63 lines
3.4 KiB
C
63 lines
3.4 KiB
C
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/***************************************************************************
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* eval.h is part of Math Graphic Library
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* Copyright (C) 2007-2016 Alexey Balakin <mathgl.abalakin@gmail.ru> *
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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 Library 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 General Public License for more details. *
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* *
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* You should have received a copy of the GNU Library General Public *
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* License along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#ifndef _MGL_EVAL_H_
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#define _MGL_EVAL_H_
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//-----------------------------------------------------------------------------
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#include "mgl2/define.h"
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/// types of errors
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#define MGL_ERR_LOG 1
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#define MGL_ERR_ARC 2
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#define MGL_ERR_SQRT 3
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/// size of var array
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const int MGL_VS = 'z'-'a'+1;
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//-----------------------------------------------------------------------------
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/// Class for evaluating formula specified by the string
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class MGL_EXPORT mglFormula // îáúåêò äëÿ ââîäà è âû÷èñëåíèÿ ôîðìóë
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{
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public:
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/// Evaluates the formula for 'x','r'=\a x, 'y','n'=\a y, 'z','t'=\a z, 'u'=\a u
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mreal Calc(mreal x,mreal y=0,mreal z=0,mreal u=0) const MGL_FUNC_PURE;
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/// Evaluates the formula for 'x, y, z, u, v, w'
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mreal Calc(mreal x,mreal y,mreal z,mreal u,mreal v,mreal w) const MGL_FUNC_PURE;
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/// Evaluates the formula for variables var
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mreal Calc(const mreal var[MGL_VS]) const MGL_FUNC_PURE;
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/// Evaluates the formula for 'x','r'=\a x, 'y','n'=\a y, 'z','t'=\a z, 'u'=\a u
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mreal CalcD(char diff, mreal x,mreal y=0,mreal z=0,mreal u=0) const MGL_FUNC_PURE;
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/// Evaluates the formula for 'x, y, z, u, v, w'
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mreal CalcD(char diff, mreal x,mreal y,mreal z,mreal u,mreal v,mreal w) const MGL_FUNC_PURE;
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/// Evaluates the derivates of the formula for variables var respect to variable diff
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mreal CalcD(const mreal var[MGL_VS], char diff) const MGL_FUNC_PURE;
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/// Return error code
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inline int GetError() const { return Error; }
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/// Parse the formula str and create formula-tree
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mglFormula(const char *str);
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/// Clean up formula-tree
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~mglFormula();
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protected:
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mreal CalcIn(const mreal *a1) const MGL_FUNC_PURE;
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mreal CalcDIn(int id, const mreal *a1) const MGL_FUNC_PURE;
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mglFormula *Left,*Right; // first and second argument of the function
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int Kod; // the function ID
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mreal Res; // the number or the variable ID
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static int Error;
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};
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//-----------------------------------------------------------------------------
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#endif
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