/*
  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;

import static org.jwildfire.base.mathlib.MathLib.*;

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

  private static final String PARAM_LEVELS = "levels";

  private static final String[] paramNames = {PARAM_LEVELS};
  
  private int levels = 6;

  @Override
  public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
    int level = (int) (sqrt(pContext.random()) * levels);
    int n = 1 << level;
    double radius = pAmount / n;
    double x = topLeftx + radius / sqrt(2.0) + ((int) pContext.random(n)) * radius * sqrt(2.0);
    double y = topLefty + radius / sqrt(2.0) + ((int) pContext.random(n)) * radius * sqrt(2.0);
    double theta = pContext.random() * M_2PI;
    pVarTP.x += radius * cos(theta) + x;
    pVarTP.y += radius * sin(theta) + y;

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

  }

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

  @Override
  public Object[] getParameterValues() {
    return new Object[]{levels};
  }

  @Override
  public void setParameter(String pName, double pValue) {
    if (PARAM_LEVELS.equalsIgnoreCase(pName))
      levels = (int) limitVal(pValue, 1, 10);
    else
      throw new IllegalArgumentException(pName);
  }

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

  private double topLeftx, topLefty;
  
  @Override
  public void init(FlameTransformationContext pContext, Layer pLayer, XForm pXForm, double pAmount) {
    topLeftx = topLefty = -pAmount / sqrt(2.0);
  }

  @Override
  public VariationFuncType[] getVariationTypes() {
    return new VariationFuncType[]{VariationFuncType.VARTYPE_BASE_SHAPE};
  }

}