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From: smc@hwee.UUCP (Stephen McGowan)
Newsgroups: comp.lang.c
Subject: Turbo-C graphics pages!!!
Message-ID: <708@hwee.UUCP>
Date: 20 Feb 90 12:29:11 GMT
Reply-To: smc@hwee.UUCP (Stephen McGowan)
Organization: Heriot-Watt University, Electrical Eng.
Lines: 56




	Anyone out there know about Turbo-C graphics pages?


	I'm using the 0 page (default), but I need to switch to page
	1 to display further information from page 0.

	However, it appears as though I'm not able to address the cursor
	co-ordinates (or more specifically, move the cursor using the
	'gotoxy(x,y)' statement.

	I can only use this facility if I use the 'textmode()' function
	which, obviously, will reset my graphics displays on page 0.

	Funny thing is, I'm able to perform these 'gotoxy' calls if I remain
	on page 0. However, this has the drawbaxck that it overwrites my
	graphics displays.

	So, are the 2 graphics pages (0 and 1) exactly the same? Do they
	inherit each other's attributes? Is page 0 capable of handling
	both text and graphics simultaneously, whereas page 1 can only
	support one mode? (as appears to be the case).

	To give you some idea of what I want to do, here's a brief
	decription:

	Page 0 contains a 256*256 pixel image of a three-dimensional vision
	scan. I would like to incorporate a facility where the user can move
	the mouse pointer over a particular horizontal image line, press
	a mouse button and have the 256 data values for that horizontal
	line displayed on the screen. As and when the values for this line
	have been displayed, I want to use the mouse to select further data
	lines - this is achieved by letting the user move the mouse up and
	down. As they do so, a counter which is displayed on the screen
	in the same position (hence the need for the 'gotoxy') is continually
	updated to reflect the mouse movements; that is, the counter is
	incremented or decremented between 0 and 255. The subsequent data
	values are all displayed at the same screen positions (again the
	need to use 'gotoxy').

	Well this is what I'd like to do, but am having problems with
	page 1 attributes.

	So does anyone out there have any ideas on what to do, or can
	possibly answer a few of the questions raised?


	Thanks.

	Steve McGowan.  (email smc@uk.ac.hw.ee)


	
	of page 0, I woul