/*
* 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
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*/
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;
}
}