PredefinedRandom fails when generating integers due to overflow

[mitkonikov]

PredefinedRandom's nextInt() function is overflowing. Running this simple test:

RNG.setSelectedRandomGenerator(RngType.PREDEFINED_RANDOM);
for (int i = 0; i < 20; i++) {
    System.out.println(RNG.nextInt());
}

One can see that it will generate -1 many times and only negative numbers. This is indicative of overflow.

The nextInt() function should be fixed as follows:

@Override
public int nextInt() {
    double normalized = (getNextPredefinedNumber() % 1.0);
    return (int)(Integer.MIN_VALUE + (long)(normalized * ((long)Integer.MAX_VALUE - Integer.MIN_VALUE)));
}

The (normalized * range) should be kept long instead of int due to its size.

I will push a pull request for a new algorithm soon and push this change as well. Tell me if you want a separate PR for this change.

PS: I'm also currently working on improving the Point class and a few other things.