/*

 * Copyright (c) 2008, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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 javax.swing.colorchooser;

final class ColorModelHSV extends ColorModel {

    ColorModelHSV() {

        super("hsv", "Hue", "Saturation", "Value", "Transparency"); // NON-NLS: components

    }

    @Override

    void setColor(int color, float[] space) {

        super.setColor(color, space);

        RGBtoHSV(space, space);

        space[3] = 1.0f - space[3];

    }

    @Override

    int getColor(float[] space) {

        space[3] = 1.0f - space[3];

        HSVtoRGB(space, space);

        return super.getColor(space);

    }

    @Override

    int getMaximum(int index) {

        return (index == 0) ? 360 : 100;

    }

    @Override

    float getDefault(int index) {

        return (index == 0) ? -1.0f : 1.0f;

    }

    /**

     * Converts HSV components of a color to a set of RGB components.

     *

     * @param hsv  a float array with length equal to

     *             the number of HSV components

     * @param rgb  a float array with length of at least 3

     *             that contains RGB components of a color

     * @return a float array that contains RGB components

     */

    private static float[] HSVtoRGB(float[] hsv, float[] rgb) {

        if (rgb == null) {

            rgb = new float[3];

        }

        float hue = hsv[0];

        float saturation = hsv[1];

        float value = hsv[2];

        rgb[0] = value;

        rgb[1] = value;

        rgb[2] = value;

        if (saturation > 0.0f) {

            hue = (hue < 1.0f) ? hue * 6.0f : 0.0f;

            int integer = (int) hue;

            float f = hue - (float) integer;

            switch (integer) {

                case 0:

                    rgb[1] *= 1.0f - saturation * (1.0f - f);

                    rgb[2] *= 1.0f - saturation;

                    break;

                case 1:

                    rgb[0] *= 1.0f - saturation * f;

                    rgb[2] *= 1.0f - saturation;

                    break;

                case 2:

                    rgb[0] *= 1.0f - saturation;

                    rgb[2] *= 1.0f - saturation * (1.0f - f);

                    break;

                case 3:

                    rgb[0] *= 1.0f - saturation;

                    rgb[1] *= 1.0f - saturation * f;

                    break;

                case 4:

                    rgb[0] *= 1.0f - saturation * (1.0f - f);

                    rgb[1] *= 1.0f - saturation;

                    break;

                case 5:

                    rgb[1] *= 1.0f - saturation;

                    rgb[2] *= 1.0f - saturation * f;

                    break;

            }

        }

        return rgb;

    }

    /**

     * Converts RGB components of a color to a set of HSV components.

     *

     * @param rgb  a float array with length of at least 3

     *             that contains RGB components of a color

     * @param hsv  a float array with length equal to

     *             the number of HSV components

     * @return a float array that contains HSV components

     */

    private static float[] RGBtoHSV(float[] rgb, float[] hsv) {

        if (hsv == null) {

            hsv = new float[3];

        }

        float max = ColorModelHSL.max(rgb[0], rgb[1], rgb[2]);

        float min = ColorModelHSL.min(rgb[0], rgb[1], rgb[2]);

        float saturation = max - min;

        if (saturation > 0.0f) {

            saturation /= max;

        }

        hsv[0] = ColorModelHSL.getHue(rgb[0], rgb[1], rgb[2], max, min);

        hsv[1] = saturation;

        hsv[2] = max;

        return hsv;

    }

}