74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
|
// Vector2D.h
|
||
|
//
|
||
|
// Last modified: 26 May 04, Mark Thompson mot20@cam.ac.uk / mark@wildfiregames.com
|
||
|
//
|
||
|
// 2-dimensional vector class, primarily for use by simulation code.
|
||
|
|
||
|
#ifndef VECTOR_2D_INCLUDED
|
||
|
#define VECTOR_2D_INCLUDED
|
||
|
|
||
|
#include "math.h"
|
||
|
|
||
|
class CVector2D
|
||
|
{
|
||
|
public:
|
||
|
float x;
|
||
|
float y;
|
||
|
CVector2D() {}
|
||
|
CVector2D( float _x, float _y )
|
||
|
{
|
||
|
x = _x; y = _y;
|
||
|
}
|
||
|
static inline float dot( const CVector2D& u, const CVector2D& v )
|
||
|
{
|
||
|
return( u.x * v.x + u.y * v.y );
|
||
|
}
|
||
|
inline float dot( const CVector2D& u ) const
|
||
|
{
|
||
|
return( dot( *this, u ) );
|
||
|
}
|
||
|
inline CVector2D operator+( const CVector2D& u ) const
|
||
|
{
|
||
|
return( CVector2D( x + u.x, y + u.y ) );
|
||
|
}
|
||
|
inline CVector2D operator-( const CVector2D& u ) const
|
||
|
{
|
||
|
return( CVector2D( x - u.x, y - u.y ) );
|
||
|
}
|
||
|
inline CVector2D& operator+=( const CVector2D& u )
|
||
|
{
|
||
|
x += u.x; y += u.y;
|
||
|
return( *this );
|
||
|
}
|
||
|
inline CVector2D& operator-=( const CVector2D& u )
|
||
|
{
|
||
|
x -= u.x; y -= u.y;
|
||
|
return( *this );
|
||
|
}
|
||
|
inline CVector2D operator*( const float scale ) const
|
||
|
{
|
||
|
return( CVector2D( x * scale, y * scale ) );
|
||
|
}
|
||
|
inline CVector2D& operator*=( const float scale )
|
||
|
{
|
||
|
x *= scale; y *= scale;
|
||
|
return( *this );
|
||
|
}
|
||
|
inline float length() const
|
||
|
{
|
||
|
return( sqrt( x * x + y * y ) );
|
||
|
}
|
||
|
CVector2D normalize() const
|
||
|
{
|
||
|
float l = length();
|
||
|
if( l < 0.00001 ) return( CVector2D( 1.0f, 0.0f ) );
|
||
|
l = 1 / l;
|
||
|
return( CVector2D( x * l, y * l ) );
|
||
|
}
|
||
|
inline bool within( const float dist ) const
|
||
|
{
|
||
|
return( ( x * x + y * y ) <= ( dist * dist ) );
|
||
|
}
|
||
|
};
|
||
|
|
||
|
#endif
|