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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.
- #ifndef UI_GFX_GEOMETRY_POINT_H_
- #define UI_GFX_GEOMETRY_POINT_H_
- #include <iosfwd>
- #include <string>
- #include <tuple>
- #include "base/numerics/clamped_math.h"
- #include "build/build_config.h"
- #include "ui/gfx/geometry/geometry_export.h"
- #include "ui/gfx/geometry/vector2d.h"
- #if BUILDFLAG(IS_WIN)
- typedef unsigned long DWORD;
- typedef struct tagPOINT POINT;
- #elif BUILDFLAG(IS_APPLE)
- typedef struct CGPoint CGPoint;
- #endif
- namespace gfx {
- // A point has an x and y coordinate.
- class GEOMETRY_EXPORT Point {
- public:
- constexpr Point() : x_(0), y_(0) {}
- constexpr Point(int x, int y) : x_(x), y_(y) {}
- #if BUILDFLAG(IS_WIN)
- // |point| is a DWORD value that contains a coordinate. The x-coordinate is
- // the low-order short and the y-coordinate is the high-order short. This
- // value is commonly acquired from GetMessagePos/GetCursorPos.
- explicit Point(DWORD point);
- explicit Point(const POINT& point);
- Point& operator=(const POINT& point);
- #elif BUILDFLAG(IS_APPLE)
- explicit Point(const CGPoint& point);
- #endif
- #if BUILDFLAG(IS_WIN)
- POINT ToPOINT() const;
- #elif BUILDFLAG(IS_APPLE)
- CGPoint ToCGPoint() const;
- #endif
- constexpr int x() const { return x_; }
- constexpr int y() const { return y_; }
- void set_x(int x) { x_ = x; }
- void set_y(int y) { y_ = y; }
- void SetPoint(int x, int y) {
- x_ = x;
- y_ = y;
- }
- void Offset(int delta_x, int delta_y) {
- x_ = base::ClampAdd(x_, delta_x);
- y_ = base::ClampAdd(y_, delta_y);
- }
- void operator+=(const Vector2d& vector) {
- x_ = base::ClampAdd(x_, vector.x());
- y_ = base::ClampAdd(y_, vector.y());
- }
- void operator-=(const Vector2d& vector) {
- x_ = base::ClampSub(x_, vector.x());
- y_ = base::ClampSub(y_, vector.y());
- }
- void SetToMin(const Point& other);
- void SetToMax(const Point& other);
- bool IsOrigin() const { return x_ == 0 && y_ == 0; }
- Vector2d OffsetFromOrigin() const { return Vector2d(x_, y_); }
- void Transpose() {
- using std::swap;
- swap(x_, y_);
- }
- // A point is less than another point if its y-value is closer
- // to the origin. If the y-values are the same, then point with
- // the x-value closer to the origin is considered less than the
- // other.
- // This comparison is required to use Point in sets, or sorted
- // vectors.
- bool operator<(const Point& rhs) const {
- return std::tie(y_, x_) < std::tie(rhs.y_, rhs.x_);
- }
- // Returns a string representation of point.
- std::string ToString() const;
- private:
- int x_;
- int y_;
- };
- constexpr bool operator==(const Point& lhs, const Point& rhs) {
- return lhs.x() == rhs.x() && lhs.y() == rhs.y();
- }
- inline bool operator!=(const Point& lhs, const Point& rhs) {
- return !(lhs == rhs);
- }
- inline Point operator+(const Point& lhs, const Vector2d& rhs) {
- Point result(lhs);
- result += rhs;
- return result;
- }
- inline Point operator-(const Point& lhs, const Vector2d& rhs) {
- Point result(lhs);
- result -= rhs;
- return result;
- }
- inline Vector2d operator-(const Point& lhs, const Point& rhs) {
- return Vector2d(base::ClampSub(lhs.x(), rhs.x()),
- base::ClampSub(lhs.y(), rhs.y()));
- }
- inline Point PointAtOffsetFromOrigin(const Vector2d& offset_from_origin) {
- return Point(offset_from_origin.x(), offset_from_origin.y());
- }
- inline Point TransposePoint(const gfx::Point& p) {
- return Point(p.y(), p.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 Point& point, ::std::ostream* os);
- // Helper methods to scale a gfx::Point to a new gfx::Point.
- GEOMETRY_EXPORT Point ScaleToCeiledPoint(const Point& point,
- float x_scale,
- float y_scale);
- GEOMETRY_EXPORT Point ScaleToCeiledPoint(const Point& point, float x_scale);
- GEOMETRY_EXPORT Point ScaleToFlooredPoint(const Point& point,
- float x_scale,
- float y_scale);
- GEOMETRY_EXPORT Point ScaleToFlooredPoint(const Point& point, float x_scale);
- GEOMETRY_EXPORT Point ScaleToRoundedPoint(const Point& point,
- float x_scale,
- float y_scale);
- GEOMETRY_EXPORT Point ScaleToRoundedPoint(const Point& point, float x_scale);
- } // namespace gfx
- #endif // UI_GFX_GEOMETRY_POINT_H_
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