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 #include "ui/gfx/vector2d_f.h" 6 7 #include <cmath> 8 9 #include "base/strings/stringprintf.h" 10 11 namespace gfx { 12 13 std::string Vector2dF::ToString() const { 14 return base::StringPrintf("[%f %f]", x_, y_); 15 } 16 17 bool Vector2dF::IsZero() const { 18 return x_ == 0 && y_ == 0; 19 } 20 21 void Vector2dF::Add(const Vector2dF& other) { 22 x_ += other.x_; 23 y_ += other.y_; 24 } 25 26 void Vector2dF::Subtract(const Vector2dF& other) { 27 x_ -= other.x_; 28 y_ -= other.y_; 29 } 30 31 double Vector2dF::LengthSquared() const { 32 return static_cast<double>(x_) * x_ + static_cast<double>(y_) * y_; 33 } 34 35 float Vector2dF::Length() const { 36 return static_cast<float>(std::sqrt(LengthSquared())); 37 } 38 39 void Vector2dF::Scale(float x_scale, float y_scale) { 40 x_ *= x_scale; 41 y_ *= y_scale; 42 } 43 44 double CrossProduct(const Vector2dF& lhs, const Vector2dF& rhs) { 45 return static_cast<double>(lhs.x()) * rhs.y() - 46 static_cast<double>(lhs.y()) * rhs.x(); 47 } 48 49 double DotProduct(const Vector2dF& lhs, const Vector2dF& rhs) { 50 return static_cast<double>(lhs.x()) * rhs.x() + 51 static_cast<double>(lhs.y()) * rhs.y(); 52 } 53 54 Vector2dF ScaleVector2d(const Vector2dF& v, float x_scale, float y_scale) { 55 Vector2dF scaled_v(v); 56 scaled_v.Scale(x_scale, y_scale); 57 return scaled_v; 58 } 59 60 } // namespace gfx 61
