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