#assuming nw,ne,se,sw are convex and clockwise
sub c{
my($x0,$y0,$x1,$y1,$x2,$y2) = @_;
$x0 -= $x2;
$x1 -= $x2;
$y0 -= $y2;
$y1 -= $y2;
return $x1*$y0 > $x0*$y1;
}
unless( c(@nw,@ne,@find)
&& c(@ne,@se,@find)
&& c(@se,@sw,@find)
&& c(@sw,@nw,@find)
){
die "data is outside of the quadrant\n";
}
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