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81 lines
1.6 KiB
81 lines
1.6 KiB
14 years ago
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/****************************************************************
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**
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** Implementation CannonField class, Qt tutorial 10
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**
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****************************************************************/
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#include "cannon.h"
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#include <qpainter.h>
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#include <qpixmap.h>
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CannonField::CannonField( QWidget *parent, const char *name )
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: QWidget( parent, name )
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{
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ang = 45;
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f = 0;
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setPalette( QPalette( QColor( 250, 250, 200) ) );
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}
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void CannonField::setAngle( int degrees )
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{
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if ( degrees < 5 )
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degrees = 5;
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if ( degrees > 70 )
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degrees = 70;
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if ( ang == degrees )
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return;
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ang = degrees;
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repaint( cannonRect(), FALSE );
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emit angleChanged( ang );
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}
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void CannonField::setForce( int newton )
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{
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if ( newton < 0 )
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newton = 0;
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if ( f == newton )
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return;
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f = newton;
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emit forceChanged( f );
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}
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void CannonField::paintEvent( QPaintEvent *e )
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{
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if ( !e->rect().intersects( cannonRect() ) )
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return;
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QRect cr = cannonRect();
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QPixmap pix( cr.size() );
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pix.fill( this, cr.topLeft() );
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QPainter p( &pix );
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p.setBrush( blue );
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p.setPen( NoPen );
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p.translate( 0, pix.height() - 1 );
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p.drawPie( QRect( -35,-35, 70, 70 ), 0, 90*16 );
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p.rotate( -ang );
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p.drawRect( QRect(33, -4, 15, 8) );
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p.end();
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p.begin( this );
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p.drawPixmap( cr.topLeft(), pix );
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}
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QRect CannonField::cannonRect() const
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{
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QRect r( 0, 0, 50, 50 );
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r.moveBottomLeft( rect().bottomLeft() );
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return r;
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}
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QSizePolicy CannonField::sizePolicy() const
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{
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return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
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}
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