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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef UI_GFX_POINT_H_
      6 #define UI_GFX_POINT_H_
      7 #pragma once
      8 
      9 #include <string>
     10 
     11 #include "build/build_config.h"
     12 #include "ui/base/ui_export.h"
     13 
     14 #if defined(OS_WIN)
     15 typedef unsigned long DWORD;
     16 typedef struct tagPOINT POINT;
     17 #elif defined(OS_MACOSX)
     18 #include <ApplicationServices/ApplicationServices.h>
     19 #endif
     20 
     21 namespace gfx {
     22 
     23 // A point has an x and y coordinate.
     24 class UI_EXPORT Point {
     25  public:
     26   Point();
     27   Point(int x, int y);
     28 #if defined(OS_WIN)
     29   // |point| is a DWORD value that contains a coordinate.  The x-coordinate is
     30   // the low-order short and the y-coordinate is the high-order short.  This
     31   // value is commonly acquired from GetMessagePos/GetCursorPos.
     32   explicit Point(DWORD point);
     33   explicit Point(const POINT& point);
     34   Point& operator=(const POINT& point);
     35 #elif defined(OS_MACOSX)
     36   explicit Point(const CGPoint& point);
     37 #endif
     38 
     39   ~Point() {}
     40 
     41   int x() const { return x_; }
     42   int y() const { return y_; }
     43 
     44   void SetPoint(int x, int y) {
     45     x_ = x;
     46     y_ = y;
     47   }
     48 
     49   void set_x(int x) { x_ = x; }
     50   void set_y(int y) { y_ = y; }
     51 
     52   void Offset(int delta_x, int delta_y) {
     53     x_ += delta_x;
     54     y_ += delta_y;
     55   }
     56 
     57   Point Add(const Point& other) const{
     58     Point copy = *this;
     59     copy.Offset(other.x_, other.y_);
     60     return copy;
     61   }
     62 
     63   Point Subtract(const Point& other) const {
     64     Point copy = *this;
     65     copy.Offset(-other.x_, -other.y_);
     66     return copy;
     67   }
     68 
     69   Point Middle(const Point& other) const {
     70     return Point((x_ + other.x_) / 2, (y_ + other.y_) / 2);
     71   }
     72 
     73   bool operator==(const Point& rhs) const {
     74     return x_ == rhs.x_ && y_ == rhs.y_;
     75   }
     76 
     77   bool operator!=(const Point& rhs) const {
     78     return !(*this == rhs);
     79   }
     80 
     81   // A point is less than another point if its y-value is closer
     82   // to the origin. If the y-values are the same, then point with
     83   // the x-value closer to the origin is considered less than the
     84   // other.
     85   // This comparison is required to use Points in sets, or sorted
     86   // vectors.
     87   bool operator<(const Point& rhs) const {
     88     return (y_ == rhs.y_) ? (x_ < rhs.x_) : (y_ < rhs.y_);
     89   }
     90 
     91 #if defined(OS_WIN)
     92   POINT ToPOINT() const;
     93 #elif defined(OS_MACOSX)
     94   CGPoint ToCGPoint() const;
     95 #endif
     96 
     97   // Returns a string representation of point.
     98   std::string ToString() const;
     99 
    100  private:
    101   int x_;
    102   int y_;
    103 };
    104 
    105 }  // namespace gfx
    106 
    107 #endif  // UI_GFX_POINT_H_
    108