Re: setscrreg and scrolling

[Bryan Christ]

Scrolling is typically quite fast.  One good example is the MyMan 
project (http://www.geocities.com/bsittler/).

2 suggestions...

IMHO, the best way to do scrolling is to create subwins for all the 
areas of your game that you expect to need scrolling.  Next, set the 
whole subwin to scrollable by simply doing a scrollok(subwin,TRUE). 
Then use the function wscroll() to either scroll the subwin contents up 
or down.

You wont be able to do horizontal scrolling with wscroll().  If you need 
do do that, here's a different approach...

Create a large pad that has the entire contents of your map.  Create a 
window or subwin that the use will actually see (pads are offscreen work 
areas).  Use copywin() to copy the region your pad which you want to 
display in your window or subwin.  When you scroll, you simply adjust 
the coords that you pass in to copywin().  It gives the illusion of 
scrolling but really your are just panning your "viewfinder" window 
across the larger pad.

Bryan

Da-Breegster wrote:
> Hi,
>
> I'm working on several games in Perl with an ncurses interface. One is a
> roguelike, where I need a constantly centered map view. The other is an
> interactive fiction experiment with a scrolling message queue (it displays the
> last X messages). For both I have been manually implementing scrolling, which
> is fine. The actual drawing is done with addstr, addch, attron, and standend.
> (I am using colors) However, on my machine (which is somewhat old, a 500Mhz AMD
> K6 box) the lag is too annoying. Rewriting some parts of the code in C helped
> slightly and profiling has shown that the main problem is that I'm forced to
> completely redraw the window (with rows of messages or a 2D colored grid) every
> move. My algorithm obviously isn't optimal, but it's the best I can think of.
>
> What I'd like is to ask for examples of scrolling with ncurses. I've examined
> Cdk (both versions) and other high-level interfaces without much success. In
> short, how can fast scrolling (with color) be accomplished with ncurses? I've
> read the manpage for setscrreg but can't seem to figure out even a basic way to
> use this. Could anybody please help?
>
> Thanks,
> Breeg
>
> (I would have posted to help-ncurses, but it seemed dead save the spambots.)