mfranz
f91d96b51a
- turn four #include paths from the "foo" form to <foo> The quotes form is normally only used for headers with path relative to the including file's path, though the standard doesn't strictly mandate this. This is consistent with the rest of sg, it makes the code's intent clearer and helps to find headers. (And it's a few milliseconds faster, too.)
103 lines
2.6 KiB
C++
103 lines
2.6 KiB
C++
/**
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* \file interpolater.hxx
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* Routines to handle linear interpolation from a table of x,y The
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* table must be sorted by "x" in ascending order
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*/
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// Written by Curtis Olson, started April 1998.
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//
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// Copyright (C) 1998 Curtis L. Olson - http://www.flightgear.org/~curt
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id$
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#ifndef _INTERPOLATER_H
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#define _INTERPOLATER_H
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#include <simgear/compiler.h>
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#include <simgear/structure/SGReferenced.hxx>
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#include <map>
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#include <string>
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using std::string;
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class SGPropertyNode;
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/**
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* A class that provids a simple linear 2d interpolation lookup table.
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* The actual table is expected to be loaded from a file. The
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* independant variable must be strictly ascending. The dependent
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* variable can be anything.
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*/
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class SGInterpTable : public SGReferenced {
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public:
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/**
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* Constructor. Creates a new, empty table.
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*/
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SGInterpTable();
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/**
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* Constructor. Loads the interpolation table from an interpolation
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* property node.
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* @param interpolation property node having entry children
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*/
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SGInterpTable(const SGPropertyNode* interpolation);
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/**
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* Constructor. Loads the interpolation table from the specified file.
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* @param file name of interpolation file
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*/
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SGInterpTable( const string& file );
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/**
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* Add an entry to the table, extending the table's length.
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*
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* @param ind The independent variable.
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* @param dep The dependent variable.
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*/
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void addEntry (double ind, double dep);
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/**
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* Given an x value, linearly interpolate the y value from the table.
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* @param x independent variable
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* @return interpolated dependent variable
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*/
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double interpolate(double x) const;
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/** Destructor */
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~SGInterpTable();
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private:
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typedef std::map<double, double> Table;
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Table _table;
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};
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#endif // _INTERPOLATER_H
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