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

        /****************************************************************
        **
        ** Qt tutorial 12
        **
        ****************************************************************/

        #include <QApplication>
        #include <QFont>
        #include <QGridLayout>
        #include <QHBoxLayout>
        #include <QLCDNumber>
        #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("&Quit", this);
            quit->setFont(QFont("Times", 18, QFont::Bold));

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

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

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

            CannonField *cannonField = new CannonField(this);

            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("&Shoot", this);
            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(this);
            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);

            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);
            app.setMainWidget(&widget);
            widget.show();
            return app.exec();
        }