PostPointSymmetryWFFunc.java

/*
  JWildfire - an image and animation processor written in Java 
  Copyright (C) 1995-2015 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_2PI;
import static org.jwildfire.base.mathlib.MathLib.cos;
import static org.jwildfire.base.mathlib.MathLib.sin;

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

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

  private static final String PARAM_CENTRE_X = "centre_x";
  private static final String PARAM_CENTRE_Y = "centre_y";
  private static final String PARAM_ORDER = "order";
  private static final String[] paramNames = { PARAM_CENTRE_X, PARAM_CENTRE_Y, PARAM_ORDER };

  private double centre_x = 0.25;
  private double centre_y = 0.5;
  private int order = 3;

  @Override
  public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
    double dx = (pVarTP.x - centre_x) * pAmount;
    double dy = (pVarTP.y - centre_y) * pAmount;
    int idx = pContext.random(order);
    pVarTP.x = centre_x + dx * _cosa[idx] + dy * _sina[idx];
    pVarTP.y = centre_y + dy * _cosa[idx] - dx * _sina[idx];
    if (pContext.isPreserveZCoordinate()) {
      pVarTP.z += pAmount * pAffineTP.z;
    }
  }

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

  @Override
  public Object[] getParameterValues() {
    return new Object[] { centre_x, centre_y, order };
  }

  @Override
  public void setParameter(String pName, double pValue) {
    if (PARAM_CENTRE_X.equalsIgnoreCase(pName))
      centre_x = pValue;
    else if (PARAM_CENTRE_Y.equalsIgnoreCase(pName))
      centre_y = pValue;
    else if (PARAM_ORDER.equalsIgnoreCase(pName))
      order = limitIntVal(Tools.FTOI(pValue), 1, Integer.MAX_VALUE);
    else
      throw new IllegalArgumentException(pName);
  }

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

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

  private double _sina[], _cosa[];

  @Override
  public void init(FlameTransformationContext pContext, Layer pLayer, XForm pXForm, double pAmount) {
    _sina = new double[order];
    _cosa = new double[order];
    double da = M_2PI / (double) order;
    double angle = 0.0;
    for (int i = 0; i < order; i++) {
      _sina[i] = sin(angle);
      _cosa[i] = cos(angle);
      angle += da;
    }
  }

}