```/* <![CDATA[ */
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ui/gfx/geometry/vector3d_f.h"
6
7#include <cmath>
8
9#include "base/strings/stringprintf.h"
10
11namespace gfx {
12
13Vector3dF::Vector3dF()
14    : x_(0),
15      y_(0),
16      z_(0) {
17}
18
19Vector3dF::Vector3dF(float x, float y, float z)
20    : x_(x),
21      y_(y),
22      z_(z) {
23}
24
25Vector3dF::Vector3dF(const Vector2dF& other)
26    : x_(other.x()),
27      y_(other.y()),
28      z_(0) {
29}
30
31std::string Vector3dF::ToString() const {
32  return base::StringPrintf("[%f %f %f]", x_, y_, z_);
33}
34
35bool Vector3dF::IsZero() const {
36  return x_ == 0 && y_ == 0 && z_ == 0;
37}
38
40  x_ += other.x_;
41  y_ += other.y_;
42  z_ += other.z_;
43}
44
45void Vector3dF::Subtract(const Vector3dF& other) {
46  x_ -= other.x_;
47  y_ -= other.y_;
48  z_ -= other.z_;
49}
50
51double Vector3dF::LengthSquared() const {
52  return static_cast<double>(x_) * x_ + static_cast<double>(y_) * y_ +
53      static_cast<double>(z_) * z_;
54}
55
56float Vector3dF::Length() const {
57  return static_cast<float>(std::sqrt(LengthSquared()));
58}
59
60void Vector3dF::Scale(float x_scale, float y_scale, float z_scale) {
61  x_ *= x_scale;
62  y_ *= y_scale;
63  z_ *= z_scale;
64}
65
66void Vector3dF::Cross(const Vector3dF& other) {
67  float x = y_ * other.z() - z_ * other.y();
68  float y = z_ * other.x() - x_ * other.z();
69  float z = x_ * other.y() - y_ * other.x();
70  x_ = x;
71  y_ = y;
72  z_ = z;
73}
74
75float DotProduct(const Vector3dF& lhs, const Vector3dF& rhs) {
76  return lhs.x() * rhs.x() + lhs.y() * rhs.y() + lhs.z() * rhs.z();
77}
78
79Vector3dF ScaleVector3d(const Vector3dF& v,
80                        float x_scale,
81                        float y_scale,
82                        float z_scale) {
83  Vector3dF scaled_v(v);
84  scaled_v.Scale(x_scale, y_scale, z_scale);
85  return scaled_v;
86}
87
88}  // namespace gfx
89```