RobertSzkutak

#!/usr/bin/env python3

# ircecho.py
# Copyright (C) 2011 : Robert L Szkutak II - http://robertszkutak.com
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#

begla

public static float lerp(float x, float x1, float x2, float q00, float q01) {
  return ((x2 - x) / (x2 - x1)) * q00 + ((x - x1) / (x2 - x1)) * q01;
}

public static float biLerp(float x, float y, float q11, float q12, float q21, float q22, float x1, float x2, float y1, float y2) {
  float r1 = lerp(x, x1, x2, q11, q21);
  float r2 = lerp(x, x1, x2, q12, q22);

  return lerp(y, y1, y2, r1, r2);
}

banksean

// Ported from Stefan Gustavson's java implementation
// http://staffwww.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf
// Read Stefan's excellent paper for details on how this code works.
//
// Sean McCullough banksean@gmail.com

/**
 * You can pass in a random number generator object if you like.
 * It is assumed to have a random() method.
 */