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<pre>/****************************************************************
**
** Implementation CannonField class, Qt tutorial 10
**
****************************************************************/
#include "cannon.h"
#include <<a href="qpainter-h.html">qpainter.h</a>>
#include <<a href="qpixmap-h.html">qpixmap.h</a>>
<a name="f48"></a>CannonField::CannonField( <a href="qwidget.html">QWidget</a> *parent, const char *name )
: <a href="qwidget.html">QWidget</a>( parent, name )
{
ang = 45;
f = 0;
<a href="qwidget.html#setPalette">setPalette</a>( QPalette( QColor( 250, 250, 200) ) );
}
void <a name="f49"></a>CannonField::setAngle( int degrees )
{
if ( degrees < 5 )
degrees = 5;
if ( degrees > 70 )
degrees = 70;
if ( ang == degrees )
return;
ang = degrees;
<a href="qwidget.html#repaint">repaint</a>( cannonRect(), FALSE );
emit angleChanged( ang );
}
void <a name="f50"></a>CannonField::setForce( int newton )
{
if ( newton < 0 )
newton = 0;
if ( f == newton )
return;
f = newton;
emit forceChanged( f );
}
void CannonField::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> *e )
{
if ( !e-><a href="qpaintevent.html#rect">rect</a>().intersects( cannonRect() ) )
return;
<a href="qrect.html">QRect</a> cr = cannonRect();
<a href="qpixmap.html">QPixmap</a> pix( cr.<a href="qrect.html#size">size</a>() );
pix.<a href="qpixmap.html#fill">fill</a>( this, cr.<a href="qrect.html#topLeft">topLeft</a>() );
<a href="qpainter.html">QPainter</a> p( &pix );
p.<a href="qpainter.html#setBrush">setBrush</a>( blue );
p.<a href="qpainter.html#setPen">setPen</a>( NoPen );
p.<a href="qpainter.html#translate">translate</a>( 0, pix.<a href="qpixmap.html#height">height</a>() - 1 );
p.<a href="qpainter.html#drawPie">drawPie</a>( QRect( -35,-35, 70, 70 ), 0, 90*16 );
p.<a href="qpainter.html#rotate">rotate</a>( -ang );
p.<a href="qpainter.html#drawRect">drawRect</a>( QRect(33, -4, 15, 8) );
p.<a href="qpainter.html#end">end</a>();
p.<a href="qpainter.html#begin">begin</a>( this );
p.<a href="qpainter.html#drawPixmap">drawPixmap</a>( cr.<a href="qrect.html#topLeft">topLeft</a>(), pix );
}
QRect <a name="f51"></a>CannonField::cannonRect() const
{
<a href="qrect.html">QRect</a> r( 0, 0, 50, 50 );
r.<a href="qrect.html#moveBottomLeft">moveBottomLeft</a>( <a href="qwidget.html#rect">rect</a>().bottomLeft() );
return r;
}
QSizePolicy CannonField::<a href="qwidget.html#sizePolicy">sizePolicy</a>() const
{
return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
}
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