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 // 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 float 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_F_H_ #define COBALT_MATH_VECTOR2D_F_H_ #include #include #include "base/logging.h" namespace cobalt { namespace math { class Vector2dF { public: Vector2dF() : x_(0), y_(0) {} Vector2dF(float x, float y) : x_(x), y_(y) {} void SetVector(float x, float y) { x_ = x; y_ = y; } float x() const { return x_; } void set_x(float x) { x_ = x; } float y() const { return y_; } void set_y(float 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 Vector2dF& other); // Subtract the components of the |other| vector from the current vector. void Subtract(const Vector2dF& other); void operator+=(const Vector2dF& other) { Add(other); } void operator-=(const Vector2dF& other) { Subtract(other); } float operator[](int i) const { DCHECK_LE(0, i); DCHECK_GE(1, i); return i == 0 ? x_ : y_; } float& operator[](int i) { DCHECK_LE(0, i); DCHECK_GE(1, i); return i == 0 ? x_ : y_; } void SetToMin(const Vector2dF& other) { x_ = x_ <= other.x_ ? x_ : other.x_; y_ = y_ <= other.y_ ? y_ : other.y_; } void SetToMax(const Vector2dF& 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. double LengthSquared() const; // Gives the diagonal length of the vector. float Length() const; // Scale the x and y components of the vector by |scale|. void Scale(float scale) { Scale(scale, scale); } // Scale the x and y components of the vector by |x_scale| and |y_scale| // respectively. void Scale(float x_scale, float y_scale); std::string ToString() const; private: float x_; float y_; }; inline bool operator==(const Vector2dF& lhs, const Vector2dF& rhs) { return lhs.x() == rhs.x() && lhs.y() == rhs.y(); } inline bool operator!=(const Vector2dF& lhs, const Vector2dF& rhs) { return !(lhs == rhs); } inline Vector2dF operator-(const Vector2dF& v) { return Vector2dF(-v.x(), -v.y()); } inline Vector2dF operator+(const Vector2dF& lhs, const Vector2dF& rhs) { Vector2dF result = lhs; result.Add(rhs); return result; } inline Vector2dF operator-(const Vector2dF& lhs, const Vector2dF& rhs) { Vector2dF result = lhs; result.Add(-rhs); return result; } // Return the cross product of two vectors. double CrossProduct(const Vector2dF& lhs, const Vector2dF& rhs); // Return the dot product of two vectors. double DotProduct(const Vector2dF& lhs, const Vector2dF& rhs); // Return a vector that is |v| scaled by the given scale factors along each // axis. Vector2dF ScaleVector2d(const Vector2dF& v, float x_scale, float y_scale); // Return a vector that is |v| scaled by the given scale factor. inline Vector2dF ScaleVector2d(const Vector2dF& v, float scale) { return ScaleVector2d(v, scale, scale); } } // namespace math } // namespace cobalt #endif // COBALT_MATH_VECTOR2D_F_H_