Math Help?

Devin Asay devin_asay at
Fri Apr 30 15:15:46 EDT 2010

Hi Scott,

On Apr 30, 2010, at 1:05 PM, Scott Rossi wrote:

> Hello List:
> Was wondering if those with more comprehensive math skills than I know how
> to determine if one point X,Y falls within a triangular region defined by 3
> points X1,Y1, X2,Y2, X3,Y3.  Thanks for any suggestions.

I don't know from math, but I do know you can use the within() function, as opposed to the 'is within' operator, to test for "within-ness" of non-rectangular objects. For instance, if you have an opaque, 3-sided polygon graphic, within() will only be true if the point you're testing is inside the filled part of the triangle.

I'm sure some real math expert would have a "real math" solution.



Devin Asay
Humanities Technology and Research Support Center
Brigham Young University

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