text: // 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 UI_GFX_GEOMETRY_VECTOR2D_H_
  #define UI_GFX_GEOMETRY_VECTOR2D_H_
  
  #include <stdint.h>
  
  #include <iosfwd>
  #include <string>
  
  #include "ui/gfx/geometry/geometry_export.h"
  #include "ui/gfx/geometry/vector2d_f.h"
  
  namespace gfx {
  
  class GEOMETRY_EXPORT Vector2d {
   public:
    constexpr Vector2d() : x_(0), y_(0) {}
    constexpr Vector2d(int x, int y) : x_(x), y_(y) {}
  
    constexpr int x() const { return x_; }
    void set_x(int x) { x_ = x; }
  
    constexpr 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);
  
    constexpr bool operator==(const Vector2d& other) const {
      return x_ == other.x_ && y_ == other.y_;
    }
    void operator+=(const Vector2d& other) { Add(other); }
    void operator-=(const Vector2d& other) { Subtract(other); }
  
    void SetToMin(const Vector2d& other) {
      x_ = std::min(x_, other.x_);
      y_ = std::min(y_, other.y_);
    }
  
    void SetToMax(const Vector2d& other) {
      x_ = std::max(x_, other.x_);
      y_ = std::max(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_t 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 constexpr 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;
  }
  
  // This is declared here for use in gtest-based unit tests but is defined in
  // the //ui/gfx:test_support target. Depend on that to use this in your unit
  // test. This should not be used in production code - call ToString() instead.
  void PrintTo(const Vector2d& vector, ::std::ostream* os);
  
  }  // namespace gfx
  
  #endif // UI_GFX_GEOMETRY_VECTOR2D_H_
  