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require 'Qt4'
class CannonField < Qt::Widget
signals 'angleChanged(int)', 'forceChanged(int)'
slots 'setAngle(int)', 'setForce(int)'
def initialize(parent = nil)
super
@ang = 45
@f = 0
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 @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() )
painter = Qt::Painter.new( pix )
painter.setBrush( Qt::Brush.new(Qt::blue) )
painter.setPen( Qt::NoPen )
painter.translate( 0, pix.height() - 1 )
painter.drawPie( Qt::Rect.new(-35, -35, 70, 70), 0, 90*16 )
painter.rotate( - @ang )
painter.drawRect( Qt::Rect.new(33, -4, 15, 8) )
painter.end()
painter.begin(self)
painter.drawPixmap(cr.topLeft(), pix )
painter.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
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