private float GetValue(SetRampValueEvent x, float elapsedTime)
{
// Number of slices to break up the duration.
const float slices = 10;
float endValue = x.InitialSlope * x.Duration * slices + x.InitialValue;
// FIXME: Incorporate 2nd derivative into the interpolated pitch.
float amount = MathHelper.Clamp(
(elapsedTime - Timestamp / 1000.0f) / x.Duration,
0.0f,
1.0f
);
return(MathHelper.Lerp(x.InitialValue, endValue, amount));
}
public override void Apply(Cue cue, XACTClip track, float elapsedTime)
{
SetRampValueEvent evt = (SetRampValueEvent)Event;
if (elapsedTime <= Timestamp / 1000.0f + evt.Duration)
{
switch (evt.Property)
{
case CueProperty.Volume:
cue.eventVolume = GetValue(evt, elapsedTime);
break;
case CueProperty.Pitch:
cue.eventPitch = GetValue(evt, elapsedTime);
break;
}
}
else
{
HandleRepeating();
}
}
public SetRampValueEventInstance(SetRampValueEvent evt)
: base(evt)
{
}