ui/gfx/vector2d_f.cc

   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