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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 float 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_VECTOR2D_F_H_
#define UI_GFX_VECTOR2D_F_H_
#include <string>
#include "ui/base/ui_export.h"
namespace gfx {
class UI_EXPORT Vector2dF {
public:
Vector2dF() : x_(0), y_(0) {}
Vector2dF(float x, float y) : x_(x), y_(y) {}
float x() const { return x_; }
void set_x(float x) { x_ = x; }
float y() const { return y_; }
void set_y(float 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 Vector2dF& other);
// Subtract the components of the |other| vector from the current vector.
void Subtract(const Vector2dF& other);
void operator+=(const Vector2dF& other) { Add(other); }
void operator-=(const Vector2dF& other) { Subtract(other); }
void ClampToMax(const Vector2dF& max) {
x_ = x_ <= max.x_ ? x_ : max.x_;
y_ = y_ <= max.y_ ? y_ : max.y_;
}
void ClampToMin(const Vector2dF& min) {
x_ = x_ >= min.x_ ? x_ : min.x_;
y_ = y_ >= min.y_ ? y_ : min.y_;
}
// Gives the square of the diagonal length of the vector.
double LengthSquared() const;
// Gives the diagonal length of the vector.
float Length() const;
// Scale the x and y components of the vector by |scale|.
void Scale(float scale) { Scale(scale, scale); }
// Scale the x and y components of the vector by |x_scale| and |y_scale|
// respectively.
void Scale(float x_scale, float y_scale);
std::string ToString() const;
private:
float x_;
float y_;
};
inline bool operator==(const Vector2dF& lhs, const Vector2dF& rhs) {
return lhs.x() == rhs.x() && lhs.y() == rhs.y();
}
inline Vector2dF operator-(const Vector2dF& v) {
return Vector2dF(-v.x(), -v.y());
}
inline Vector2dF operator+(const Vector2dF& lhs, const Vector2dF& rhs) {
Vector2dF result = lhs;
result.Add(rhs);
return result;
}
inline Vector2dF operator-(const Vector2dF& lhs, const Vector2dF& rhs) {
Vector2dF result = lhs;
result.Add(-rhs);
return result;
}
// Return the cross product of two vectors.
UI_EXPORT double CrossProduct(const Vector2dF& lhs, const Vector2dF& rhs);
// Return the dot product of two vectors.
UI_EXPORT double DotProduct(const Vector2dF& lhs, const Vector2dF& rhs);
// Return a vector that is |v| scaled by the given scale factors along each
// axis.
UI_EXPORT Vector2dF ScaleVector2d(const Vector2dF& v,
float x_scale,
float y_scale);
// Return a vector that is |v| scaled by the given scale factor.
inline Vector2dF ScaleVector2d(const Vector2dF& v, float scale) {
return ScaleVector2d(v, scale, scale);
}
} // namespace gfx
#endif // UI_GFX_VECTOR2D_F_H_
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