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| 31 | </td>
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| 32 | <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>
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| 33 |
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| 34 |
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| 35 | <pre>/****************************************************************
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| 36 | **
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| 37 | ** Implementation CannonField class, Qt tutorial 10
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| 38 | **
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| 39 | ****************************************************************/
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| 40 |
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| 41 | #include "cannon.h"
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| 42 | #include <<a href="qpainter-h.html">qpainter.h</a>>
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| 43 | #include <<a href="qpixmap-h.html">qpixmap.h</a>>
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| 44 |
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| 45 |
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| 46 | <a name="f48"></a>CannonField::CannonField( <a href="qwidget.html">QWidget</a> *parent, const char *name )
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| 47 | : <a href="qwidget.html">QWidget</a>( parent, name )
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| 48 | {
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| 49 | ang = 45;
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| 50 | f = 0;
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| 51 | <a href="qwidget.html#setPalette">setPalette</a>( QPalette( QColor( 250, 250, 200) ) );
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| 52 | }
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| 53 |
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| 54 |
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| 55 | void <a name="f49"></a>CannonField::setAngle( int degrees )
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| 56 | {
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| 57 | if ( degrees < 5 )
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| 58 | degrees = 5;
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| 59 | if ( degrees > 70 )
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| 60 | degrees = 70;
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| 61 | if ( ang == degrees )
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| 62 | return;
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| 63 | ang = degrees;
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| 64 | <a href="qwidget.html#repaint">repaint</a>( cannonRect(), FALSE );
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| 65 | emit angleChanged( ang );
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| 66 | }
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| 67 |
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| 68 |
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| 69 | void <a name="f50"></a>CannonField::setForce( int newton )
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| 70 | {
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| 71 | if ( newton < 0 )
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| 72 | newton = 0;
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| 73 | if ( f == newton )
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| 74 | return;
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| 75 | f = newton;
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| 76 | emit forceChanged( f );
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| 77 | }
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| 78 |
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| 79 |
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| 80 | void CannonField::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> *e )
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| 81 | {
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| 82 | if ( !e-><a href="qpaintevent.html#rect">rect</a>().intersects( cannonRect() ) )
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| 83 | return;
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| 84 |
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| 85 | <a href="qrect.html">QRect</a> cr = cannonRect();
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| 86 | <a href="qpixmap.html">QPixmap</a> pix( cr.<a href="qrect.html#size">size</a>() );
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| 87 | pix.<a href="qpixmap.html#fill">fill</a>( this, cr.<a href="qrect.html#topLeft">topLeft</a>() );
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| 88 |
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| 89 | <a href="qpainter.html">QPainter</a> p( &pix );
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| 90 | p.<a href="qpainter.html#setBrush">setBrush</a>( blue );
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| 91 | p.<a href="qpainter.html#setPen">setPen</a>( NoPen );
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| 92 | p.<a href="qpainter.html#translate">translate</a>( 0, pix.<a href="qpixmap.html#height">height</a>() - 1 );
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| 93 | p.<a href="qpainter.html#drawPie">drawPie</a>( QRect( -35,-35, 70, 70 ), 0, 90*16 );
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| 94 | p.<a href="qpainter.html#rotate">rotate</a>( -ang );
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| 95 | p.<a href="qpainter.html#drawRect">drawRect</a>( QRect(33, -4, 15, 8) );
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| 96 | p.<a href="qpainter.html#end">end</a>();
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| 97 |
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| 98 | p.<a href="qpainter.html#begin">begin</a>( this );
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| 99 | p.<a href="qpainter.html#drawPixmap">drawPixmap</a>( cr.<a href="qrect.html#topLeft">topLeft</a>(), pix );
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| 100 | }
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| 101 |
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| 102 |
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| 103 | QRect <a name="f51"></a>CannonField::cannonRect() const
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| 104 | {
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| 105 | <a href="qrect.html">QRect</a> r( 0, 0, 50, 50 );
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| 106 | r.<a href="qrect.html#moveBottomLeft">moveBottomLeft</a>( <a href="qwidget.html#rect">rect</a>().bottomLeft() );
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| 107 | return r;
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| 108 | }
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| 109 |
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| 110 |
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| 111 | QSizePolicy CannonField::<a href="qwidget.html#sizePolicy">sizePolicy</a>() const
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| 112 | {
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| 113 | return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
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| 114 | }
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| 115 | </pre><!-- eof -->
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| 116 | <p><address><hr><div align=center>
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| 117 | <table width=100% cellspacing=0 border=0><tr>
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| 118 | <td>Copyright © 2007
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| 119 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 120 | <td align=right><div align=right>Qt 3.3.8</div>
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| 121 | </table></div></address></body>
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| 122 | </html>
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