docs: void ensureTriangleOrder(List<Point2D_I32> contour ) {
  		Element<Corner> e = list.getHead();
  		Corner a = e.object;e=e.next;
  		Corner b = e.object;e=e.next;
  		Corner c = e.object;
  
  		int distB = CircularIndex.distanceP(a.index,b.index,contour.size());
  		int distC = CircularIndex.distanceP(a.index,c.index,contour.size());
  
  		if( distB > distC ) {
  			list.reset();
  			list.pushTail(a);
  			list.pushTail(c);
  			list.pushTail(b);
  		}
  	}