| // 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 "cobalt/math/vector2d_f.h" |
| |
| #include <cmath> |
| |
| #include "base/strings/stringprintf.h" |
| |
| namespace cobalt { |
| namespace math { |
| |
| std::string Vector2dF::ToString() const { |
| return base::StringPrintf("[%f %f]", x_, y_); |
| } |
| |
| bool Vector2dF::IsZero() const { return x_ == 0 && y_ == 0; } |
| |
| void Vector2dF::Add(const Vector2dF& other) { |
| x_ += other.x_; |
| y_ += other.y_; |
| } |
| |
| void Vector2dF::Subtract(const Vector2dF& other) { |
| x_ -= other.x_; |
| y_ -= other.y_; |
| } |
| |
| double Vector2dF::LengthSquared() const { |
| return static_cast<double>(x_) * x_ + static_cast<double>(y_) * y_; |
| } |
| |
| float Vector2dF::Length() const { |
| return static_cast<float>(std::sqrt(LengthSquared())); |
| } |
| |
| void Vector2dF::Scale(float x_scale, float y_scale) { |
| x_ *= x_scale; |
| y_ *= y_scale; |
| } |
| |
| double CrossProduct(const Vector2dF& lhs, const Vector2dF& rhs) { |
| return static_cast<double>(lhs.x()) * rhs.y() - |
| static_cast<double>(lhs.y()) * rhs.x(); |
| } |
| |
| double DotProduct(const Vector2dF& lhs, const Vector2dF& rhs) { |
| return static_cast<double>(lhs.x()) * rhs.x() + |
| static_cast<double>(lhs.y()) * rhs.y(); |
| } |
| |
| Vector2dF ScaleVector2d(const Vector2dF& v, float x_scale, float y_scale) { |
| Vector2dF scaled_v(v); |
| scaled_v.Scale(x_scale, y_scale); |
| return scaled_v; |
| } |
| |
| } // namespace math |
| } // namespace cobalt |