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-rw-r--r--qtruby/rubylib/tutorial/t10/cannon.rb71
1 files changed, 71 insertions, 0 deletions
diff --git a/qtruby/rubylib/tutorial/t10/cannon.rb b/qtruby/rubylib/tutorial/t10/cannon.rb
new file mode 100644
index 00000000..3c02f8ff
--- /dev/null
+++ b/qtruby/rubylib/tutorial/t10/cannon.rb
@@ -0,0 +1,71 @@
+require 'Qt'
+
+class CannonField < Qt::Widget
+ signals 'angleChanged(int)', 'forceChanged(int)'
+ slots 'setAngle(int)', 'setForce(int)'
+
+ def initialize(parent, name)
+ super
+ @ang = 45
+ @f = 0
+ setPalette( Qt::Palette.new( Qt::Color.new( 250, 250, 200) ) )
+ end
+
+ def setAngle( degrees )
+ if degrees < 5
+ degrees = 5
+ elsif degrees > 70
+ degrees = 70
+ end
+ if @ang == degrees
+ return
+ end
+ @ang = degrees
+ repaint()
+ emit angleChanged( @ang )
+ end
+
+ def setForce( newton )
+ if newton < 0
+ newton = 0
+ end
+ if @f == newton
+ return
+ end
+ @f = newton
+ emit forceChanged( @f )
+ end
+
+ def paintEvent( e )
+ if !e.rect().intersects( cannonRect() )
+ return
+ end
+
+ cr = cannonRect()
+ pix = Qt::Pixmap.new( cr.size() )
+ pix.fill( self, cr.topLeft() )
+
+ p = Qt::Painter.new( pix )
+ p.setBrush( blue )
+ p.setPen( Qt::NoPen )
+ p.translate( 0, pix.height() - 1 )
+ p.drawPie( Qt::Rect.new(-35, -35, 70, 70), 0, 90*16 )
+ p.rotate( - @ang )
+ p.drawRect( Qt::Rect.new(33, -4, 15, 8) )
+ p.end()
+
+ p.begin(self)
+ p.drawPixmap(cr.topLeft(), pix )
+ p.end()
+ end
+
+ def cannonRect()
+ r = Qt::Rect.new( 0, 0, 50, 50)
+ r.moveBottomLeft( rect().bottomLeft() )
+ return r
+ end
+
+ def sizePolicy()
+ return Qt::SizePolicy.new( Qt::SizePolicy::Expanding, Qt::SizePolicy::Expanding )
+ end
+end