1/*
2 * Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23package com.sun.swingset3.demos.spinner;
24
25/**
26 * @author Mikhail Lapshin
27 */
28import java.awt.*;
29
30public class Palette {
31
32    private final int minColor;
33    private final int colorRange;
34    private Color[] colors;
35    private int[] rgbColors;
36    private final int rSteps;
37    private final int gSteps;
38    private final int bSteps;
39    private int totalRange;
40    private int rRange;
41    private int gRange;
42    private int bRange;
43    private final double rStart;
44    private final double gStart;
45    private final double bStart;
46
47    public Palette(int totalRange, int minColor, int maxColor, double rStart,
48            double gStart, double bStart, int rSteps, int gSteps, int bSteps) {
49        this.minColor = minColor;
50        this.colorRange = maxColor - minColor;
51        this.rStart = rStart;
52        this.gStart = gStart;
53        this.bStart = bStart;
54        this.rSteps = rSteps;
55        this.gSteps = gSteps;
56        this.bSteps = bSteps;
57        setSize(totalRange);
58    }
59
60    public void setSize(int newSize) {
61        totalRange = newSize;
62        rRange = totalRange / rSteps;
63        gRange = totalRange / gSteps;
64        bRange = totalRange / bSteps;
65        fillColorTable();
66    }
67
68    private void fillColorTable() {
69        colors = new Color[totalRange];
70        rgbColors = new int[totalRange];
71        for (int i = 0; i < totalRange; i++) {
72            double cosR = Math.cos(i * 2 * Math.PI / rRange + rStart);
73            double cosG = Math.cos(i * 2 * Math.PI / gRange + gStart);
74            double cosB = Math.cos(i * 2 * Math.PI / bRange + bStart);
75            Color color = new Color(
76                    (int) ((cosR * colorRange) + colorRange) / 2 + minColor,
77                    (int) ((cosG * colorRange) + colorRange) / 2 + minColor,
78                    (int) ((cosB * colorRange) + colorRange) / 2 + minColor);
79            colors[i] = color;
80            rgbColors[i] = color.getRGB();
81        }
82    }
83
84    public Color getColor(int index) {
85        return colors[index];
86    }
87
88    public int getRgbColor(int index) {
89        return rgbColors[index];
90    }
91
92    public int getSize() {
93        return totalRange;
94    }
95}
96