Package net.paulhertz.pixelaudio.curves

Class PAIndexParametric

java.lang.Object
net.paulhertz.pixelaudio.curves.PAIndexParametric
All Implemented Interfaces:
PAControlCurve
public final class PAIndexParametric extends Object implements PAControlCurve
PAIndexParametric Parametric view of an indexed offset list, typically into a float[] buffer (for example, an audio signal or lookup table). u ∈ [0,1] -> f(u) For now, u is interpreted over the index domain of the offset list: - u = 0 -> first offset - u = 1 -> last offset - intermediate u -> linear interpolation between neighboring offsets This class now implements PAControlCurve so it can be used anywhere a normalized scalar control curve is needed.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private final int
    count
     
    private final int[]
    offsets
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    PAIndexParametric(int[] offsets)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    private static float
    clamp01(float u)
     
    int[]
    getOffsets()
     
    int
    getPointCount()
     
    private static float
    lerp(int a, int b, float u)
     
    float
    sample(float u)
    Sample the curve at parameter u ∈ [0,1], returning the interpolated scalar value as a float.
    int
    sampleIndex(float u)
    Alias for sampleInt(u), preserving the old public API shape if desired.
    int
    sampleInt(float u)
    Sample the curve at parameter u ∈ [0,1], returning the interpolated scalar value rounded to the nearest int.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • offsets

      private final int[] offsets

    • count

      private final int count

  • Constructor Details

    • PAIndexParametric

      public PAIndexParametric(int[] offsets)
      Parameters:
      offsets - ordered offsets in a buffer; must contain at least 2 offsets

  • Method Details

    • getPointCount

      public int getPointCount()
      Returns:
      number of offsets in this parametric series

    • getOffsets

      public int[] getOffsets()
      Returns:
      defensive copy of the underlying offsets

    • sample

      public float sample(float u)
      Sample the curve at parameter u ∈ [0,1], returning the interpolated scalar value as a float. u is clamped to [0,1].
      Specified by:
      sample in interface PAControlCurve

    • sampleInt

      public int sampleInt(float u)
      Sample the curve at parameter u ∈ [0,1], returning the interpolated scalar value rounded to the nearest int. Handy when offsets are ultimately used as buffer indices.

    • sampleIndex

      public int sampleIndex(float u)
      Alias for sampleInt(u), preserving the old public API shape if desired.

    • clamp01

      private static float clamp01(float u)

    • lerp

      private static float lerp(int a, int b, float u)