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85 lines
1.6 KiB
85 lines
1.6 KiB
#!/usr/bin/env ruby -w
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require 'Qt'
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#
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# Forever - a widget that draws rectangles forever.
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#
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class Forever < TQt::Widget
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NUM_COLORS = 120
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#
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# Constructs a Forever widget.
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#
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slots 'updateCaption()'
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def initialize(*k)
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super(nil)
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@colors = []
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0.upto(NUM_COLORS-1) do |a|
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@colors[a] = TQt::Color.new( rand(255),
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rand(255),
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rand(255) )
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end
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@rectangles = 0
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startTimer( 0 ) # run continuous timer
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counter = TQt::Timer.new( self )
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connect( counter, TQ_SIGNAL("timeout()"),
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self, TQ_SLOT("updateCaption()") )
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counter.start( 1000 )
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end
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def updateCaption()
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s = "Qt Example - Forever - " + @rectangles.to_s + " rectangles/second"
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@rectangles = 0
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self.caption = s
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end
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#
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# Handles paint events for the Forever widget.
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#
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def paintEvent( e )
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paint = TQt::Painter.new( self ) # painter object
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w = width()
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h = height()
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if w <= 0 || h <= 0 then
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return
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end
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paint.setPen( NoPen ) # do not draw outline
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paint.setBrush( @colors[rand(NUM_COLORS)]) # set random brush color
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p1 = TQt::Point.new( rand(w), rand(h)) # p1 = top left
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p2 = TQt::Point.new( rand(w), rand(h)) # p2 = bottom right
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r = TQt::Rect.new( p1, p2 )
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paint.drawRect( r ) # draw filled rectangle
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paint.end()
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end
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#
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# Handles timer events for the Forever widget.
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#
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def timerEvent( e )
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0.upto(99) do |i|
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repaint( false ) # repaint, don't erase
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end
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@rectangles += 100
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end
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end
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a = TQt::Application.new(ARGV)
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always = Forever.new
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always.resize( 400, 250 ) # start up with size 400x250
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a.mainWidget = always # set as main widget
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always.caption = "QtRuby Example - Forever"
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always.show
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a.exec
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