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# cannonfield.cpp Example File
tutorial/t10/cannonfield.cpp

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     #include <QPaintEvent>
     #include <QPainter>

     #include "cannonfield.h"

     CannonField::CannonField(QWidget *parent)
         : QWidget(parent)
     {
         currentAngle = 45;
         currentForce = 0;
         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(cannonRect());
         emit angleChanged(currentAngle);
     }

     void CannonField::setForce(int force)
     {
         if (force < 0)
             force = 0;
         if (currentForce == force)
             return;
         currentForce = force;
         emit forceChanged(currentForce);
     }

     void CannonField::paintEvent(QPaintEvent * /* event */)
     {
         QPainter painter(this);

         painter.setPen(Qt::NoPen);
         painter.setBrush(Qt::blue);

         painter.translate(0, height());
         painter.drawPie(QRect(-35, -35, 70, 70), 0, 90 * 16);
         painter.rotate(-currentAngle);
         painter.drawRect(QRect(30, -5, 20, 10));
     }

     QRect CannonField::cannonRect() const
     {
         QRect result(0, 0, 50, 50);
         result.moveBottomLeft(rect().bottomLeft());
         return result;
     }