DevilWarpFunc.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 static org.jwildfire.base.mathlib.MathLib.pow;

import org.jwildfire.create.tina.base.XForm;
import org.jwildfire.create.tina.base.XYZPoint;

public class DevilWarpFunc 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 PARAM_EFFECT = "effect";
  private static final String PARAM_WARP = "warp";
  private static final String PARAM_RMIN = "rmin";
  private static final String PARAM_RMAX = "rmax";
  private static final String[] paramNames = { PARAM_A, PARAM_B, PARAM_EFFECT, PARAM_WARP, PARAM_RMIN, PARAM_RMAX };
  private double a = 2.0;
  private double b = 1.0;
  private double effect = 1.0;
  private double warp = 0.5;
  private double rmin = -0.24;
  private double rmax = 100;

  @Override
  public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
    /* devil_warp by dark-beam */
    double xx = pAffineTP.x;
    double yy = pAffineTP.y;
    double r2 = 1.0 / (xx * xx + yy * yy);
    double r = pow(xx * xx + r2 * b * yy * yy, warp) - pow(yy * yy + r2 * a * xx * xx, warp);
    if (r > rmax)
      r = rmax;
    else if (r < rmin)
      r = rmin;
    r = effect * (r);
    pVarTP.x += xx * (1 + r);
    pVarTP.y += yy * (1 + r);
    if (pContext.isPreserveZCoordinate()) {
  pVarTP.z += pAmount * pAffineTP.z;
}
  }

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

  @Override
  public Object[] getParameterValues() {
    return new Object[] { a, b, effect, warp, rmin, rmax };
  }

  @Override
  public void setParameter(String pName, double pValue) {
    if (PARAM_A.equalsIgnoreCase(pName))
      a = pValue;
    else if (PARAM_B.equalsIgnoreCase(pName))
      b = pValue;
    else if (PARAM_EFFECT.equalsIgnoreCase(pName))
      effect = pValue;
    else if (PARAM_WARP.equalsIgnoreCase(pName))
      warp = pValue;
    else if (PARAM_RMIN.equalsIgnoreCase(pName))
      rmin = pValue;
    else if (PARAM_RMAX.equalsIgnoreCase(pName))
      rmax = pValue;
    else
      throw new IllegalArgumentException(pName);
  }

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

}