132 lines
3.2 KiB
C++
132 lines
3.2 KiB
C++
/* Copyright (C) 2009 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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// Vector2D.h
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//
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// 2-dimensional vector class, primarily for use by simulation code.
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#ifndef INCLUDED_VECTOR2D
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#define INCLUDED_VECTOR2D
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#include <math.h>
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#include "maths/Vector3D.h"
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class CVector2D
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{
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public:
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float x;
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float y;
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inline CVector2D() { x = 0.0f; y = 0.0f; }
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inline CVector2D( float _x, float _y )
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{
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x = _x; y = _y;
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}
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inline CVector2D( const CVector3D& v3 ) // This is done an awful lot.
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{
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x = v3.X; y = v3.Z;
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}
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inline operator CVector3D() const
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{
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return( CVector3D( x, 0, y ) );
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}
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inline bool operator==( const CVector2D& rhs ) const
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{
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return( x == rhs.x && y == rhs.y );
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}
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static inline float Dot( const CVector2D& u, const CVector2D& v )
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{
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return( u.x * v.x + u.y * v.y );
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}
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static inline float betadot( const CVector2D& u, const CVector2D& v )
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{
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// Beta-dot product. I have no idea if that's its correct name
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// but use of it tends to simplify collision formulae.
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// At the moment I think all of my code uses separate vectors
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// and dots them together, though.
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return( u.x * v.y - u.y * v.x );
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}
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inline CVector2D beta() const
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{
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return( CVector2D( y, -x ) );
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}
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inline float Dot( const CVector2D& u ) const
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{
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return( Dot( *this, u ) );
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}
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inline float betadot( const CVector2D& u ) const
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{
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return( betadot( *this, u ) );
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}
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inline CVector2D operator+( const CVector2D& u ) const
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{
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return( CVector2D( x + u.x, y + u.y ) );
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}
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inline CVector2D operator-( const CVector2D& u ) const
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{
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return( CVector2D( x - u.x, y - u.y ) );
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}
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inline CVector2D& operator+=( const CVector2D& u )
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{
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x += u.x; y += u.y;
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return( *this );
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}
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inline CVector2D& operator-=( const CVector2D& u )
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{
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x -= u.x; y -= u.y;
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return( *this );
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}
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inline CVector2D operator*( const float scale ) const
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{
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return( CVector2D( x * scale, y * scale ) );
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}
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inline CVector2D operator/( const float scale ) const
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{
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return( CVector2D( x / scale, y / scale ) );
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}
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inline CVector2D& operator*=( const float scale )
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{
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x *= scale; y *= scale;
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return( *this );
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}
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inline CVector2D& operator/=( const float scale )
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{
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x /= scale; y /= scale;
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return( *this );
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}
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inline float Length() const
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{
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return( sqrt( x * x + y * y ) );
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}
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inline float length2() const
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{
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return( x * x + y * y );
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}
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CVector2D Normalize() const
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{
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float l = Length();
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if( l < 0.00001 ) return( CVector2D( 1.0f, 0.0f ) );
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l = 1 / l;
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return( CVector2D( x * l, y * l ) );
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}
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inline bool within( const float dist ) const
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{
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return( ( x * x + y * y ) <= ( dist * dist ) );
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}
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};
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#endif
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