Beginning Android C++ Game Development

Appendix     D

C++ Math

Video games cannot be created without at least a basic understanding of math, especially geometry.

This appendix covers the basic math classes provided with the samples on this book’s web site at http://www.apress.com/9781430258308.

Vectors

A vector is used for two purposes: to represent displacement and direction.

Vectors in games can come in three different varieties: two-dimensional (2D), 3D, and 4D homogenous vectors. This book only makes use of 3D and 4D vectors.

Listing D-1 shows the class declaration for the 3D Vector3 class.

Listing D-1.  The Vector3 Class Declaration

class Vector3{public:       float m_x;       float m_y;       float m_z;        Vector3();       Vector3(const float x, const float y, const float ...