src/Eye.java

   1 import java.awt.Color;
   2 import java.util.List;
   3 import java.util.Arrays;
   4
   5 public class Eye implements Comparable<Eye> {
   6     private Color color;
   7     private List<String> colorList = Arrays.asList("black", "green", "blue", "brown");
   8
   9     Eye(String color) {
  10         setColor(color);
  11     }
  12
  13     public Color getColor() {
  14         return color;
  15     }
  16
  17     public void setColor(String color) {
  18         if (validateColor(color)) {
  19             if (color.equals("brown"))
  20                 this.color = new Color(88, 41, 0);
  21             else
  22                 this.color = Color.getColor(color);
  23
  24         } else {
  25             throw new IllegalArgumentException("Color must be " + colorList.toString());
  26         }
  27     }
  28
  29     private boolean validateColor(String color) {
  30         return colorList.contains(color);
  31     }
  32
  33     @Override
  34     public int compareTo(Eye eye) {
  35         double r_diff = this.getColor().getRed() - eye.getColor().getRed();
  36         double g_diff = this.getColor().getGreen() - eye.getColor().getGreen();
  37         double b_diff = this.getColor().getBlue() - eye.getColor().getBlue();
  38         // See https://en.wikipedia.org/wiki/Color_difference
  39         Double distance = Math.sqrt(2 * Math.pow(r_diff, 2) + 4 * Math.pow(g_diff, 2) + 3 * Math.pow(b_diff, 2));
  40         return distance.intValue();
  41     }
  42 }