/*
  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 java.util.Random;

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 PreStabilizeFunc extends VariationFunc {
  private static final long serialVersionUID = 1L;

  private static final String PARAM_N = "n";
  private static final String PARAM_SEED = "seed";
  private static final String PARAM_P = "p";
  private static final String PARAM_DC = "dc";
  private static final String[] paramNames = { PARAM_N, PARAM_SEED, PARAM_P, PARAM_DC };

  private int n = 4;
  private int seed = (int) (Math.random() * 100000);
  private double p = 0.1;
  private int dc = 0;
  private Random rand = new Random();
  private double[] x, y, c;
  private boolean start = true;
  private double nextColor, colorDelta;

  @Override
  public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
    // pre_stabilize by Rick Sidwell, works as glitch repellent

    if (start || pContext.random() < p / 1000) {
      start = false;
      int i = pContext.random(n);
      pAffineTP.x = x[i];
      pAffineTP.y = y[i];
      pAffineTP.z = 0;
      if (dc != 0) pAffineTP.color = c[i];
    }
  }

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

  @Override
  public Object[] getParameterValues() {
    return new Object[] { n, seed, p, dc };
  }

  @Override
  public void setParameter(String pName, double pValue) {
    if (PARAM_N.equalsIgnoreCase(pName))
      n = Tools.FTOI(pValue);
    else if (PARAM_SEED.equalsIgnoreCase(pName))
      seed = Tools.FTOI(pValue);
    else if (PARAM_P.equalsIgnoreCase(pName))
      p = pValue;
    else if (PARAM_DC.equalsIgnoreCase(pName))
      dc = limitIntVal(Tools.FTOI(pValue), 0, 1);
    else
      throw new IllegalArgumentException(pName);
  }

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

  @Override
  public void init(FlameTransformationContext pContext, Layer pLayer, XForm pXForm, double pAmount) {
    if (n < 1)
      n = 1;

    x = new double[n];
    y = new double[n];
    c = new double[n];

    rand.setSeed(seed);
    nextColor = 0.5;
    colorDelta = 1.0;

    for (int i = 0; i < n; i++) {
      x[i] = rand.nextDouble() * 2 - 1;
      y[i] = rand.nextDouble() * 2 - 1;
      c[i] = nextColor;
      nextColor += colorDelta;
      if (nextColor >= 1) {
    	  colorDelta /= 2;
    	  nextColor = colorDelta / 2;
      }
    }

    start = true;

  }

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

}