Qt:Документация 4.3.2/tutorial-t9-cannonfield-cpp

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cannonfield.cpp Example File
tutorial/t9/cannonfield.cpp

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 ** This file is part of the example classes of the Qt Toolkit.
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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.setPen(Qt::NoPen);
     painter.setBrush(Qt::blue);
 
     painter.translate(0, rect().height());
     painter.drawPie(QRect(-35, -35, 70, 70), 0, 90 * 16);
     painter.rotate(-currentAngle);
     painter.drawRect(QRect(30, -5, 20, 10));
 }

Copyright © 2007 Trolltech Trademarks
Qt 4.3.2