ui/gfx/vector3d_f.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 float 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_VECTOR3D_F_H_
  11 #define UI_GFX_VECTOR3D_F_H_
  12
  13 #include <string>
  14
  15 #include "ui/base/ui_export.h"
  16 #include "ui/gfx/vector2d_f.h"
  17
  18 namespace gfx {
  19
  20 class UI_EXPORT Vector3dF {
  21  public:
  22   Vector3dF();
  23   Vector3dF(float x, float y, float z);
  24
  25   explicit Vector3dF(const Vector2dF& other);
  26
  27   float x() const { return x_; }
  28   void set_x(float x) { x_ = x; }
  29
  30   float y() const { return y_; }
  31   void set_y(float y) { y_ = y; }
  32
  33   float z() const { return z_; }
  34   void set_z(float z) { z_ = z; }
  35
  36   // True if all components of the vector are 0.
  37   bool IsZero() const;
  38
  39   // Add the components of the |other| vector to the current vector.
  40   void Add(const Vector3dF& other);
  41   // Subtract the components of the |other| vector from the current vector.
  42   void Subtract(const Vector3dF& other);
  43
  44   void operator+=(const Vector3dF& other) { Add(other); }
  45   void operator-=(const Vector3dF& other) { Subtract(other); }
  46
  47   void SetToMin(const Vector3dF& other) {
  48     x_ = x_ <= other.x_ ? x_ : other.x_;
  49     y_ = y_ <= other.y_ ? y_ : other.y_;
  50     z_ = z_ <= other.z_ ? z_ : other.z_;
  51   }
  52
  53   void SetToMax(const Vector3dF& other) {
  54     x_ = x_ >= other.x_ ? x_ : other.x_;
  55     y_ = y_ >= other.y_ ? y_ : other.y_;
  56     z_ = z_ >= other.z_ ? z_ : other.z_;
  57   }
  58
  59   // Gives the square of the diagonal length of the vector.
  60   double LengthSquared() const;
  61   // Gives the diagonal length of the vector.
  62   float Length() const;
  63
  64   // Scale all components of the vector by |scale|.
  65   void Scale(float scale) { Scale(scale, scale, scale); }
  66   // Scale the each component of the vector by the given scale factors.
  67   void Scale(float x_scale, float y_scale, float z_scale);
  68
  69   // Take the cross product of this vector with |other| and become the result.
  70   void Cross(const Vector3dF& other);
  71
  72   std::string ToString() const;
  73
  74  private:
  75   float x_;
  76   float y_;
  77   float z_;
  78 };
  79
  80 inline bool operator==(const Vector3dF& lhs, const Vector3dF& rhs) {
  81   return lhs.x() == rhs.x() && lhs.y() == rhs.y() && lhs.z() == rhs.z();
  82 }
  83
  84 inline Vector3dF operator-(const Vector3dF& v) {
  85   return Vector3dF(-v.x(), -v.y(), -v.z());
  86 }
  87
  88 inline Vector3dF operator+(const Vector3dF& lhs, const Vector3dF& rhs) {
  89   Vector3dF result = lhs;
  90   result.Add(rhs);
  91   return result;
  92 }
  93
  94 inline Vector3dF operator-(const Vector3dF& lhs, const Vector3dF& rhs) {
  95   Vector3dF result = lhs;
  96   result.Add(-rhs);
  97   return result;
  98 }
  99
 100 // Return the cross product of two vectors.
 101 inline Vector3dF CrossProduct(const Vector3dF& lhs, const Vector3dF& rhs) {
 102   Vector3dF result = lhs;
 103   result.Cross(rhs);
 104   return result;
 105 }
 106
 107 // Return the dot product of two vectors.
 108 UI_EXPORT float DotProduct(const Vector3dF& lhs, const Vector3dF& rhs);
 109
 110 // Return a vector that is |v| scaled by the given scale factors along each
 111 // axis.
 112 UI_EXPORT Vector3dF ScaleVector3d(const Vector3dF& v,
 113                                   float x_scale,
 114                                   float y_scale,
 115                                   float z_scale);
 116
 117 // Return a vector that is |v| scaled by the given scale factor.
 118 inline Vector3dF ScaleVector3d(const Vector3dF& v, float scale) {
 119   return ScaleVector3d(v, scale, scale, scale);
 120 }
 121
 122 }  // namespace gfx
 123
 124 #endif // UI_GFX_VECTOR3D_F_H_