The trick is no not redraw the neighboring tiles in whole, but just the parts that overlap with your current tile. Then they won't mess *their* neighboring tiles.
On Sun, Jun 16, 2013 at 1:19 PM, Andrew Barlow <andrew.bar...@gmail.com> wrote: > Hello, > > I have a fairly frustrating problem I am trying to solve. It's pretty > complicated to explain, so I'll do my best. > > I am trying to use the depth effect of StarPusher > (http://inventwithpython.com/blog/2011/06/13/new-game-source-code-star-pusher-sokoban-clone/) > to make my own game. I'm not using their code exactly, just the method of > blitting images in a grid, where the images are taller than the grid to > create depth. However, I wish to use large maps (60x60 tiles) which means > that iterating over the entire dict of tiles each frame takes a long time to > blit. > > Of course, I could only redraw the map when I need to, but this means that I > couldn't have units of tiles animated as I'd have to draw the whole map each > frame of animation (which is SLOW). I'd like to be able to simply pick a > tile from the dict and call a render method on it, and it only blit that > tile (or nesc. area). The problems come when trying to render just a single > tile due to a unit moving onto it (or appearing and disappearing in my > case). > > One solution may just be to blit the entire column if anything in that > column has changed, but if I have a unit in every column animating, I may as > well just redraw the entire map each frame, which takes AGES. > > At the moment I'm trying: > > Draw the originally rendered map with unit onto the tile and the tile below > Draw the unit onto the tile > Draw any unit onto the tile below > > However, this doesn't work as the first tile's head gets left behind. If I > then extend the first erase to cover the head, I lose the feet of any unit > standing in the tile above! > > I know all this sounds a bit weird, but its very hard to explain without > seeing it in action. > > The code is fairly big (about 5 files of python, 500 lines max) of > unfinished code. It can be downloaded from here; > https://dl.dropboxusercontent.com/u/8301679/BlttingIssue.zip > > I hope I've vaguely explained it - maybe its simply not possible trying to > do what i'm trying to do - but some advise would be hugely welcome! > > Cheers, > > Andy -- Radomir Dopieralski, http://sheep.art.pl
