
HELP:
(*) PIE-CHART PLOT accepts data for plotting both from keyboard input
    and from a saved data file written by PIE-CHART PLOT.
(*) 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" and a brief
    explanation will be displayed on the "help:" line. To find out more on
    the AC, enter "HELP AC/ALL" "HELP AC/MORE" or "HELP AC/FULL".
(*) To enter data from keyboard, use dialogue fields PI and NO in the menu.
(*) Only the setup parameters of one pie (numbered in NO field) is displayed
    on screen at a time. To scan the rest of pies, press PF1 or PF3 or enter 
    "LIST" or "NO=N" where N is the pie number to be displayed.
(*) 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 get a description of the dialogue commands, enter "HELP COMMANDS".
(*) To start the actual plotting on screen, simply to hit the return key.

COMMAND:
Auxiliary dialogue commands for PIE-CHART PLOT:

EXIT, QUIT      : Exit or quit from the dialogue menu.
PF2, HELP AC/keyword: Invoke the on-line help on a keyword or an AC.
PF1, DOWN       : Step active pie number pointer down by one.
PF3, UP         : Step active pie number pointer   up by one.
LIST            : List all all parameters of all pies entered.
REFRESH         : Refresh the dialogue menu if necessary.
RESET           : Reset graph to the default setup.
SAVE    filename: Save current plot in a pie-chart file.
PF4, DCL command: Spawn a system subprocess.
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 pie from the input list.

MENU:
0: Exit to the main menu.
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.

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:
Pie 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 pie sizes. A non-zero value for x or y suppresses auto-positioning.

PT:
Pie hatching pattern table:

      0> hatching off, hollow pie 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 pie:

     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 pie.
By default, pies 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.
