FILE COMMANDS
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These are commands to deal with the filing and retrieval of drawings
and sub-drawings.

The user must select either READ, WRITE or DELETe before the DRAWG, 
SUBDR or TEXT specifications. Thus the complete sequence is FILE READ 
SUBDR or FILE WRITE SUBDR etc..

If the READ TEXT or READ SUBDR options are last selected with the left 
button, scaling factors can be applied to the X and Y co-ordinate 
values separately. This is very useful in transforming between units,
e.g. a factor of 0.03937 would be used to transform MM units to Inch
units. If the X and Y scalings are different, arcs may become distorted
spirals. All other dimensions, e.g. Symbol Heights, are modified by
the Y scaling factor. Also allows for extraction of maximum or minimum
models if dimensions are specified with tolerances. Not valid if more
than one dimension specified for each of X and Y directions. This also
allows the user change all entities defined in one PEN NUMBER to be
reassigned to another PEN NUMBER. The reassignment must first be
selected by the MODE DRAW PEN option.

If the WRITE TEXT or WRITE SUBDR options are last selected with the 
left button, the user can choose to eliminate double lines or merge
points that are close together, as well as redefining the RANGE of
the sub-drawing for future compositions.

The TEXT command will result in a file which can be edited by the
user using the system text editor. This facility should normally only
be used to interface QikDraw with other computer programs.

The DRAWG commands are similar to the SUBDRawing commands when filing.
However, the drawing information will only contain the placement of
sub-drawings, and can be stored only after COMPOsing (see UTILIties)
the drawing.

SUBDRawings or DRAWinGs can be assigned a name. On any drawing file,
there can be up to 120 drawings and 120 subdrawings.

Before writing a subdrawing to a file, it is advisable to define
reference points (see SET REF) for the subdrawing to allow for
ease of retrieval.

DELETe can apply to subdrawings, drawings or any file. If files are to
be deleted, the option to use is FILE DELET TEXT. This deletion is not
restricted to textfiles.

FILE CLEAN will allow the cleaning up of data or symbol files. The old
files will be compressed upon copying to a new file. The order of
subdrawing and drawing names may be optionally sorted.

Any sub-drawing may be read in as a REFERENCE DRAWING. This can be done 
only before any other information has been created. The REF-D would be 
displayed (lines only) as dotted lines. The REF-D can be re-drawn by the 
DRAW REF-D command.

VIEW will allow the viewing of text files.

DIRectory command would allow user to check on the drawings and 
sub-drawings stored on file. 

Use the *BACKup command for fast backup. The structure of the file is
similar to FILE WRITE SUBD but is completely written to the file
BCKFIL.BCK. Users will be reminded to perform the backup function after 
a set number of operations. This is completely optional.

Replays will start from the last version that was backed up.

RETRIeve is now used to retrieve the backup Sub-Drawing (changed from
previous function). Be careful if there are existing entities.

