// retrieves a from->to lerp between difficulty curves
private bool GetDifficultyPropertyAtPosition(float p, out DifficultyProperties from, out DifficultyProperties to, out float alpha)
{
DifficultyProperties lowerBound = new DifficultyProperties();
DifficultyProperties upperBound = new DifficultyProperties();
bool hasLowerBound = false, hasUpperBound = false;
foreach (DifficultyProperties prop in Difficulties)
{
float time = prop.TimePosition;
// this is prior to this current time
if (time <= p)
{
// we already have a better lower bound
if (hasLowerBound && lowerBound.TimePosition > time)
{
continue;
}
lowerBound = prop;
hasLowerBound = true;
}
// this is the target difficulty
else
{
if (hasUpperBound && upperBound.TimePosition < time)
{
continue;
}
upperBound = prop;
hasUpperBound = true;
}
}
from = lowerBound;
to = lowerBound;
alpha = 0.0f;
// we need a lower bound, if none, abort
if (!hasLowerBound)
{
return(false);
}
// if no upper bound, we are beyond the last point. Use lower bound.
// Same behaviour if no fade
if (!hasUpperBound || !FadeBetweenDifficulties)
{
return(true);
}
alpha = (p - lowerBound.TimePosition) / (upperBound.TimePosition - lowerBound.TimePosition);
to = upperBound;
return(true);
}
// adds a 0.0f key as one is needed
private void ParseDifficultyProperties()
{
bool HasStartKey = false;
foreach (DifficultyProperties prop in Difficulties)
{
if (prop.TimePosition == 0.0f)
{
HasStartKey = true;
break;
}
}
if (!HasStartKey)
{
DifficultyProperties dp = new DifficultyProperties();
dp.MoleSpeed = 1.0f;
dp.MoleStayTime = 1.0f;
dp.TimePosition = 0.0f;
Difficulties.Add(dp);
}
}
