
HELP:
PIE-CHART PLOT accepts data for plotting both from keyboard input
and from a saved data file written by PIE-CHART PLOT. To enter data 
from keyboard, use dialogue fields PI and NO in the menu.
To read a pie-chart plot created before, enter "F1=filename" or "READ
filename" or "PLOT filename", where filename is the name of plot file.

To edit plot parameters or setup, enter "AC=parameters" where AC is the
two letter Access Code assigned to the parameters (e.g. GT=graph title).
To find out what a particular AC stands for, enter "HELP AC" or "HELP 
AC/ALL" "HELP AC/MORE" or "HELP AC/FULL". Only the setup parameters of 
one slice (numbered in NO field) is displayed on screen at a time. 
To scan the rest of slices, press PF1 or PF3 or enter "LIST" or "NO=N" 
where N is the slice number to be displayed.

Enter "HELP COMMANDS" to get a list of auxiliary command definitions.
Enter "GO" to start plotting on screen.

COMMANDS:
Auxiliary dialogue commands for PIE-CHART PLOT:

EXIT, QUIT        : Exit from Piechart Plot.
GO                : Start plotting on screen.
DOWN or PF1       : Step active slice number pointer down by one.
UP   or PF3       : Step active slice number pointer   up by one.
LIST              : List all all parameters of all slices entered.
REFRESH or MENU   : Refresh the dialogue menu if necessary.
RESET             : Reset graph to the default setup.
SAVE    filename  : Save current plot in a pie-chart file.
READ    filename  : Read a pie-chart file, same as F1=filename.
PLOT    filename  : Read a pie-chart file and plot on screen right away.
LAYOUT  filename  : Use another layout file, same as F4=filename.
DELETE         N  : Delete Nth slice from the input list.
PF4 or DCL command: Spawn a system subprocess.
TIME              : Display the system clock.

MENU:
Following function keys are defined for local branching:

0: Exit from Piechart Plot.
1: Invoke hardcopy making utility.
   If you just get back from auxiliary layout and would like
   to have the changes just made in the layout to show up on
   the hardcopy, redraw the plot before invoking the hardcopy.
2: Invoke auxiliary layout utility.
3: Invoke the dialogue utility.
6: Redraw the plot.
$: Spawn a system subprocess.
PF1: Invoke hardcopy making utility without the page setup menu.
PF2: Invoke this help menu.
PF3: Invoke the dialogue utility.
PF4: Spawn a system subprocess.
RETURN: Invoke the dialogue prompt (PIEPLT>) without the dialogue menu.
     You can perform plot setup just as you would do with the dialogue 
     menu and all auxiliary dialogue commands are executable.


F1:
When you enter a filename for F1, you start a new plot if the file given
exists and is a pie-chart file written by PIE-CHART PLOT, or else it is
taken as a new file to save the current pie-chart plot upon normal exit
from the program. Dialogue command SAVE also allows you to save the plot
to a file in any other filename you prefer. A pie-chart plot file written
by this program is a parameter-keyword-oriented and straightforward ASCII
file you can edit. 

F4:
Auxiliary layout file to overlay and save the layout if you resort to the
auxiliary layout utility of PIE-CHART PLOT to finish the plot. You can use
a different layout file to overlay on the current graph by entering it in
F4. Since only one version of a layout file is maintained by PIE-CHART PLOT,
the file type of a layout file is defaulted to *.DES to prevent you from
losing a non-layout file by mis-entering it in F4. Note that all graphic 
entries in a layout file are recorded in the units of inches. As a result,
if you change the pie size, its layout portion, if any, will not follow.
Therefore make up your mind for the pie size before you go to the layout.

GT:
Graph title (any alphanumeric information, maximum 75 characters).
By default, graph title is centered on graph origin either on top
or at bottom depending on the keyword assigned for parameter TP.
If any other place for graph title or multi-line header is desired,
resort to the auxiliary layout utility of PIE-CHART PLOT where you 
can do labeling anywhere and in any direction you want by moving a 
crosshair cursor.

Following control sequences can be embedded in labeling in PIE-CHART PLOT:

     { --- Convert the next non-blank character to superscript.
     } --- Convert the next non-blank character to subscript.

     \sTEXT_STRING^s  --- TEXT_STRING to be italics.
     \bTEXT_STRING^b  --- TEXT_STRING to be boldface.
     \#TEXT_STRING^p  --- TEXT_STRING to be colored in pen code #.

GO:
Graph origin(x,y) in inches from the lower-left corner of screen and is
referred to by all graph positioning and coordinates. When you move this 
origin, the whole graph moves with it. When it comes to making a hardcopy,
you can also offset a graph for this sake without moving it on the screen.

SF:
Overall graph scale factors (x,y) for screen plotting and they can 
be adjusted independently when it comes to making the hardcopy.

SE:
Screen erase flag effective only on a Tektronix-4100 terminal.
SE=NO allows for saving the previous plots, building a multi-plot screen,
and producing a hardcopy page from it. The multiple plots could be made
from piechart plot as well as from other functional routines such as 
histogram plot, xyplot, etc.

LP:
Slice ID label position (x,y) in inches relative to the graph origin.
Values 0.0,0.0 allow for automatic positioning of the IDs depending
upon slice sizes. A non-zero value for x or y suppresses auto-positioning.

PT:
Slice hatching pattern table:

      0> hatching off, hollow slice assumed.
      1> solid fill (auto-bidirectional. 0.02 inch spacing).
      2> horizontal bidirectional lines (0.04 inch spacing).
      3> horizontal bidirectional lines (0.06 inch spacing).
      4> horizontal bidirectional lines (0.12 inch spacing).
      5>   vertical bidirectional lines (0.04 inch spacing).
      6>   vertical bidirectional lines (0.06 inch spacing).
      7>   vertical bidirectional lines (0.12 inch spacing).
      8>  45 degree bidirectional lines (0.04 inch spacing).
      9>  45 degree bidirectional lines (0.06 inch spacing).
     10>  45 degree bidirectional lines (0.12 inch spacing).
     11> -45 degree bidirectional lines (0.04 inch spacing).
     12> -45 degree bidirectional lines (0.06 inch spacing).
     13> -45 degree bidirectional lines (0.12 inch spacing).
     14>  45 degree bidirectional  dots (0.04 inch spacing).
     15>  45 degree bidirectional  dots (0.06 inch spacing).
     16>  45 degree bidirectional  dots (0.12 inch spacing).

LI:
Line type for drawing the slice:

     1> solid line.              2> dotted line.
     3> 1-dot center line.       4> short-dash line.
     5> long-dash line.          6> 3-dot-center line.
     7> long-short-dash line.    8> sparse short-dash line.

PA:
Angular offset or rotation in degrees to draw the first slice.
By default, slices are plotted in input sequence counter-clockwise
starting from 3 clock position. A positive angular offset rotates
the whole pie from the 3 clock position counter-clockwise and
a negative value clockwise.
