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+<title>t10/cannon.cpp Example File</title>
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+<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 &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
+#include &lt;<a href="qpixmap-h.html">qpixmap.h</a>&gt;
+
+
+<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 &lt; 5 )
+        degrees = 5;
+    if ( degrees &gt; 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 &lt; 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-&gt;<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( &amp;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 -->
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+<td align=right><div align=right>Qt 3.3.8</div>
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