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// 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/vector2d_f.h"
#include <cmath>
#include "base/strings/stringprintf.h"
#include "build/build_config.h"
namespace gfx {
std::string Vector2dF::ToString() const {
return base::StringPrintf("[%g %g]", 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 hypotf(x_, y_);
}
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;
}
float Vector2dF::SlopeAngleRadians() const {
#if BUILDFLAG(IS_MAC)
// atan2f(...) returns less accurate results on Mac.
// 3.1415925 vs. 3.14159274 for atan2f(0, -50) as an example.
return static_cast<float>(
atan2(static_cast<double>(y_), static_cast<double>(x_)));
#else
return atan2f(y_, x_);
#endif
}
} // namespace gfx
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