New api methods.

utils/curve/splines.py

@@ -32,6 +32,11 @@ def from_points(cls, points, metric=None, is_cyclic=False):
         spline = CubicSpline(points, metric=metric, is_cyclic=is_cyclic)
         return SvSplineCurve(spline)
 
+    @classmethod
+    def from_2d_points(cls, xs, ys):
+        spline = CubicSpline.from_2d_points(xs, ys)
+        return SvSplineCurve(spline)
+
     def evaluate(self, t):
         v = self.spline.eval_at_point(t)
         return np.array(v)

utils/geom.py

@@ -370,6 +370,13 @@ def calc_cubic_splines(tknots, n, locs):
     def create(cls, vertices, tknots = None, metric = None, is_cyclic = False):
         return CubicSpline(vertices, tknots=tknots, metric=metric, is_cyclic=is_cyclic)
 
+    @classmethod
+    def from_2d_points(cls, xs, ys):
+        vertices = np.zeros((len(xs), 3))
+        vertices[:,0] = np.array(xs)
+        vertices[:,1] = np.zrray(ys)
+        return CubicSpline(vertices, metric='X', is_cyclic=False)
+
     def eval(self, t_in, tknots = None):
         """
         Evaluate the spline at the points in t_in, which must be an array