ui/gfx/vector2d.h

   1 // Copyright (c) 2012 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 // Defines a simple integer vector class.  This class is used to indicate a
   6 // distance in two dimensions between two points. Subtracting two points should
   7 // produce a vector, and adding a vector to a point produces the point at the
   8 // vector's distance from the original point.
   9
  10 #ifndef UI_GFX_VECTOR2D_H_
  11 #define UI_GFX_VECTOR2D_H_
  12
  13 #include <string>
  14
  15 #include "base/basictypes.h"
  16 #include "ui/gfx/gfx_export.h"
  17 #include "ui/gfx/vector2d_f.h"
  18
  19 namespace gfx {
  20
  21 class GFX_EXPORT Vector2d {
  22  public:
  23   Vector2d() : x_(0), y_(0) {}
  24   Vector2d(int x, int y) : x_(x), y_(y) {}
  25
  26   int x() const { return x_; }
  27   void set_x(int x) { x_ = x; }
  28
  29   int y() const { return y_; }
  30   void set_y(int y) { y_ = y; }
  31
  32   // True if both components of the vector are 0.
  33   bool IsZero() const;
  34
  35   // Add the components of the |other| vector to the current vector.
  36   void Add(const Vector2d& other);
  37   // Subtract the components of the |other| vector from the current vector.
  38   void Subtract(const Vector2d& other);
  39
  40   void operator+=(const Vector2d& other) { Add(other); }
  41   void operator-=(const Vector2d& other) { Subtract(other); }
  42
  43   void SetToMin(const Vector2d& other) {
  44     x_ = x_ <= other.x_ ? x_ : other.x_;
  45     y_ = y_ <= other.y_ ? y_ : other.y_;
  46   }
  47
  48   void SetToMax(const Vector2d& other) {
  49     x_ = x_ >= other.x_ ? x_ : other.x_;
  50     y_ = y_ >= other.y_ ? y_ : other.y_;
  51   }
  52
  53   // Gives the square of the diagonal length of the vector. Since this is
  54   // cheaper to compute than Length(), it is useful when you want to compare
  55   // relative lengths of different vectors without needing the actual lengths.
  56   int64 LengthSquared() const;
  57   // Gives the diagonal length of the vector.
  58   float Length() const;
  59
  60   std::string ToString() const;
  61
  62   operator Vector2dF() const { return Vector2dF(x_, y_); }
  63
  64  private:
  65   int x_;
  66   int y_;
  67 };
  68
  69 inline bool operator==(const Vector2d& lhs, const Vector2d& rhs) {
  70   return lhs.x() == rhs.x() && lhs.y() == rhs.y();
  71 }
  72
  73 inline Vector2d operator-(const Vector2d& v) {
  74   return Vector2d(-v.x(), -v.y());
  75 }
  76
  77 inline Vector2d operator+(const Vector2d& lhs, const Vector2d& rhs) {
  78   Vector2d result = lhs;
  79   result.Add(rhs);
  80   return result;
  81 }
  82
  83 inline Vector2d operator-(const Vector2d& lhs, const Vector2d& rhs) {
  84   Vector2d result = lhs;
  85   result.Add(-rhs);
  86   return result;
  87 }
  88
  89 }  // namespace gfx
  90
  91 #endif // UI_GFX_VECTOR2D_H_