content: /*
   * Copyright (C) 2013 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.colorpicker;
  
  import android.graphics.Color;
  
  import java.util.Comparator;
  
  /**
   * A color comparator which compares based on hue, saturation, and value.
   */
  public class HsvColorComparator implements Comparator<Integer> {
  
      @Override
      public int compare(Integer lhs, Integer rhs) {
          float[] hsv = new float[3];
          Color.colorToHSV(lhs, hsv);
          float hue1 = hsv[0];
          float sat1 = hsv[1];
          float val1 = hsv[2];
  
          float[] hsv2 = new float[3];
          Color.colorToHSV(rhs, hsv2);
          float hue2 = hsv2[0];
          float sat2 = hsv2[1];
          float val2 = hsv2[2];
  
          if (hue1 < hue2) {
              return 1;
          } else if (hue1 > hue2) {
              return -1;
          } else {
              if (sat1 < sat2) {
                  return 1;
              } else if (sat1 > sat2) {
                  return -1;
              } else {
                  if (val1 < val2) {
                      return 1;
                  } else if (val1 > val2) {
                      return -1;
                  }
              }
          }
          return 0;
      }
  }
  