v2.4.0: fixed and slightly expanded functionality in Random

SPD-classes/src/main/java/com/watabou/utils/Random.java

@@ -93,6 +93,11 @@ public class Random {
 		return min + ((Float(max - min) + Float(max - min))/2f);
 	}
 
+	//returns a uniformly distributed int in the range [-2^31, 2^31)
+	public static synchronized int Int() {
+		return generators.peek().nextInt();
+	}
+
 	//returns a uniformly distributed int in the range [0, max)
 	public static synchronized int Int( int max ) {
 		return max > 0 ? generators.peek().nextInt(max) : 0;
@@ -109,20 +114,30 @@ public class Random {
 	}
 
 	//returns a triangularly distributed int in the range [min, max]
+	//this makes results more likely as they get closer to the middle of the range
 	public static int NormalIntRange( int min, int max ) {
 		return min + (int)((Float() + Float()) * (max - min + 1) / 2f);
 	}
 
+	//returns an inverse triangularly distributed int in the range [min, max]
+	//this makes results more likely as they get further from the middle of the range
+	public static int InvNormalIntRange( int min, int max){
+		float roll1 = Float(), roll2 = Float();
+		if (Math.abs(roll1-0.5f) >= Math.abs(roll2-0.5f)){
+			return min + (int)(roll1*(max - min + 1));
+		} else {
+			return min + (int)(roll2*(max - min + 1));
+		}
+	}
+
 	//returns a uniformly distributed long in the range [-2^63, 2^63)
 	public static synchronized long Long() {
 		return generators.peek().nextLong();
 	}
 
 	//returns a uniformly distributed long in the range [0, max)
-	public static long Long( long max ) {
-		long result = Long();
-		if (result < 0) result += Long.MAX_VALUE;
-		return result % max;
+	public static synchronized long Long( long max ) {
+		return max > 0 ? generators.peek().nextLong(max) : 0;
 	}
 
 	//returns an index from chances, the probability of each index is the weight values in changes