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Jim Adams
Co-Designer 'The Light Befallen'
tcm@pobox.com
http://www.lightbefallen.com

If, however, you want to make a large map without actually copying a giant picture into memory, it is somewhat more complicated:
1. You need your map stored in some type of 2d array.
2. Let's say your tiles are 32x32, and you are working in 640x480.
3. You need a back buffer that is screenwidth + 2 tiles x screenheight + 2 tiles.
4. You need to variables to hold the pixel-offsets into that backbuffer.
5. Now, you increase only the pixel offsets, and use them for where to blit from. If a pixel offset becomes greater than 64 or less than 0, you just redraw the map in the buffer one tile to the left or right.

This worked just fine for me, so don't go messaging me saying "this and this bla bla bla won't work cause bla bla bla!"

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Visit the homepage of my (soon to be 'net multiplayer) Tank Game at http://members.home.net/chris-man