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< pre > /****************************************************************
**
** Implementation CannonField class, TQt tutorial 11
**
****************************************************************/
#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 < math.h>
< a name = "f57" > < / 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;
< a href = "ntqwidget.html#setPalette" > setPalette< / a > ( TQPalette( TQColor( 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 = "ntqwidget.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 = "ntqtimer.html#isActive" > isActive< / a > () )
return;
timerCount = 0;
shoot_ang = ang;
shoot_f = f;
autoShootTimer-> < a href = "ntqtimer.html#start" > start< / a > ( 50 );
}
void < a name = "f61" > < / 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#x" > x< / a > () > width() || shotR.< a href = "ntqrect.html#y" > y< / a > () > height() )
autoShootTimer-> < a href = "ntqtimer.html#stop" > stop< / a > ();
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#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 ( updateR.< a href = "ntqrect.html#intersects" > intersects< / a > ( cannonRect() ) )
paintCannon( & p );
if ( autoShootTimer-> < a href = "ntqtimer.html#isActive" > isActive< / a > () & &
updateR.< a href = "ntqrect.html#intersects" > intersects< / a > ( shotRect() ) )
paintShot( & p );
}
void < a name = "f62" > < / 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() );
}
const < a href = "ntqrect.html" > TQRect< / a > barrelRect(33, -4, 15, 8);
void < a name = "f63" > < / 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 = "f64" > < / 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 = "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 = "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( qRound(x), height() - 1 - qRound(y) ) );
return r;
}
TQSizePolicy CannonField::< a href = "ntqwidget.html#sizePolicy" > sizePolicy< / a > () const
{
return TQSizePolicy( TQSizePolicy::Expanding, TQSizePolicy::Expanding );
}
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