GP: Flipping a point across a line: possible answers

[Kamel Serend <kamel@nolimits.co.uk>]

Hello Matt

I have not learned how to do it, but I would say that if your line has a
directing vector defined as v ( a,b )
you could use the vector normal to this line v'( -b,a ), compute the
intersection I of the new line passing through your point P
with the original one, then you define the PI vector, a simply translate
the co-ordinates of P by 2*PI.
That is my first guess.
Another method would maybe involve transforming the "miror" line into
one of the major axis and the P point into a P' one using the same
transformation, compute the mirroring P'' and use the inverse of the
transformation to find the real transformed co-ordinates of P thanks to
the line, but I do not want to get involved in such calculations.

Tell me if that helps. 

Kamel.



Eudoxus3 wrote:
> 
> Hello peeps,
> 
> Would anyone happen to know how to calculate the reflected coordinates of
> a point, on one side of a line, to the other.
> 
> Regards,
> 
> Matt. W.
> --
> ***  eudoxus@freeuk.com  ***  http://members.xoom.com/eudoxusM/
>                  mwebster@apsoft.co.uk
> 
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