1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.colorpicker;
18
19import android.graphics.Color;
20
21import java.util.Comparator;
22
23/**
24 * A color comparator which compares based on hue, saturation, and value.
25 */
26public class HsvColorComparator implements Comparator<Integer> {
27
28    @Override
29    public int compare(Integer lhs, Integer rhs) {
30        float[] hsv = new float[3];
31        Color.colorToHSV(lhs, hsv);
32        float hue1 = hsv[0];
33        float sat1 = hsv[1];
34        float val1 = hsv[2];
35
36        float[] hsv2 = new float[3];
37        Color.colorToHSV(rhs, hsv2);
38        float hue2 = hsv2[0];
39        float sat2 = hsv2[1];
40        float val2 = hsv2[2];
41
42        if (hue1 < hue2) {
43            return 1;
44        } else if (hue1 > hue2) {
45            return -1;
46        } else {
47            if (sat1 < sat2) {
48                return 1;
49            } else if (sat1 > sat2) {
50                return -1;
51            } else {
52                if (val1 < val2) {
53                    return 1;
54                } else if (val1 > val2) {
55                    return -1;
56                }
57            }
58        }
59        return 0;
60    }
61}
62