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

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     #include <QPainter>

     #include "cannonfield.h"

     CannonField::CannonField(QWidget *parent)
         : QWidget(parent)
     {
         currentAngle = 45;
         setPalette(QPalette(QColor(250, 250, 200)));
         setAutoFillBackground(true);
     }

     void CannonField::setAngle(int angle)
     {
         if (angle < 5)
             angle = 5;
         if (angle > 70)
             angle = 70;
         if (currentAngle == angle)
             return;
         currentAngle = angle;
         update();
         emit angleChanged(currentAngle);
     }

     void CannonField::paintEvent(QPaintEvent * /* event */)
     {
         QPainter painter(this);
         painter.drawText(200, 200,
                          tr("Angle = ") + QString::number(currentAngle));
     }