remove prototype pathops code

experimental/Intersection/QuadraticLineSegments.cpp

-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#include "QuadraticLineSegments.h"
-
-// http://cagd.cs.byu.edu/~557/text/cagd.pdf 2.7
-// A hodograph is the first derivative curve
-void hodograph(const Quadratic& quad, _Line& hodo) {
-    hodo[0].x = 2 * (quad[1].x - quad[0].x);
-    hodo[0].y = 2 * (quad[1].y - quad[0].y);
-    hodo[1].x = 2 * (quad[2].x - quad[1].x);
-    hodo[1].y = 2 * (quad[2].y - quad[1].y);
-}
-
-// A 2nd hodograph is the second derivative curve
-void secondHodograph(const Quadratic& quad, _Point& hodo2) {
-    _Line hodo;
-    hodograph(quad, hodo);
-    hodo2.x = hodo[1].x - hodo[0].x;
-    hodo2.y = hodo[1].y - hodo[0].y;
-}
-
-// The number of line segments required to approximate the quad
-// see  http://cagd.cs.byu.edu/~557/text/cagd.pdf 10.6
-double subDivisions(const Quadratic& quad) {
-    _Point hodo2;
-    secondHodograph(quad, hodo2);
-    double dist = sqrt(hodo2.x * hodo2.x + hodo2.y * hodo2.y);
-    double segments = sqrt(dist / (8 * FLT_EPSILON));
-    return segments;
-}