+
+void graph_bezier_linear_to_cubic(double x0, double x3, double *x1, double *x2) {
+ *x1 = (x3 + 2.0*x0)/3.0;
+ *x2 = (2.0*x3 + x0)/3.0;
+}
+
+void graph_bezier_qudratic_to_cubic(double x0, double x3, double *x1, double *x2) {
+ *x2 = (x3 - x0)/3.0 + (*x1);
+ *x1 = (x0 - 3.0*(*x1))/2.0;
+}