UVColorMapper.java

/*
  JWildfire - an image and animation processor written in Java 
  Copyright (C) 1995-2017 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.mesh;

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

import java.util.HashMap;
import java.util.Map;

import org.jwildfire.create.tina.base.Layer;
import org.jwildfire.create.tina.palette.RenderColor;
import org.jwildfire.create.tina.variation.FlameTransformationContext;

public class UVColorMapper {
  private RenderColor[] uvColors;
  private Map<RenderColor, Double> uvIdxMap = new HashMap<RenderColor, Double>();

  public void initFromLayer(FlameTransformationContext context, Layer layer) {
    uvColors = layer.getPalette().createRenderPalette(context.getFlameRenderer().getFlame().getWhiteLevel());
  }

  public void clear() {
    uvIdxMap.clear();
  }

  public double getUVColorIdx(int pR, int pG, int pB) {
    RenderColor pColor = new RenderColor(pR, pG, pB);
    Double res = uvIdxMap.get(pColor);
    if (res == null) {

      int nearestIdx = 0;
      RenderColor color = uvColors[0];
      double dr, dg, db;
      dr = (color.red - pR);
      dg = (color.green - pG);
      db = (color.blue - pB);
      double nearestDist = sqrt(dr * dr + dg * dg + db * db);
      for (int i = 1; i < uvColors.length; i++) {
        color = uvColors[i];
        dr = (color.red - pR);
        dg = (color.green - pG);
        db = (color.blue - pB);
        double dist = sqrt(dr * dr + dg * dg + db * db);
        if (dist < nearestDist) {
          nearestDist = dist;
          nearestIdx = i;
        }
      }
      res = (double) nearestIdx / (double) (uvColors.length - 1);
      uvIdxMap.put(pColor, res);
    }
    return res;
  }

}