Class ExponentialDecayInterpolator

java.lang.Object
com.softsynth.jmsl.util.ExponentialDecayInterpolator
All Implemented Interfaces:
Interpolator

public class ExponentialDecayInterpolator
extends java.lang.Object
implements Interpolator
Interpolate a value along an exponentially decreasing curve defined by two points (x1,y1) and (x2,y2) where x1 < x2, y1 > y2.
The shape of f(x) = 1/exp(x) on the interval [0..steepness] is fitted to the user's endpoints.
That is, (x1,y1) corresponds to (0, 1) and (x2,y2) corresponds to (1,e^steepness), and this new curve resembles a stretched or compressed version of the 1/exp(x) function.
  • Constructor Summary

    Constructors
    Constructor Description
    ExponentialDecayInterpolator​(double x1, double y1, double x2, double y2)
    Construct an interpolator that fits a curve between (x1, y1) and (x2, y2) to an exponentially decaying function.
  • Method Summary

    Modifier and Type Method Description
    double interp​(double x)
    Interpolate a value along exponential curve
    void setInterp​(double x1, double y1, double x2, double y2)
    Set two endpoints points on the desired curve, to be shaped as f(x)=1/exp(x) on (0,1)..(32,)
    so (x1, y1) corresponds to (0,1) which is (0, 1/e^0) and (x2, y2) basically corresponds to at what point do you want x to give a value close to 0.
    void setSteepness​(double s)  

    Methods inherited from class java.lang.Object

    equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  • Constructor Details

    • ExponentialDecayInterpolator

      public ExponentialDecayInterpolator​(double x1, double y1, double x2, double y2)
      Construct an interpolator that fits a curve between (x1, y1) and (x2, y2) to an exponentially decaying function.
  • Method Details

    • setInterp

      public void setInterp​(double x1, double y1, double x2, double y2)
      Set two endpoints points on the desired curve, to be shaped as f(x)=1/exp(x) on (0,1)..(32,)
      so (x1, y1) corresponds to (0,1) which is (0, 1/e^0) and (x2, y2) basically corresponds to at what point do you want x to give a value close to 0. For now, y2 itself is ignored. precondition: x1y2
      Specified by:
      setInterp in interface Interpolator
    • interp

      public double interp​(double x)
      Interpolate a value along exponential curve
      Specified by:
      interp in interface Interpolator
    • setSteepness

      public void setSteepness​(double s)