/*
* Copyright (C) 2004, 2005, 2006 Aelitis, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program 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 for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*/
package org.gudy.azureus2.ui.swt.mainwindow;
public class HSLColor {
private final static int HSLMAX = 255;
private final static int RGBMAX = 255;
private final static int UNDEFINED = 170;
private int pHue;
private int pSat;
private int pLum;
private int pRed;
private int pGreen;
private int pBlue;
public void initHSLbyRGB(int R, int G, int B) {
// sets Hue, Sat, Lum
int cMax;
int cMin;
int RDelta;
int GDelta;
int BDelta;
int cMinus;
int cPlus;
pRed = R;
pGreen = G;
pBlue = B;
//Set Max & MinColor Values
cMax = iMax(iMax(R, G), B);
cMin = iMin(iMin(R, G), B);
cMinus = cMax - cMin;
cPlus = cMax + cMin;
// Calculate luminescence (lightness)
pLum = ((cPlus * HSLMAX) + RGBMAX) / (2 * RGBMAX);
if (cMax == cMin) {
// greyscale
pSat = 0;
pHue = UNDEFINED;
} else {
// Calculate color saturation
if (pLum <= (HSLMAX / 2)) {
pSat = (int)(((cMinus * HSLMAX) + 0.5) / cPlus);
} else {
pSat = (int)(((cMinus * HSLMAX) + 0.5) / (2 * RGBMAX - cPlus));
}
//Calculate hue
RDelta = (int)((((cMax - R) * (HSLMAX / 6)) + 0.5) / cMinus);
GDelta = (int)((((cMax - G) * (HSLMAX / 6)) + 0.5) / cMinus);
BDelta = (int)((((cMax - B) * (HSLMAX / 6)) + 0.5) / cMinus);
if (cMax == R) {
pHue = BDelta - GDelta;
} else if (cMax == G) {
pHue = (HSLMAX / 3) + RDelta - BDelta;
} else if (cMax == B) {
pHue = ((2 * HSLMAX) / 3) + GDelta - RDelta;
}
if (pHue < 0) {
pHue = pHue + HSLMAX;
}
}
}
public void initRGBbyHSL(int H, int S, int L) {
int Magic1;
int Magic2;
pHue = H;
pLum = L;
pSat = S;
if (S == 0) { //Greyscale
pRed = (L * RGBMAX) / HSLMAX; //luminescence: set to range
pGreen = pRed;
pBlue = pRed;
} else {
if (L <= HSLMAX / 2) {
Magic2 = (L * (HSLMAX + S) + (HSLMAX / 2)) / (HSLMAX);
} else {
Magic2 = L + S - ((L * S) + (HSLMAX / 2)) / HSLMAX;
}
Magic1 = 2 * L - Magic2;
//get R, G, B; change units from HSLMAX range to RGBMAX range
pRed = (hueToRGB(Magic1, Magic2, H + (HSLMAX / 3)) * RGBMAX + (HSLMAX / 2)) / HSLMAX;
if (pRed > RGBMAX) {
pRed = RGBMAX;
}
pGreen = (hueToRGB(Magic1, Magic2, H) * RGBMAX + (HSLMAX / 2)) / HSLMAX;
if (pGreen > RGBMAX) {
pGreen = RGBMAX;
}
pBlue = (hueToRGB(Magic1, Magic2, H - (HSLMAX / 3)) * RGBMAX + (HSLMAX / 2)) / HSLMAX;
if (pBlue > RGBMAX) {
pBlue = RGBMAX;
}
}
}
private int hueToRGB(int mag1, int mag2, int Hue) {
// check the range
if (Hue < 0) {
Hue = Hue + HSLMAX;
} else if (Hue > HSLMAX) {
Hue = Hue - HSLMAX;
}
if (Hue < (HSLMAX / 6))
return (mag1 + (((mag2 - mag1) * Hue + (HSLMAX / 12)) / (HSLMAX / 6)));
if (Hue < (HSLMAX / 2))
return mag2;
if (Hue < (HSLMAX * 2 / 3))
return (mag1 + (((mag2 - mag1) * ((HSLMAX * 2 / 3) - Hue) + (HSLMAX / 12)) / (HSLMAX / 6)));
return mag1;
}
private int iMax(int a, int b) {
if (a > b) return a; else return b;
}
private int iMin(int a, int b) {
if (a < b) return a; else return b;
}
public void greyscale() {
initRGBbyHSL(UNDEFINED, 0, pLum);
}
// --
public int getHue() {
return pHue;
}
public void setHue(int iToValue) {
while (iToValue < 0) {
iToValue = HSLMAX + iToValue;
}
while (iToValue > HSLMAX) {
iToValue = iToValue - HSLMAX;
}
initRGBbyHSL(iToValue, pSat, pLum);
}
// --
public int getSaturation() {
return pSat;
}
public void setSaturation(int iToValue) {
if (iToValue < 0) {
iToValue = 0;
} else if (iToValue > HSLMAX) {
iToValue = HSLMAX;
}
initRGBbyHSL(pHue, iToValue, pLum);
}
// --
public int getLuminence() {
return pLum;
}
public void setLuminence(int iToValue) {
if (iToValue < 0) {
iToValue = 0;
} else if (iToValue > HSLMAX) {
iToValue = HSLMAX;
}
initRGBbyHSL(pHue, pSat, iToValue);
}
// --
public int getRed() {
return pRed;
}
public void setRed(int iNewValue) {
initHSLbyRGB(iNewValue, pGreen, pBlue);
}
// --
public int getGreen() {
return pGreen;
}
public void setGreen(int iNewValue) {
initHSLbyRGB(pRed, iNewValue, pBlue);
}
// --
public int getBlue() {
return pBlue;
}
public void setBlue(int iNewValue) {
initHSLbyRGB(pRed, pGreen, iNewValue);
}
// --
public void reverseColor() {
setHue(pHue + (HSLMAX / 2));
}
// --
public void reverseLight() {
setLuminence(HSLMAX - pLum);
}
// --
public void brighten(float fPercent) {
int L;
if (fPercent == 0) {
return;
}
L = (int)(pLum * fPercent);
if (L < 0) L = 0;
if (L > HSLMAX) L = HSLMAX;
setLuminence(L);
}
// --
// --
public void blend(int R, int G, int B, float fPercent) {
if (fPercent >= 1) {
initHSLbyRGB(R, G, B);
return;
}
if (fPercent <= 0)
return;
int newR = (int)((R * fPercent) + (pRed * (1.0 - fPercent)));
int newG = (int)((G * fPercent) + (pGreen * (1.0 - fPercent)));
int newB = (int)((B * fPercent) + (pBlue * (1.0 - fPercent)));
initHSLbyRGB(newR, newG, newB);
}
}
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