OpenEuphoria

Re: mathmatical question..

• Posted by Lucius L Hilley III <luciuslhilleyiii at JUNO.COM> May 29, 1997
• 953 views

Jiri's Reply has SOME merit mathmatically.
However it is only 50% accurate.

EXAMPLE

  ________
 |  _     |
 | / |    |
 |/  |    |
 .   |____|
/|\
 |
[point]

If you take this polygon.
You click to where his check comes exactly
across the point. This would cause an odd count
and still be inside the polygon.

The easiest way is David Gay's suggestion.

Next!!! to do it mathmatically you would
have break the polygon into triangles.
Then you could use Jiri's idea accurately.
You would check each triangle as a seperate
polygon. If it is within or on any of the
triangles thin it is within or on the polygon.

Triangled view

  ________
 |  /|   /|
 | / |  / |
 |/  | /  |
     |/___|


--Lucius Lamar Hilley III
--  E-mail at luciuslhilleyiii at juno.com
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