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# main.cpp Example File
tutorial/t12/main.cpp

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     #include <QApplication>
     #include <QFont>
     #include <QGridLayout>
     #include <QHBoxLayout>
     #include <QPushButton>
     #include <QVBoxLayout>

     #include "cannonfield.h"
     #include "lcdrange.h"

     class MyWidget : public QWidget
     {
     public:
         MyWidget(QWidget *parent = 0);
     };

     MyWidget::MyWidget(QWidget *parent)
         : QWidget(parent)
     {
         QPushButton *quit = new QPushButton(tr("&Quit"));
         quit->setFont(QFont("Times", 18, QFont::Bold));

         connect(quit, SIGNAL(clicked()), qApp, SLOT(quit()));

         LCDRange *angle = new LCDRange(tr("ANGLE"));
         angle->setRange(5, 70);

         LCDRange *force = new LCDRange(tr("FORCE"));
         force->setRange(10, 50);

         CannonField *cannonField = new CannonField;

         connect(angle, SIGNAL(valueChanged(int)),
                 cannonField, SLOT(setAngle(int)));
         connect(cannonField, SIGNAL(angleChanged(int)),
                 angle, SLOT(setValue(int)));

         connect(force, SIGNAL(valueChanged(int)),
                 cannonField, SLOT(setForce(int)));
         connect(cannonField, SIGNAL(forceChanged(int)),
                 force, SLOT(setValue(int)));

         QPushButton *shoot = new QPushButton(tr("&Shoot"));
         shoot->setFont(QFont("Times", 18, QFont::Bold));

         connect(shoot, SIGNAL(clicked()), cannonField, SLOT(shoot()));

         QHBoxLayout *topLayout = new QHBoxLayout;
         topLayout->addWidget(shoot);
         topLayout->addStretch(1);

         QVBoxLayout *leftLayout = new QVBoxLayout;
         leftLayout->addWidget(angle);
         leftLayout->addWidget(force);

         QGridLayout *gridLayout = new QGridLayout;
         gridLayout->addWidget(quit, 0, 0);
         gridLayout->addLayout(topLayout, 0, 1);
         gridLayout->addLayout(leftLayout, 1, 0);
         gridLayout->addWidget(cannonField, 1, 1, 2, 1);
         gridLayout->setColumnStretch(1, 10);
         setLayout(gridLayout);

         angle->setValue(60);
         force->setValue(25);
         angle->setFocus();
     }

     int main(int argc, char *argv[])
     {
         QApplication app(argc, argv);
         MyWidget widget;
         widget.setGeometry(100, 100, 500, 355);
         widget.show();
         return app.exec();
     }