Abstract
A method for generating an interpolation closed G 1 arc spline on a given closed point set is presented. For the odd case, i.e. when the number of the given points is odd, this paper disproves the traditional opinion that there is only one closed G 1 arc spline interpolating the given points. In fact, the number of the resultant closed G 1 arc splines fulfilling the interpolation condition for the odd case is exactly two. We provide an evaluation method based on the arc length as well such that the choice between those two arc splines is made automatically. For the even case, i.e. when the number of the given points is even, the points are automatically moved based on weight functions such that the interpolation condition for generating closed G 1 arc splines is satisfied, and that the adjustment is small. And then, the G 1 arc spline is constructed such that the radii of the arcs in the spline are close to each other. Examples are given to illustrate the method.
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