FourthFunc.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.M_PI;
import static org.jwildfire.base.mathlib.MathLib.atan2;
import static org.jwildfire.base.mathlib.MathLib.cos;
import static org.jwildfire.base.mathlib.MathLib.sin;
import static org.jwildfire.base.mathlib.MathLib.sqr;
import static org.jwildfire.base.mathlib.MathLib.sqrt;

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

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

  private static final String PARAM_SPIN = "spin";
  private static final String PARAM_SPACE = "space";
  private static final String PARAM_TWIST = "twist";
  private static final String PARAM_X = "x";
  private static final String PARAM_Y = "y";
  private static final String[] paramNames = { PARAM_SPIN, PARAM_SPACE, PARAM_TWIST, PARAM_X, PARAM_Y };

  private double spin = M_PI;
  private double space = 0.0;
  private double twist = 0.0;
  private double x = 0.0;
  private double y = 0.0;

  @Override
  public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
    /* fourth from guagapunyaimel, http://amorinaashton.deviantart.com/art/Fourth-Plugin-175043938?q=favby%3Aamorinaashton%2F1243451&qo=14 */

    if (pAffineTP.x > 0.0 && pAffineTP.y > 0.0) //kuadran IV: spherical
    {
      double a = atan2(pAffineTP.y, pAffineTP.x);
      double r = 1.0 / sqrt(sqr(pAffineTP.x) + sqr(pAffineTP.y));
      double s = sin(a);
      double c = cos(a);
      pVarTP.x += pAmount * r * c;
      pVarTP.y += pAmount * r * s;
    }
    else if (pAffineTP.x > 0.0 && pAffineTP.y < 0.0) //kuadran I: loonie
    {
      double r2 = sqr(pAffineTP.x) + sqr(pAffineTP.y);

      if (r2 < this.sqrvvar)
      {
        double r = pAmount * sqrt(this.sqrvvar / r2 - 1.0);
        pVarTP.x += r * pAffineTP.x;
        pVarTP.y += r * pAffineTP.y;
      }
      else
      {
        pVarTP.x += pAmount * pAffineTP.x;
        pVarTP.y += pAmount * pAffineTP.y;
      }
    }

    else if (pAffineTP.x < 0.0 && pAffineTP.y > 0.0) // kuadran III: susan
    {
      double r;
      double sina, cosa;
      double x = pAffineTP.x - this.x;
      double y = pAffineTP.y + this.y;

      r = sqrt(x * x + y * y);

      if (r < pAmount) {
        double a = atan2(y, x) + this.spin + this.twist * (pAmount - r);
        sina = sin(a);
        cosa = cos(a);
        r = pAmount * r;
        pVarTP.x += r * cosa + this.x;
        pVarTP.y += r * sina - this.y;
      }
      else
      {
        r = pAmount * (1.0 + this.space / r);
        pVarTP.x += r * x + this.x;
        pVarTP.y += r * y - this.y;
      }
    }
    else //kuadran II: Linear
    {
      pVarTP.x += pAmount * pAffineTP.x;
      pVarTP.y += pAmount * pAffineTP.y;
    }

    if (pContext.isPreserveZCoordinate()) {
  pVarTP.z += pAmount * pAffineTP.z;
}

  }

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

  @Override
  public Object[] getParameterValues() {
    return new Object[] { spin, space, twist, x, y };
  }

  @Override
  public void setParameter(String pName, double pValue) {
    if (PARAM_SPIN.equalsIgnoreCase(pName))
      spin = pValue;
    else if (PARAM_SPACE.equalsIgnoreCase(pName))
      space = pValue;
    else if (PARAM_TWIST.equalsIgnoreCase(pName))
      twist = pValue;
    else if (PARAM_X.equalsIgnoreCase(pName))
      x = pValue;
    else if (PARAM_Y.equalsIgnoreCase(pName))
      y = pValue;
    else
      throw new IllegalArgumentException(pName);
  }

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

  private double sqrvvar;

  @Override
  public void init(FlameTransformationContext pContext, Layer pLayer, XForm pXForm, double pAmount) {
    sqrvvar = pAmount * pAmount;
  }
}