diff options
| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
|---|---|---|
| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/t11-cannon-cpp.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
Diffstat (limited to 'doc/html/t11-cannon-cpp.html')
| -rw-r--r-- | doc/html/t11-cannon-cpp.html | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/doc/html/t11-cannon-cpp.html b/doc/html/t11-cannon-cpp.html new file mode 100644 index 0000000..18239fe --- /dev/null +++ b/doc/html/t11-cannon-cpp.html @@ -0,0 +1,198 @@ +<!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:1503 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>t11/cannon.cpp Example File</title> +<style type="text/css"><!-- +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>t11/cannon.cpp Example File</h1> + + +<pre>/**************************************************************** +** +** Implementation CannonField class, Qt tutorial 11 +** +****************************************************************/ + +#include "cannon.h" +#include <<a href="qtimer-h.html">qtimer.h</a>> +#include <<a href="qpainter-h.html">qpainter.h</a>> +#include <<a href="qpixmap-h.html">qpixmap.h</a>> + +#include <math.h> + + +<a name="f57"></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; + <a href="qwidget.html#setPalette">setPalette</a>( QPalette( QColor( 250, 250, 200) ) ); +} + + +void <a name="f58"></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="f59"></a>CannonField::setForce( int newton ) +{ + if ( newton < 0 ) + newton = 0; + if ( f == newton ) + return; + f = newton; + emit forceChanged( f ); +} + + +void <a name="f60"></a>CannonField::shoot() +{ + if ( autoShootTimer-><a href="qtimer.html#isActive">isActive</a>() ) + return; + timerCount = 0; + shoot_ang = ang; + shoot_f = f; + autoShootTimer-><a href="qtimer.html#start">start</a>( 50 ); +} + + +void <a name="f61"></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#x">x</a>() > width() || shotR.<a href="qrect.html#y">y</a>() > height() ) + autoShootTimer-><a href="qtimer.html#stop">stop</a>(); + 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-><a href="qpaintevent.html#rect">rect</a>(); + <a href="qpainter.html">QPainter</a> p( this ); + + if ( updateR.<a href="qrect.html#intersects">intersects</a>( cannonRect() ) ) + paintCannon( &p ); + if ( autoShootTimer-><a href="qtimer.html#isActive">isActive</a>() && + updateR.<a href="qrect.html#intersects">intersects</a>( shotRect() ) ) + paintShot( &p ); +} + + +void <a name="f62"></a>CannonField::paintShot( <a href="qpainter.html">QPainter</a> *p ) +{ + p-><a href="qpainter.html#setBrush">setBrush</a>( black ); + p-><a href="qpainter.html#setPen">setPen</a>( NoPen ); + p-><a href="qpainter.html#drawRect">drawRect</a>( shotRect() ); +} + + +const <a href="qrect.html">QRect</a> barrelRect(33, -4, 15, 8); + +void <a name="f63"></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( &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-><a href="qpainter.html#drawPixmap">drawPixmap</a>( cr.<a href="qrect.html#topLeft">topLeft</a>(), pix ); +} + + +QRect <a name="f64"></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="f65"></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; +} + + +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 © 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> +</table></div></address></body> +</html> |