Android Open Source - dice-probabilities Crit Distribution

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License

The source code is released under:

MIT License

Java Source Code

package org.kleemann.diceprobabilities.distribution;
/* w w  w.j ava  2  s .c o  m*/
import org.apache.commons.math3.fraction.BigFraction;

/**
 * <p>
 * A distribution that is similar to DieDistribution except that the highest
 * value of the die receives a bonus. Note: this makes CritDistribution not a
 * DieDistribution since DieDistributions are equal probabilities between 1 and
 * n.
 * 
 * <p>
 * e.g. a d6 is {1,2,3,4,5,6} but a crit +1 d6 is {1,2,3,4,5,7}
 */
public class CritDistribution extends AbstractDistribution {

  // the total number of sides of the die
  private final int sides;

  private final int bonus;
  
  // the equal probability of getting any side of the die
  // cache this for efficiency
  private final BigFraction probability;

  public CritDistribution(int sides, int bonus) {
    assert (sides > 0);
    this.sides = sides;
    this.bonus = bonus;
    this.probability = new BigFraction(1, sides);
  }

  @Override
  public int lowerBound() {
    return 1;
  }

  @Override
  public int upperBound() {
    return sides + 1 + bonus;
  }

  @Override
  public BigFraction getProbability(int x) {
    if ((x >= 1 && x < sides) || x == sides + bonus) {
      return probability;
    } else {
      return BigFraction.ZERO;
    }
  }
}

Java Source Code List

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