Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!tut.cis.ohio-state.edu!bloom-beacon!eru!luth!sunic!infovax!bl
From: bl@infovax.UUCP (Bj|rn Larsson)
Newsgroups: comp.sys.ibm.pc
Subject: Re: pccurses v1.3 mvwin() problem
Message-ID: <306@infovax.UUCP>
Date: 11 Nov 89 21:44:20 GMT
References: <16679@dartvax.Dartmouth.EDU>
Reply-To: bl@infovax.UUCP (Bj|rn Larsson)
Organization: Infovox AB, SOLNA, Sweden
Lines: 75

In article <16679@dartvax.Dartmouth.EDU> pete@othello.dartmouth.edu (Pete Schmitt) writes:
>The following code works correctly on BSD.  It rotates three small windows
>that everlap each other.  But under pccurses (compiled with Turbo-C 1.5)
>the three small windows don't move from the upper left corner of the screen.
>Does anyone have this working?
> (program example deleted)
It should be made clear that PCcurses is a port of Pavel Curtis' PD curses
package by the name of 'ncurses'. In the documentation about Ken Arnold's
original curses, it says about overlay(win1, win2):

'Overlay win1 on win2. The contents of win1, insofar as they fit, are
placed on win2 at their starting (x,y) coordinates...'

However, the ncurses documentation says on the same topic:

'These functions overlay win1 on top of win2, that is, all text in win1
is copied to win2, after lining up the two window's origins...'
		    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I think this verifies the pccurses does the 'right' thing considering
its heritage. On the other hand, this way of working appears rather
useless to me... and should be easy to fix.

Interestingly, I test compiled the submitted programming example on our
Ultrix (~BSD) machine, and  the windows were placed as the author intended,
but they were not displayed in full - only the left and upper borders were
visible.

Below is a modified version of the example, which works with pccurses.
It produces the desired display without using overlay(), but requires
3 WIN structs, plus the storage to hold the lines of the new windows.
It's not a solution, but an alternative. And BTW, it works on Ultrix
curses...

================================================================
#include <curses.h>

main()
{
	WINDOW *win1;
	WINDOW *win2;
	WINDOW *win3;
	int i;

	initscr();
	box(stdscr,'*','-');
	refresh();
	sleep(2);
	win1 = newwin(10, 20, 3, 3);
	win2 = newwin(10, 20, 5, 7);
	win3 = newwin(10, 20, 7, 11);
	for(i=1;i<10;i++)
	box(win1,'*','*');
	box(win2,'.','.');
	box(win3,'+','+');
	while(1)
	  {
	  touchwin(win1);
	  wrefresh(win1);
	  sleep(1);
	  touchwin(win2);
	  wrefresh(win2);
	  sleep(1);
	  touchwin(win3);
	  wrefresh(win3);
	  sleep(1);
	  }
	endwin();
}
================================================================
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