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