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72 lines
1.6 KiB
72 lines
1.6 KiB
15 years ago
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require 'Qt'
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class CannonField < Qt::Widget
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signals 'angleChanged(int)', 'forceChanged(int)'
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slots 'setAngle(int)', 'setForce(int)'
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def initialize(parent, name)
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super
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@ang = 45
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@f = 0
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setPalette( Qt::Palette.new( Qt::Color.new( 250, 250, 200) ) )
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end
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def setAngle( degrees )
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if degrees < 5
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degrees = 5
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elsif degrees > 70
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degrees = 70
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end
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if @ang == degrees
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return
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end
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@ang = degrees
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repaint()
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emit angleChanged( @ang )
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end
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def setForce( newton )
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if newton < 0
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newton = 0
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end
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if @f == newton
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return
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end
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@f = newton
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emit forceChanged( @f )
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end
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def paintEvent( e )
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if !e.rect().intersects( cannonRect() )
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return
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end
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cr = cannonRect()
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pix = Qt::Pixmap.new( cr.size() )
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pix.fill( self, cr.topLeft() )
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p = Qt::Painter.new( pix )
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p.setBrush( blue )
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p.setPen( Qt::NoPen )
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p.translate( 0, pix.height() - 1 )
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p.drawPie( Qt::Rect.new(-35, -35, 70, 70), 0, 90*16 )
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p.rotate( - @ang )
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p.drawRect( Qt::Rect.new(33, -4, 15, 8) )
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p.end()
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p.begin(self)
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p.drawPixmap(cr.topLeft(), pix )
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p.end()
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end
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def cannonRect()
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r = Qt::Rect.new( 0, 0, 50, 50)
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r.moveBottomLeft( rect().bottomLeft() )
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return r
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end
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def sizePolicy()
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return Qt::SizePolicy.new( Qt::SizePolicy::Expanding, Qt::SizePolicy::Expanding )
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end
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end
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