ttg "Talk to gaw" is intended to let your application controls gaw with
command lines send over a socket. To enable this you need to run gaw with a
port number, and use the same port in your application :
gaw -p 1946.

For each line sent, gaw echo back a line feed or an error message and can be
used for synchronization, if needed.

In directory ttg, you can find an example C program and an example Perl program
talking to gaw.

Using this method, it is possible to add a column of data to a previosly
loaded array of data.

Here are the keywords used to send commands.

table_new tblname          # add a new wavetable = set of dataset
    variables v0 v1 v2 ... vn     #  define variable names
    vartype   t0 t1 t2 ... tn     # define type for variable

    rowdatas
    d0 d1 d2 ... dn      # implicit row 0
    .  .  .  
    d0 d1 d2 ... dn      # implicit row n
    enddata 
    
    coladd varname vartype   # add a new col
    coldatas varName         # new data for variable varName 
      d0
      .
      dn
    enddata 
    
    dataset name1          # add a new dataset

enddata                    # finishing enter datas

tabledel tblname           # delete the table

table_set table0           # set table as curent
table_new table1

panel 4                    # set gaw to display 4 panels
panel +2                   # set gaw to display 2 more panels

copyvar v1 p0              # display var <varname> in panel 0, automatic color selection
copyvar v1 p0 #rrggbb      # display var <varname> in panel 0 with color (rr, gg, bb are 2-digit hex numbers)
copyvar v1 p0 #rrggbbaa    # display var <varname> in panel 0 with color and alpha transparency
                           # (rr, gg, bb, aa are 2-digit hex numbers)

delvar  v1 p0              # undisplay this wave form
coladd varname vartype     # add a variable column to the current set
coldatas varName           # new data for variable varName

load file format           # load an existing file
export_img file format     # export displayed panels to image file
export_data file format    # export displayed data to data file
color_bg #color            # set background color in drawing areas
grid  on/off               # turn grid on or off
logx  on/off               # set logx scale