/*
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.atan2;
import static org.jwildfire.base.mathlib.MathLib.sinAndCos;
import static org.jwildfire.base.mathlib.MathLib.sqr;
import static org.jwildfire.base.mathlib.MathLib.sqrt;
import odk.lang.DoubleWrapper;
import org.jwildfire.create.tina.base.XForm;
import org.jwildfire.create.tina.base.XYZPoint;
public class DeltaAFunc extends SimpleVariationFunc {
private static final long serialVersionUID = 1L;
private DoubleWrapper sina = new DoubleWrapper();
private DoubleWrapper cosa = new DoubleWrapper();
@Override
public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
// deltaA my Michael Faber, http://michaelfaber.deviantart.com/art/The-Lost-Variations-258913970 */
double avgr = pAmount * (sqrt(sqr(pAffineTP.y) + sqr(pAffineTP.x + 1.0)) / sqrt(sqr(pAffineTP.y) + sqr(pAffineTP.x - 1.0)));
double avga = (atan2(pAffineTP.y, pAffineTP.x - 1.0) - atan2(pAffineTP.y, pAffineTP.x + 1.0)) / 2.0;
sinAndCos(avga, sina, cosa);
pVarTP.x += avgr * cosa.value;
pVarTP.y += avgr * sina.value;
if (pContext.isPreserveZCoordinate()) {
pVarTP.z += pAmount * pAffineTP.z;
}
}
@Override
public String getName() {
return "deltaA";
}
}