com.torvald → net.torvald

Former-commit-id: 375604da8a20a6ba7cd0a8d05a44add02b2d04f4
Former-commit-id: 287287c5920b07618174d7a7573f049d350ded66

src/net/torvald/random/FudgeDice.kt

@@ -0,0 +1,47 @@
+package net.torvald.random
+
+import java.util.Random
+
+/**
+ * Created by minjaesong on 16-02-03.
+ */
+open class FudgeDice
+/**
+ * Define new set of fudge dice with given counts.
+ * @param randfunc java.util.Random or its extension
+ * *
+ * @param counts amount of die
+ */
+(private val randfunc: Random, val diceCounts: Int) {
+
+    /**
+     * Roll dice and get result.
+     * @return Normal distributed integer [-N , N] for diceCount of N. 0 is the most frequent return.
+     */
+    fun roll(): Int {
+        var diceResult = 0
+        for (c in 0..diceCounts - 1) {
+            diceResult += rollSingleDie()
+        }
+
+        return diceResult
+    }
+
+    /**
+     * Roll dice and get result, for array index
+     * @return Normal distributed integer [0 , N] for N = 2 × DiceCounts + 1. 0 is the most frequent return.
+     */
+    fun rollForArray(): Int {
+        return roll() + diceCounts
+    }
+
+    val sizeOfProbabilityRange: Int
+        get() = 2 * diceCounts + 1
+
+    /**
+     * @return integer randomly picked from {-1, 0, 1}
+     */
+    private fun rollSingleDie(): Int {
+        return randfunc.nextInt(3) - 1
+    }
+}