text: /*
   * Copyright 2012 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  #ifndef SkPathOpsLine_DEFINED
  #define SkPathOpsLine_DEFINED
  
  #include "SkPathOpsPoint.h"
  
  struct SkDLine {
      SkDPoint fPts[2];
  
      const SkDPoint& operator[](int n) const { SkASSERT(n >= 0 && n < 2); return fPts[n]; }
      SkDPoint& operator[](int n) { SkASSERT(n >= 0 && n < 2); return fPts[n]; }
  
      void set(const SkPoint pts[2]) {
          fPts[0] = pts[0];
          fPts[1] = pts[1];
      }
  
      static SkDLine SubDivide(const SkPoint a[2], double t1, double t2) {
          SkDLine line;
          line.set(a);
          return line.subDivide(t1, t2);
      }
  
      double exactPoint(const SkDPoint& xy) const;
      static double ExactPointH(const SkDPoint& xy, double left, double right, double y);
      static double ExactPointV(const SkDPoint& xy, double top, double bottom, double x);
      double isLeft(const SkDPoint& pt) const;
      double nearPoint(const SkDPoint& xy, bool* unequal) const;
      bool nearRay(const SkDPoint& xy) const;
      static double NearPointH(const SkDPoint& xy, double left, double right, double y);
      static double NearPointV(const SkDPoint& xy, double top, double bottom, double x);
      static bool NearRay(double dx1, double dy1, double dx2, double dy2);
      SkDPoint ptAtT(double t) const;
      SkDLine subDivide(double t1, double t2) const;
  
      void dump() const;
  private:
      SkDVector tangent() const { return fPts[0] - fPts[1]; }
  };
  
  #endif
  