DIMENSIONS MANIPULATIONS
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Dimensioning is achieved in QikDraw in either AUTOMATIC or MANUAL mode. 
The AUTOMATIC mode is really semi-automatic, because the user will be 
prompted for the location of the dimension line, the length of the 
projection lines (as a fraction of the distance between the dimension 
line and the points to be dimensioned), the orientation of the 
dimension line, and the points to be dimensioned. The points to be 
dimensioned do not have to be specified in any specific order. QikDraw 
will then extract the dimensioning information and insert the values. 
In MANUAL mode, only the lines are drawn, the values are not inserted. 
The user can then insert any annotation by using symbol strings.

Note that the dimensions are directly related to the references 
(points/lines), and would be altered if these references are altered.

If it is desired to position individual dimensioning values, then the
dimensioning can be made tied to points generated. The values can then
be re-positioned by moving the relevant points. This feature can be
selected or deselected through the use of the CHANGE command.
Orientation of the values does not have to coincide with orientation
of the dimension lines.

Orientation of dimension lines or dimension values may be horizontal,
vertical or parallel to an existing line.

The following secondary selections are allowed:-
    OPTIONS:- Various dimensioning options are displayed graphically.
    ADD:-     Dimensions are added in accordance with the selected
              option.
    DELETE:-  Dimensions are deleted by locating the reference.
              If option selected with the LEFT button, the user will be  
              able to delete dimensions in reverse order of storage.
    CHANGE:-  Allows changes to the following specifications:-
                  Whether MANUAL or AUTO;
                  Pen and thickness definitions;
                  Length of projection lines;
                  Terminator type and size;
                  Size of dimension values;
                  Orientation of dimension values;
                  Multiplier applied to the values;
                  Number of decimal places; (-ve for rounding up)
                  Tolerance definition;
                  Whether dimension values are tied to points;
                  The prefixing/suffixing of PHI or R;
                  Associating to a symbol string for orientation, width
                     scaling, padding and slant specifications;
                  Degree minute and second specification for angles;
                  Separator for the 1000th digit.
              Alternate selection allows for the change of PEN NUMBER
              only, or line style and thickness only. This selection
              also allows for changes in GLOBAL mode.
    PEN:-     Defining PEN and line thickness as for lines. The 
              thickness definition applies to the value only. The line 
              work is always done with the minimum thickness.
              The default PEN NUMBER for dimensioning is 0.
    SPECI:-   Specifying Default values for the dimensions.
              Similar to CHANGe. Some of the tertiary selections
              are:-
              DECI:-  Specifies the number of decimal digits for 
                      AUTO dimensioning. Default is 0.
              AUTO:-  Select or deselect AUTOMATIC mode.
              D-M-S:- Select degree-minute-second style output 
                      for angular dimensioning.
              TOLER:- Tolerances may be defined in LIMIT or 
                      BILATERAL form.
