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require "tkclass"
$tkline_init = FALSE
def start_random
return if $tkline_init
$tkline_init = TRUE
if defined? Thread
Thread.start do
loop do
sleep 2
Line.new($c, rand(400), rand(200), rand(400), rand(200))
end
end
end
end
$c = Canvas.new
$c.pack
$start_x = start_y = 0
def do_press(x, y)
$start_x = x
$start_y = y
$current_line = Line.new($c, x, y, x, y)
start_random
end
def do_motion(x, y)
if $current_line
$current_line.coords $start_x, $start_y, x, y
end
end
def do_release(x, y)
if $current_line
$current_line.coords $start_x, $start_y, x, y
$current_line.fill 'black'
$current_line = nil
end
end
$c.bind("1", proc{|e| do_press e.x, e.y})
$c.bind("B1-Motion", proc{|x, y| do_motion x, y}, "%x %y")
$c.bind("ButtonRelease-1", proc{|x, y| do_release x, y}, "%x %y")
Tk.mainloop
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