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