Re: Needing basic info on print position control

[Stuart Longland <stuartl at longlandclan dot hopto dot org>]

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Andrew Lietzow wrote:
> Dear List,
>
> Newbie looking for info on print position and screen position control.  I
> want the system to display something to an exact location on the
screen, or
> on a printer.
>
> With Business Basic, one says something like:
> print @(20,15) -- for screen control
> and
> print @(20) for position control within the current line -- for print
control
>
	For console (screen) under UNIX, most consoles here understand ANSI
escape sequences.  For example:

	^[[r;cH 	will position your cursor on row r, column C.  The r;c may be
ommitted, in which case, it will place the cursor at the top right hand
corner (row 1, column 1).

	You also have relative controls in ANSI:

	^[[xA	Up x rows
	^[[xB	Down x rows
	^[[xC	Right x columns
	^[[xD	Left x columns

	If x is ommitted, it's assumed to be 1.

	With the above examples, remember to replace ^[ with the ESCAPE
character (ASCII Character 27), so in a printf statement, to go to the
8th row, 20th column, use the following:

	printf("\033[8;20Hwhatever text goes here");

	Or with your example:
	printf("\033[15;20H");

	As for the printer, I think you'll find the backspace (^H) and space
are your friends.  ^H will go back a space, single space will go forward
a space.

	So in your example, make sure there's 15 spaces before your desired
text, like this:

	printf("                    Text starts here");

	Then, say, to go back to column 5, do this: (^H = character 8 or \010)
	printf("\010\010\010\010\010New text starts here");

	There are probably more efficient ways of doing this, this is what I know.
- --
+-------------------------------------------------------------+
| Stuart Longland           stuartl at longlandclan.hopto.org |
| Brisbane Mesh Node: 719             http://stuartl.cjb.net/ |
| I haven't lost my mind - it's backed up on a tape somewhere |
| Griffith Student No:           Course: Bachelor/IT @ Nathan |
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