wtf/Vector3.h

   1 /*
   2  * Copyright (C) 2010 Google Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  14  *     its contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #ifndef Vector3_h
  30 #define Vector3_h
  31
  32 #include <math.h>
  33
  34 namespace WebCore {
  35
  36 class Vector3 {
  37 public:
  38     Vector3()
  39         : m_x(0.0)
  40         , m_y(0.0)
  41         , m_z(0.0)
  42     {
  43     }
  44
  45     Vector3(double x, double y, double z)
  46         : m_x(x)
  47         , m_y(y)
  48         , m_z(z)
  49     {
  50     }
  51
  52     Vector3(const float p[3])
  53         : m_x(p[0])
  54         , m_y(p[1])
  55         , m_z(p[2])
  56     {
  57     }
  58
  59     Vector3(const double p[3])
  60         : m_x(p[0])
  61         , m_y(p[1])
  62         , m_z(p[2])
  63     {
  64     }
  65
  66     double abs() const
  67     {
  68         return sqrt(m_x * m_x + m_y * m_y + m_z * m_z);
  69     }
  70
  71     bool isZero() const
  72     {
  73         return !m_x && !m_y && !m_z;
  74     }
  75
  76     void normalize()
  77     {
  78         double absValue = abs();
  79         if (!absValue)
  80             return;
  81
  82         double k = 1.0 / absValue;
  83         m_x *= k;
  84         m_y *= k;
  85         m_z *= k;
  86     }
  87
  88     double x() const { return m_x; }
  89     double y() const { return m_y; }
  90     double z() const { return m_z; }
  91
  92 private:
  93     double m_x;
  94     double m_y;
  95     double m_z;
  96 };
  97
  98 inline Vector3 operator+(const Vector3& v1, const Vector3& v2)
  99 {
 100     return Vector3(v1.x() + v2.x(), v1.y() + v2.y(), v1.z() + v2.z());
 101 }
 102
 103 inline Vector3 operator-(const Vector3& v1, const Vector3& v2)
 104 {
 105     return Vector3(v1.x() - v2.x(), v1.y() - v2.y(), v1.z() - v2.z());
 106 }
 107
 108 inline Vector3 operator*(double k, const Vector3& v)
 109 {
 110     return Vector3(k * v.x(), k * v.y(), k * v.z());
 111 }
 112
 113 inline Vector3 operator*(const Vector3& v, double k)
 114 {
 115     return Vector3(k * v.x(), k * v.y(), k * v.z());
 116 }
 117
 118 inline double dot(const Vector3& v1, const Vector3& v2)
 119 {
 120     return v1.x() * v2.x() + v1.y() * v2.y() + v1.z() * v2.z();
 121 }
 122
 123 inline Vector3 cross(const Vector3& v1, const Vector3& v2)
 124 {
 125     double x3 = v1.y() * v2.z() - v1.z() * v2.y();
 126     double y3 = v1.z() * v2.x() - v1.x() * v2.z();
 127     double z3 = v1.x() * v2.y() - v1.y() * v2.x();
 128     return Vector3(x3, y3, z3);
 129 }
 130
 131 inline double distance(const Vector3& v1, const Vector3& v2)
 132 {
 133     return (v1 - v2).abs();
 134 }
 135
 136 } // WebCore
 137
 138 #endif // Vector3_h