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t9/cannon.cpp Example File

#****************************************************************
#**
#** Implementation CannonField class, Qt tutorial 9
#**
#****************************************************************

require 'Qt'

class CannonField < Qt::Widget
    signals 'angleChanged(int)'
    slots 'setAngle(int)'
    
    def initialize(parent, name)
        super
        @ang = 45
        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 paintEvent( event )
        p = Qt::Painter.new( self )

        p.setBrush( blue )
        p.setPen( Qt::NoPen )
        p.translate( 0, rect().bottom() )
        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()        
    end

    def sizePolicy()
        return Qt::SizePolicy.new( Qt::SizePolicy::Expanding, Qt::SizePolicy::Expanding )
    end
end