Android Open Source - AnkiStats Relative Color Gradient

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * /*  w ww.j  av  a 2  s.c  om*/
 */
package com.wildplot.android.rendering;


import java.util.Vector;

import com.wildplot.android.rendering.graphics.wrapper.Color;

/**
 * @author Michael Goldbach
 *
 */
public class RelativeColorGradient {
  public static Color[] makeGradient(Vector<Color> colorVector, int numberOfColorsInGradient) {
    if(colorVector == null) {
      colorVector = new Vector<Color>();
    }
    
    if(colorVector.size() < 2) {
      colorVector.add(new Color(255,255,255));
      if(colorVector.size() < 2) {
        colorVector.add(0, new Color(0,0,0));
      }
    }
    numberOfColorsInGradient -= colorVector.size();
    
    while(numberOfColorsInGradient >= 0) {
      Color firstColor = colorVector.get(0);
      Color secondColor = colorVector.get(1);
      int index = 1;
      double highestDelta = 0;
      
      //determine the color with the biggest difference to the color before in the vector
      for(int i = 1; i<colorVector.size(); i++) {
        secondColor = colorVector.get(i);
        double delta  = delta(firstColor.getRed(), secondColor.getRed());
        delta  += delta(firstColor.getGreen(), secondColor.getGreen());
        delta  += delta(firstColor.getBlue(), secondColor.getBlue());
        delta = Math.pow(delta, 1.0/3.0);
        if(delta > highestDelta) {
          highestDelta = delta;
          index = i;
        }
        firstColor = secondColor;
      }
      
      //add new Color between those two colors, new color is middled between those two
      firstColor  = colorVector.get(index-1);
      secondColor  = colorVector.get(index);
      int newRed    = firstColor.getRed() - (firstColor.getRed() - secondColor.getRed())/2;
      int newGreen   = firstColor.getGreen() - (firstColor.getGreen() - secondColor.getGreen())/2;
      int newBlue   = firstColor.getBlue() - (firstColor.getBlue() - secondColor.getBlue())/2;
      
      colorVector.add(index, new Color(newRed, newGreen, newBlue));
      numberOfColorsInGradient--;
    }
    
    
    return colorVector.toArray(new Color[colorVector.size()]);
  }
  private static double delta(int first, int second) {
    return Math.pow(Math.abs(first -second), 3);
  }
  
  
  
}

Java Source Code List

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