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# main.cpp Example File
tutorial/t8/main.cpp

        /****************************************************************
        **
        ** Qt tutorial 8
        **
        ****************************************************************/

        #include <QApplication>
        #include <QFont>
        #include <QGridLayout>
        #include <QLCDNumber>
        #include <QPushButton>

        #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("Quit", this);
            quit->setFont(QFont("Times", 18, QFont::Bold));

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

            LCDRange *angle = new LCDRange(this);
            angle->setRange(5, 70);

            CannonField *cannonField = new CannonField(this);

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

            QGridLayout *gridLayout = new QGridLayout(this);
            gridLayout->addWidget(quit, 0, 0);
            gridLayout->addWidget(angle, 1, 0);
            gridLayout->addWidget(cannonField, 1, 1, 2, 1);
            gridLayout->setColumnStretch(1, 10);

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

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