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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 
00023 #include "csextern.h"
00024 
00031 class csString;
00032 
00036 class CS_CRYSTALSPACE_EXPORT csVector2
00037 {
00038 public:
00040   float x;
00042   float y;
00043 
00045   csVector2 () {}
00046 
00048   csVector2 (float v) 
00049     : x (v), y (v)
00050   {}
00051 
00053   csVector2 (float x, float y) 
00054     : x (x), y (y) 
00055   { }
00056 
00058   csVector2 (const csVector2& o) 
00059     : x (o.x), y (o.y)
00060   {}
00061 
00063   csString Description() const;
00064 
00066   inline void Set (float ix, float iy)
00067   { x = ix; y = iy; }
00068 
00070   inline void Set (csVector2 const& v)
00071   { x = v.x; y = v.y; }
00072 
00074   inline void Set (float const* v) { x = v[0]; y = v[1]; }
00075 
00077   inline void Set (float v) { x = y = v; }
00078 
00080   inline void Get (float* v) { v[0] = x; v[1] = y; }
00081 
00083   static float Norm (csVector2 const& v);
00084 
00086   float Norm () const;
00087 
00089   inline float SquaredNorm () const
00090   { return x * x + y * y; }
00091 
00093   void Rotate (float angle);
00094 
00099   inline float IsLeft (const csVector2& p0, const csVector2& p1)
00100   {
00101     return (p1.x - p0.x)*(y - p0.y) - (x - p0.x)*(p1.y - p0.y);
00102   }
00103 
00105   csVector2& operator+= (const csVector2& v)
00106   { x += v.x;  y += v.y;  return *this; }
00107 
00109   csVector2& operator-= (const csVector2& v)
00110   { x -= v.x;  y -= v.y;  return *this; }
00111 
00113   csVector2& operator*= (float f) { x *= f;  y *= f;  return *this; }
00114 
00116   csVector2& operator/= (float f)
00117   {
00118     f = 1.0f / f;
00119     x *= f;
00120     y *= f;
00121     return *this;
00122   }
00123 
00125   inline csVector2 operator+ () const { return *this; }
00126 
00128   inline csVector2 operator- () const { return csVector2(-x,-y); }
00129 
00131   friend CS_CRYSTALSPACE_EXPORT csVector2 operator+ (const csVector2& v1, 
00132     const csVector2& v2);
00134   friend CS_CRYSTALSPACE_EXPORT csVector2 operator- (const csVector2& v1, 
00135     const csVector2& v2);
00137   friend CS_CRYSTALSPACE_EXPORT float operator* (const csVector2& v1, 
00138     const csVector2& v2);
00140   friend CS_CRYSTALSPACE_EXPORT csVector2 operator* (const csVector2& v, float f);
00142   friend CS_CRYSTALSPACE_EXPORT csVector2 operator* (float f, const csVector2& v);
00144   friend CS_CRYSTALSPACE_EXPORT csVector2 operator/ (const csVector2& v, float f);
00146   friend CS_CRYSTALSPACE_EXPORT bool operator== (const csVector2& v1, 
00147     const csVector2& v2);
00149   friend CS_CRYSTALSPACE_EXPORT bool operator!= (const csVector2& v1, 
00150     const csVector2& v2);
00151 
00153   inline friend bool operator< (const csVector2& v, float f)
00154   { return ABS(v.x)<f && ABS(v.y)<f; }
00155 
00157   inline friend bool operator> (float f, const csVector2& v)
00158   { return ABS(v.x)<f && ABS(v.y)<f; }
00159 
00160 
00162   inline float operator[] (int n) const { return !n?x:y; }
00164   inline float & operator[] (int n) { return !n?x:y; }
00165 };
00166 
00169 #endif // __CS_VECTOR2_H__

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