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require 'Qt4'
class CannonField < Qt::Widget
signals 'angleChanged(int)'
slots 'setAngle(int)'
def initialize(parent = nil)
super
@currentAngle = 45
setPalette( Qt::Palette.new( Qt::Color.new( 250, 250, 200) ) )
setAutoFillBackground(true)
end
def setAngle( degrees )
if degrees < 5
degrees = 5
elsif degrees > 70
degrees = 70
end
if @currentAngle == degrees
return
end
@currentAngle = degrees
repaint()
emit angleChanged( @currentAngle )
end
def paintEvent( event )
painter = Qt::Painter.new( self )
painter.setPen( Qt::NoPen )
painter.setBrush( Qt::Brush.new(Qt::blue) )
painter.translate( 0, rect().bottom() )
painter.drawPie( Qt::Rect.new(-35, -35, 70, 70), 0, 90*16 )
painter.rotate( - @currentAngle )
painter.drawRect( Qt::Rect.new(33, -4, 15, 8) )
painter.end()
end
def sizePolicy()
return Qt::SizePolicy.new( Qt::SizePolicy::Expanding, Qt::SizePolicy::Expanding )
end
end
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