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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/tutorial.doc:2027 -->
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>t13/cannon.cpp Example File</title>
+<style type="text/css"><!--
+fn { margin-left: 1cm; text-indent: -1cm; }
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+<tr bgcolor="#E5E5E5">
+<td valign=center>
+ <a href="index.html">
+<font color="#004faf">Home</font></a>
+ | <a href="classes.html">
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+<font color="#004faf">Grouped&nbsp;Classes</font></a>
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+<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>t13/cannon.cpp Example File</h1>
+
+
+<pre>/****************************************************************
+**
+** Implementation CannonField class, Qt tutorial 13
+**
+****************************************************************/
+
+#include "cannon.h"
+#include &lt;<a href="qtimer-h.html">qtimer.h</a>&gt;
+#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
+#include &lt;<a href="qpixmap-h.html">qpixmap.h</a>&gt;
+#include &lt;<a href="qdatetime-h.html">qdatetime.h</a>&gt;
+
+#include &lt;math.h&gt;
+#include &lt;stdlib.h&gt;
+
+
+<a name="f94"></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;
+ timerCount = 0;
+ autoShootTimer = new <a href="qtimer.html">QTimer</a>( this, "movement handler" );
+ <a href="qobject.html#connect">connect</a>( autoShootTimer, SIGNAL(<a href="qtimer.html#timeout">timeout</a>()),
+ this, SLOT(moveShot()) );
+ shoot_ang = 0;
+ shoot_f = 0;
+ target = QPoint( 0, 0 );
+ gameEnded = FALSE;
+ <a href="qwidget.html#setPalette">setPalette</a>( QPalette( QColor( 250, 250, 200) ) );
+ newTarget();
+}
+
+
+void <a name="f95"></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="f96"></a>CannonField::setForce( int newton )
+{
+ if ( newton &lt; 0 )
+ newton = 0;
+ if ( f == newton )
+ return;
+ f = newton;
+ emit forceChanged( f );
+}
+
+
+void <a name="f97"></a>CannonField::shoot()
+{
+ if ( isShooting() )
+ return;
+ timerCount = 0;
+ shoot_ang = ang;
+ shoot_f = f;
+ autoShootTimer-&gt;<a href="qtimer.html#start">start</a>( 50 );
+ emit canShoot( FALSE );
+}
+
+
+void <a name="f98"></a>CannonField::newTarget()
+{
+ static bool first_time = TRUE;
+ if ( first_time ) {
+ first_time = FALSE;
+ <a href="qtime.html">QTime</a> midnight( 0, 0, 0 );
+ srand( midnight.<a href="qtime.html#secsTo">secsTo</a>(QTime::<a href="qtime.html#currentTime">currentTime</a>()) );
+ }
+ <a href="qregion.html">QRegion</a> r( targetRect() );
+ target = QPoint( 200 + rand() % 190,
+ 10 + rand() % 255 );
+ <a href="qwidget.html#repaint">repaint</a>( r.<a href="qrect.html#unite">unite</a>( targetRect() ) );
+}
+
+void <a name="f99"></a>CannonField::setGameOver()
+{
+ if ( gameEnded )
+ return;
+ if ( isShooting() )
+ autoShootTimer-&gt;<a href="qtimer.html#stop">stop</a>();
+ gameEnded = TRUE;
+ <a href="qwidget.html#repaint">repaint</a>();
+}
+
+void <a name="f100"></a>CannonField::restartGame()
+{
+ if ( isShooting() )
+ autoShootTimer-&gt;<a href="qtimer.html#stop">stop</a>();
+ gameEnded = FALSE;
+ <a href="qwidget.html#repaint">repaint</a>();
+ emit canShoot( TRUE );
+}
+
+void <a name="f101"></a>CannonField::moveShot()
+{
+ <a href="qregion.html">QRegion</a> r( shotRect() );
+ timerCount++;
+
+ <a href="qrect.html">QRect</a> shotR = shotRect();
+
+ if ( shotR.<a href="qrect.html#intersects">intersects</a>( targetRect() ) ) {
+ autoShootTimer-&gt;<a href="qtimer.html#stop">stop</a>();
+ emit hit();
+ emit canShoot( TRUE );
+ } else if ( shotR.<a href="qrect.html#x">x</a>() &gt; width() || shotR.<a href="qrect.html#y">y</a>() &gt; height() ) {
+ autoShootTimer-&gt;<a href="qtimer.html#stop">stop</a>();
+ emit missed();
+ emit canShoot( TRUE );
+ } else {
+ r = r.<a href="qrect.html#unite">unite</a>( QRegion( shotR ) );
+ }
+
+ <a href="qwidget.html#repaint">repaint</a>( r );
+}
+
+
+void CannonField::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> *e )
+{
+ <a href="qrect.html">QRect</a> updateR = e-&gt;<a href="qpaintevent.html#rect">rect</a>();
+ <a href="qpainter.html">QPainter</a> p( this );
+
+ if ( gameEnded ) {
+ p.<a href="qpainter.html#setPen">setPen</a>( black );
+ p.<a href="qpainter.html#setFont">setFont</a>( QFont( "Courier", 48, QFont::Bold ) );
+ p.<a href="qpainter.html#drawText">drawText</a>( <a href="qwidget.html#rect">rect</a>(), AlignCenter, "Game Over" );
+ }
+ if ( updateR.<a href="qrect.html#intersects">intersects</a>( cannonRect() ) )
+ paintCannon( &amp;p );
+ if ( isShooting() &amp;&amp; updateR.<a href="qrect.html#intersects">intersects</a>( shotRect() ) )
+ paintShot( &amp;p );
+ if ( !gameEnded &amp;&amp; updateR.<a href="qrect.html#intersects">intersects</a>( targetRect() ) )
+ paintTarget( &amp;p );
+}
+
+
+void <a name="f102"></a>CannonField::paintShot( <a href="qpainter.html">QPainter</a> *p )
+{
+ p-&gt;<a href="qpainter.html#setBrush">setBrush</a>( black );
+ p-&gt;<a href="qpainter.html#setPen">setPen</a>( NoPen );
+ p-&gt;<a href="qpainter.html#drawRect">drawRect</a>( shotRect() );
+}
+
+
+void <a name="f103"></a>CannonField::paintTarget( <a href="qpainter.html">QPainter</a> *p )
+{
+ p-&gt;<a href="qpainter.html#setBrush">setBrush</a>( red );
+ p-&gt;<a href="qpainter.html#setPen">setPen</a>( black );
+ p-&gt;<a href="qpainter.html#drawRect">drawRect</a>( targetRect() );
+}
+
+
+const <a href="qrect.html">QRect</a> barrelRect(33, -4, 15, 8);
+
+void <a name="f104"></a>CannonField::paintCannon( <a href="qpainter.html">QPainter</a> *p )
+{
+ <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> tmp( &amp;pix );
+ tmp.<a href="qpainter.html#setBrush">setBrush</a>( blue );
+ tmp.<a href="qpainter.html#setPen">setPen</a>( NoPen );
+
+ tmp.<a href="qpainter.html#translate">translate</a>( 0, pix.<a href="qpixmap.html#height">height</a>() - 1 );
+ tmp.<a href="qpainter.html#drawPie">drawPie</a>( QRect( -35,-35, 70, 70 ), 0, 90*16 );
+ tmp.<a href="qpainter.html#rotate">rotate</a>( -ang );
+ tmp.<a href="qpainter.html#drawRect">drawRect</a>( barrelRect );
+ tmp.<a href="qpainter.html#end">end</a>();
+
+ p-&gt;<a href="qpainter.html#drawPixmap">drawPixmap</a>( cr.<a href="qrect.html#topLeft">topLeft</a>(), pix );
+}
+
+
+QRect <a name="f105"></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;
+}
+
+
+QRect <a name="f106"></a>CannonField::shotRect() const
+{
+ const double gravity = 4;
+
+ double time = timerCount / 4.0;
+ double velocity = shoot_f;
+ double radians = shoot_ang*3.14159265/180;
+
+ double velx = velocity*cos( radians );
+ double vely = velocity*sin( radians );
+ double x0 = ( barrelRect.<a href="qrect.html#right">right</a>() + 5 )*cos(radians);
+ double y0 = ( barrelRect.<a href="qrect.html#right">right</a>() + 5 )*sin(radians);
+ double x = x0 + velx*time;
+ double y = y0 + vely*time - 0.5*gravity*time*time;
+
+ <a href="qrect.html">QRect</a> r = QRect( 0, 0, 6, 6 );
+ r.<a href="qrect.html#moveCenter">moveCenter</a>( QPoint( qRound(x), height() - 1 - qRound(y) ) );
+ return r;
+}
+
+
+QRect <a name="f107"></a>CannonField::targetRect() const
+{
+ <a href="qrect.html">QRect</a> r( 0, 0, 20, 10 );
+ r.<a href="qrect.html#moveCenter">moveCenter</a>( QPoint(target.x(),height() - 1 - target.y()) );
+ return r;
+}
+
+
+bool <a name="f108"></a>CannonField::isShooting() const
+{
+ return autoShootTimer-&gt;<a href="qtimer.html#isActive">isActive</a>();
+}
+
+
+QSizePolicy CannonField::<a href="qwidget.html#sizePolicy">sizePolicy</a>() const
+{
+ return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
+}
+</pre><!-- eof -->
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+<td>Copyright &copy; 2007
+<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
+<td align=right><div align=right>Qt 3.3.8</div>
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+</html>
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