Re: Maze game, two problems regarding painting

Hi, if you've read my other thread "Which class should handle the request
to open a file" you might know that I'm making a simple game where the
user controls a character that needs to find its way out of a maze
(doc/view, sdi, MSVC++ 2008).
The game is tile based and mazes are always 20*20 tiles. The document
class holds a 2D-array of pointers to tile objects. There are a few
different types of tiles and each tile knows how to draw itself (meaning
each tile class has a draw() function that takes a CDC *).
I have two problems:
First problem: I don't want to redraw every tile all the time, only the
tiles that have changed which means that when the player enters or leave a
tile, that tile should be redrawn. Right now I have solved that by letting
the tiles know about the view class and they call InvalidateRect() on it.
It works, but I would like to remove that association.

Second problem: When the view needs to draw itself again, should I get a
tile array from the document and call draw on each tile or should it call
a function in the document class that calls draw on each tile? That would
basically mean I introduce a draw function in the document, heh. But it
also means that the view doesn't have to know about the tile class. How
should I do it?

Hope I made some sense.