D. - Demo Files
The C-PLOT distribution includes several standard demonstration files showing the program's capabilities. This section includes samples of the graphics they produce, along with the contents of the command files used to make the graphics. Users may find it helpful to review these files as an aid to understanding the operation of C-PLOT's command file facility.
The sample plots here were made using C-PLOT's PostScript filter.
Each of these command files uses graphics filter
z commands
to draw the plots.
You can produce the graphics on your own display
device or printer by initializing the appropriate graphics filter
using the
zi command.
To display output on a pen plotter, first
issue the
in command to initialize the plotter, then type
ch p,
which instructs C-PLOT to translate the
z commands to pen-plotter
p commands.
Each command file begins with
zeq9999w followed by a blank line.
If you haven't already initialized a filter with the
zi
command,
the blank line will cause the default filter to be used.
The
e erases the current plot.
The
q sets quiet mode.
(Quiet mode
is necessary with certain display devices, such as a video terminal
on a serial interface, to prevent the plot program's text stream from
mingling with the filter program's graphics stream.
When plots are
directed to the pen plotter, quiet mode has no effect.)
The
9999 resets the colors in the graphics filter.
The
w causes the filter
to wait for more plotting instructions before restoring text mode
or printing the page.
Each command file also issues a reset command,
re, at the beginning
to put the plot program into a standard state.
An additional command
file,
doall,
will run all the demos consecutively.
- D.1. - Plane curves
D.2. - Psychedelic patterns
D.3. - Fourier transforms
D.4. - Contour plots
D.5. - contour
D.6. - Feature demo
D.7. - USA map
D.8. - Mathematical text
D.9. - Forests
D.10. - Pen numbers