/*
JWildfire - an image and animation processor written in Java
Copyright (C) 1995-2011 Andreas Maschke
This 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 2.1 of the
License, or (at your option) any later version.
This software 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 for more details.
You should have received a copy of the GNU Lesser General Public License along with this software;
if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jwildfire.create.tina.variation;
import static org.jwildfire.base.mathlib.MathLib.M_PI;
import static org.jwildfire.base.mathlib.MathLib.atan2;
import static org.jwildfire.base.mathlib.MathLib.cos;
import static org.jwildfire.base.mathlib.MathLib.cosh;
import static org.jwildfire.base.mathlib.MathLib.log;
import static org.jwildfire.base.mathlib.MathLib.sin;
import static org.jwildfire.base.mathlib.MathLib.sinh;
import static org.jwildfire.base.mathlib.MathLib.sqr;
import org.jwildfire.create.tina.base.XForm;
import org.jwildfire.create.tina.base.XYZPoint;
public class BSwirlFunc extends VariationFunc {
private static final long serialVersionUID = 1L;
private static final String PARAM_IN = "in";
private static final String PARAM_OUT = "out";
private static final String[] paramNames = { PARAM_IN, PARAM_OUT };
private double in = 0.0;
private double out = 0.0;
@Override
public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
// bSwirl by Michael Faber, http://michaelfaber.deviantart.com/art/bSeries-320574477
double tau, sigma;
double temp;
double cosht, sinht;
double sins, coss;
tau = 0.5 * (log(sqr(pAffineTP.x + 1.0) + sqr(pAffineTP.y)) - log(sqr(pAffineTP.x - 1.0) + sqr(pAffineTP.y)));
sigma = M_PI - atan2(pAffineTP.y, pAffineTP.x + 1.0) - atan2(pAffineTP.y, 1.0 - pAffineTP.x);
sigma = sigma + tau * out + in / tau;
sinht = sinh(tau);
cosht = cosh(tau);
sins = sin(sigma);
coss = cos(sigma);
temp = cosht - coss;
if (temp == 0) {
return;
}
pVarTP.x += pAmount * sinht / temp;
pVarTP.y += pAmount * sins / temp;
if (pContext.isPreserveZCoordinate()) {
pVarTP.z += pAmount * pAffineTP.z;
}
}
@Override
public String[] getParameterNames() {
return paramNames;
}
@Override
public Object[] getParameterValues() {
return new Object[] { in, out };
}
@Override
public void setParameter(String pName, double pValue) {
if (PARAM_IN.equalsIgnoreCase(pName))
in = pValue;
else if (PARAM_OUT.equalsIgnoreCase(pName))
out = pValue;
else
throw new IllegalArgumentException(pName);
}
@Override
public String getName() {
return "bSwirl";
}
}