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FractionPainter.cpp

/***************************************************************************
                              FractionPainter.cpp
                             -------------------
    begin                : 2008/09/18
    copyright            : (C) 2008 by Danilo Balzaque
    email                : danilo.balzaque@ltia.fc.unesp.br

    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo@ltia.fc.unesp.br
    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba@ltia.fc.unesp.br
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/
#include "FractionPainter.h"
#include "FractionPainter.moc"

/* these includes are needed for KDE support */
#include <klocale.h>

/* these includes are needed for Qt support */
#include <qpainter.h>
//Added by qt3to4:
#include <QPaintEvent>

00031 FractionPainter::FractionPainter (QWidget * parent = 0) :
    FractionBaseWidget (parent)
{
#ifdef DEBUG
    kDebug() << "constructor FractionPainter";
#endif
}

00039 FractionPainter::~FractionPainter()
{
#ifdef DEBUG
    kDebug() << "destructor FractionPainter";
#endif
}

00046 void FractionPainter::paintEvent (QPaintEvent *)
{
    QPainter paint (this);
    paintWidget (paint);
}

void FractionPainter::paintFraction (const QString & op, ratio & lr, int lm,
                                     ratio & rr, int rm)
{
    str_operation = op;
    leftRatio = lr;
    leftMult = lm;
    rightRatio = rr;
    rightMult = rm;

    update();
}

void FractionPainter::paintWidget (QPainter & paint)
{
    // our x position, we paint from left to right;
    // we don't want to start directly on the border, so add the margin
    int old_x = _MARGIN_X;
    int old_y = 0;

    // ratios and operation signs are painted with the same font
    m_font.setPointSize (24);
    m_font.setBold (true);
    paint.setFont (m_font);

    // set the pen for painting
    QPen pen (Qt::SolidLine);
    pen.setWidth (0);
    paint.setPen (pen);

    // get the font height; the font height doesn't change while painting
    QFontMetrics  fm (paint.fontMetrics());

    // now we can correctly set the height of the widget
    setMinimumHeight (2 * fm.lineSpacing() + 10);
    setMaximumHeight (2 * fm.lineSpacing() + 10);

    // get the current ratio and paint it
    paintRatio (paint, ratio (leftRatio.numerator() * leftMult, leftRatio.denominator() * leftMult, false), old_x, old_y, fm);

    if (leftRatio.denominator() * leftMult < 10)
        old_x += 40;
    else
        old_x += 25;

    // paint the operation
    paintMiddle (paint, str_operation, old_x, old_y, fm, m_colorOperation);

    if (rightRatio.denominator() * rightMult < 10)
        old_x += 40;
    else
        old_x += 25;

    // get the current ratio and paint it
    paintRatio (paint, ratio (rightRatio.numerator() * rightMult, rightRatio.denominator() * rightMult, false), old_x, old_y, fm);

    // stop the painter
    paint.end();

    // the space we needed for painting is the minimum width of the widget
    setMinimumWidth (old_x);
}

/* ------ public slots ------ */

void FractionPainter::update()
{
    updateAndRepaint();

    // update for itself
    ( (QWidget *) this)->update();
}

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