Method update

source/game/StarParticleManager.cpp:30–100

}

void ParticleManager::update(float dt, RectF const& cullRegion, float wind) {
  if (!m_tileSectorArray)
    return;

  auto cullRects = m_worldGeometry.splitRect(cullRegion);

  for (auto& particle : m_particles) {
    bool inRegion = false;
    Vec2F worldPos = m_worldGeometry.xwrap(particle.position);
    for (auto cullRect : cullRects) {
      if (cullRect.contains(worldPos)) {
        inRegion = true;
        break;
      }
    }
    if (!inRegion)
      continue;

    particle.update(dt, Vec2F(wind, 0));
    Vec2I pos(particle.position.floor());
    TileType tiletype;
    auto const& tile = m_tileSectorArray->tile(pos);
    if (isSolidColliding(tile.getCollision()))
      tiletype = TileType::Colliding;
    else if (tile.liquid.level > 0.5f)
      tiletype = TileType::Water;
    else
      tiletype = TileType::Empty;

    if (particle.collidesForeground && tiletype == TileType::Colliding) {
      RectF colRect;
      colRect.setXMax(std::ceil(particle.position[0]));
      colRect.setXMin(std::floor(particle.position[0]));
      colRect.setYMax(std::ceil(particle.position[1]));
      colRect.setYMin(std::floor(particle.position[1]));
      Line2F colLine(particle.position, particle.position - particle.velocity);

      auto collisionPosition = colRect.edgeIntersection(colLine).point;
      if (particle.position[0] > colRect.center()[0])
        collisionPosition[0] += 0.1f;
      else if (particle.position[0] < colRect.center()[0])
        collisionPosition[0] -= 0.1f;
      if (particle.position[1] > colRect.center()[1])
        collisionPosition[1] += 0.1f;
      else if (particle.position[1] < colRect.center()[1])
        collisionPosition[1] -= 0.1f;

      particle.collide(collisionPosition);
    }

    if (particle.underwaterOnly && tiletype == TileType::Empty)
      particle.destroy(false);

    if (particle.collidesLiquid && tiletype == TileType::Water)
      particle.destroy(false);

    if (particle.trail && particle.timeToLive >= 0.0f) {
      auto trail = particle;