/// <summary>
/// Converts an unbounded time to a time within the curve's interval using the
/// endpoint behavior.
/// </summary>
/// <param name="time">Time to convert.</param>
/// <param name="intervalBegin">Beginning of the curve's interval.</param>
/// <param name="intervalEnd">End of the curve's interval.</param>
/// <param name="preLoop">Looping behavior of the curve before the first endpoint's time.</param>
/// <param name="postLoop">Looping behavior of the curve after the last endpoint's time.</param>
/// <returns>Time within the curve's interval.</returns>
public static double ModifyTime(double time, double intervalBegin, double intervalEnd,
CurveEndpointBehavior preLoop, CurveEndpointBehavior postLoop)
{
if (time < intervalBegin)
{
switch (preLoop)
{
case CurveEndpointBehavior.Wrap:
double modifiedTime = time - intervalBegin;
double intervalLength = intervalEnd - intervalBegin;
modifiedTime %= intervalLength;
return(intervalEnd + modifiedTime);
case CurveEndpointBehavior.Clamp:
return(Math.Max(intervalBegin, time));
case CurveEndpointBehavior.Mirror:
modifiedTime = time - intervalBegin;
intervalLength = intervalEnd - intervalBegin;
int numFlips = (int)(modifiedTime / intervalLength);
if (numFlips % 2 == 0)
{
return(intervalBegin - modifiedTime % intervalLength);
}
return(intervalEnd + modifiedTime % intervalLength);
}
}
else if (time >= intervalEnd)
{
switch (postLoop)
{
case CurveEndpointBehavior.Wrap:
double modifiedTime = time - intervalEnd;
double intervalLength = intervalEnd - intervalBegin;
modifiedTime %= intervalLength;
return(intervalBegin + modifiedTime);
case CurveEndpointBehavior.Clamp:
return(Math.Min(intervalEnd, time));
case CurveEndpointBehavior.Mirror:
modifiedTime = time - intervalEnd;
intervalLength = intervalEnd - intervalBegin;
int numFlips = (int)(modifiedTime / intervalLength);
if (numFlips % 2 == 0)
{
return(intervalEnd - modifiedTime % intervalLength);
}
return(intervalBegin + modifiedTime % intervalLength);
}
}
return(time);
}
/// <summary>
/// Converts an unbounded time to a time within the curve's interval using the
/// endpoint behavior.
/// </summary>
/// <param name="time">Time to convert.</param>
/// <param name="intervalBegin">Beginning of the curve's interval.</param>
/// <param name="intervalEnd">End of the curve's interval.</param>
/// <param name="preLoop">Looping behavior of the curve before the first endpoint's time.</param>
/// <param name="postLoop">Looping behavior of the curve after the last endpoint's time.</param>
/// <returns>Time within the curve's interval.</returns>
public static Fix64 ModifyTime(Fix64 time, Fix64 intervalBegin, Fix64 intervalEnd, CurveEndpointBehavior preLoop, CurveEndpointBehavior postLoop)
{
if (time < intervalBegin)
{
switch (preLoop)
{
case CurveEndpointBehavior.Wrap:
Fix64 modifiedTime = time - intervalBegin;
Fix64 intervalLength = intervalEnd - intervalBegin;
modifiedTime %= intervalLength;
return(intervalEnd + modifiedTime);
case CurveEndpointBehavior.Clamp:
return(MathHelper.Max(intervalBegin, time));
case CurveEndpointBehavior.Mirror:
modifiedTime = time - intervalBegin;
intervalLength = intervalEnd - intervalBegin;
var numFlips = (int)(modifiedTime / intervalLength);
if (numFlips % 2 == 0)
{
return(intervalBegin - modifiedTime % intervalLength);
}
return(intervalEnd + modifiedTime % intervalLength);
}
}
else if (time >= intervalEnd)
{
switch (postLoop)
{
case CurveEndpointBehavior.Wrap:
Fix64 modifiedTime = time - intervalEnd;
Fix64 intervalLength = intervalEnd - intervalBegin;
modifiedTime %= intervalLength;
return(intervalBegin + modifiedTime);
case CurveEndpointBehavior.Clamp:
return(MathHelper.Min(intervalEnd, time));
case CurveEndpointBehavior.Mirror:
modifiedTime = time - intervalEnd;
intervalLength = intervalEnd - intervalBegin;
var numFlips = (int)(modifiedTime / intervalLength);
if (numFlips % 2 == 0)
{
return(intervalEnd - modifiedTime % intervalLength);
}
return(intervalBegin + modifiedTime % intervalLength);
}
}
return(time);
}
