third_party/WebKit/Source/platform/animation/CubicBezierControlPoints.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CubicBezierControlPoints_h
   6 #define CubicBezierControlPoints_h
   7
   8 namespace blink {
   9
  10 struct CubicBezierControlPoints {
  11     double x0, y0;
  12     double x1, y1;
  13     double x2, y2;
  14     double x3, y3;
  15
  16     CubicBezierControlPoints()
  17         : x0(0)
  18         , y0(0)
  19         , x1(0)
  20         , y1(0)
  21         , x2(0)
  22         , y2(0)
  23         , x3(0)
  24         , y3(0)
  25     { }
  26
  27     CubicBezierControlPoints(double x0, double y0, double x1, double y1,
  28         double x2, double y2, double x3, double y3)
  29         : x0(x0)
  30         , y0(y0)
  31         , x1(x1)
  32         , y1(y1)
  33         , x2(x2)
  34         , y2(y2)
  35         , x3(x3)
  36         , y3(y3)
  37     { }
  38
  39     void divide(double t, CubicBezierControlPoints& left, CubicBezierControlPoints& right) const;
  40     size_t findTurningPoints(double& left, double& right) const;
  41     bool findIntersection(double intersectionY, double& intersectionX) const;
  42
  43 private:
  44     bool findInflexionPoint(double& solution) const;
  45 };
  46
  47 } // namespace blink
  48
  49 #endif