| // 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 UI_GFX_GEOMETRY_VECTOR2D_F_H_ |
| #define UI_GFX_GEOMETRY_VECTOR2D_F_H_ |
| |
| #include <iosfwd> |
| #include <string> |
| |
| #include "ui/gfx/gfx_export.h" |
| |
| namespace gfx { |
| |
| class GFX_EXPORT Vector2dF { |
| public: |
| Vector2dF() : x_(0), y_(0) {} |
| Vector2dF(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); } |
| |
| 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. |
| GFX_EXPORT double CrossProduct(const Vector2dF& lhs, const Vector2dF& rhs); |
| |
| // Return the dot product of two vectors. |
| GFX_EXPORT double DotProduct(const Vector2dF& lhs, const Vector2dF& rhs); |
| |
| // Return a vector that is |v| scaled by the given scale factors along each |
| // axis. |
| GFX_EXPORT 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); |
| } |
| |
| // This is declared here for use in gtest-based unit tests but is defined in |
| // the 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 Vector2dF& vector, ::std::ostream* os); |
| |
| } // namespace gfx |
| |
| #endif // UI_GFX_GEOMETRY_VECTOR2D_F_H_ |