1 files changed, 80 insertions, 0 deletions
diff --git a/tutorial/t10/cannon.cpp b/tutorial/t10/cannon.cpp
new file mode 100644
index 0000000..67e6f9a
--- /dev/null
+++ b/tutorial/t10/cannon.cpp
@@ -0,0 +1,80 @@
+/****************************************************************
+**
+** Implementation CannonField class, Qt tutorial 10
+**
+****************************************************************/
+
+#include "cannon.h"
+#include <qpainter.h>
+#include <qpixmap.h>
+
+
+CannonField::CannonField( QWidget *parent, const char *name )
+        : QWidget( parent, name )
+{
+    ang = 45;
+    f = 0;
+    setPalette( QPalette( QColor( 250, 250, 200) ) );
+}
+
+
+void CannonField::setAngle( int degrees )
+{
+    if ( degrees < 5 )
+	degrees = 5;
+    if ( degrees > 70 )
+	degrees = 70;
+    if ( ang == degrees )
+	return;
+    ang = degrees;
+    repaint( cannonRect(), FALSE );
+    emit angleChanged( ang );
+}
+
+
+void CannonField::setForce( int newton )
+{
+    if ( newton < 0 )
+	newton = 0;
+    if ( f == newton )
+	return;
+    f = newton;
+    emit forceChanged( f );
+}
+
+
+void CannonField::paintEvent( QPaintEvent *e )
+{
+    if ( !e->rect().intersects( cannonRect() ) )
+	return;
+
+    QRect cr = cannonRect();
+    QPixmap pix( cr.size() );
+    pix.fill( this, cr.topLeft() );
+
+    QPainter p( &pix );
+    p.setBrush( blue );
+    p.setPen( NoPen );
+    p.translate( 0, pix.height() - 1 );
+    p.drawPie( QRect( -35,-35, 70, 70 ), 0, 90*16 );
+    p.rotate( -ang );
+    p.drawRect( QRect(33, -4, 15, 8) );
+    p.end();
+
+    p.begin( this );
+    p.drawPixmap( cr.topLeft(), pix );
+}
+
+
+QRect CannonField::cannonRect() const
+{
+    QRect r( 0, 0, 50, 50 );
+    r.moveBottomLeft( rect().bottomLeft() );
+    return r;
+}
+
+
+QSizePolicy CannonField::sizePolicy() const
+{
+    return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
+}