[PyOpenGL-Users] small bug: tkScale() and `distance' < 0

[Maciej K. <ma...@dg...>]

There's a small bug/feature in the Opengl class' tkScale() method.  There is no
guarantee that "0.01 * (event.y - self.ymouse)" will be < 1... in fact, if you
move the mouse fast enough, it is possible for it to be larger than 1, giving
`scale' < 0.  This causes the eye point to whip past the centerpoint (i.e., the
point being looked at) and look at it from behind.

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