vector2d.h revision 5d1f7b1de12d16ceb2c938c56701a3e8bfa558f7 
1// Copyright (c) 2012 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// Defines a simple integer vector class.  This class is used to indicate a
6// distance in two dimensions between two points. Subtracting two points should
7// produce a vector, and adding a vector to a point produces the point at the
8// vector's distance from the original point.
9
10#ifndef UI_GFX_GEOMETRY_VECTOR2D_H_
11#define UI_GFX_GEOMETRY_VECTOR2D_H_
12
13#include <string>
14
15#include "base/basictypes.h"
16#include "ui/gfx/geometry/vector2d_f.h"
17#include "ui/gfx/gfx_export.h"
18
19namespace gfx {
20
21class GFX_EXPORT Vector2d {
22 public:
23  Vector2d() : x_(0), y_(0) {}
24  Vector2d(int x, int y) : x_(x), y_(y) {}
25
26  int x() const { return x_; }
27  void set_x(int x) { x_ = x; }
28
29  int y() const { return y_; }
30  void set_y(int y) { y_ = y; }
31
32  // True if both components of the vector are 0.
33  bool IsZero() const;
34
35  // Add the components of the |other| vector to the current vector.
36  void Add(const Vector2d& other);
37  // Subtract the components of the |other| vector from the current vector.
38  void Subtract(const Vector2d& other);
39
40  void operator+=(const Vector2d& other) { Add(other); }
41  void operator-=(const Vector2d& other) { Subtract(other); }
42
43  void SetToMin(const Vector2d& other) {
44    x_ = x_ <= other.x_ ? x_ : other.x_;
45    y_ = y_ <= other.y_ ? y_ : other.y_;
46  }
47
48  void SetToMax(const Vector2d& other) {
49    x_ = x_ >= other.x_ ? x_ : other.x_;
50    y_ = y_ >= other.y_ ? y_ : other.y_;
51  }
52
53  // Gives the square of the diagonal length of the vector. Since this is
54  // cheaper to compute than Length(), it is useful when you want to compare
55  // relative lengths of different vectors without needing the actual lengths.
56  int64 LengthSquared() const;
57  // Gives the diagonal length of the vector.
58  float Length() const;
59
60  std::string ToString() const;
61
62  operator Vector2dF() const { return Vector2dF(x_, y_); }
63
64 private:
65  int x_;
66  int y_;
67};
68
69inline bool operator==(const Vector2d& lhs, const Vector2d& rhs) {
70  return lhs.x() == rhs.x() && lhs.y() == rhs.y();
71}
72
73inline Vector2d operator-(const Vector2d& v) {
74  return Vector2d(-v.x(), -v.y());
75}
76
77inline Vector2d operator+(const Vector2d& lhs, const Vector2d& rhs) {
78  Vector2d result = lhs;
79  result.Add(rhs);
80  return result;
81}
82
83inline Vector2d operator-(const Vector2d& lhs, const Vector2d& rhs) {
84  Vector2d result = lhs;
85  result.Add(-rhs);
86  return result;
87}
88
89}  // namespace gfx
90
91#endif // UI_GFX_GEOMETRY_VECTOR2D_H_
92