Movement of Single Objects
Object movement is approximated by a sequence of linear movements.
Each movement represented as an iso-directional-interval
(d,r,I)
- I is a time interval
(during which object moves in constant direction)
- d is distance moved during I
(a real number)
- r is the direction moved
(one of N, NE, E, SE, S, SW, W, NW)
A track is:
[
(d1,r1,I1),
(d2,r2,I2),
...
(dn,rn,In)
]
where
finish(I1) = start(I2),
finish(I2) = start(I3),
...
(i.e. intervals are contiguous)
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