File: cubic_bezier.h

package info (click to toggle)
chromium-browser 41.0.2272.118-1
  • links: PTS, VCS
  • area: main
  • in suites: jessie-kfreebsd
  • size: 2,189,132 kB
  • sloc: cpp: 9,691,462; ansic: 3,341,451; python: 712,689; asm: 518,779; xml: 208,926; java: 169,820; sh: 119,353; perl: 68,907; makefile: 28,311; yacc: 13,305; objc: 11,385; tcl: 3,186; cs: 2,225; sql: 2,217; lex: 2,215; lisp: 1,349; pascal: 1,256; awk: 407; ruby: 155; sed: 53; php: 14; exp: 11
file content (44 lines) | stat: -rw-r--r-- 1,002 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
 
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GFX_GEOMETRY_CUBIC_BEZIER_H_
#define UI_GFX_GEOMETRY_CUBIC_BEZIER_H_

#include "base/macros.h"
#include "ui/gfx/gfx_export.h"

namespace gfx {

class GFX_EXPORT CubicBezier {
 public:
  CubicBezier(double x1, double y1, double x2, double y2);
  ~CubicBezier();

  // Returns an approximation of y at the given x.
  double Solve(double x) const;

  // Returns an approximation of dy/dx at the given x.
  double Slope(double x) const;

  // Sets |min| and |max| to the bezier's minimum and maximium y values in the
  // interval [0, 1].
  void Range(double* min, double* max) const;

 private:
  void InitGradients();

  double x1_;
  double y1_;
  double x2_;
  double y2_;

  double start_gradient_;
  double end_gradient_;

  DISALLOW_ASSIGN(CubicBezier);
};

}  // namespace gfx

#endif  // UI_GFX_GEOMETRY_CUBIC_BEZIER_H_