<!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:2376 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>t14/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>t14/cannon.cpp Example File</h1> <pre>/**************************************************************** ** ** Implementation CannonField class, TQt tutorial 14 ** ****************************************************************/ #include "cannon.h" #include <<a href="qtimer-h.html">ntqtimer.h</a>> #include <<a href="qpainter-h.html">ntqpainter.h</a>> #include <<a href="qpixmap-h.html">ntqpixmap.h</a>> #include <<a href="qdatetime-h.html">ntqdatetime.h</a>> #include <math.h> #include <stdlib.h> <a name="f121"></a>CannonField::CannonField( <a href="ntqwidget.html">TQWidget</a> *parent, const char *name ) : <a href="ntqwidget.html">TQWidget</a>( parent, name ) { ang = 45; f = 0; timerCount = 0; autoShootTimer = new <a href="ntqtimer.html">TQTimer</a>( this, "movement handler" ); <a href="ntqobject.html#connect">connect</a>( autoShootTimer, SIGNAL(<a href="ntqtimer.html#timeout">timeout</a>()), this, SLOT(moveShot()) ); shoot_ang = 0; shoot_f = 0; target = TQPoint( 0, 0 ); gameEnded = FALSE; barrelPressed = FALSE; <a href="ntqwidget.html#setPalette">setPalette</a>( TQPalette( TQColor( 250, 250, 200) ) ); newTarget(); } void <a name="f122"></a>CannonField::setAngle( int degrees ) { if ( degrees < 5 ) degrees = 5; if ( degrees > 70 ) degrees = 70; if ( ang == degrees ) return; ang = degrees; <a href="ntqwidget.html#repaint">repaint</a>( cannonRect(), FALSE ); emit angleChanged( ang ); } void <a name="f123"></a>CannonField::setForce( int newton ) { if ( newton < 0 ) newton = 0; if ( f == newton ) return; f = newton; emit forceChanged( f ); } void <a name="f124"></a>CannonField::shoot() { if ( isShooting() ) return; timerCount = 0; shoot_ang = ang; shoot_f = f; autoShootTimer-><a href="ntqtimer.html#start">start</a>( 50 ); emit canShoot( FALSE ); } void <a name="f125"></a>CannonField::newTarget() { static bool first_time = TRUE; if ( first_time ) { first_time = FALSE; <a href="qtime.html">TQTime</a> midnight( 0, 0, 0 ); srand( midnight.<a href="qtime.html#secsTo">secsTo</a>(TQTime::<a href="qtime.html#currentTime">currentTime</a>()) ); } <a href="ntqregion.html">TQRegion</a> r( targetRect() ); target = TQPoint( 200 + rand() % 190, 10 + rand() % 255 ); <a href="ntqwidget.html#repaint">repaint</a>( r.<a href="ntqrect.html#unite">unite</a>( targetRect() ) ); } void <a name="f126"></a>CannonField::setGameOver() { if ( gameEnded ) return; if ( isShooting() ) autoShootTimer-><a href="ntqtimer.html#stop">stop</a>(); gameEnded = TRUE; <a href="ntqwidget.html#repaint">repaint</a>(); } void <a name="f127"></a>CannonField::restartGame() { if ( isShooting() ) autoShootTimer-><a href="ntqtimer.html#stop">stop</a>(); gameEnded = FALSE; <a href="ntqwidget.html#repaint">repaint</a>(); emit canShoot( TRUE ); } void <a name="f128"></a>CannonField::moveShot() { <a href="ntqregion.html">TQRegion</a> r( shotRect() ); timerCount++; <a href="ntqrect.html">TQRect</a> shotR = shotRect(); if ( shotR.<a href="ntqrect.html#intersects">intersects</a>( targetRect() ) ) { autoShootTimer-><a href="ntqtimer.html#stop">stop</a>(); emit hit(); emit canShoot( TRUE ); } else if ( shotR.<a href="ntqrect.html#x">x</a>() > width() || shotR.<a href="ntqrect.html#y">y</a>() > height() || shotR.<a href="ntqrect.html#intersects">intersects</a>(barrierRect()) ) { autoShootTimer-><a href="ntqtimer.html#stop">stop</a>(); emit missed(); emit canShoot( TRUE ); } else { r = r.<a href="ntqrect.html#unite">unite</a>( TQRegion( shotR ) ); } <a href="ntqwidget.html#repaint">repaint</a>( r ); } void CannonField::<a href="ntqwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> *e ) { if ( e-><a href="qmouseevent.html#button">button</a>() != LeftButton ) return; if ( barrelHit( e-><a href="qmouseevent.html#pos">pos</a>() ) ) barrelPressed = TRUE; } void CannonField::<a href="ntqwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> *e ) { if ( !barrelPressed ) return; <a href="ntqpoint.html">TQPoint</a> pnt = e-><a href="qmouseevent.html#pos">pos</a>(); if ( pnt.<a href="ntqpoint.html#x">x</a>() <= 0 ) pnt.<a href="ntqpoint.html#setX">setX</a>( 1 ); if ( pnt.<a href="ntqpoint.html#y">y</a>() >= <a href="ntqwidget.html#height">height</a>() ) pnt.<a href="ntqpoint.html#setY">setY</a>( <a href="ntqwidget.html#height">height</a>() - 1 ); double rad = atan(((double)<a href="ntqwidget.html#rect">rect</a>().bottom()-pnt.<a href="ntqpoint.html#y">y</a>())/pnt.<a href="ntqpoint.html#x">x</a>()); setAngle( tqRound ( rad*180/3.14159265 ) ); } void CannonField::<a href="ntqwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> *e ) { if ( e-><a href="qmouseevent.html#button">button</a>() == LeftButton ) barrelPressed = FALSE; } void CannonField::<a href="ntqwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">TQPaintEvent</a> *e ) { <a href="ntqrect.html">TQRect</a> updateR = e-><a href="qpaintevent.html#rect">rect</a>(); <a href="ntqpainter.html">TQPainter</a> p( this ); if ( gameEnded ) { p.<a href="ntqpainter.html#setPen">setPen</a>( black ); p.<a href="ntqpainter.html#setFont">setFont</a>( TQFont( "Courier", 48, TQFont::Bold ) ); p.<a href="ntqpainter.html#drawText">drawText</a>( <a href="ntqwidget.html#rect">rect</a>(), AlignCenter, "Game Over" ); } if ( updateR.<a href="ntqrect.html#intersects">intersects</a>( cannonRect() ) ) paintCannon( &p ); if ( updateR.<a href="ntqrect.html#intersects">intersects</a>( barrierRect() ) ) paintBarrier( &p ); if ( isShooting() && updateR.<a href="ntqrect.html#intersects">intersects</a>( shotRect() ) ) paintShot( &p ); if ( !gameEnded && updateR.<a href="ntqrect.html#intersects">intersects</a>( targetRect() ) ) paintTarget( &p ); } void <a name="f129"></a>CannonField::paintShot( <a href="ntqpainter.html">TQPainter</a> *p ) { p-><a href="ntqpainter.html#setBrush">setBrush</a>( black ); p-><a href="ntqpainter.html#setPen">setPen</a>( NoPen ); p-><a href="ntqpainter.html#drawRect">drawRect</a>( shotRect() ); } void <a name="f130"></a>CannonField::paintTarget( <a href="ntqpainter.html">TQPainter</a> *p ) { p-><a href="ntqpainter.html#setBrush">setBrush</a>( red ); p-><a href="ntqpainter.html#setPen">setPen</a>( black ); p-><a href="ntqpainter.html#drawRect">drawRect</a>( targetRect() ); } void <a name="f131"></a>CannonField::paintBarrier( <a href="ntqpainter.html">TQPainter</a> *p ) { p-><a href="ntqpainter.html#setBrush">setBrush</a>( yellow ); p-><a href="ntqpainter.html#setPen">setPen</a>( black ); p-><a href="ntqpainter.html#drawRect">drawRect</a>( barrierRect() ); } const <a href="ntqrect.html">TQRect</a> barrelRect(33, -4, 15, 8); void <a name="f132"></a>CannonField::paintCannon( <a href="ntqpainter.html">TQPainter</a> *p ) { <a href="ntqrect.html">TQRect</a> cr = cannonRect(); <a href="ntqpixmap.html">TQPixmap</a> pix( cr.<a href="ntqrect.html#size">size</a>() ); pix.<a href="ntqpixmap.html#fill">fill</a>( this, cr.<a href="ntqrect.html#topLeft">topLeft</a>() ); <a href="ntqpainter.html">TQPainter</a> tmp( &pix ); tmp.<a href="ntqpainter.html#setBrush">setBrush</a>( blue ); tmp.<a href="ntqpainter.html#setPen">setPen</a>( NoPen ); tmp.<a href="ntqpainter.html#translate">translate</a>( 0, pix.<a href="ntqpixmap.html#height">height</a>() - 1 ); tmp.<a href="ntqpainter.html#drawPie">drawPie</a>( TQRect( -35,-35, 70, 70 ), 0, 90*16 ); tmp.<a href="ntqpainter.html#rotate">rotate</a>( -ang ); tmp.<a href="ntqpainter.html#drawRect">drawRect</a>( barrelRect ); tmp.<a href="ntqpainter.html#end">end</a>(); p-><a href="ntqpainter.html#drawPixmap">drawPixmap</a>( cr.<a href="ntqrect.html#topLeft">topLeft</a>(), pix ); } TQRect <a name="f133"></a>CannonField::cannonRect() const { <a href="ntqrect.html">TQRect</a> r( 0, 0, 50, 50 ); r.<a href="ntqrect.html#moveBottomLeft">moveBottomLeft</a>( <a href="ntqwidget.html#rect">rect</a>().bottomLeft() ); return r; } TQRect <a name="f134"></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="ntqrect.html#right">right</a>() + 5 )*cos(radians); double y0 = ( barrelRect.<a href="ntqrect.html#right">right</a>() + 5 )*sin(radians); double x = x0 + velx*time; double y = y0 + vely*time - 0.5*gravity*time*time; <a href="ntqrect.html">TQRect</a> r = TQRect( 0, 0, 6, 6 ); r.<a href="ntqrect.html#moveCenter">moveCenter</a>( TQPoint( tqRound(x), height() - 1 - tqRound(y) ) ); return r; } TQRect <a name="f135"></a>CannonField::targetRect() const { <a href="ntqrect.html">TQRect</a> r( 0, 0, 20, 10 ); r.<a href="ntqrect.html#moveCenter">moveCenter</a>( TQPoint(target.x(),height() - 1 - target.y()) ); return r; } TQRect <a name="f136"></a>CannonField::barrierRect() const { return TQRect( 145, height() - 100, 15, 100 ); } bool <a name="f137"></a>CannonField::barrelHit( const <a href="ntqpoint.html">TQPoint</a> &p ) const { <a href="ntqwmatrix.html">TQWMatrix</a> mtx; mtx.<a href="ntqwmatrix.html#translate">translate</a>( 0, height() - 1 ); mtx.<a href="ntqwmatrix.html#rotate">rotate</a>( -ang ); mtx = mtx.<a href="ntqwmatrix.html#invert">invert</a>(); return barrelRect.<a href="ntqrect.html#contains">contains</a>( mtx.<a href="ntqwmatrix.html#map">map</a>(p) ); } bool <a name="f138"></a>CannonField::isShooting() const { return autoShootTimer-><a href="ntqtimer.html#isActive">isActive</a>(); } TQSize CannonField::<a href="ntqwidget.html#sizeHint">sizeHint</a>() const { return TQSize( 400, 300 ); } TQSizePolicy CannonField::<a href="ntqwidget.html#sizePolicy">sizePolicy</a>() const { return TQSizePolicy( TQSizePolicy::Expanding, TQSizePolicy::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>TQt 3.3.8</div> </table></div></address></body> </html>