code: function(p0, p1, p2, p3) {
  
              console.warn('deprecated');
  
              var curve = new Curve(p0, p1, p2, p3);
  
              return function solveInversion(p) {
  
                  return curve.closestPointT(p);
              };
          }
docs: Solves an inversion problem -- Given the (x, y) coordinates of a point which lies on a parametric curve x = x(t)/w(t), y = y(t)/w(t), ﬁnd the parameter value t which corresponds to that point. @deprecated @param control points (start, control start, control end, end) @return a function that accepts a point and returns t.