125 lines
4.9 KiB
C++
125 lines
4.9 KiB
C++
// Ryzom - MMORPG Framework <http://dev.ryzom.com/projects/ryzom/>
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// Copyright (C) 2010 Winch Gate Property Limited
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program 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 Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#ifndef RY_ANGLE_H
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#define RY_ANGLE_H
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#include "nel/misc/types_nl.h"
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#include "nel/misc/vector_2d.h"
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#include <string>
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class CAngle
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{
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public:
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// enum for pseudo contante
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enum
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{
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// the pi value
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PI = 0x8000
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};
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CAngle(): _data(0) {}
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inline CAngle(const CAngle &other) : _data(other._data) {}
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inline CAngle(const sint16 &val) : _data(val) {}
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inline CAngle(const sint32 &val) : _data((sint16)val) {}
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inline CAngle(const uint16 &val) : _data((sint16)val) {}
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inline CAngle(const uint32 &val) : _data((sint16)val) {}
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inline CAngle(const double &val)
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{
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// This code correct a nasty bug :
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// GCC and MSVC don't handle the cast from a float
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// into a 16 bit signed interger when the
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// float value overflow inside the integer.
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// It seeems that GCC bound the value to 0x8000 (-32768) and 0x7fff (32767)
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// but MSVC just truncate the exedent bits (as if it perform a float
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// to 32 bit interger conversion first).
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// NB : Fundamentaly, the problem is that it is bad to cast something with an overflow... ;)
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sint32 a = sint32(val*(PI/NLMISC::Pi));
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while (a >= PI)
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a-=2*PI;
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while (a < -PI)
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a+=2*PI;
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_data = sint16(a);
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}
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#ifdef NL_COMP_VC6
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inline CAngle(const sint &val) : _data((sint16)val) {}
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inline CAngle(const uint &val) : _data((sint16)val) {}
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#endif
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template <class C> bool operator>(const C &other) const { return _data>CAngle(other)._data; }
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template <class C> bool operator<(const C &other) const { return _data<CAngle(other)._data; }
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template <class C> bool operator>=(const C &other) const { return _data>=CAngle(other)._data; }
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template <class C> bool operator<=(const C &other) const { return _data<=CAngle(other)._data; }
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template <class C> bool operator==(const C &other) const { return _data==CAngle(other)._data; }
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template <class C> bool operator!=(const C &other) const { return _data!=CAngle(other)._data; }
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template <class C> CAngle &operator=(const C &val) { _data=CAngle(val)._data; return *this; }
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template <class C> CAngle &operator+=(const C &val) { _data+=CAngle(val)._data; return *this; }
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template <class C> CAngle &operator-=(const C &val) { _data-=CAngle(val)._data; return *this; }
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template <class C> CAngle &operator*=(const C &val) { _data*=val; return *this; }
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template <class C> CAngle &operator/=(const C &val) { _data/=val; return *this; }
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template <class C> CAngle operator+(const C &val) { return CAngle(_data+CAngle(val)._data); }
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template <class C> CAngle operator-(const C &val) { return CAngle(_data-CAngle(val)._data); }
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template <class C> CAngle operator*(const C &val) { return CAngle(sint16(_data*val)); }
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CAngle operator/(const double &val) const { return CAngle((sint16)(_data/val)); }
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float operator/(const CAngle &val) const { return (float)_data/(float)val._data; }
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CAngle &operator-() { _data=-_data; return *this; }
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float asRadians() const { return (float)((float)_data*(NLMISC::Pi/PI)); }
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sint16 asRawSint16() const { return _data; }
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int asDegrees() const { return (360*(uint16)_data+PI)/(2*PI); }
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const char* asCompassHeading() { return "NOT IMPLEMENTED YET"; }
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NLMISC::CVector2d asVector2d() const { float radians=asRadians();return NLMISC::CVector2d(cos(radians), sin(radians)); }
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inline static const CAngle &pi() { static CAngle p(PI); return p; }
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private:
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sint16 _data;
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};
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//-----------------------------------------------
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// computeShortestAngle :
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// Compute the angle between a source and a destination using the shortest way.
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// \param from : angle between -Pi and Pi;
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// \param to : angle between -Pi and Pi;
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//-----------------------------------------------
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inline double computeShortestAngle(double from, double to)
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{
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double difAngle = to - from;
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if (difAngle<-NLMISC::Pi) // Angle in the wrong direction.
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return difAngle+2.0*NLMISC::Pi;
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else
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{
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if (difAngle>NLMISC::Pi) // Angle in the wrong direction.
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return difAngle-2.0*NLMISC::Pi;
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else
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return difAngle;
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}
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}// computeShortestAngle //
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#endif
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