/// <summary>
/// Returns the path progress from specified time progress which interpolates between start and end time.
/// </summary>
public static float GetProgress(this IHasCurve context, float progress)
{
float p = progress * context.SpanCount() % 1;
// If is a repeat and is reversing back, invert progress towards end to start.
if(context.GetSpan(progress) % 2 == 1)
return 1 - p;
return p;
}
/// <summary>
/// Computes the progress along the curve relative to how much of the <see cref="HitObject"/> has been completed.
/// </summary>
/// <param name="obj">The curve.</param>
/// <param name="progress">[0, 1] where 0 is the start time of the <see cref="HitObject"/> and 1 is the end time of the <see cref="HitObject"/>.</param>
/// <returns>[0, 1] where 0 is the beginning of the curve and 1 is the end of the curve.</returns>
public static double ProgressAt(this IHasCurve obj, double progress)
{
var p = progress * obj.SpanCount() % 1;
if (obj.SpanAt(progress) % 2 == 1)
{
p = 1 - p;
}
return(p);
}
/// <summary> /// Determines which span of the curve the progress point is on. /// </summary> /// <param name="obj">The curve.</param> /// <param name="progress">[0, 1] where 0 is the beginning of the curve and 1 is the end of the curve.</param> /// <returns>[0, SpanCount) where 0 is the first run.</returns> public static int SpanAt(this IHasCurve obj, double progress) => (int)(progress * obj.SpanCount());
/// <summary>
/// Returns the path span index at specified path progress.
/// </summary>
public static int GetSpan(this IHasCurve context, float progress)
{
return (int)(progress * context.SpanCount());
}
