Here you can find the source of darker(Color color)
Color that is a darker version of the specified Color.
Color object that is a darker version of the specified Color.
public static Color darker(Color color)
//package com.java2s; /*//from www . j a v a 2 s .c om * Copyright (c) 2010 ANDRE S?bastien (divxdede). All rights reserved. * ColorUtilities.java is a part of this Commons library * ==================================================================== * * Commons library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation, either version 3 of the License, * or any later version. * * This 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see <http://www.gnu.org/licenses/>. */ import java.awt.Color; public class Main { /** * Creates a new <code>Color</code> that is a darker version of the specified <code>Color</code>. * <p> * This method convert color's RGB components into an HSL color model.<br> * After what the <strong>Lightness</strong> component is <strong>decreased</strong> of 25.1% * <p> * Be carefull, this method don't provide same result than the {@link Color#darker()} method. * * @return a new <code>Color</code> object that is a darker version of the specified <code>Color</code>. */ public static Color darker(Color color) { return darker(color, 0.251f); } /** * Creates a new <code>Color</code> that is a darker version of the specified <code>Color</code>. * <p> * This method convert color's RGB components into an HSL color model.<br> * After what the <strong>Lightness</strong> component is <strong>decreased</strong> with the specified factor <code>(lightness = lightness * (1-factor))</code><br> * <ul> * <li>A factor of 0.0f will result in the same color as the original.</li> * <li>A factor of 1.0f will result in the BLACK color</li> * </ul> * <p> * Be carefull, this method don't provide same result than the {@link Color#darker()} method. * * @return a new <code>Color</code> object that is a darker version of the specified <code>Color</code>. */ public static Color darker(Color color, float factor) { if (factor == 0f) return color; if (factor >= 1f) return new Color(0, 0, 0, color.getAlpha()); float[] hsl = RGBtoHSL(color.getRed(), color.getGreen(), color.getBlue()); hsl[2] = hsl[2] * (1f - factor); int[] rgb = HSLtoRGB(hsl[0], hsl[1], hsl[2], null); return new Color(rgb[0], rgb[1], rgb[2], color.getAlpha()); } /** * <p>Returns the HSL (Hue/Saturation/Luminance) equivalent of a given * RGB color. All three HSL components are between 0.0 and 1.0.</p> * * Copyright 2005 Sun Microsystems, Inc., 4150 Network Circle, * Santa Clara, California 95054, U.S.A. All rights reserved. * * Copyright (c) 2006 Romain Guy <romain.guy@mac.com> * All rights reserved. * * @param color the RGB color to convert * @return a new array of 3 floats corresponding to the HSL components */ private static float[] RGBtoHSL(Color color) { return RGBtoHSL(color.getRed(), color.getGreen(), color.getBlue(), null); } /** * <p>Returns the HSL (Hue/Saturation/Luminance) equivalent of a given * RGB color. All three HSL components are between 0.0 and 1.0.</p> * * Copyright 2005 Sun Microsystems, Inc., 4150 Network Circle, * Santa Clara, California 95054, U.S.A. All rights reserved. * * Copyright (c) 2006 Romain Guy <romain.guy@mac.com> * All rights reserved. * * @param color the RGB color to convert * @param hsl a pre-allocated array of floats; can be null * @return <code>hsl</code> if non-null, a new array of 3 floats otherwise * @throws IllegalArgumentException if <code>hsl</code> has a length lower * than 3 */ private static float[] RGBtoHSL(Color color, float[] hsl) { return RGBtoHSL(color.getRed(), color.getGreen(), color.getBlue(), hsl); } /** * <p>Returns the HSL (Hue/Saturation/Luminance) equivalent of a given * RGB color. All three HSL components are between 0.0 and 1.0.</p> * * Copyright 2005 Sun Microsystems, Inc., 4150 Network Circle, * Santa Clara, California 95054, U.S.A. All rights reserved. * * Copyright (c) 2006 Romain Guy <romain.guy@mac.com> * All rights reserved. * * @param r the red component, between 0 and 255 * @param g the green component, between 0 and 255 * @param b the blue component, between 0 and 255 * @return a new array of 3 floats corresponding to the HSL components */ private static float[] RGBtoHSL(int r, int g, int b) { return RGBtoHSL(r, g, b, null); } /** * <p>Returns the HSL (Hue/Saturation/Luminance) equivalent of a given * RGB color. All three HSL components are floats between 0.0 and 1.0.</p> * * Copyright 2005 Sun Microsystems, Inc., 4150 Network Circle, * Santa Clara, California 95054, U.S.A. All rights reserved. * * Copyright (c) 2006 Romain Guy <romain.guy@mac.com> * All rights reserved. * * @param r the red component, between 0 and 255 * @param g the green component, between 0 and 255 * @param b the blue component, between 0 and 255 * @param hsl a pre-allocated array of floats; can be null * @return <code>hsl</code> if non-null, a new array of 3 floats otherwise * @throws IllegalArgumentException if <code>hsl</code> has a length lower * than 3 */ private static float[] RGBtoHSL(int r, int g, int b, float[] hsl) { if (hsl == null) { hsl = new float[3]; } else if (hsl.length < 3) { throw new IllegalArgumentException("hsl array must have a length of" + " at least 3"); } if (r < 0) r = 0; else if (r > 255) r = 255; if (g < 0) g = 0; else if (g > 255) g = 255; if (b < 0) b = 0; else if (b > 255) b = 255; float var_R = (r / 255f); float var_G = (g / 255f); float var_B = (b / 255f); float var_Min; float var_Max; float del_Max; if (var_R > var_G) { var_Min = var_G; var_Max = var_R; } else { var_Min = var_R; var_Max = var_G; } if (var_B > var_Max) { var_Max = var_B; } if (var_B < var_Min) { var_Min = var_B; } del_Max = var_Max - var_Min; float H, S, L; L = (var_Max + var_Min) / 2f; if (del_Max - 0.01f <= 0.0f) { H = 0; S = 0; } else { if (L < 0.5f) { S = del_Max / (var_Max + var_Min); } else { S = del_Max / (2 - var_Max - var_Min); } float del_R = (((var_Max - var_R) / 6f) + (del_Max / 2f)) / del_Max; float del_G = (((var_Max - var_G) / 6f) + (del_Max / 2f)) / del_Max; float del_B = (((var_Max - var_B) / 6f) + (del_Max / 2f)) / del_Max; if (var_R == var_Max) { H = del_B - del_G; } else if (var_G == var_Max) { H = (1 / 3f) + del_R - del_B; } else { H = (2 / 3f) + del_G - del_R; } if (H < 0) { H += 1; } if (H > 1) { H -= 1; } } hsl[0] = H; hsl[1] = S; hsl[2] = L; return hsl; } /** * <p>Returns the RGB equivalent of a given HSL (Hue/Saturation/Luminance) * color.</p> * * Copyright 2005 Sun Microsystems, Inc., 4150 Network Circle, * Santa Clara, California 95054, U.S.A. All rights reserved. * * Copyright (c) 2006 Romain Guy <romain.guy@mac.com> * All rights reserved. * * @param h the hue component, between 0.0 and 1.0 * @param s the saturation component, between 0.0 and 1.0 * @param l the luminance component, between 0.0 and 1.0 * @return a new <code>Color</code> object equivalent to the HSL components */ private static Color HSLtoRGB(float h, float s, float l) { int[] rgb = HSLtoRGB(h, s, l, null); return new Color(rgb[0], rgb[1], rgb[2]); } /** * <p>Returns the RGB equivalent of a given HSL (Hue/Saturation/Luminance) * color. All three RGB components are integers between 0 and 255.</p> * * Copyright 2005 Sun Microsystems, Inc., 4150 Network Circle, * Santa Clara, California 95054, U.S.A. All rights reserved. * * Copyright (c) 2006 Romain Guy <romain.guy@mac.com> * All rights reserved. * * @param h the hue component, between 0.0 and 1.0 * @param s the saturation component, between 0.0 and 1.0 * @param l the luminance component, between 0.0 and 1.0 * @param rgb a pre-allocated array of ints; can be null * @return <code>rgb</code> if non-null, a new array of 3 ints otherwise * @throws IllegalArgumentException if <code>rgb</code> has a length lower * than 3 */ private static int[] HSLtoRGB(float h, float s, float l, int[] rgb) { if (rgb == null) { rgb = new int[3]; } else if (rgb.length < 3) { throw new IllegalArgumentException("rgb array must have a length of" + " at least 3"); } if (h < 0) h = 0.0f; else if (h > 1.0f) h = 1.0f; if (s < 0) s = 0.0f; else if (s > 1.0f) s = 1.0f; if (l < 0) l = 0.0f; else if (l > 1.0f) l = 1.0f; int R, G, B; if (s - 0.01f <= 0.0f) { R = (int) (l * 255.0f); G = (int) (l * 255.0f); B = (int) (l * 255.0f); } else { float var_1, var_2; if (l < 0.5f) { var_2 = l * (1 + s); } else { var_2 = (l + s) - (s * l); } var_1 = 2 * l - var_2; R = (int) (255.0f * hue2RGB(var_1, var_2, h + (1.0f / 3.0f))); G = (int) (255.0f * hue2RGB(var_1, var_2, h)); B = (int) (255.0f * hue2RGB(var_1, var_2, h - (1.0f / 3.0f))); } rgb[0] = R; rgb[1] = G; rgb[2] = B; return rgb; } /** * Copyright 2005 Sun Microsystems, Inc., 4150 Network Circle, * Santa Clara, California 95054, U.S.A. All rights reserved. * * Copyright (c) 2006 Romain Guy <romain.guy@mac.com> * All rights reserved. */ private static float hue2RGB(float v1, float v2, float vH) { if (vH < 0.0f) { vH += 1.0f; } if (vH > 1.0f) { vH -= 1.0f; } if ((6.0f * vH) < 1.0f) { return (v1 + (v2 - v1) * 6.0f * vH); } if ((2.0f * vH) < 1.0f) { return (v2); } if ((3.0f * vH) < 2.0f) { return (v1 + (v2 - v1) * ((2.0f / 3.0f) - vH) * 6.0f); } return (v1); } }