add check to make sure sampling of curve is clock-wise

mostly useful when resampling an entire data set to make sure sampling is the same direction

ReSampleCurve.m

@@ -20,6 +20,10 @@
 [n,T] = size(X);
 del = zeros(1,T);
 del(1) = 0;
+tst = X(:,2)-X(:,1);
+if tst(1) < 0
+    X = fliplr(X);
+end
 for r = 2:T
     del(r) = norm(X(:,r) - X(:,r-1));
 end