1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
Plotter Control (obsolete)
--------------------------
.. function:: lw
Name:
lw - laser writer graphical output (or HP pen plotter)
Syntax:
``h.lw(file)``
``h.lw(file, device)``
``h.lw()``
Description:
``h.lw(file, device)`` opens a file to keep a copy of subsequent
plots (*file* is a string variable or a name enclosed in double
quotes). All graphs which are generated on the screen are saved in
this file in a format given by the integer value of the *device* argument.
*device* =1
Hewlett Packard pen plotter style.
*device* =2
Fig style (Fig is a public domain graphics program available
on the SUN computer). The filter ``f2ps`` translates fig to postscript.
*device* =3
Codraw style. Files in this style can be read into the
PC program, ``CODRAW``. The file should be opened with the extension,
``.DRA``.
Lw keeps copying every plot to the screen until the file is closed with
the command, ``h.lw()``. Note that erasing the screen with ``h.plt(-3)`` or
a :kbd:`Control-e` will throw away whatever is in the file and restart the file at the
beginning. Therefore, ``lw`` keeps an accurate representation of the
current graphic status of the screen.
After setting the device once, it remains the same unless changed again
by another call with two arguments. The default device is 2.
Example:
Suppose an HP plotter is connected to serial port, ``COM1:``. Then
the following procedure will plot whatever graphics information
happens to be on the screen (not normal text).
.. code-block::
none
from neuron import h, gui
import os
# function for hp style plotter
def hp():
h.plt(-1)
h.lw()
os.system("cp temp com1:")
h.lw("temp")
h.lw("temp", 1)
Notice that the above procedure closes a file, prints it, and then
re-opens :file:`temp`. The initial direct command makes sure the
file is open the first time hp is called.
.. warning::
It is often necessary to end all the plotting with a ``h.plt(-1)``
command before closing the file to ensure that the last line drawing
is properly terminated.
In our hands the the HP plotter works well at 9600 BAUD and
with the line ``\verb+MODE COM1:9600,,,,P+`` in the autoexec.bat file.
.. seealso::
:func:`plot`, :func:`graph`, :func:`plt`
|
