/// <summary>
/// Returns the time until the next asteroid should be detected. Does not throw exceptions.
/// </summary>
/// <returns>The number of seconds before an asteroid detection, or infinity if asteroids
/// should not spawn.</returns>
private static double asteroidWaitTime()
{
double rate = AsteroidManager.spawnRate(); // asteroids per day
if (rate > 0.0)
{
// Waiting time in a Poisson process follows an exponential distribution
rate /= SECONDS_PER_EARTH_DAY; // asteroids per second
return(RandomDist.drawExponential(1.0 / rate));
}
else
{
return(double.PositiveInfinity);
}
}
/// <summary>
/// Uses criteria similar to ScenarioDiscoverableObjects to decide whether to create an
/// asteroid.
/// </summary>
protected override void checkSpawn()
{
if (areAsteroidsTrackable() &&
AsteroidManager.spawnRate() > 0.0 &&
countUntrackedAsteroids() < rng.Next(SPAWN_GROUP_MIN_LIMIT, SPAWN_GROUP_MAX_LIMIT))
{
if (rng.NextDouble() < 1.0 / (1.0 + SPAWN_ODDS_AGAINST))
{
spawnAsteroid();
}
else
{
Debug.Log("[StockalikeSpawner]: "
+ Localizer.Format("#autoLOC_CustomAsteroids_LogSpawnStock",
SPAWN_ODDS_AGAINST));
}
}
}
/// <summary>
/// Returns the probability of detecting an asteroid in one tick. Does not throw exceptions.
/// </summary>
/// <param name="tickLength">The number of seconds in the current tick.</param>
/// <returns>The asteroid discovery probability, scaled for the current time warp.</returns>
private static float asteroidChance(double tickLength)
{
if (tickLength <= 0.0)
{
return(0.0f);
}
double rate = AsteroidManager.spawnRate() / SECONDS_PER_EARTH_DAY; // asteroids per second
if (rate > 0.0)
{
float expected = (float)(rate * tickLength);
return(Mathf.Max(0.0f, Mathf.Min(1.0f - Mathf.Exp(-expected), 1.0f)));
}
else
{
return(0.0f); // Avoid small nonzero probability if rate == 0.0
}
}
