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require "tkclass"
$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, 'fill' => 'gray')
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{|e| do_motion e.x,e.y})
$c.bind("ButtonRelease-1", proc{|e| do_release e.x,e.y})
Tk.mainloop
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