CrystalSpace

Public API Reference

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 
00023 #include "csextern.h"
00024 
00032 class csString;
00033 
00037 class CS_CRYSTALSPACE_EXPORT csVector2
00038 {
00039 public:
00041   float x;
00043   float y;
00044 
00046   csVector2 () {}
00047 
00049   csVector2 (float v) 
00050     : x (v), y (v)
00051   {}
00052 
00054   csVector2 (float x, float y) 
00055     : x (x), y (y) 
00056   { }
00057 
00059   csVector2 (const csVector2& o) 
00060     : x (o.x), y (o.y)
00061   {}
00062 
00064   csString Description() const;
00065 
00067   inline void Set (float ix, float iy)
00068   { x = ix; y = iy; }
00069 
00071   inline void Set (csVector2 const& v)
00072   { x = v.x; y = v.y; }
00073 
00075   inline void Set (float const* v) { x = v[0]; y = v[1]; }
00076 
00078   inline void Set (float v) { x = y = v; }
00079 
00081   inline void Get (float* v) { v[0] = x; v[1] = y; }
00082 
00084   static float Norm (csVector2 const& v);
00085 
00087   float Norm () const;
00088 
00090   inline float SquaredNorm () const
00091   { return x * x + y * y; }
00092 
00094   void Rotate (float angle);
00095 
00100   inline float IsLeft (const csVector2& p0, const csVector2& p1)
00101   {
00102     return (p1.x - p0.x)*(y - p0.y) - (x - p0.x)*(p1.y - p0.y);
00103   }
00104 
00106   csVector2& operator+= (const csVector2& v)
00107   { x += v.x;  y += v.y;  return *this; }
00108 
00110   csVector2& operator-= (const csVector2& v)
00111   { x -= v.x;  y -= v.y;  return *this; }
00112 
00114   csVector2& operator*= (float f) { x *= f;  y *= f;  return *this; }
00115 
00117   csVector2& operator/= (float f)
00118   {
00119     f = 1.0f / f;
00120     x *= f;
00121     y *= f;
00122     return *this;
00123   }
00124 
00126   inline csVector2 operator+ () const { return *this; }
00127 
00129   inline csVector2 operator- () const { return csVector2(-x,-y); }
00130 
00132   friend CS_CRYSTALSPACE_EXPORT csVector2 operator+ (const csVector2& v1, 
00133     const csVector2& v2);
00135   friend CS_CRYSTALSPACE_EXPORT csVector2 operator- (const csVector2& v1, 
00136     const csVector2& v2);
00138   friend CS_CRYSTALSPACE_EXPORT float operator* (const csVector2& v1, 
00139     const csVector2& v2);
00141   friend CS_CRYSTALSPACE_EXPORT csVector2 operator* (const csVector2& v,
00142         float f);
00144   friend CS_CRYSTALSPACE_EXPORT csVector2 operator* (float f,
00145         const csVector2& v);
00147   friend CS_CRYSTALSPACE_EXPORT csVector2 operator/ (const csVector2& v,
00148         float f);
00150   friend CS_CRYSTALSPACE_EXPORT bool operator== (const csVector2& v1, 
00151     const csVector2& v2);
00153   friend CS_CRYSTALSPACE_EXPORT bool operator!= (const csVector2& v1, 
00154     const csVector2& v2);
00155 
00157   inline friend bool operator< (const csVector2& v, float f)
00158   { return ABS(v.x)<f && ABS(v.y)<f; }
00159 
00161   inline friend bool operator> (float f, const csVector2& v)
00162   { return ABS(v.x)<f && ABS(v.y)<f; }
00163 
00164 
00166   inline float operator[] (int n) const { return !n?x:y; }
00168   inline float & operator[] (int n) { return !n?x:y; }
00169 };
00170 
00173 #endif // __CS_VECTOR2_H__

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