Re: Problems with chgat-family of functions

[Thomas Dickey]

On Wed, 31 May 2006, Sadrul H Chowdhury wrote:

> Hi. I am trying the following piece of code:
>
> /***************************** start of code *****************************/
> #include <ncurses.h>
>
> int main()
> {
>       WINDOW *w;
>
>       initscr();
>       start_color();
>
>       box(stdscr, 0, 0);
>
>       mvwchgat(stdscr, 0, 0, 6, A_BLINK, 1, NULL);

chgat() doesn't mark the text as altered.
I agree that it would be nice, but other implementations appear to agree.
You'll have to use touchline or touchwin to get the effect you want.

>       wrefresh(stdscr);
>
>       w = newwin(5, 5, 10, 10);
>       box(w, 0, 0);
>       mvwchgat(w, 0, 0, -1, A_BLINK, 1, NULL);
>       wrefresh(w);
>       getch();
>
>       mvwchgat(stdscr, 0, 8, 6, A_BLINK, 1, NULL);
>       wrefresh(stdscr);
>       getch();
>
>       endwin();
>
>       return 0;
> }
>
> /***************************** end of code *****************************/
>
> The changes after the first getch() doesn't seem to do anything. Is there
> something I need to do to show the update on the screen?
>
> Also, the call to `box` shows a nice proper rectangular box. But when I do
> chgat on them, they show up as ascii chars (eg. l,q,k,x etc). Is there any
> way I can chgat and still show the nice straight-line characters?

Line-drawing is an attribute.  If you change the attributes so 
line-drawing isn't in effect, you'll see the mapping characters.

> Thanks.
> Sadrul

--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net