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/*
* Copyright (C) 2003, 2004 Jason Bevins (original libnoise code)
* Copyright 2010 Thomas J. Hodge (java port of libnoise)
*
* This file is part of libnoiseforjava.
*
* libnoiseforjava is a Java port of the C++ library libnoise, which may be found at
* http://libnoise.sourceforge.net/. libnoise was developed by Jason Bevins, who may be
* contacted at jlbezigvins@gmzigail.com (for great email, take off every 'zig').
* Porting to Java was done by Thomas Hodge, who may be contacted at
* libnoisezagforjava@gzagmail.com (remove every 'zag').
*
* libnoiseforjava is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* libnoiseforjava 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* libnoiseforjava. If not, see <http://www.gnu.org/licenses/>.
*
*/
package libnoiseforjava.module;
import libnoiseforjava.exception.ExceptionInvalidParam;
public class RotatePoint extends ModuleBase
{
/// Noise module that rotates the input value around the origin before
/// returning the output value from a source module.
///
/// The getValue() method rotates the coordinates of the input value
/// around the origin before returning the output value from the source
/// module. To set the rotation angles, call the setAngles() method. To
/// set the rotation angle around the individual @a x, @a y, or @a z axes,
/// call the setXAngle(), setYAngle() or setZAngle() methods,
/// respectively.
///
/// The coordinate system of the input value is assumed to be
/// "left-handed" (@a x increases to the right, @a y increases upward,
/// and @a z increases inward.)
///
/// This noise module requires one source module.
/// Default @a x rotation angle for the RotatePoint noise
/// module.
static final double DEFAULT_ROTATE_X = 0.0;
/// Default @a y rotation angle for the RotatePoint noise
/// module.
static final double DEFAULT_ROTATE_Y = 0.0;
/// Default @a z rotation angle for the RotatePoint noise
/// module.
static final double DEFAULT_ROTATE_Z = 0.0;
/// 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;
/// @a x rotation angle applied to the input value, in degrees.
double xAngle;
/// 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;
/// @a y rotation angle applied to the input value, in degrees.
double yAngle;
/// 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;
/// @a z rotation angle applied to the input value, in degrees.
double zAngle;
public RotatePoint (ModuleBase sourceModule) throws ExceptionInvalidParam
{
super(1);
setSourceModule(0, sourceModule);
setAngles (DEFAULT_ROTATE_X, DEFAULT_ROTATE_Y, DEFAULT_ROTATE_Z);
}
public double getValue (double x, double y, double z)
{
assert (sourceModules[0] != null);
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 sourceModules[0].getValue (nx, ny, nz);
}
public void setAngles (double xAngle, double yAngle,
double zAngle)
{
double xCos, yCos, zCos, xSin, ySin, zSin;
xCos = Math.cos (Math.toRadians(xAngle));
yCos = Math.cos (Math.toRadians(yAngle));
zCos = Math.cos (Math.toRadians(zAngle));
xSin = Math.sin (Math.toRadians(xAngle));
ySin = Math.sin (Math.toRadians(yAngle));
zSin = Math.sin (Math.toRadians(zAngle));
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 = xAngle;
this.yAngle = yAngle;
this.zAngle = zAngle;
}
/// Returns the rotation angle around the @a x axis to apply to the
/// input value.
///
/// @returns The rotation angle around the @a x axis, in degrees.
public double getXAngle ()
{
return xAngle;
}
/// Returns the rotation angle around the @a y axis to apply to the
/// input value.
///
/// @returns The rotation angle around the @a y axis, in degrees.
public double getYAngle ()
{
return yAngle;
}
/// Returns the rotation angle around the @a z axis to apply to the
/// input value.
///
/// @returns The rotation angle around the @a z axis, in degrees.
public double getZAngle ()
{
return zAngle;
}
/// Sets the rotation angle around the @a x axis to apply to the input
/// value.
///
/// @param xAngle The rotation angle around the @a x axis, in degrees.
///
/// The getValue() method rotates the coordinates of the input value
/// around the origin before returning the output value from the
/// source module.
public void setXAngle (double xAngle)
{
setAngles (xAngle, this.yAngle, this.zAngle);
}
/// Sets the rotation angle around the @a y axis to apply to the input
/// value.
///
/// @param yAngle The rotation angle around the @a y axis, in degrees.
///
/// The getValue() method rotates the coordinates of the input value
/// around the origin before returning the output value from the
/// source module.
public void SetYAngle (double yAngle)
{
setAngles (this.xAngle, yAngle, this.zAngle);
}
/// Sets the rotation angle around the @a z axis to apply to the input
/// value.
///
/// @param zAngle The rotation angle around the @a z axis, in degrees.
///
/// The getValue() method rotates the coordinates of the input value
/// around the origin before returning the output value from the
/// source module.
public void SetZAngle (double zAngle)
{
setAngles (this.xAngle, this.yAngle, zAngle);
}
}
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