-//
-// interpolater.hxx -- routines to handle linear interpolation from a table of
-// x,y The table must be sorted by "x" in ascending order
-//
+/**
+ * \file interpolater.hxx
+ * Routines to handle linear interpolation from a table of x,y The
+ * table must be sorted by "x" in ascending order
+ */
+
// Written by Curtis Olson, started April 1998.
//
-// Copyright (C) 1998 Curtis L. Olson - curt@me.umn.edu
+// Copyright (C) 1998 Curtis L. Olson - http://www.flightgear.org/~curt
//
-// 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 library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library 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
+// This library 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.
+// Library 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// $Id$
#define _INTERPOLATER_H
-#ifndef __cplusplus
+#ifndef __cplusplus
# error This library requires C++
-#endif
+#endif
#include <simgear/compiler.h>
-#include STL_STRING
-FG_USING_STD(string);
+#include <simgear/structure/SGReferenced.hxx>
-#define MAX_TABLE_SIZE 32
+#include <map>
+#include <string>
+using std::string;
-class fgINTERPTABLE {
- int size;
- double table[MAX_TABLE_SIZE][2];
+class SGPropertyNode;
+/**
+ * A class that provids a simple linear 2d interpolation lookup table.
+ * The actual table is expected to be loaded from a file. The
+ * independant variable must be strictly ascending. The dependent
+ * variable can be anything.
+ */
+class SGInterpTable : public SGReferenced {
public:
- // Constructor -- loads the interpolation table from the specified
- // file
- fgINTERPTABLE( const string& file );
-
- // Given an x value, linearly interpolate the y value from the table
- double interpolate(double x);
-
- // Destructor
- ~fgINTERPTABLE( void );
+ /**
+ * Constructor. Creates a new, empty table.
+ */
+ SGInterpTable();
+
+ /**
+ * Constructor. Loads the interpolation table from an interpolation
+ * property node.
+ * @param interpolation property node having entry children
+ */
+ SGInterpTable(const SGPropertyNode* interpolation);
+
+ /**
+ * Constructor. Loads the interpolation table from the specified file.
+ * @param file name of interpolation file
+ */
+ SGInterpTable( const string& file );
+
+
+ /**
+ * Add an entry to the table, extending the table's length.
+ *
+ * @param ind The independent variable.
+ * @param dep The dependent variable.
+ */
+ void addEntry (double ind, double dep);
+
+
+ /**
+ * Given an x value, linearly interpolate the y value from the table.
+ * @param x independent variable
+ * @return interpolated dependent variable
+ */
+ double interpolate(double x) const;
+
+ /** Destructor */
+ ~SGInterpTable();
+
+private:
+ typedef std::map<double, double> Table;
+ Table _table;
};