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.
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.
10 #ifndef UI_GFX_VECTOR2D_F_H_
11 #define UI_GFX_VECTOR2D_F_H_
15 #include "ui/base/ui_export.h"
19 class UI_EXPORT Vector2dF
{
21 Vector2dF() : x_(0), y_(0) {}
22 Vector2dF(float x
, float y
) : x_(x
), y_(y
) {}
24 float x() const { return x_
; }
25 void set_x(float x
) { x_
= x
; }
27 float y() const { return y_
; }
28 void set_y(float y
) { y_
= y
; }
30 // True if both components of the vector are 0.
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
);
38 void operator+=(const Vector2dF
& other
) { Add(other
); }
39 void operator-=(const Vector2dF
& other
) { Subtract(other
); }
41 void SetToMin(const Vector2dF
& other
) {
42 x_
= x_
<= other
.x_
? x_
: other
.x_
;
43 y_
= y_
<= other
.y_
? y_
: other
.y_
;
46 void SetToMax(const Vector2dF
& other
) {
47 x_
= x_
>= other
.x_
? x_
: other
.x_
;
48 y_
= y_
>= other
.y_
? y_
: other
.y_
;
51 // Gives the square of the diagonal length of the vector.
52 double LengthSquared() const;
53 // Gives the diagonal length of the vector.
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|
60 void Scale(float x_scale
, float y_scale
);
62 std::string
ToString() const;
69 inline bool operator==(const Vector2dF
& lhs
, const Vector2dF
& rhs
) {
70 return lhs
.x() == rhs
.x() && lhs
.y() == rhs
.y();
73 inline Vector2dF
operator-(const Vector2dF
& v
) {
74 return Vector2dF(-v
.x(), -v
.y());
77 inline Vector2dF
operator+(const Vector2dF
& lhs
, const Vector2dF
& rhs
) {
78 Vector2dF result
= lhs
;
83 inline Vector2dF
operator-(const Vector2dF
& lhs
, const Vector2dF
& rhs
) {
84 Vector2dF result
= lhs
;
89 // Return the cross product of two vectors.
90 UI_EXPORT
double CrossProduct(const Vector2dF
& lhs
, const Vector2dF
& rhs
);
92 // Return the dot product of two vectors.
93 UI_EXPORT
double DotProduct(const Vector2dF
& lhs
, const Vector2dF
& rhs
);
95 // Return a vector that is |v| scaled by the given scale factors along each
97 UI_EXPORT Vector2dF
ScaleVector2d(const Vector2dF
& v
,
101 // Return a vector that is |v| scaled by the given scale factor.
102 inline Vector2dF
ScaleVector2d(const Vector2dF
& v
, float scale
) {
103 return ScaleVector2d(v
, scale
, scale
);
108 #endif // UI_GFX_VECTOR2D_F_H_