RotatePoint.java

/* Copyright (C) 2011 Garrett Fleenor

 This library is free software; you can redistribute it and/or modify it
 under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation; either version 3.0 of the License, or (at
 your option) any later version.

 This library is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 License (COPYING.txt) for more details.

 You should have received a copy of the GNU Lesser General Public License
 along with this library; if not, write to the Free Software Foundation,
 Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 This is a port of libnoise ( http://libnoise.sourceforge.net/index.html ).  Original implementation by Jason Bevins

*/
package com.bioxx.libnoise.module.modifier;

import com.bioxx.libnoise.MathHelper;
import com.bioxx.libnoise.Utils;
import com.bioxx.libnoise.exception.NoModuleException;
import com.bioxx.libnoise.module.Module;

public class RotatePoint extends Module {

	/// Default @a x rotation angle for the noise::module::RotatePoint noise
	/// module.
	public static final double DEFAULT_ROTATE_X = 0.0;

	/// Default @a y rotation angle for the noise::module::RotatePoint noise
	/// module.
	public static final double DEFAULT_ROTATE_Y = 0.0;

	/// Default @a z rotation angle for the noise::module::RotatePoint noise
	/// module.
	public static final double DEFAULT_ROTATE_Z = 0.0;

	double xAngle = DEFAULT_ROTATE_X;
	double yAngle = DEFAULT_ROTATE_Y;
	double zAngle = DEFAULT_ROTATE_Z;

	/// An entry within the 3x3 rotation matrix used for rotating the
	/// input value.
	double x1Matrix;

	/// An entry within the 3x3 rotation matrix used for rotating the
	/// input value.
	double x2Matrix;

	/// An entry within the 3x3 rotation matrix used for rotating the
	/// input value.
	double x3Matrix;

	/// An entry within the 3x3 rotation matrix used for rotating the
	/// input value.
	double y1Matrix;

	/// An entry within the 3x3 rotation matrix used for rotating the
	/// input value.
	double y2Matrix;

	/// An entry within the 3x3 rotation matrix used for rotating the
	/// input value.
	double y3Matrix;

	/// An entry within the 3x3 rotation matrix used for rotating the
	/// input value.
	double z1Matrix;

	/// An entry within the 3x3 rotation matrix used for rotating the
	/// input value.
	double z2Matrix;

	/// An entry within the 3x3 rotation matrix used for rotating the
	/// input value.
	double z3Matrix;

	public RotatePoint() {
		super(1);
		setAngles(DEFAULT_ROTATE_X, DEFAULT_ROTATE_Y, DEFAULT_ROTATE_Z);
	}

	public void setAngles(double x, double y, double z) {
		double xCos, yCos, zCos, xSin, ySin, zSin;
		xCos = MathHelper.cos(x * Utils.DEG_TO_RAD);
		yCos = MathHelper.cos(y * Utils.DEG_TO_RAD);
		zCos = MathHelper.cos(z * Utils.DEG_TO_RAD);
		xSin = MathHelper.sin(x * Utils.DEG_TO_RAD);
		ySin = MathHelper.sin(y * Utils.DEG_TO_RAD);
		zSin = MathHelper.sin(z * Utils.DEG_TO_RAD);

		x1Matrix = ySin * xSin * zSin + yCos * zCos;
		y1Matrix = xCos * zSin;
		z1Matrix = ySin * zCos - yCos * xSin * zSin;
		x2Matrix = ySin * xSin * zCos - yCos * zSin;
		y2Matrix = xCos * zCos;
		z2Matrix = -yCos * xSin * zCos - ySin * zSin;
		x3Matrix = -ySin * xCos;
		y3Matrix = xSin;
		z3Matrix = yCos * xCos;

		this.xAngle = x;
		this.yAngle = y;
		this.zAngle = z;

	}

	public double getxAngle() {
		return xAngle;
	}

	public void setxAngle(double xAngle) {
		setAngles(xAngle, yAngle, zAngle);
	}

	public double getyAngle() {
		return yAngle;
	}

	public void setyAngle(double yAngle) {
		setAngles(xAngle, yAngle, zAngle);
	}

	public double getzAngle() {
		return zAngle;
	}

	public void setzAngle(double zAngle) {
		setAngles(xAngle, yAngle, zAngle);
	}

	@Override
	public int GetSourceModuleCount() {
		return 1;
	}

	@Override
	public double GetValue(double x, double y, double z) {
		if (SourceModule[0] == null)
			throw new NoModuleException();

		double nx = (x1Matrix * x) + (y1Matrix * y) + (z1Matrix * z);
		double ny = (x2Matrix * x) + (y2Matrix * y) + (z2Matrix * z);
		double nz = (x3Matrix * x) + (y3Matrix * y) + (z3Matrix * z);
		return SourceModule[0].GetValue(nx, ny, nz);

	}

}