PostCurl3DFunc.java

/*
  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 org.jwildfire.create.tina.base.Layer;
import org.jwildfire.create.tina.base.XForm;
import org.jwildfire.create.tina.base.XYZPoint;

public class PostCurl3DFunc extends VariationFunc {
  private static final long serialVersionUID = 1L;

  private static final String PARAM_CX = "cx";
  private static final String PARAM_CY = "cy";
  private static final String PARAM_CZ = "cz";
  private static final String[] paramNames = { PARAM_CX, PARAM_CY, PARAM_CZ };

  private double cx = 0;
  private double cy = 0;
  private double cz = 0;

  private double sqr(double pVal) {
    return pVal * pVal;
  }

  @Override
  public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
    double r2 = sqr(pVarTP.x) + sqr(pVarTP.y) + sqr(pVarTP.z);
    double r = 1.0 / (r2 * _c_2 + _c2x * pVarTP.x - _c2y * pVarTP.y + _c2z * pVarTP.z + 1.0);
    pVarTP.x = r * (pVarTP.x + _cx * r2);
    pVarTP.y = r * (pVarTP.y + _cy * r2);
    pVarTP.z = r * (pVarTP.z + _cz * r2);
  }

  @Override
  public String[] getParameterNames() {
    return paramNames;
  }

  @Override
  public Object[] getParameterValues() {
    return new Object[] { cx, cy, cz };
  }

  @Override
  public void setParameter(String pName, double pValue) {
    if (PARAM_CX.equalsIgnoreCase(pName))
      cx = pValue;
    else if (PARAM_CY.equalsIgnoreCase(pName))
      cy = pValue;
    else if (PARAM_CZ.equalsIgnoreCase(pName))
      cz = pValue;
    else
      throw new IllegalArgumentException(pName);
  }

  @Override
  public String getName() {
    return "post_curl3D";
  }

  @Override
  public int getPriority() {
    return 1;
  }

  private double _cx, _cy, _cz, _c2x, _c2y, _c2z, _cx2, _cy2, _cz2, _c_2;

  @Override
  public void init(FlameTransformationContext pContext, Layer pLayer, XForm pXForm, double pAmount) {
    _cx = pAmount * cx;
    _cy = pAmount * cy;
    _cz = pAmount * cz;

    _c2x = 2 * _cx;
    _c2y = 2 * _cy;
    _c2z = 2 * _cz;

    _cx2 = sqr(_cx);
    _cy2 = sqr(_cy);
    _cz2 = sqr(_cz);

    _c_2 = _cx2 + _cy2 + _cz2;
  }

}