| /* |
| * 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 ColorModelHSL extends ColorModel { |
| |
| ColorModelHSL() { |
| super("hsl", "Hue", "Saturation", "Lightness", "Transparency"); // NON-NLS: components |
| } |
| |
| @Override |
| void setColor(int color, float[] space) { |
| super.setColor(color, space); |
| RGBtoHSL(space, space); |
| space[3] = 1.0f - space[3]; |
| } |
| |
| @Override |
| int getColor(float[] space) { |
| space[3] = 1.0f - space[3]; |
| HSLtoRGB(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 : (index == 2) ? 0.5f : 1.0f; |
| } |
| |
| /** |
| * Converts HSL components of a color to a set of RGB components. |
| * |
| * @param hsl a float array with length equal to |
| * the number of HSL 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[] HSLtoRGB(float[] hsl, float[] rgb) { |
| if (rgb == null) { |
| rgb = new float[3]; |
| } |
| float hue = hsl[0]; |
| float saturation = hsl[1]; |
| float lightness = hsl[2]; |
| |
| if (saturation > 0.0f) { |
| hue = (hue < 1.0f) ? hue * 6.0f : 0.0f; |
| float q = lightness + saturation * ((lightness > 0.5f) ? 1.0f - lightness : lightness); |
| float p = 2.0f * lightness - q; |
| rgb[0]= normalize(q, p, (hue < 4.0f) ? (hue + 2.0f) : (hue - 4.0f)); |
| rgb[1]= normalize(q, p, hue); |
| rgb[2]= normalize(q, p, (hue < 2.0f) ? (hue + 4.0f) : (hue - 2.0f)); |
| } |
| else { |
| rgb[0] = lightness; |
| rgb[1] = lightness; |
| rgb[2] = lightness; |
| } |
| return rgb; |
| } |
| |
| /** |
| * Converts RGB components of a color to a set of HSL components. |
| * |
| * @param rgb a float array with length of at least 3 |
| * that contains RGB components of a color |
| * @param hsl a float array with length equal to |
| * the number of HSL components |
| * @return a float array that contains HSL components |
| */ |
| private static float[] RGBtoHSL(float[] rgb, float[] hsl) { |
| if (hsl == null) { |
| hsl = new float[3]; |
| } |
| float max = max(rgb[0], rgb[1], rgb[2]); |
| float min = min(rgb[0], rgb[1], rgb[2]); |
| |
| float summa = max + min; |
| float saturation = max - min; |
| if (saturation > 0.0f) { |
| saturation /= (summa > 1.0f) |
| ? 2.0f - summa |
| : summa; |
| } |
| hsl[0] = getHue(rgb[0], rgb[1], rgb[2], max, min); |
| hsl[1] = saturation; |
| hsl[2] = summa / 2.0f; |
| return hsl; |
| } |
| |
| /** |
| * Returns the smaller of three color components. |
| * |
| * @param red the red component of the color |
| * @param green the green component of the color |
| * @param blue the blue component of the color |
| * @return the smaller of {@code red}, {@code green} and {@code blue} |
| */ |
| static float min(float red, float green, float blue) { |
| float min = (red < green) ? red : green; |
| return (min < blue) ? min : blue; |
| } |
| |
| /** |
| * Returns the larger of three color components. |
| * |
| * @param red the red component of the color |
| * @param green the green component of the color |
| * @param blue the blue component of the color |
| * @return the larger of {@code red}, {@code green} and {@code blue} |
| */ |
| static float max(float red, float green, float blue) { |
| float max = (red > green) ? red : green; |
| return (max > blue) ? max : blue; |
| } |
| |
| /** |
| * Calculates the hue component for HSL and HSV color spaces. |
| * |
| * @param red the red component of the color |
| * @param green the green component of the color |
| * @param blue the blue component of the color |
| * @param max the larger of {@code red}, {@code green} and {@code blue} |
| * @param min the smaller of {@code red}, {@code green} and {@code blue} |
| * @return the hue component |
| */ |
| static float getHue(float red, float green, float blue, float max, float min) { |
| float hue = max - min; |
| if (hue > 0.0f) { |
| if (max == red) { |
| hue = (green - blue) / hue; |
| if (hue < 0.0f) { |
| hue += 6.0f; |
| } |
| } |
| else if (max == green) { |
| hue = 2.0f + (blue - red) / hue; |
| } |
| else /*max == blue*/ { |
| hue = 4.0f + (red - green) / hue; |
| } |
| hue /= 6.0f; |
| } |
| return hue; |
| } |
| |
| private static float normalize(float q, float p, float color) { |
| if (color < 1.0f) { |
| return p + (q - p) * color; |
| } |
| if (color < 3.0f) { |
| return q; |
| } |
| if (color < 4.0f) { |
| return p + (q - p) * (4.0f - color); |
| } |
| return p; |
| } |
| } |