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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_GEOMETRY_VECTOR2D_F_H_
- #define UI_GFX_GEOMETRY_VECTOR2D_F_H_
- #include <iosfwd>
- #include <string>
- #include "ui/gfx/geometry/geometry_export.h"
- namespace gfx {
- class GEOMETRY_EXPORT Vector2dF {
- public:
- constexpr Vector2dF() : x_(0), y_(0) {}
- constexpr Vector2dF(float x, float y) : x_(x), y_(y) {}
- constexpr float x() const { return x_; }
- void set_x(float x) { x_ = x; }
- constexpr 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 SetToMin(const Vector2dF& other) {
- x_ = std::min(x_, other.x_);
- y_ = std::min(y_, other.y_);
- }
- void SetToMax(const Vector2dF& other) {
- x_ = std::max(x_, other.x_);
- y_ = std::max(y_, other.y_);
- }
- // Gives the square of the diagonal length, i.e. the square of magnitude, of
- // the vector.
- double LengthSquared() const;
- // Gives the diagonal length (i.e. the magnitude) of the vector.
- float Length() const;
- float AspectRatio() const { return x_ / y_; }
- // Gives the slope angle in radians of the vector from the positive x axis,
- // in the range of (-pi, pi]. The sign of the result is the same as the sign
- // of y(), except that the result is pi for Vector2dF(negative-x, zero-y).
- float SlopeAngleRadians() 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);
- void Transpose() {
- using std::swap;
- swap(x_, y_);
- }
- std::string ToString() const;
- private:
- float x_;
- float y_;
- };
- inline constexpr bool operator==(const Vector2dF& lhs, const Vector2dF& rhs) {
- return lhs.x() == rhs.x() && lhs.y() == rhs.y();
- }
- inline constexpr bool operator!=(const Vector2dF& lhs, const Vector2dF& rhs) {
- return !(lhs == rhs);
- }
- inline constexpr 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, i.e. the determinant.
- GEOMETRY_EXPORT double CrossProduct(const Vector2dF& lhs, const Vector2dF& rhs);
- // Return the dot product of two vectors.
- GEOMETRY_EXPORT double DotProduct(const Vector2dF& lhs, const Vector2dF& rhs);
- // Return a vector that is |v| scaled by the given scale factors along each
- // axis.
- GEOMETRY_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);
- }
- inline Vector2dF TransposeVector2d(const Vector2dF& v) {
- return Vector2dF(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 Vector2dF& vector, ::std::ostream* os);
- } // namespace gfx
- #endif // UI_GFX_GEOMETRY_VECTOR2D_F_H_
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