveQuery(Vec2I::floor(newParticle.position)))) {
          if (particleConfig.autoRotate)
            newParticle.rotation += angleChange;
          m_particles.append(std::move(newParticle));
        }
      }
    }
  }

  m_lastParticleVisibleRegion = newClientRegion;
}

}