In this form of animation, you can specify objects that have independently
controllable velocities and accelerations in the X and Y directions.
Components can still sequence.

The variables that control this motion are located in the AnimOb structure
and are called:

  * YVel, XVel--the velocities in the y and x directions. These
    values are added to the position values on each call to Animate()
    (see below).

  * YAccel, XAccel--the accelerations in the xa nd y directions.
    These values are added to the velocity values on each call to
    Animate() (see below).  The velocity values are updated before the
    position values.

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