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