kig/misc/screeninfo.cc

   1 // Copyright (C)  2002  Dominique Devriese <devriese@kde.org>
   2
   3 // This program is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU General Public License
   5 // as published by the Free Software Foundation; either version 2
   6 // of the License, or (at your option) any later version.
   7
   8 // This program is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 // GNU General Public License for more details.
  12
  13 // You should have received a copy of the GNU General Public License
  14 // along with this program; if not, write to the Free Software
  15 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  16 // 02111-1307, USA.
  17
  18 #include "screeninfo.h"
  19
  20 #include <cmath>
  21
  22 ScreenInfo::ScreenInfo( const Rect& docRect, const QRect& viewRect )
  23   : mkrect( docRect.normalized() ), mqrect( viewRect.normalize() )
  24 {
  25 }
  26
  27 Rect ScreenInfo::fromScreen( const QRect& r ) const
  28 {
  29   return Rect(
  30     fromScreen( r.topLeft() ),
  31     fromScreen( r.bottomRight() )
  32     ).normalized();
  33 }
  34
  35 Coordinate ScreenInfo::fromScreen( const QPoint& p ) const
  36 {
  37   // invert the y-axis: 0 is at the bottom !
  38   Coordinate t( p.x(), mqrect.height() - p.y() );
  39   t *= mkrect.width();
  40   t /= mqrect.width();
  41   return t + mkrect.bottomLeft();
  42 }
  43
  44 QPoint ScreenInfo::toScreen( const Coordinate& p ) const
  45 {
  46   Coordinate t = p - mkrect.bottomLeft();
  47   t *= mqrect.width();
  48   t /= mkrect.width();
  49   // invert the y-axis: 0 is at the bottom !
  50   return QPoint( (int) t.x, mqrect.height() - (int) t.y );
  51 }
  52
  53 QRect ScreenInfo::toScreen( const Rect& r ) const
  54 {
  55   return QRect(
  56     toScreen( r.bottomLeft() ),
  57     toScreen( r.topRight() )
  58     ).normalize();
  59 }
  60
  61 double ScreenInfo::pixelWidth() const
  62 {
  63   Coordinate a = fromScreen( QPoint( 0, 0 ) );
  64   Coordinate b = fromScreen( QPoint( 0, 1000 ) );
  65   return std::fabs( b.y - a.y ) / 1000;
  66 }
  67
  68 const Rect& ScreenInfo::shownRect() const
  69 {
  70   return mkrect;
  71 }
  72
  73 void ScreenInfo::setShownRect( const Rect& r )
  74 {
  75   mkrect = r;
  76 }
  77
  78 const QRect ScreenInfo::viewRect() const
  79 {
  80   return mqrect;
  81 }
  82
  83 void ScreenInfo::setViewRect( const QRect& r )
  84 {
  85   mqrect = r;
  86 }
  87
  88 double ScreenInfo::normalMiss( int width ) const
  89 {
  90   int twidth = width == -1 ? 1 : width;
  91   return (twidth+2)*pixelWidth();
  92 }