Re: how to find the two end points in a line ...
"JD" <jdt_young@yahoo.com> wrote in message
news:ravOi.32061$eY.10437@newssvr13.news.prodigy.net...
Hi,
There are about 10+ 3-D points on the same line. I want to find the two
end points from these points. The efficiency is not an issue because there
are only 10 points or so. I just need a cleaner code to do it. Should I
use an STL set to store the distances among them and then retrieve the max
distance from the last element in the set? Then the question is how to
know which points are associated with this max distance? Your help is
appreciated.
Any of the x,y or z coordinates that change will help you. If the x
coordinate changes, just find the point with the min and max x and you have
the end points. x may not change though (if the line runs along the x axis)
then you could use the y or z. You don't really need to do any math, just
detemine which of the 3 coordinates (out of any) that are changing. You
could also sort by some arbitrary method and use the max and min of that
also. The normal method I use for sorting 3d points is in pseudo code:
operator<
if ( x1 < x2 )
return true;
else if ( x1 == x2 )
if ( y1 < y2 )
return true;
else if ( y1 == y2 )
if ( z1 < z2 )
return true;
return false;
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