/*
* Copyright (C) 2013 Parallel Universe Software Co.
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package co.paralleluniverse.spaceships;
import co.paralleluniverse.spacebase.AABB;
import co.paralleluniverse.spacebase.MutableAABB;
import static java.lang.Math.*;
import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;
/**
*
* @author pron
*/
public class RandSpatial {
// private final Random random;
//
// public RandSpatial(long seed) {
// random = new Random(seed);
// }
//
// public RandSpatial() {
// random = ThreadLocalRandom.current();
// }
public Random getRandom() {
return ThreadLocalRandom.current();
}
private MutableAABB floatify(MutableAABB aabb) {
for (int d = 0; d < aabb.dims(); d++) {
aabb.min(d, (float) aabb.min(d));
aabb.max(d, (float) aabb.max(d));
}
return aabb;
}
public AABB randomAABB(AABB bounds) {
MutableAABB aabb = AABB.create(bounds.dims());
for (int i = 0; i < bounds.dims(); i++) {
double a = randRange(bounds.min(i), bounds.max(i));
double b = randRange(bounds.min(i), bounds.max(i));
aabb.min(i, (float) min(a, b));
aabb.max(i, (float) max(a, b));
}
return floatify(aabb);
}
public AABB randomAABB(AABB bounds, double expSize, double variance) {
MutableAABB aabb = AABB.create(bounds.dims());
for (int i = 0; i < bounds.dims(); i++) {
double tmp = getRandom().nextGaussian();
double size = (tmp*tmp) * variance + expSize;
if(expSize > 0 && size == 0)
size = 0.01;
double a = randRange(bounds.min(i), bounds.max(i) - size);
aabb.min(i, (float) a);
aabb.max(i, (float) (a + size));
}
return floatify(aabb);
}
public AABB randomPoint(AABB bounds) {
return randomAABB(bounds, 0, 0);
}
public double randRange(double min, double max) {
double r = getRandom().nextDouble();
return (float)(r * (max - min) + min);
}
public synchronized void setSeed(long seed) {
getRandom().setSeed(seed);
}
public long nextLong() {
return getRandom().nextLong();
}
public int nextInt(int n) {
return getRandom().nextInt(n);
}
public int nextInt() {
return getRandom().nextInt();
}
public synchronized double nextGaussian() {
return getRandom().nextGaussian();
}
public float nextFloat() {
return getRandom().nextFloat();
}
public double nextDouble() {
return getRandom().nextDouble();
}
public void nextBytes(byte[] bytes) {
getRandom().nextBytes(bytes);
}
public boolean nextBoolean() {
return getRandom().nextBoolean();
}
}