/*
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.cos;
import static org.jwildfire.base.mathlib.MathLib.exp;
import static org.jwildfire.base.mathlib.MathLib.floor;
import static org.jwildfire.base.mathlib.MathLib.log;
import static org.jwildfire.base.mathlib.MathLib.sin;
import org.jwildfire.create.tina.base.XForm;
import org.jwildfire.create.tina.base.XYZPoint;
public class CPowFunc extends VariationFunc {
private static final long serialVersionUID = 1L;
private static final String PARAM_R = "r";
private static final String PARAM_I = "i";
private static final String PARAM_POWER = "power";
private static final String[] paramNames = { PARAM_R, PARAM_I, PARAM_POWER };
private double r = 1.0;
private double i = 0.1;
private double power = 1.5;
@Override
public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
/* Cpow in the Apophysis Plugin Pack */
double a = pAffineTP.getPrecalcAtanYX();
double lnr = 0.5 * log(pAffineTP.getPrecalcSumsq());
double va = 2.0 * M_PI / power;
double vc = r / power;
double vd = i / power;
double ang = vc * a + vd * lnr + va * floor(power * pContext.random());
double m = pAmount * exp(vc * lnr - vd * a);
double sa = sin(ang);
double ca = cos(ang);
pVarTP.x += m * ca;
pVarTP.y += m * sa;
if (pContext.isPreserveZCoordinate()) {
pVarTP.z += pAmount * pAffineTP.z;
}
}
@Override
public String[] getParameterNames() {
return paramNames;
}
@Override
public Object[] getParameterValues() {
return new Object[] { r, i, power };
}
@Override
public void setParameter(String pName, double pValue) {
if (PARAM_R.equalsIgnoreCase(pName))
r = pValue;
else if (PARAM_I.equalsIgnoreCase(pName))
i = pValue;
else if (PARAM_POWER.equalsIgnoreCase(pName))
power = pValue;
else
throw new IllegalArgumentException(pName);
}
@Override
public String getName() {
return "cpow";
}
}