/*
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.SMALL_EPSILON;
import static org.jwildfire.base.mathlib.MathLib.cos;
import static org.jwildfire.base.mathlib.MathLib.sin;
import static org.jwildfire.base.mathlib.MathLib.sqrt;
import org.jwildfire.create.tina.base.XForm;
import org.jwildfire.create.tina.base.XYZPoint;
public class FanFunc extends SimpleVariationFunc {
private static final long serialVersionUID = 1L;
@Override
public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
double dx = M_PI * pXForm.getCoeff20() * pXForm.getCoeff20() + SMALL_EPSILON;
double dx2 = dx / 2;
double a;
if ((pAffineTP.getPrecalcAtan() + pXForm.getCoeff21() - ((int) ((pAffineTP.getPrecalcAtan() + pXForm.getCoeff21()) / dx)) * dx) > dx2)
a = pAffineTP.getPrecalcAtan() - dx2;
else
a = pAffineTP.getPrecalcAtan() + dx2;
double sinr = sin(a);
double cosr = cos(a);
double r = pAmount * sqrt(pAffineTP.x * pAffineTP.x + pAffineTP.y * pAffineTP.y);
pVarTP.x += r * cosr;
pVarTP.y += r * sinr;
if (pContext.isPreserveZCoordinate()) {
pVarTP.z += pAmount * pAffineTP.z;
}
}
@Override
public String getName() {
return "fan";
}
}