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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Qt Tutorial - t10/cannon.cpp</title></head><body bgcolor="#ffffff"><p><table width="100%"><tr><td><a href="index.html"><img width="100" height="100" src="qtlogo.png"alt="Home" border="0"><img width="100"height="100" src="face.png" alt="Home" border="0"></a><td valign="top"><div align="right"><img src="dochead.png" width="472" height="27"><br><a href="classes.html"><b>Classes</b></a>- <a href="annotated.html">Annotated</a>- <a href="hierarchy.html">Tree</a>- <a href="functions.html">Functions</a>- <a href="index.html">Home</a>- <a href="topicals.html"><b>Structure</b> <font face="Arial,Helvetica,Geneva,Swiss,SunSans-Regular" align="center" size=32>Qte</font></a></div></table><p><h1 align=center>Source code for <a href="t10.html">tutorial 10</a>: cannon.cpp</h1><br clear="all"><hr> <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>>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#d7e4b9">setPalette</a>( <a href="qpalette.html">QPalette</a>( <a href="qcolor.html">QColor</a>( 250, 250, 200) ) );}void <a name="483"></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#7569b1">repaint</a>( cannonRect(), FALSE ); emit angleChanged( ang );}void <a name="484"></a>CannonField::setForce( int newton ){ if ( newton < 0 ) newton = 0; if ( f == newton ) return; f = newton; emit forceChanged( f );}void <a name="485"></a>CannonField::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> *e ){ if ( !e-><a href="qpaintevent.html#2d6e18">rect</a>().intersects( <a href=#486>cannonRect</a>() ) ) return; <a href="qrect.html">QRect</a> cr = cannonRect(); <a href="qpixmap.html">QPixmap</a> pix( cr.<a href="qrect.html#507cd9">size</a>() ); pix.<a href="qpixmap.html#6910a0">fill</a>( this, cr.<a href="qrect.html#349186">topLeft</a>() ); <a href="qpainter.html">QPainter</a> p( &pix ); p.<a href="qpainter.html#3e0cc8">setBrush</a>( blue ); p.<a href="qpainter.html#0183e4">setPen</a>( NoPen ); p.<a href="qpainter.html#eb778c">translate</a>( 0, pix.<a href="qpixmap.html#d5bb33">height</a>() - 1 ); p.<a href="qpainter.html#3ca7a2">drawPie</a>( <a href="qrect.html">QRect</a>( -35,-35, 70, 70 ), 0, 90*16 ); p.<a href="qpainter.html#b5205c">rotate</a>( -ang ); p.<a href="qpainter.html#4c0077">drawRect</a>( <a href="qrect.html">QRect</a>(33, -4, 15, 8) ); p.<a href="qpainter.html#365784">end</a>(); p.<a href="qpainter.html#02ed5d">begin</a>( this ); p.<a href="qpainter.html#c64b89">drawPixmap</a>( cr.<a href="qrect.html#349186">topLeft</a>(), pix );}<a href="qrect.html">QRect</a> <a name="486"></a>CannonField::cannonRect() const{ <a href="qrect.html">QRect</a> r( 0, 0, 50, 50 ); r.<a href="qrect.html#8df149">moveBottomLeft</a>( <a href="qwidget.html#75ae71">rect</a>().bottomLeft() ); return r;}<a href="qsizepolicy.html">QSizePolicy</a> <a name="487"></a>CannonField::sizePolicy() const{ return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );}</pre><p><p><address><hr><div align="center"><table width="100%" cellspacing="0" border="0"><tr><td>Copyright ⌨️ 快捷键说明
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