NoiseGen.java

/* 
 * Copyright (c) CovertJaguar, 2014 http://railcraft.info
 * 
 * This code is the property of CovertJaguar
 * and may only be used with explicit written
 * permission unless otherwise specified on the
 * license page at http://railcraft.info/wiki/info:license.
 */
package mods.railcraft.common.worldgen;

import java.util.Random;

/**
 *
 * @author CovertJaguar <http://www.railcraft.info/>
 */
public abstract class NoiseGen {

    public static final int OFFSET_RANGE = 50000;
    protected final int xOffset, zOffset;
    protected final double scale;

    public NoiseGen(Random rand, double scale) {
        this.scale = scale;
        xOffset = rand.nextInt(OFFSET_RANGE) - (OFFSET_RANGE / 2);
        zOffset = rand.nextInt(OFFSET_RANGE) - (OFFSET_RANGE / 2);
    }

    public abstract double noise(double x, double z);

    public boolean isLessThan(double x, double z, double level) {
        return noise(x, z) < level;
    }

    public boolean isGreaterThan(double x, double z, double level) {
        return noise(x, z) > level;
    }

    public static class NoiseGenSimplex extends NoiseGen {

        public NoiseGenSimplex(Random rand, double scale) {
            super(rand, scale);
        }

        @Override
        public double noise(double x, double z) {
            return SimplexNoise.noise((x + xOffset) * scale, (z + zOffset) * scale);
        }

    }

}