POINT MANIPULATIONS
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Points may be ADDED, DELETED or MOVED.

When points are moved or deleted, all the other graphics attributes 
(e.g. lines, dimensions) associated with those points altered will be 
altered.

By default, points are added via the PUCK. The key-board or a file
can be selected as the input device by specifying MODE KEY-B, or
MODE FILE.

By default, points are added or moved in a free-hand manner. By using 
the MODE SNAP command, these manipulations can be made to snap to the 
defined grid spacings. This effect can be cancelled by selecting MODE 
NOSNAP. 

If the "ADD" or "MOVE" option is selected with the LEFT BUTTON, then 
the tertiary graphics menu would be displayed, offering a number of 
alternate means of points specifications. These include:-

    Specifying points relative to another point;
    Specifying points relative to another point in Polar coordinates;
    Specifying points relative to a line (Cartesian or Polar);
    Specifying points to be lying on a line;
    Specifying a number of points to be spaced in prescribed ratios
        between two known points (applies to additions only);
    Specifying points at intersection of two lines;
    Specifying points at intersection of line with circle/arc.
    Specifying points at intersection of circles.
    
After selecting the appropriate option, points would be ADDed or MOVEd
in accordance with the selected option.

A point inadvertently moved may be restored to its previous position
by immediately pressing the LEFT button.

If the DELETE option is selected with the LEFT BUTTON, then the user
will be offered the option to delete all free-standing points.

The ADJUSt option is similar to MOVE. The co-ordinates of the point
would be displayed and the user would be prompted for the new 
co-ordinates, which can be relative to the old co-ordinates.

The commands POINT SY-PT and POINT SS-PT allows the user to extract 
points from the vertices of SYMBOLS and SUPER SYMBOLS respectively.

The command POINT RD-PT allows the user to extract points from 
reference drawings.
