Re: gnomecanvas question

[Joe Van Dyk <joevandyk gmail com>]

On Mon, 14 Mar 2005 17:36:25 -0500, Paul Davis
<paul linuxaudiosystems com> wrote:
> >Say I have a 2D space that's potentially very large.  I need to be
> >able to display various player icons on this world (they rotate and
> >move around in this space) and draw a grid on it.
> >
> >Players shouldn't really be limited to a certain area of movement,
> >they should be able to move pretty darned far.  So if I initialize a
> >gnomecanvas that's 1000000x1000000, they could probably move off of
> >that and I'd have to resize the viewable area.
> >
> >And if I initialize a huge world up front and draw grids all over it,
> >the application takes a long time to start.
> >
> >So, what I really need to do is make the world big enough to contain
> >all the players, even when the players move around (the world should
> >expand as the players move away from the center).
> >
> >Ideas on how to properly implement something like this?  Another
> >problem I've run in to is that when the world / viewable area is very
> >large, the scroll bars don't provide very good movement (think
> >scrolling in a million page document or something).
> 
> you haven't provided even close to enough information to really help you.
> 
> is this an AA canvas? how are you drawing the grid?


Yes, AA canvas.

I have a variable that controls how wide (in pixels) each grid square
should be.  I start at the world's mininum x and increment to the
world's maximum x, drawing a line from the world's mininum y to the
maximum y (for vertical lines).  And repeat for horizontal lines.