diff options
Diffstat (limited to 'source/blender/freestyle/intern/stroke/CurveIterators.h')
| -rwxr-xr-x | source/blender/freestyle/intern/stroke/CurveIterators.h | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/source/blender/freestyle/intern/stroke/CurveIterators.h b/source/blender/freestyle/intern/stroke/CurveIterators.h new file mode 100755 index 00000000000..a45ef4bfdaf --- /dev/null +++ b/source/blender/freestyle/intern/stroke/CurveIterators.h @@ -0,0 +1,299 @@ +// +// Filename : CurveIterators.h +// Author(s) : Stephane Grabli +// Purpose : Iterators used to iterate over the elements of the Curve +// Date of creation : 01/08/2003 +// +/////////////////////////////////////////////////////////////////////////////// + + +// +// Copyright (C) : Please refer to the COPYRIGHT file distributed +// with this source distribution. +// +// This program is free software; you can redistribute it and/or +// modify it under the terms of the GNU General Public License +// as published by the Free Software Foundation; either version 2 +// of the License, or (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +// +/////////////////////////////////////////////////////////////////////////////// + +#ifndef CURVEITERATORS_H +# define CURVEITERATORS_H + +#include "Stroke.h" +#include "Curve.h" + +namespace CurveInternal { + + /*! iterator on a curve. Allows an iterating outside + * initial vertices. A CurvePoint is instanciated an returned + * when the iterator is dereferenced. + */ + + class CurvePointIterator : public Interface0DIteratorNested + { + public: + friend class ::Curve; + public: + float _CurvilinearLength; + float _step; + ::Curve::vertex_container::iterator __A; + ::Curve::vertex_container::iterator __B; + ::Curve::vertex_container::iterator _begin; + ::Curve::vertex_container::iterator _end; + int _n; + int _currentn; + float _t; + mutable CurvePoint _Point; + float _CurveLength; + + public: + + public: + inline CurvePointIterator(float step = 0.f) + : Interface0DIteratorNested() + { + _step = step; + _CurvilinearLength = 0.f; + _t = 0.f; + //_Point = 0; + _n = 0; + _currentn = 0; + _CurveLength=0; + } + + inline CurvePointIterator(const CurvePointIterator& iBrother) + : Interface0DIteratorNested() + { + __A = iBrother.__A; + __B = iBrother.__B; + _begin = iBrother._begin; + _end = iBrother._end; + _CurvilinearLength = iBrother._CurvilinearLength; + _step = iBrother._step; + _t = iBrother._t; + _Point = iBrother._Point; + _n = iBrother._n; + _currentn = iBrother._currentn; + _CurveLength = iBrother._CurveLength; + } + inline CurvePointIterator& operator=(const CurvePointIterator& iBrother) + { + __A = iBrother.__A; + __B = iBrother.__B; + _begin = iBrother._begin; + _end = iBrother._end; + _CurvilinearLength = iBrother._CurvilinearLength; + _step = iBrother._step; + _t = iBrother._t; + _Point = iBrother._Point; + _n = iBrother._n; + _currentn = iBrother._currentn; + _CurveLength = iBrother._CurveLength; + return *this; + } + virtual ~CurvePointIterator() + { + } + protected: + inline CurvePointIterator(::Curve::vertex_container::iterator iA, + ::Curve::vertex_container::iterator iB, + ::Curve::vertex_container::iterator ibegin, + ::Curve::vertex_container::iterator iend, + int currentn, + int n, + float iCurveLength, + float step, float t=0.f, float iCurvilinearLength = 0.f) + : Interface0DIteratorNested() + { + __A = iA; + __B = iB; + _begin = ibegin; + _end = iend; + _CurvilinearLength = iCurvilinearLength; + _step = step; + _t = t; + _n = n; + _currentn = currentn; + _CurveLength = iCurveLength; + } + + public: + + virtual CurvePointIterator* copy() const { + return new CurvePointIterator(*this); + } + + inline Interface0DIterator castToInterface0DIterator() const{ + Interface0DIterator ret(new CurveInternal::CurvePointIterator(*this)); + return ret; + } + virtual string getExactTypeName() const { + return "CurvePointIterator"; + } + + // operators + inline CurvePointIterator& operator++() // operator corresponding to ++i + { + increment(); + return *this; + } + + inline CurvePointIterator& operator--() // operator corresponding to ++i + { + decrement(); + return *this; + } + + // comparibility + virtual bool operator==(const Interface0DIteratorNested& b) const + { + const CurvePointIterator* it_exact = dynamic_cast<const CurvePointIterator*>(&b); + if (!it_exact) + return false; + return ((__A==it_exact->__A) && (__B==it_exact->__B) && (_t == it_exact->_t)); + } + + // dereferencing + virtual CurvePoint& operator*() + { + return (_Point = CurvePoint(*__A,*__B,_t)); + } + virtual CurvePoint* operator->() { return &(operator*());} + public: + virtual bool isBegin() const + { + if((__A == _begin) && (_t < (float)M_EPSILON)) + return true; + return false; + } + virtual bool isEnd() const + { + if(__B == _end) + return true; + return false; + } + +// protected: + + virtual int increment() + { + if((_currentn == _n-1) && (_t == 1.f)) + { + // we're setting the iterator to end + ++__A; + ++__B; + ++_currentn; + _t = 0.f; + return 0; + } + + if(0 == _step) // means we iterate over initial vertices + { + Vec3r vec_tmp((*__B)->point2d() - (*__A)->point2d()); + _CurvilinearLength += (float)vec_tmp.norm(); + if(_currentn == _n-1) + { + _t = 1.f; + return 0; + } + ++__B; + ++__A; + ++_currentn; + return 0; + } + + // compute the new position: + Vec3r vec_tmp2((*__A)->point2d() - (*__B)->point2d()); + float normAB = (float)vec_tmp2.norm(); + + if(normAB > M_EPSILON) + { + _CurvilinearLength += _step; + _t = _t + _step/normAB; + } + else + _t = 1.f; // AB is a null segment, we're directly at its end + //if normAB ~= 0, we don't change these values + if(_t >= 1) + { + _CurvilinearLength -= normAB*(_t-1); + if(_currentn == _n-1) + _t=1.f; + else + { + _t = 0.f; + ++_currentn; + ++__A;++__B; + } + } + return 0; + } + virtual int decrement() + { + if(_t == 0.f) //we're at the beginning of the edge + { + _t = 1.f; + --_currentn; + --__A; --__B; + if(_currentn == _n-1) + return 0; + } + + if(0 == _step) // means we iterate over initial vertices + { + Vec3r vec_tmp((*__B)->point2d() - (*__A)->point2d()); + _CurvilinearLength -= (float)vec_tmp.norm(); + _t = 0; + return 0; + } + + // compute the new position: + Vec3r vec_tmp2((*__A)->point2d() - (*__B)->point2d()); + float normAB = (float)vec_tmp2.norm(); + + if(normAB >M_EPSILON) + { + _CurvilinearLength -= _step; + _t = _t - _step/normAB; + } + else + _t = -1.f; // We just need a negative value here + + // round value + if(fabs(_t) < (float)M_EPSILON) + _t = 0.0; + if(_t < 0) + { + if(_currentn == 0) + _CurvilinearLength = 0.f; + else + _CurvilinearLength += normAB*(-_t); + _t = 0.f; + } + return 0; + } + + virtual float t() const{ + return _CurvilinearLength; + } + virtual float u() const{ + return _CurvilinearLength/_CurveLength; + } + }; + + + +} // end of namespace StrokeInternal + +#endif // CURVEITERATORS_H |