kbruch/src/fractionbasewidget.cpp

   1 /***************************************************************************
   2                           fractionbasewidget.cpp  -  base fraction painting
   3                              -------------------
   4     begin                : 2004/05/30
   5     copyright            : (C) 2004 by Sebastian Stein
   6     email                : seb.kde@hpfsc.de
   7  ***************************************************************************/
   8
   9 /***************************************************************************
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  ***************************************************************************/
  17
  18 #include "fractionbasewidget.h"
  19 #include "fractionbasewidget.moc"
  20
  21 /* these includes are needed for KDE support */
  22 #include <kglobalsettings.h>
  23
  24 /* these includes are needed for Qt support */
  25 #include <qpainter.h>
  26
  27 #include "settingsclass.h"
  28
  29 FractionBaseWidget::FractionBaseWidget(QWidget * parent = 0, const char * name = 0) :
  30                         QWidget(parent, name)
  31 {
  32 #ifdef DEBUG
  33         kdDebug() << "constructor FractionBaseWidget" << endl;
  34 #endif
  35
  36         // set colors and font used for task displaying
  37         setColorAndFont();
  38 }
  39
  40 FractionBaseWidget::~FractionBaseWidget()
  41 {
  42 #ifdef DEBUG
  43         kdDebug() << "destructor FractionBaseWidget" << endl;
  44 #endif
  45 }
  46
  47 void FractionBaseWidget::updateAndRepaint()
  48 {
  49         setColorAndFont();
  50         update();
  51 }
  52
  53 void FractionBaseWidget::paintRatio(QPainter & paint, ratio tmp_ratio, int & x_pos, QFontMetrics & fm, bool show_mixed, bool addMargin)
  54 {
  55         QPen pen = paint.pen(); // get the pen
  56         int fontHeight = fm.lineSpacing(); // get the font height
  57
  58         int int_numerator, int_denominator, int_mixed;
  59         QString str_numerator, str_denominator;
  60         QString str_mixed;
  61
  62         int fontWidth; // to store the width of the last thing painted
  63         int tmp_int;
  64
  65         // check if we have to show the ratio as mixed number
  66         //         11            1
  67         // if yes, -- becomes  2 -
  68         //         5             5
  69         int_numerator = tmp_ratio.numerator();
  70         int_denominator = tmp_ratio.denominator();
  71         if (show_mixed == true && QABS(int_numerator) >= QABS(int_denominator))
  72         {
  73                 // calculate the mixed number
  74                 int_mixed = int(int_numerator / int_denominator);
  75
  76                 // the negative sign is in front of the mixed number
  77                 int_numerator = QABS(int_numerator);
  78                 int_denominator = QABS(int_denominator);
  79
  80                 // we have to reduce the numerator by the mixed number * denominator
  81                 int_numerator = int_numerator % int_denominator;
  82
  83                 // now we can convert the numbers into strings for painting
  84                 str_mixed.setNum(int_mixed);
  85                 str_numerator.setNum(int_numerator);
  86                 str_denominator.setNum(int_denominator);
  87
  88                 // paint the front part of the mixed number
  89                 paintMiddle(paint, str_mixed, x_pos, fm, m_colorNumber);
  90         } else {
  91
  92                 // don't show the ratio as mixed number
  93                 str_numerator.setNum(int_numerator);
  94                 str_denominator.setNum(int_denominator);
  95         } // if (show_mixed == true && QABS(int_numerator) > QABS(int_denominator))
  96
  97         // get the text width of the current ratio
  98         fontWidth = fm.width(str_numerator);
  99         tmp_int = fm.width(str_denominator);
 100         if (tmp_int > fontWidth)
 101                 fontWidth = tmp_int;
 102
 103         // show numerator and denominator in m_colorNumber
 104         pen.setColor(m_colorNumber);
 105         paint.setPen(pen);
 106
 107         // make sure we don't display something like:   0
 108         //                                            7 -
 109         //                                              3
 110         if (! (int_numerator == 0 && show_mixed == true) )
 111         {
 112                 // paint the numerator
 113                 paint.drawText(x_pos, 0, fontWidth, fontHeight, AlignCenter, str_numerator);
 114
 115                 // paint the fraction line between numerator and denominator
 116                 paint.fillRect(x_pos, fontHeight + 4, fontWidth, 2, m_colorLine);
 117
 118                 // paint the denominator
 119                 paint.drawText(x_pos, fontHeight + 10, fontWidth, fontHeight, AlignCenter, str_denominator);
 120
 121                 // move the x position to the right by adding the width used for painting
 122                 // the ratio and a margin
 123                 x_pos += fontWidth;
 124
 125                 if (addMargin == true)
 126                         x_pos += _MARGIN_X;
 127         }
 128
 129         return;
 130 }
 131
 132 void FractionBaseWidget::paintMiddle(QPainter & paint, const QString& paint_str, int & x_pos, QFontMetrics & fm, QColor color, bool addMargin)
 133 {
 134         // get the pen, font height and font width
 135         QPen pen = paint.pen();
 136         int fontHeight = fm.lineSpacing();
 137         int fontWidth = fm.width(paint_str);
 138
 139         // paint the string
 140         pen.setColor(color);
 141         paint.setPen(pen);
 142         paint.drawText(x_pos, fontHeight + 5 - fontHeight / 2, fontWidth, fontHeight, AlignCenter, paint_str);
 143
 144         // move the x position to the right by adding the width used for
 145         // painting the string and a margin
 146         x_pos += fontWidth;
 147
 148         if (addMargin == true)
 149                 x_pos += _MARGIN_X;
 150
 151         return;
 152 }
 153
 154 void FractionBaseWidget::setColorAndFont()
 155 {
 156         /* set colors */
 157         m_colorNumber = SettingsClass::numberColor();
 158         m_colorLine = SettingsClass::fractionBarColor();
 159         m_colorOperation = SettingsClass::operationColor();
 160
 161         /* set font */
 162         m_font = SettingsClass::taskFont();
 163
 164         // repaint
 165         update();
 166
 167         return;
 168 }