| // Copyright (c) 2012 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. |
| |
| // Defines a simple integer vector class. This class is used to indicate a |
| // distance in two dimensions between two points. Subtracting two points should |
| // produce a vector, and adding a vector to a point produces the point at the |
| // vector's distance from the original point. |
| |
| #ifndef COBALT_MATH_VECTOR2D_H_ |
| #define COBALT_MATH_VECTOR2D_H_ |
| |
| #include <iosfwd> |
| #include <string> |
| |
| #include "base/basictypes.h" |
| #include "cobalt/math/vector2d_f.h" |
| |
| namespace cobalt { |
| namespace math { |
| |
| class Vector2d { |
| public: |
| Vector2d() : x_(0), y_(0) {} |
| Vector2d(int x, int y) : x_(x), y_(y) {} |
| |
| void SetVector(int x, int y) { |
| x_ = x; |
| y_ = y; |
| } |
| |
| int x() const { return x_; } |
| void set_x(int x) { x_ = x; } |
| |
| int y() const { return y_; } |
| void set_y(int y) { y_ = y; } |
| |
| // True if both components of the vector are 0. |
| bool IsZero() const; |
| |
| // Add the components of the |other| vector to the current vector. |
| void Add(const Vector2d& other); |
| // Subtract the components of the |other| vector from the current vector. |
| void Subtract(const Vector2d& other); |
| |
| void operator+=(const Vector2d& other) { Add(other); } |
| void operator-=(const Vector2d& other) { Subtract(other); } |
| |
| void SetToMin(const Vector2d& other) { |
| x_ = x_ <= other.x_ ? x_ : other.x_; |
| y_ = y_ <= other.y_ ? y_ : other.y_; |
| } |
| |
| void SetToMax(const Vector2d& other) { |
| x_ = x_ >= other.x_ ? x_ : other.x_; |
| y_ = y_ >= other.y_ ? y_ : other.y_; |
| } |
| |
| // Gives the square of the diagonal length of the vector. Since this is |
| // cheaper to compute than Length(), it is useful when you want to compare |
| // relative lengths of different vectors without needing the actual lengths. |
| int64 LengthSquared() const; |
| // Gives the diagonal length of the vector. |
| float Length() const; |
| |
| std::string ToString() const; |
| |
| operator Vector2dF() const { |
| return Vector2dF(static_cast<float>(x_), static_cast<float>(y_)); |
| } |
| |
| private: |
| int x_; |
| int y_; |
| }; |
| |
| inline bool operator==(const Vector2d& lhs, const Vector2d& rhs) { |
| return lhs.x() == rhs.x() && lhs.y() == rhs.y(); |
| } |
| |
| inline Vector2d operator-(const Vector2d& v) { |
| return Vector2d(-v.x(), -v.y()); |
| } |
| |
| inline Vector2d operator+(const Vector2d& lhs, const Vector2d& rhs) { |
| Vector2d result = lhs; |
| result.Add(rhs); |
| return result; |
| } |
| |
| inline Vector2d operator-(const Vector2d& lhs, const Vector2d& rhs) { |
| Vector2d result = lhs; |
| result.Add(-rhs); |
| return result; |
| } |
| |
| } // namespace math |
| } // namespace cobalt |
| |
| #endif // COBALT_MATH_VECTOR2D_H_ |