Re: A newbie has problems with Lua

["Joe Smith" <unknown_kev_cat@...>]

"Cadé David" <codename_68@hotmail.com> wrote in message 
BAY107-F2114C15FA9C19A38414A92944E0@phx.gbl">news:BAY107-F2114C15FA9C19A38414A92944E0@phx.gbl...
> > From: "Joe Smith" <unknown_kev_cat@hotmail.com>
> > Reply-To: Lua list <lua@bazar2.conectiva.com.br>
> > To: lua@bazar2.conectiva.com.br
> > Subject: Re: A newbie has problems with Lua
> > Date: Mon, 14 Aug 2006 12:15:11 -0400
> >
> >
> > "Vegetable" wrote in message 5795533.post@talk.nabble.com">news:5795533.post@talk.nabble.com...
> >
> > The error come in
> > > function draw_map()
> > >        for i=0,map_size_x-1 do
> > >                for j=0,map_size_y-1 do
> > >
> > > tex_draw(abs(map[i][j]),(i-x_map)*32,(j-y_map)*32,1)
> > >                end
> > >        end
> > > end
> >
> > That code looks odd...
> >
> > Check that you really want
> > "(i-x_map)" and not "(x_map-i)".
> > Same with y_map.

>x_map and y_map is the position of the tile at the left and the top of the
> screen.

Ok. And I assume i=0, and j=0 is also supposed to place at the top left of 
the screen correct?
0-(top of screen) gives a negative number under normal programing 
co-ordinate systems.
same with 0-(left of screen)

Perhaps I am wrong, but it looks like you will be drawing in places other 
than were you want. If you end up drawing offscreen that could potentially 
be a problem.