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     /**
  10      * @param color
  11      */
  12     Eye(String color) {
  13         setColor(color);
  14     }
  15
  16     /**
  17      * @return
  18      */
  19     public Color getColor() {
  20         return color;
  21     }
  22
  23     /**
  24      * @param color
  25      */
  26     public void setColor(String color) {
  27         if (validateColor(color)) {
  28             if (color.equals("brown"))
  29                 this.color = new Color(88, 41, 0);
  30             else
  31                 this.color = Color.getColor(color);
  32
  33         } else {
  34             throw new IllegalArgumentException("Color must be " + colorList.toString());
  35         }
  36     }
  37
  38     /**
  39      * @param color
  40      * @return
  41      */
  42     private boolean validateColor(String color) {
  43         return colorList.contains(color);
  44     }
  45
  46     /**
  47      * @param eye
  48      * @return
  49      */
  50     @Override
  51     public int compareTo(Eye eye) {
  52         double r_diff = this.getColor().getRed() - eye.getColor().getRed();
  53         double g_diff = this.getColor().getGreen() - eye.getColor().getGreen();
  54         double b_diff = this.getColor().getBlue() - eye.getColor().getBlue();
  55         // See https://en.wikipedia.org/wiki/Color_difference
  56         Double distance = Math.sqrt(2 * Math.pow(r_diff, 2) + 4 * Math.pow(g_diff, 2) + 3 * Math.pow(b_diff, 2));
  57         return distance.intValue();
  58     }
  59 }