t10-cannon-cpp.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/doc/tutorial.doc:1301 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>t10/cannon.cpp Example File</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td valign=center> <a href="index.html"><font color="#004faf">Home</font></a> | <a href="classes.html"><font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> | <a href="annotated.html"><font color="#004faf">Annotated</font></a> | <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"><font color="#004faf">Functions</font></a></td><td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>t10/cannon.cpp Example File</h1> <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 );}</pre><!-- eof --><p><address><hr><div align=center><table width=100% cellspacing=0 border=0><tr><td>Copyright © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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