/*

 * Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.swingset3.demos.spinner;

/**

 * @author Mikhail Lapshin

 */

import java.awt.*;

public class Palette {

    private final int minColor;

    private final int colorRange;

    private Color[] colors;

    private int[] rgbColors;

    private final int rSteps;

    private final int gSteps;

    private final int bSteps;

    private int totalRange;

    private int rRange;

    private int gRange;

    private int bRange;

    private final double rStart;

    private final double gStart;

    private final double bStart;

    public Palette(int totalRange, int minColor, int maxColor, double rStart,

            double gStart, double bStart, int rSteps, int gSteps, int bSteps) {

        this.minColor = minColor;

        this.colorRange = maxColor - minColor;

        this.rStart = rStart;

        this.gStart = gStart;

        this.bStart = bStart;

        this.rSteps = rSteps;

        this.gSteps = gSteps;

        this.bSteps = bSteps;

        setSize(totalRange);

    }

    public void setSize(int newSize) {

        totalRange = newSize;

        rRange = totalRange / rSteps;

        gRange = totalRange / gSteps;

        bRange = totalRange / bSteps;

        fillColorTable();

    }

    private void fillColorTable() {

        colors = new Color[totalRange];

        rgbColors = new int[totalRange];

        for (int i = 0; i < totalRange; i++) {

            double cosR = Math.cos(i * 2 * Math.PI / rRange + rStart);

            double cosG = Math.cos(i * 2 * Math.PI / gRange + gStart);

            double cosB = Math.cos(i * 2 * Math.PI / bRange + bStart);

            Color color = new Color(

                    (int) ((cosR * colorRange) + colorRange) / 2 + minColor,

                    (int) ((cosG * colorRange) + colorRange) / 2 + minColor,

                    (int) ((cosB * colorRange) + colorRange) / 2 + minColor);

            colors[i] = color;

            rgbColors[i] = color.getRGB();

        }

    }

    public Color getColor(int index) {

        return colors[index];

    }

    public int getRgbColor(int index) {

        return rgbColors[index];

    }

    public int getSize() {

        return totalRange;

    }

}