Boxline in curses ( Linux )

[M.Senthil Kumar]

hai all,
I need a help from you. I 'm working in a project using "curses.h" in
Linux using 'C'. I have some doughts regarding menus and line.
1. I used to draw box in window using ACS_HLINE,ACS_VLINE. But what
happened is, the line is not a straight line. Instead of that it look
continus hypen ( - ) for HLINE and continuous ( | ) for VLINE.
I'm using curses version : 5.3.20030118 came along with RedHat 9.0 .
Please tellme how to draw straight line. ( It is working correctly
in version : 5.2.20020406 come along with RedHat 7.3 )

thanks,
Senthil kumar.M

[Jack Klein]

On 20 Feb 2004 22:03:02 -0800, ms*********@rediffmail.com (M.Senthil
Kumar) wrote in comp.lang.c:

hai all,
I need a help from you. I 'm working in a project using "curses.h" in
Linux using 'C'. I have some doughts regarding menus and line.
1. I used to draw box in window using ACS_HLINE,ACS_VLINE. But what
happened is, the line is not a straight line. Instead of that it look
continus hypen ( - ) for HLINE and continuous ( | ) for VLINE.
I'm using curses version : 5.3.20030118 came along with RedHat 9.0 .
Please tellme how to draw straight line. ( It is working correctly
in version : 5.2.20020406 come along with RedHat 7.3 )

thanks,
Senthil kumar.M

This group discusses the standard C language, which does not include
third party libraries and extensions like curses.

For Linux programming, ask in news:comp.os.linux.development.apps.

--
Jack Klein
Home: http://JK-Technology.Com
FAQs for
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[nrk]

M.Senthil Kumar wrote:

hai all,
I need a help from you. I 'm working in a project using "curses.h" in
Linux using 'C'. I have some doughts regarding menus and line.
1. I used to draw box in window using ACS_HLINE,ACS_VLINE. But what
happened is, the line is not a straight line. Instead of that it look
continus hypen ( - ) for HLINE and continuous ( | ) for VLINE.
I'm using curses version : 5.3.20030118 came along with RedHat 9.0 .
Please tellme how to draw straight line. ( It is working correctly
in version : 5.2.20020406 come along with RedHat 7.3 )

thanks,
Senthil kumar.M

Your question is not topical in this group as we primarily discuss the C
language as described in the ANSI/ISO standards. Here are some groups
where you might find better guidance:

comp.unix.programmer
comp.os.linux.development.apps
comp.os.linux.development

Please do read their FAQs before posting though. You can find the FAQ for
comp.lang.c at:
http://www.eskimo.com/~scs/C-faq/top.html

-nrk
--
Remove devnull for email

[Derk Gwen]

# 1. I used to draw box in window using ACS_HLINE,ACS_VLINE. But what
# happened is, the line is not a straight line. Instead of that it look
# continus hypen ( - ) for HLINE and continuous ( | ) for VLINE.

An inherent aspect of curses is that it is intended to draw only ASCII
character on a rectangular grid on a terminal or terminal emulator. If
you want fancier graphics, you're going to need X-Windows or OpenGL.
X-Windows should be available on most Linux installs.

--
Derk Gwen http://derkgwen.250free.com/html/index.html
Death is the worry of the living. The dead, like myself,
only worry about decay and necrophiliacs.

[Malcolm]

"Derk Gwen" <de******@HotPOP.com> wrote in message

An inherent aspect of curses is that it is intended to draw only ASCII
character on a rectangular grid on a terminal or terminal emulator. If
you want fancier graphics, you're going to need X-Windows or
OpenGL.
X-Windows should be available on most Linux installs.

ASCII characters are basically Latin alphanumerics, a bit of punctuation,
and a few non-printed controls. However most terminals have an extended
8-bit character set, the ANSI set, which includes characters designed for
simple boxes and menus and the like. I would be surprised if curses doesn't
support these.

[August Derleth]

Malcolm wrote:

"Derk Gwen" <de******@HotPOP.com> wrote in message

An inherent aspect of curses is that it is intended to draw only ASCII
character on a rectangular grid on a terminal or terminal emulator. If
you want fancier graphics, you're going to need X-Windows or
OpenGL.
X-Windows should be available on most Linux installs.

ASCII characters are basically Latin alphanumerics, a bit of punctuation,
and a few non-printed controls. However most terminals have an extended
8-bit character set, the ANSI set, which includes characters designed for
simple boxes and menus and the like. I would be surprised if curses doesn't
support these.

ANSI characters can be drawn, but once you set the high bit you lose
portability to systems that don't support ANSI. The DOS terminals come
to mind, as they still have graphical characters in the `extended ASCII'
codepoints. Which is a fairly dumb idea in this day and age, but, then,
so's DOS.

--
My address is yvoregnevna gjragl-guerr gjb-gubhfnaq guerr ng lnubb qbg pbz
Note: Rot13 and convert spelled-out numbers to numerical equivalents.

[Derk Gwen]

"Malcolm" <ma*****@55bank.freeserve.co.uk> wrote:
#
# "Derk Gwen" <de******@HotPOP.com> wrote in message
# > An inherent aspect of curses is that it is intended to draw only ASCII
# > character on a rectangular grid on a terminal or terminal emulator. If
# > you want fancier graphics, you're going to need X-Windows or
# > OpenGL.
# > X-Windows should be available on most Linux installs.
# >
# ASCII characters are basically Latin alphanumerics, a bit of punctuation,
# and a few non-printed controls. However most terminals have an extended
# 8-bit character set, the ANSI set, which includes characters designed for
# simple boxes and menus and the like. I would be surprised if curses doesn't
# support these.

curses was originally written when signedness of C char was subject to
speculation; only codes 0 through 127 could be used portably; and those
were the only available codes on the terminals then targetted. Programs
like vi did (do?) use the extra bit for other purposes. I don't know how
curses has evolved: I wouldn't trust it with codes 128 through 255 without
clear documentation that it could handle those.

Also codes 128 through 255 have wildly different interpretations on
different machines, a chaos slowly being colonised with Unicode.

--
Derk Gwen http://derkgwen.250free.com/html/index.html
OOOOOOOOOO! NAVY SEALS!

[Richard Bos]

Derk Gwen <de******@HotPOP.com> wrote:

"Malcolm" <ma*****@55bank.freeserve.co.uk> wrote:
#
# "Derk Gwen" <de******@HotPOP.com> wrote in message
# > An inherent aspect of curses is that it is intended to draw only ASCII
# > character on a rectangular grid on a terminal or terminal emulator. If
# > you want fancier graphics, you're going to need X-Windows or
# > OpenGL.
# > X-Windows should be available on most Linux installs.
# >
# ASCII characters are basically Latin alphanumerics, a bit of punctuation,
# and a few non-printed controls. However most terminals have an extended
# 8-bit character set, the ANSI set, which includes characters designed for
# simple boxes and menus and the like. I would be surprised if curses doesn't
# support these.

curses was originally written when signedness of C char was subject to
speculation; only codes 0 through 127 could be used portably;

This is still true. Plain char may be either signed or unsigned. OTOH,
on the systems where curses is available, it's likely to be signed.

Richard