1 files changed, 108 insertions, 0 deletions
diff --git a/ui/gfx/geometry/vector3d_f.cc b/ui/gfx/geometry/vector3d_f.cc
new file mode 100644
index 0000000000..749e330f27
--- /dev/null
+++ b/ui/gfx/geometry/vector3d_f.cc
@@ -0,0 +1,108 @@
+// 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.
+
+#include "ui/gfx/geometry/vector3d_f.h"
+
+#include <cmath>
+
+#include "base/strings/stringprintf.h"
+#include "ui/gfx/geometry/angle_conversions.h"
+
+namespace {
+const double kEpsilon = 1.0e-6;
+}
+
+namespace gfx {
+
+std::string Vector3dF::ToString() const {
+  return base::StringPrintf("[%f %f %f]", x_, y_, z_);
+}
+
+bool Vector3dF::IsZero() const {
+  return x_ == 0 && y_ == 0 && z_ == 0;
+}
+
+void Vector3dF::Add(const Vector3dF& other) {
+  x_ += other.x_;
+  y_ += other.y_;
+  z_ += other.z_;
+}
+
+void Vector3dF::Subtract(const Vector3dF& other) {
+  x_ -= other.x_;
+  y_ -= other.y_;
+  z_ -= other.z_;
+}
+
+double Vector3dF::LengthSquared() const {
+  return static_cast<double>(x_) * x_ + static_cast<double>(y_) * y_ +
+      static_cast<double>(z_) * z_;
+}
+
+float Vector3dF::Length() const {
+  return static_cast<float>(std::sqrt(LengthSquared()));
+}
+
+void Vector3dF::Scale(float x_scale, float y_scale, float z_scale) {
+  x_ *= x_scale;
+  y_ *= y_scale;
+  z_ *= z_scale;
+}
+
+void Vector3dF::Cross(const Vector3dF& other) {
+  double dx = x_;
+  double dy = y_;
+  double dz = z_;
+  float x = static_cast<float>(dy * other.z() - dz * other.y());
+  float y = static_cast<float>(dz * other.x() - dx * other.z());
+  float z = static_cast<float>(dx * other.y() - dy * other.x());
+  x_ = x;
+  y_ = y;
+  z_ = z;
+}
+
+bool Vector3dF::GetNormalized(Vector3dF* out) const {
+  double length_squared = LengthSquared();
+  *out = *this;
+  if (length_squared < kEpsilon * kEpsilon)
+    return false;
+  out->Scale(1 / sqrt(length_squared));
+  return true;
+}
+
+float DotProduct(const Vector3dF& lhs, const Vector3dF& rhs) {
+  return lhs.x() * rhs.x() + lhs.y() * rhs.y() + lhs.z() * rhs.z();
+}
+
+Vector3dF ScaleVector3d(const Vector3dF& v,
+                        float x_scale,
+                        float y_scale,
+                        float z_scale) {
+  Vector3dF scaled_v(v);
+  scaled_v.Scale(x_scale, y_scale, z_scale);
+  return scaled_v;
+}
+
+float AngleBetweenVectorsInDegrees(const gfx::Vector3dF& base,
+                                   const gfx::Vector3dF& other) {
+  return gfx::RadToDeg(
+      std::acos(gfx::DotProduct(base, other) / base.Length() / other.Length()));
+}
+
+float ClockwiseAngleBetweenVectorsInDegrees(const gfx::Vector3dF& base,
+                                            const gfx::Vector3dF& other,
+                                            const gfx::Vector3dF& normal) {
+  float angle = AngleBetweenVectorsInDegrees(base, other);
+  gfx::Vector3dF cross(base);
+  cross.Cross(other);
+
+  // If the dot product of this cross product is normal, it means that the
+  // shortest angle between |base| and |other| was counterclockwise with respect
+  // to the surface represented by |normal| and this angle must be reversed.
+  if (gfx::DotProduct(cross, normal) > 0.0f)
+    angle = 360.0f - angle;
+  return angle;
+}
+
+}  // namespace gfx