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Day 5: Areas/filters/furre present

So,  you're hopefully itching to do more advanced stuff.  Cause you get to do powerful things today: Areas, filters, and moving furres present.  This is where the true mind of the programmer comes in.  Ok, now add this to your map outside:
Figure 5-1
Make sure that when you select the water floor, it says "walk:y" below the floor.  If not, it won't work.
Ok, now put this in your ds.
River
(0:100) When 1 seconds have passed, offset by 1,
      (3:4) within the rectangle (12,14) - (16,21),
         (4:8) only where there are no objects,
            (5:81) move any furre present 1 step(s) southeast (down and right) if there's nobody already there.

Now, be sure to set the first position in the rectangle to the top-left corner in the river and the second to the bottom-right.  If you did it right, people should be able to sit on the rock without "drifting".
Ok, that's all for today.