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 float 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_F_H_ 11 #define UI_GFX_GEOMETRY_VECTOR2D_F_H_ 12 13 #include <iosfwd> 14 #include <string> 15 16 #include "ui/gfx/gfx_export.h" 17 18 namespace gfx { 19 20 class GFX_EXPORT Vector2dF { 21 public: 22 constexpr Vector2dF() : x_(0), y_(0) {} 23 constexpr Vector2dF(float x, float y) : x_(x), y_(y) {} 24 25 constexpr float x() const { return x_; } 26 void set_x(float x) { x_ = x; } 27 28 constexpr float y() const { return y_; } 29 void set_y(float y) { y_ = y; } 30 31 // True if both components of the vector are 0. 32 bool IsZero() const; 33 34 // Add the components of the |other| vector to the current vector. 35 void Add(const Vector2dF& other); 36 // Subtract the components of the |other| vector from the current vector. 37 void Subtract(const Vector2dF& other); 38 39 void operator+=(const Vector2dF& other) { Add(other); } 40 void operator-=(const Vector2dF& other) { Subtract(other); } 41 42 void SetToMin(const Vector2dF& other) { 43 x_ = x_ <= other.x_ ? x_ : other.x_; 44 y_ = y_ <= other.y_ ? y_ : other.y_; 45 } 46 47 void SetToMax(const Vector2dF& other) { 48 x_ = x_ >= other.x_ ? x_ : other.x_; 49 y_ = y_ >= other.y_ ? y_ : other.y_; 50 } 51 52 // Gives the square of the diagonal length of the vector. 53 double LengthSquared() const; 54 // Gives the diagonal length of the vector. 55 float Length() const; 56 57 // Scale the x and y components of the vector by |scale|. 58 void Scale(float scale) { Scale(scale, scale); } 59 // Scale the x and y components of the vector by |x_scale| and |y_scale| 60 // respectively. 61 void Scale(float x_scale, float y_scale); 62 63 std::string ToString() const; 64 65 private: 66 float x_; 67 float y_; 68 }; 69 70 inline constexpr bool operator==(const Vector2dF& lhs, const Vector2dF& rhs) { 71 return lhs.x() == rhs.x() && lhs.y() == rhs.y(); 72 } 73 74 inline constexpr bool operator!=(const Vector2dF& lhs, const Vector2dF& rhs) { 75 return !(lhs == rhs); 76 } 77 78 inline constexpr Vector2dF operator-(const Vector2dF& v) { 79 return Vector2dF(-v.x(), -v.y()); 80 } 81 82 inline Vector2dF operator+(const Vector2dF& lhs, const Vector2dF& rhs) { 83 Vector2dF result = lhs; 84 result.Add(rhs); 85 return result; 86 } 87 88 inline Vector2dF operator-(const Vector2dF& lhs, const Vector2dF& rhs) { 89 Vector2dF result = lhs; 90 result.Add(-rhs); 91 return result; 92 } 93 94 // Return the cross product of two vectors. 95 GFX_EXPORT double CrossProduct(const Vector2dF& lhs, const Vector2dF& rhs); 96 97 // Return the dot product of two vectors. 98 GFX_EXPORT double DotProduct(const Vector2dF& lhs, const Vector2dF& rhs); 99 100 // Return a vector that is |v| scaled by the given scale factors along each 101 // axis. 102 GFX_EXPORT Vector2dF ScaleVector2d(const Vector2dF& v, 103 float x_scale, 104 float y_scale); 105 106 // Return a vector that is |v| scaled by the given scale factor. 107 inline Vector2dF ScaleVector2d(const Vector2dF& v, float scale) { 108 return ScaleVector2d(v, scale, scale); 109 } 110 111 // This is declared here for use in gtest-based unit tests but is defined in 112 // the //ui/gfx:test_support target. Depend on that to use this in your unit 113 // test. This should not be used in production code - call ToString() instead. 114 void PrintTo(const Vector2dF& vector, ::std::ostream* os); 115 116 } // namespace gfx 117 118 #endif // UI_GFX_GEOMETRY_VECTOR2D_F_H_ 119
