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  */
23 package com.sun.swingset3.demos.spinner;
24 
25 /**
26  * @author Mikhail Lapshin
27  */
28 import java.awt.*;
29 
30 public 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 
Palette(int totalRange, int minColor, int maxColor, double rStart, double gStart, double bStart, int rSteps, int gSteps, int bSteps)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 
setSize(int newSize)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 
fillColorTable()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 
getColor(int index)84     public Color getColor(int index) {
85         return colors[index];
86     }
87 
getRgbColor(int index)88     public int getRgbColor(int index) {
89         return rgbColors[index];
90     }
91 
getSize()92     public int getSize() {
93         return totalRange;
94     }
95 }
96