COMMAND NAME:

        DRAW

USAGE:

        For a signal with no states:
        DRAW <sig_name_position> [<pan to end>] <initial hi lo value> 
                                                             <next point> ...

        For a signal with pre-existing states:
        DRAW <sig_name_position> <define end> [<pan to end>] <next point> ...
        DRAW <sig_name_position> [<pan to end>] <next point> ...


        This command allows the user to sketch the waveform of signal
        <sig_name_position>.  <sig_name_position> can be specified via the
        signal name or number using the keyboard OR by position using the LEFT
        MOUSE BUTTON. The signal must already exist in the database (via
        READ or ADD commands).  

        If the signal has as yet no states, the user must supply only
        the initial hi/lo value for time zero and subsequent toggle values.
        These can be entered using either mouse or keyboard. 

        If the signal has existing states, the user may continue digitizing 
        toggle points from the end of the signal. The user will be required 
        to first define this end should the signal be of type "ptn" or "clk".
        If the end of the signal is not on the screen, the user is
        prompted as to whether the end should be displayed on the screen.


        LEFT MOUSE BUTTON: digitize points (specify a state change from a
        hi/lo state to the opposite state)

        MIDDLE MOUSE BUTTON: erase last state change

        RIGHT MOUSE BUTTON: terminate sketching

        "hi" point: enter "1" via the keyboard or click RIGHT mouse
        button on upper grid line in signal's partition. (see drawing below)

        "lo" point: enter "0" via the keyboard or click RIGHT mouse
        button on lower grid line in signal's partition. (see drawing below)


        . . . . . . . . . . . . . . . . . . .
        . . . . . . . . . . . . . . . . . . .
        -------------------------------------   <- partition line
        .signalname . . . . . . . . . . . . .   <- upper grid line
        . . . . . . . . . . . . . . . . . . .   <- lower grid line
        _____________________________________   <- partition line

        . . . . . . . . . . . . . . . . . . .
        . . . . . . . . . . . . . . . . . . .
        _____________________________________ 
