// Calculates the infection chance for a given integrated exposure.
public static float GetInfectionChance(GermExposure ge, int total, float resistance)
{
/*
* Allow one exposure count with 0 effects, then use exponential function:
*
* Chance to infect = 1.0 - e^(FACTOR * -(totalOverThreshold / threshold))
*
* With factor at 0.5:
* Double exposure count ~ 40 %
* Triple exposure count ~ 63 %
* Quadruple exposure count ~ 77 %
*
* Resistance adjusts the thresholds
*/
int threshold = GermExposureTuning.ThresholdsFor(ge.Exposure).GetThreshold(ge.
Vector);
float adjThres = AdjustedThreshold(threshold, resistance), overTotal = Mathf.Floor(
total - adjThres);
// threshold of 1 is instant infection
return((overTotal > 0.0f) ? ((threshold < 2) ? 1.0f : (1.0f - Mathf.Exp(
-GermExposureTuning.CONTRACT_FACTOR * overTotal / adjThres))) : 0.0f);
}
// Retrieves the worst chance for germ infection across all vectors.
internal float GetWorstInfectionChance(ExposureType exposure, float resist)
{
float worstChance = 0.0f;
if (exposure == null)
{
throw new ArgumentNullException("exposure");
}
foreach (var vector in ALL_VECTORS)
{
var ge = new GermExposure(vector, exposure);
if (integratedExposure.TryGetValue(ge, out int byVector))
{
// Resistance should be calculated by the SMI
float chance = GetInfectionChance(ge, byVector, resist);
if (chance > worstChance)
{
worstChance = chance;
}
}
}
return(worstChance);
}
// Performs the dirty work of counting germs on a Duplicant.
private void DoInjectDisease(GermExposureMonitor.Instance monitor, Disease disease,
int count, Tag source, GermExposure ge)
{
var exposure = ge.Exposure;
int threshold = GermExposureTuning.ThresholdsFor(exposure).GetThreshold(ge.Vector);
if (threshold > 0 && gameObject != null)
{
string germ = ge.GermID;
var state = monitor.GetExposureState(germ);
// Eligible addition to the integrated exposure calculations
if (integratedExposure.TryGetValue(ge, out int total))
{
total += count;
}
else
{
total = count;
}
#if DEBUG
PUtil.LogDebug("{0} has {1:D} germs of {2} by {3} (threshold = {4:D})".F(
gameObject.name, count, germ, ge.Vector, threshold));
#endif
integratedExposure[ge] = total;
// Resistance is required to move the thresholds which is used for tier
// calculation
float resist = GetResistance(exposure), adjThres = AdjustedThreshold(
threshold, resist), tier = total / adjThres;
switch (state)
{
case ExposureState.None:
case ExposureState.Contact:
// Update location where they encountered the germ
monitor.lastDiseaseSources[disease.id] = new DiseaseSourceInfo(source,
ge.Vector, GetInfectionChance(ge, total, resist), transform.
GetPosition());
if (total > adjThres)
{
if (exposure.infect_immediately)
{
// The ultimate evil flag
#if DEBUG
PUtil.LogDebug("Infecting {0} with {1}".F(gameObject.name, germ));
#endif
monitor.InfectImmediately(exposure);
}
else
{
// "Exposed to slimelung"
monitor.SetExposureState(germ, ExposureState.Exposed);
monitor.SetExposureTier(germ, tier);
#if DEBUG
PUtil.LogDebug("{0} exposed to {1} tier {2:F1}".F(gameObject.name,
germ, tier));
#endif
}
}
else if (state == ExposureState.None)
{
// "Contact with slimelung"
monitor.SetExposureState(germ, ExposureState.Contact);
}
break;
case ExposureState.Exposed:
// Upgrade the visual tier
if (total > threshold && tier > monitor.GetExposureTier(germ))
{
monitor.SetExposureTier(germ, tier);
#if DEBUG
PUtil.LogDebug("{0} exposure of {1} upgraded to {2:F1}".F(gameObject.
name, germ, tier));
#endif
}
break;
case ExposureState.Contracted:
case ExposureState.Sick:
// Already sick
break;
default:
break;
}
}
}