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(angle)
    if angle < 5
      angle = 5
    elsif angle > 70
      angle = 70
    end

    if @currentAngle == angle
      return
    end

    @currentAngle = angle
    update()
    emit angleChanged(@currentAngle)
  end

  def paintEvent(event)
    painter = Qt::Painter.new(self)
    painter.drawText(200, 200, tr("Angle = #{@currentAngle}"))
    painter.end()
  end
end