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

[Mike C. F. <mcf...@ro...>]

Okay, I just fixed this one.  I didn't do anything fancy, just limited 
total scaling to within 1:1000 through 1000:1 of current scale.  I'm 
unable to provoke the situation of pushing past the focus point with the 
current code, though I could imagine having it occur just through 
successively scaling in so that the scale just disappears entirely (i.e. 
the floating-point value becomes so small as to be effectively 0), but 
if you're zooming in that far, well, expect problems.

Enjoy all,
Mike

Maciej Kalisiak wrote:

>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.
>  
>
_______________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://members.rogers.com/mcfletch/