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 

    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 }