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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.
// 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 <iosfwd>
#include <string>
#include "base/basictypes.h"
#include "ui/gfx/geometry/vector2d_f.h"
#include "ui/gfx/gfx_export.h"
namespace gfx {
class GFX_EXPORT Vector2d {
public:
Vector2d() : x_(0), y_(0) {}
Vector2d(int x, int y) : x_(x), y_(y) {}
int x() const { return x_; }
void set_x(int x) { x_ = x; }
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);
void operator+=(const Vector2d& other) { Add(other); }
void operator-=(const Vector2d& other) { Subtract(other); }
void SetToMin(const Vector2d& other) {
x_ = x_ <= other.x_ ? x_ : other.x_;
y_ = y_ <= other.y_ ? y_ : other.y_;
}
void SetToMax(const Vector2d& other) {
x_ = x_ >= other.x_ ? x_ : other.x_;
y_ = y_ >= other.y_ ? 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 LengthSquared() const;
// Gives the diagonal length of the vector.
float Length() const;
std::string ToString() const;
operator Vector2dF() const {
return Vector2dF(static_cast<float>(x()), static_cast<float>(y()));
}
private:
int x_;
int y_;
};
inline bool operator==(const Vector2d& lhs, const Vector2d& rhs) {
return lhs.x() == rhs.x() && lhs.y() == rhs.y();
}
inline Vector2d operator-(const Vector2d& v) {
return Vector2d(-v.x(), -v.y());
}
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.Add(-rhs);
return result;
}
// This is declared here for use in gtest-based unit tests but is defined in
// the 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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