/*
JWildfire - an image and animation processor written in Java
Copyright (C) 1995-2016 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.cos;
import static org.jwildfire.base.mathlib.MathLib.log;
import static org.jwildfire.base.mathlib.MathLib.sin;
import static org.jwildfire.base.mathlib.MathLib.tan;
import org.jwildfire.create.tina.base.XForm;
import org.jwildfire.create.tina.base.XYZPoint;
public class DinisSurfaceWFFunc extends VariationFunc {
private static final long serialVersionUID = 1L;
private static final String PARAM_A = "a";
private static final String PARAM_B = "b";
private static final String[] paramNames = { PARAM_A, PARAM_B };
private double a = 0.8;
private double b = 0.2;
@Override
public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
/* Dini's Surface, http://mathworld.wolfram.com/DinisSurface.html */
double u = pAffineTP.x;
double v = pAffineTP.y;
double sinv = sin(v);
pVarTP.x += pAmount * a * cos(u) * sinv;
pVarTP.y += pAmount * a * sin(u) * sinv;
pVarTP.z -= pAmount * (a * (cos(v) + log(tan(v / 2.0))) + b * u);
}
@Override
public String[] getParameterNames() {
return paramNames;
}
@Override
public Object[] getParameterValues() {
return new Object[] { a, b };
}
@Override
public void setParameter(String pName, double pValue) {
if (PARAM_A.equalsIgnoreCase(pName))
a = pValue;
else if (PARAM_B.equalsIgnoreCase(pName))
b = pValue;
else
throw new IllegalArgumentException(pName);
}
@Override
public String getName() {
return "dinis_surface_wf";
}
}