praktikum-holons/src/holeg/utility/math/Maths.java

package holeg.utility.math;

public class Maths {

  public final static double EPSILON = 1E-6;

  /**
   * Linear Interpolation from first to second via alpha amount.
   *
   * @param first
   * @param second
   * @param alpha
   * @return
   */
  public static double lerp(double first, double second, double alpha) {
    return first * (1.0 - alpha) + second * alpha;
  }

  /**
   * Inverse Linear Interpolation from min to max to get the corresponding alpha from value.
   *
   * @param min
   * @param max
   * @param value
   * @return
   */
  public static double invLerp(double min, double max, double value) {
    if (Math.abs(max - min) < EPSILON) {
      return max;
    } else {
      return (value - min) / (max - min);
    }
  }

  public static int Clamp(int value, int min, int max) {
    return Math.max(min, Math.min(max, value));
  }

  public static float Clamp(float value, float min, float max) {
    return Math.max(min, Math.min(max, value));
  }

  public static double Clamp(double value, double min, double max) {
    return Math.max(min, Math.min(max, value));
  }
}