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csgeom/vector2.h

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00001 /*
00002     Copyright (C) 2000 by Jorrit Tyberghein
00003     Largely rewritten by Ivan Avramovic <ivan@avramovic.com>
00004 
00005     This library is free software; you can redistribute it and/or
00006     modify it under the terms of the GNU Library General Public
00007     License as published by the Free Software Foundation; either
00008     version 2 of the License, or (at your option) any later version.
00009 
00010     This library is distributed in the hope that it will be useful,
00011     but WITHOUT ANY WARRANTY; without even the implied warranty of
00012     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013     Library General Public License for more details.
00014 
00015     You should have received a copy of the GNU Library General Public
00016     License along with this library; if not, write to the Free
00017     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00018 */
00019 
00020 #ifndef __CS_VECTOR2_H__
00021 #define __CS_VECTOR2_H__
00022 
00032 class csVector2
00033 {
00034 public:
00036   float x;
00038   float y;
00039 
00041   csVector2 () {}
00042 
00044   csVector2 (float x, float y) { csVector2::x = x; csVector2::y = y; }
00045 
00047   inline void Set (float ix, float iy)
00048   { x = ix; y = iy; }
00049 
00051   inline void Set (const csVector2& v)
00052   { x = v.x; y = v.y; }
00053 
00055   static float Norm (const csVector2& v);
00056 
00058   float Norm () const;
00059 
00061   float SquaredNorm () const
00062   { return x * x + y * y; }
00063 
00065   void Rotate (float angle);
00066 
00068   csVector2& operator+= (const csVector2& v)
00069   { x += v.x;  y += v.y;  return *this; }
00070 
00072   csVector2& operator-= (const csVector2& v)
00073   { x -= v.x;  y -= v.y;  return *this; }
00074 
00076   csVector2& operator*= (float f) { x *= f;  y *= f;  return *this; }
00077 
00079   csVector2& operator/= (float f) { f = 1.0f / f; x *= f;  y *= f;  return *this; }
00080 
00082   inline csVector2 operator+ () const { return *this; }
00083 
00085   inline csVector2 operator- () const { return csVector2(-x,-y); }
00086 
00088   friend csVector2 operator+ (const csVector2& v1, const csVector2& v2);
00090   friend csVector2 operator- (const csVector2& v1, const csVector2& v2);
00092   friend float operator* (const csVector2& v1, const csVector2& v2);
00094   friend csVector2 operator* (const csVector2& v, float f);
00096   friend csVector2 operator* (float f, const csVector2& v);
00098   friend csVector2 operator/ (const csVector2& v, float f);
00100   friend bool operator== (const csVector2& v1, const csVector2& v2);
00102   friend bool operator!= (const csVector2& v1, const csVector2& v2);
00103 
00105   inline friend bool operator< (const csVector2& v, float f)
00106   { return ABS(v.x)<f && ABS(v.y)<f; }
00107 
00109   inline friend bool operator> (float f, const csVector2& v)
00110   { return ABS(v.x)<f && ABS(v.y)<f; }
00111 };
00112 
00115 #endif // __CS_VECTOR2_H__

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