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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 
00029 #include "csextern.h"
00030 #include "csutil/csstring.h"
00031 
00035 class CS_CSGEOM_EXPORT csVector2
00036 {
00037 public:
00039   float x;
00041   float y;
00042 
00044   csVector2 () {}
00045 
00047   csVector2 (float x, float y) { csVector2::x = x; csVector2::y = y; }
00048 
00050   csString Description() const;
00051 
00053   inline void Set (float ix, float iy)
00054   { x = ix; y = iy; }
00055 
00057   inline void Set (csVector2 const& v)
00058   { x = v.x; y = v.y; }
00059 
00061   inline void Set (float const* v) { x = v[0]; y = v[1]; }
00062 
00064   inline void Set (float v) { x = y = v; }
00065 
00067   inline void Get (float* v) { v[0] = x; v[1] = y; }
00068 
00070   static float Norm (csVector2 const& v);
00071 
00073   float Norm () const;
00074 
00076   float SquaredNorm () const
00077   { return x * x + y * y; }
00078 
00080   void Rotate (float angle);
00081 
00086   float IsLeft (const csVector2& p0, const csVector2& p1)
00087   {
00088     return (p1.x - p0.x)*(y - p0.y) - (x - p0.x)*(p1.y - p0.y);
00089   }
00090 
00092   csVector2& operator+= (const csVector2& v)
00093   { x += v.x;  y += v.y;  return *this; }
00094 
00096   csVector2& operator-= (const csVector2& v)
00097   { x -= v.x;  y -= v.y;  return *this; }
00098 
00100   csVector2& operator*= (float f) { x *= f;  y *= f;  return *this; }
00101 
00103   csVector2& operator/= (float f)
00104   {
00105     f = 1.0f / f;
00106     x *= f;
00107     y *= f;
00108     return *this;
00109   }
00110 
00112   inline csVector2 operator+ () const { return *this; }
00113 
00115   inline csVector2 operator- () const { return csVector2(-x,-y); }
00116 
00118   friend CS_CSGEOM_EXPORT csVector2 operator+ (const csVector2& v1, 
00119     const csVector2& v2);
00121   friend CS_CSGEOM_EXPORT csVector2 operator- (const csVector2& v1, 
00122     const csVector2& v2);
00124   friend CS_CSGEOM_EXPORT float operator* (const csVector2& v1, 
00125     const csVector2& v2);
00127   friend CS_CSGEOM_EXPORT csVector2 operator* (const csVector2& v, float f);
00129   friend CS_CSGEOM_EXPORT csVector2 operator* (float f, const csVector2& v);
00131   friend CS_CSGEOM_EXPORT csVector2 operator/ (const csVector2& v, float f);
00133   friend CS_CSGEOM_EXPORT bool operator== (const csVector2& v1, 
00134     const csVector2& v2);
00136   friend CS_CSGEOM_EXPORT bool operator!= (const csVector2& v1, 
00137     const csVector2& v2);
00138 
00140   inline friend bool operator< (const csVector2& v, float f)
00141   { return ABS(v.x)<f && ABS(v.y)<f; }
00142 
00144   inline friend bool operator> (float f, const csVector2& v)
00145   { return ABS(v.x)<f && ABS(v.y)<f; }
00146 };
00147 
00150 #endif // __CS_VECTOR2_H__

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