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** this package.
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#include <QtGui>
#include "window.h"

Window::Window(QWidget *parent)
    : QWidget(parent)
{
    QFont font;
    font.setPixelSize(12);
    setFont(font);
}

void Window::closeEvent(QCloseEvent *event)
{
    QPixmap pixmap(size());
    render(&pixmap);
    pixmap.save("qt-colors.png");

    event->accept();
}

void Window::paintEvent(QPaintEvent *)
{
    QPainter painter;
    painter.begin(this);

    int h = 216 / 5;
    QRect r = QRect(0, 0, 160, h);
    painter.fillRect(r, Qt::white);
    painter.setPen(Qt::black);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("white"));
    r = QRect(0, h, 160, h);
    painter.fillRect(r, Qt::red);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("red"));
    r = QRect(0, h*2, 160, h);
    painter.fillRect(r, Qt::green);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("green"));
    r = QRect(0, h*3, 160, h);
    painter.fillRect(r, Qt::blue);
    painter.setPen(Qt::white);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("blue"));

    r = QRect(160, 0, 160, h);
    painter.fillRect(r, Qt::black);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("black"));
    r = QRect(160, h, 160, h);
    painter.fillRect(r, Qt::darkRed);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("darkRed"));
    r = QRect(160, h*2, 160, h);
    painter.fillRect(r, Qt::darkGreen);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("darkGreen"));
    r = QRect(160, h*3, 160, h);
    painter.fillRect(r, Qt::darkBlue);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("darkBlue"));

    r = QRect(320, 0, 160, h);
    painter.fillRect(r, Qt::cyan);
    painter.setPen(Qt::black);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("cyan"));
    r = QRect(320, h, 160, h);
    painter.fillRect(r, Qt::magenta);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("magenta"));
    r = QRect(320, h*2, 160, h);
    painter.fillRect(r, Qt::yellow);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("yellow"));
    r = QRect(320, h*3, 160, h);
    painter.fillRect(r, Qt::gray);
    painter.setPen(Qt::white);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("gray"));

    r = QRect(480, 0, 160, h);
    painter.fillRect(r, Qt::darkCyan);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("darkCyan"));
    r = QRect(480, h, 160, h);
    painter.fillRect(r, Qt::darkMagenta);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("darkMagenta"));
    r = QRect(480, h*2, 160, h);
    painter.fillRect(r, Qt::darkYellow);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("darkYellow"));
    r = QRect(480, h*3, 160, h);
    painter.fillRect(r, Qt::darkGray);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("darkGray"));

    r = QRect(0, h*4, 640, h);
    painter.fillRect(r, Qt::lightGray);
    painter.setPen(Qt::black);
    painter.drawText(r, Qt::AlignCenter, QLatin1String("lightGray"));

    painter.end();
}