runtime/kstyles/keramik/colorutil.cpp

   1 /* Keramik Style for KDE3, color utility routines..
   2    Copyright (c) 2002 Malte Starostik <malte@kde.org>
   3                   (c) 2002 Maksim Orlovich <mo002j@mail.rochester.edu>
   4
   5    This library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public
   7    License as published by the Free Software Foundation; either
   8    version 2 of the License, or (at your option) any later version.
   9
  10    This library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public License
  16    along with this library; see the file COPYING.LIB.  If not, write to
  17    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18    Boston, MA 02110-1301, USA.
  19 */
  20
  21 #include "colorutil.h"
  22
  23 #include <QtGui/QColor>
  24
  25 namespace Keramik
  26 {
  27         QColor ColorUtil::lighten(const QColor& in, int factor)
  28         {
  29                 if (factor > 100)
  30                 {
  31                         int h, s, v;
  32                         in.getHsv(&h, &s, &v);
  33
  34                         float mShare = v/230.0;
  35                         if (mShare > 1) mShare = 1;
  36
  37                         mShare *= mShare;
  38
  39                         int diff = factor - 100;
  40                         int hd  = int(mShare*diff);
  41                         int delta  =  int((diff - hd)*7.55);
  42
  43                         QColor wrk = in.light(100+hd);
  44
  45                         int r = wrk.red();
  46                         int g = wrk.green();
  47                         int b = wrk.blue();
  48
  49                         r+=delta;
  50                         g+=delta;
  51                         b+=delta;
  52
  53                         if (r>255) r=255;
  54                         if (g>255) g=255;
  55                         if (b>255) b=255;
  56
  57                         return QColor(r,g,b);
  58                 }
  59
  60                 return in;
  61         }
  62 }
  63
  64 // vim: ts=4 sw=4 noet