Tile engine

[Fox]

Say in your scrolling function you have 2 variables, one stores the scrolling offset (intScrollX ?) and one stores the tile offset (intTmpX ?) and a tile size of 20 pixels (must match)...

intScrollX = intScrollX + 1
If intScrollX > 20 then
   'Reset scrolling offset
   intScrollX = 0
   'Adjust tile offset
   intTmpX = intTmpX + 1
Endif

Remember where you draw the map you have to add both offsets to draw it at the correct position:

For A = 0 to MapWidth
For B = 0 to MapHeight
   DrawTile Map(intTmpX,intTmpY), A*TileWidth - intScrollX, B*TileHeight - intScrollY
Next
Next

That's all ..