cannonfield.cpp Example File
tutorial/t9/cannonfield.cpp
/****************************************************************
**
** Implementation CannonField class, Qt tutorial 9
**
****************************************************************/
#include <QPainter>
#include "cannonfield.h"
CannonField::CannonField(QWidget *parent)
: QWidget(parent)
{
ang = 45;
setPalette(QPalette(QColor(250, 250, 200)));
}
void CannonField::setAngle(int angle)
{
if (angle < 5)
angle = 5;
if (angle > 70)
angle = 70;
if (ang == angle)
return;
ang = angle;
update();
emit angleChanged(ang);
}
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(-ang);
painter.drawRect(QRect(33, -4, 15, 8));
}