[vtkusers] How to get blinkining effect in tcl/tk

[rudreswar]

 hi all,

    I have a problem in tcl/tk.  My requirement is  to get the blinking effect. i.e., There will be a circle which simulates an LED(light emitting diode), this circle should be continuously repainted with 500 milliseconds of delay time to that i will get the blinking effect of an LED. If any body have answer please help in finding solution for the problem

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