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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Defines a simple integer vector class. This class is used to indicate a
// distance in two dimensions between two points. Subtracting two points should
// produce a vector, and adding a vector to a point produces the point at the
// vector's distance from the original point.
#ifndef UI_GFX_GEOMETRY_VECTOR2D_H_
#define UI_GFX_GEOMETRY_VECTOR2D_H_
#include <stdint.h>
#include <iosfwd>
#include <string>
#include "base/component_export.h"
#include "ui/gfx/geometry/vector2d_f.h"
namespace gfx {
class COMPONENT_EXPORT(GEOMETRY) Vector2d {
public:
constexpr Vector2d() : x_(0), y_(0) {}
constexpr Vector2d(int x, int y) : x_(x), y_(y) {}
constexpr int x() const { return x_; }
void set_x(int x) { x_ = x; }
constexpr int y() const { return y_; }
void set_y(int y) { y_ = y; }
// True if both components of the vector are 0.
bool IsZero() const;
// Add the components of the |other| vector to the current vector.
void Add(const Vector2d& other);
// Subtract the components of the |other| vector from the current vector.
void Subtract(const Vector2d& other);
constexpr bool operator==(const Vector2d& other) const {
return x_ == other.x_ && y_ == other.y_;
}
void operator+=(const Vector2d& other) { Add(other); }
void operator-=(const Vector2d& other) { Subtract(other); }
void SetToMin(const Vector2d& other) {
x_ = std::min(x_, other.x_);
y_ = std::min(y_, other.y_);
}
void SetToMax(const Vector2d& other) {
x_ = std::max(x_, other.x_);
y_ = std::max(y_, other.y_);
}
// Gives the square of the diagonal length of the vector. Since this is
// cheaper to compute than Length(), it is useful when you want to compare
// relative lengths of different vectors without needing the actual lengths.
int64_t LengthSquared() const;
// Gives the diagonal length of the vector.
float Length() const;
void Transpose() {
using std::swap;
swap(x_, y_);
}
std::string ToString() const;
operator Vector2dF() const {
return Vector2dF(static_cast<float>(x()), static_cast<float>(y()));
}
private:
int x_;
int y_;
};
COMPONENT_EXPORT(GEOMETRY) Vector2d operator-(const Vector2d&);
inline Vector2d operator+(const Vector2d& lhs, const Vector2d& rhs) {
Vector2d result = lhs;
result.Add(rhs);
return result;
}
inline Vector2d operator-(const Vector2d& lhs, const Vector2d& rhs) {
Vector2d result = lhs;
result.Subtract(rhs);
return result;
}
inline Vector2d TransposeVector2d(const Vector2d& v) {
return Vector2d(v.y(), v.x());
}
// This is declared here for use in gtest-based unit tests but is defined in
// the //ui/gfx:test_support target. Depend on that to use this in your unit
// test. This should not be used in production code - call ToString() instead.
void PrintTo(const Vector2d& vector, ::std::ostream* os);
} // namespace gfx
#endif // UI_GFX_GEOMETRY_VECTOR2D_H_
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