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_VECTOR2D_F_H_ 11 #define UI_GFX_VECTOR2D_F_H_ 12 13 #include <string> 14 15 #include "ui/base/ui_export.h" 16 17 namespace gfx { 18 19 class UI_EXPORT Vector2dF { 20 public: 21 Vector2dF() : x_(0), y_(0) {} 22 Vector2dF(float x, float y) : x_(x), y_(y) {} 23 24 float x() const { return x_; } 25 void set_x(float x) { x_ = x; } 26 27 float y() const { return y_; } 28 void set_y(float y) { y_ = y; } 29 30 // True if both components of the vector are 0. 31 bool IsZero() const; 32 33 // Add the components of the |other| vector to the current vector. 34 void Add(const Vector2dF& other); 35 // Subtract the components of the |other| vector from the current vector. 36 void Subtract(const Vector2dF& other); 37 38 void operator+=(const Vector2dF& other) { Add(other); } 39 void operator-=(const Vector2dF& other) { Subtract(other); } 40 41 void SetToMin(const Vector2dF& other) { 42 x_ = x_ <= other.x_ ? x_ : other.x_; 43 y_ = y_ <= other.y_ ? y_ : other.y_; 44 } 45 46 void SetToMax(const Vector2dF& other) { 47 x_ = x_ >= other.x_ ? x_ : other.x_; 48 y_ = y_ >= other.y_ ? y_ : other.y_; 49 } 50 51 // Gives the square of the diagonal length of the vector. 52 double LengthSquared() const; 53 // Gives the diagonal length of the vector. 54 float Length() const; 55 56 // Scale the x and y components of the vector by |scale|. 57 void Scale(float scale) { Scale(scale, scale); } 58 // Scale the x and y components of the vector by |x_scale| and |y_scale| 59 // respectively. 60 void Scale(float x_scale, float y_scale); 61 62 std::string ToString() const; 63 64 private: 65 float x_; 66 float y_; 67 }; 68 69 inline bool operator==(const Vector2dF& lhs, const Vector2dF& rhs) { 70 return lhs.x() == rhs.x() && lhs.y() == rhs.y(); 71 } 72 73 inline bool operator!=(const Vector2dF& lhs, const Vector2dF& rhs) { 74 return !(lhs == rhs); 75 } 76 77 inline Vector2dF operator-(const Vector2dF& v) { 78 return Vector2dF(-v.x(), -v.y()); 79 } 80 81 inline Vector2dF operator+(const Vector2dF& lhs, const Vector2dF& rhs) { 82 Vector2dF result = lhs; 83 result.Add(rhs); 84 return result; 85 } 86 87 inline Vector2dF operator-(const Vector2dF& lhs, const Vector2dF& rhs) { 88 Vector2dF result = lhs; 89 result.Add(-rhs); 90 return result; 91 } 92 93 // Return the cross product of two vectors. 94 UI_EXPORT double CrossProduct(const Vector2dF& lhs, const Vector2dF& rhs); 95 96 // Return the dot product of two vectors. 97 UI_EXPORT double DotProduct(const Vector2dF& lhs, const Vector2dF& rhs); 98 99 // Return a vector that is |v| scaled by the given scale factors along each 100 // axis. 101 UI_EXPORT Vector2dF ScaleVector2d(const Vector2dF& v, 102 float x_scale, 103 float y_scale); 104 105 // Return a vector that is |v| scaled by the given scale factor. 106 inline Vector2dF ScaleVector2d(const Vector2dF& v, float scale) { 107 return ScaleVector2d(v, scale, scale); 108 } 109 110 } // namespace gfx 111 112 #endif // UI_GFX_VECTOR2D_F_H_ 113
