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some geometry questions. [message #48175]

Wed, 29 March 2006 14:58

qian
Messages: 3
Registered: July 2005

Junior Member

Dear IDL users,

If I have 4 random points (x0,y0) (x1,y1), (x3,y3), (x4,y4), is there a
simple way to decide whether one of them is inside of the triangle
formed by the other three points?

If none of them is in the triangle by others, how can I connect them in
order to form a 4 edges polygon, instead of two head on triangles, when
using order 1-2-3-4-1?

like this:
1----2
\ \
4\__\3

not like this:
1-----2
\ /
/\
/ \
3-----4

Thanks,

Qian

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some geometry questions.

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