/**********************************************************
 * Version $Id$
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///////////////////////////////////////////////////////////
//                                                       //
//                         SAGA                          //
//                                                       //
//      System for Automated Geoscientific Analyses      //
//                                                       //
//                     Tool Library                      //
//                      Grid_Tools                       //
//                                                       //
//-------------------------------------------------------//
//                                                       //
//                  Grid_Value_Type.cpp                  //
//                                                       //
//                 Copyright (C) 2003 by                 //
//                      Olaf Conrad                      //
//                                                       //
//-------------------------------------------------------//
//                                                       //
// This file is part of 'SAGA - System for Automated     //
// Geoscientific Analyses'. SAGA 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.       //
//                                                       //
// SAGA 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, see   //
// <http://www.gnu.org/licenses/>.                       //
//                                                       //
//-------------------------------------------------------//
//                                                       //
//    e-mail:     oconrad@saga-gis.org                   //
//                                                       //
//    contact:    Olaf Conrad                            //
//                Institute of Geography                 //
//                University of Goettingen               //
//                Goldschmidtstr. 5                      //
//                37077 Goettingen                       //
//                Germany                                //
//                                                       //
///////////////////////////////////////////////////////////

//---------------------------------------------------------


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//														 //
//														 //
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//---------------------------------------------------------
#include "Grid_Value_Type.h"


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//														 //
//														 //
//														 //
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//---------------------------------------------------------
CGrid_Value_Type::CGrid_Value_Type(void)
{
	//-----------------------------------------------------
	Set_Name		(_TL("Change Data Storage"));

	Set_Author		("O.Conrad (c) 2003");

	Set_Description	(_TW(
		"Changes a grid's data storage type, offset and scaling, e.g. from 4 byte floating point "
		"to 2 byte signed integer. This might be useful to increase precision or to save memory. "
		"If the target is not set, the original grid's storage type will be changed."
	));

	//-----------------------------------------------------
	Parameters.Add_Grid(
		NULL	, "INPUT"	, _TL("Grid"),
		_TL(""),
		PARAMETER_INPUT
	);

	Parameters.Add_Grid(
		NULL	, "OUTPUT"	, _TL("Converted Grid"),
		_TL(""),
		PARAMETER_OUTPUT_OPTIONAL
	);

	Parameters.Add_Choice(
		NULL	, "TYPE"	, _TL("Data storage type"),
		_TL(""),
		CSG_String::Format(SG_T("%s|%s|%s|%s|%s|%s|%s|%s|%s|"),
			SG_Data_Type_Get_Name(SG_DATATYPE_Bit   ).c_str(),
			SG_Data_Type_Get_Name(SG_DATATYPE_Byte  ).c_str(),
			SG_Data_Type_Get_Name(SG_DATATYPE_Char  ).c_str(),
			SG_Data_Type_Get_Name(SG_DATATYPE_Word  ).c_str(),
			SG_Data_Type_Get_Name(SG_DATATYPE_Short ).c_str(),
			SG_Data_Type_Get_Name(SG_DATATYPE_DWord ).c_str(),
			SG_Data_Type_Get_Name(SG_DATATYPE_Int   ).c_str(),
			SG_Data_Type_Get_Name(SG_DATATYPE_Float ).c_str(),
			SG_Data_Type_Get_Name(SG_DATATYPE_Double).c_str()
		), 7
	);

	Parameters.Add_Value(
		NULL	, "OFFSET"	, _TL("Offset"),
		_TL(""),
		PARAMETER_TYPE_Double, 0.0
	);

	Parameters.Add_Value(
		NULL	, "SCALE"	, _TL("Scale"),
		_TL(""),
		PARAMETER_TYPE_Double, 1.0
	);
}


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//														 //
//														 //
//														 //
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//---------------------------------------------------------
bool CGrid_Value_Type::On_Execute(void)
{
	//-----------------------------------------------------
	CSG_Grid	*pOutput	= Parameters("OUTPUT")->asGrid();
	CSG_Grid	*pInput		= Parameters("INPUT" )->asGrid(), Input;

	if( pOutput == NULL || pOutput == pInput )
	{
		Input.Create(*pInput);
		pOutput	= pInput;
		pInput	= &Input;
	}

	//-----------------------------------------------------
	double	Offset	= Parameters("OFFSET")->asDouble();
	double	Scale	= Parameters("SCALE" )->asDouble();

	if( Scale == 0.0 )
	{
		Error_Set(_TL("scale factor must not equal zero"));

		return( false );
	}

	//-----------------------------------------------------
	switch( Parameters("TYPE")->asInt() )
	{
	default:
		Error_Set(_TL("undefined data type"));

		return( false );

	case 0:	pOutput->Create(Get_System(), SG_DATATYPE_Bit   );	break;
	case 1:	pOutput->Create(Get_System(), SG_DATATYPE_Byte  );	break;
	case 2:	pOutput->Create(Get_System(), SG_DATATYPE_Char  );	break;
	case 3:	pOutput->Create(Get_System(), SG_DATATYPE_Word  );	break;
	case 4:	pOutput->Create(Get_System(), SG_DATATYPE_Short );	break;
	case 5:	pOutput->Create(Get_System(), SG_DATATYPE_DWord );	break;
	case 6:	pOutput->Create(Get_System(), SG_DATATYPE_Int   );	break;
	case 7:	pOutput->Create(Get_System(), SG_DATATYPE_Float );	break;
	case 8:	pOutput->Create(Get_System(), SG_DATATYPE_Double);	break;
	}

	pOutput->Set_Name       (pInput->Get_Name       ());
	pOutput->Set_Description(pInput->Get_Description());
	pOutput->Set_Unit       (pInput->Get_Unit       ());
	pOutput->Set_Scaling    (Scale, Offset);

	//-----------------------------------------------------
	for(int y=0; y<Get_NY() && Set_Progress_Rows(y); y++)
	{
		#pragma omp parallel for
		for(int x=0; x<Get_NX(); x++)
		{
			if( pInput->is_NoData(x, y) )
			{
				pOutput->Set_NoData(x, y);
			}
			else
			{
				pOutput->Set_Value(x, y, pInput->asDouble(x, y));
			}
		}
	}

	//-----------------------------------------------------
	if( pOutput == Parameters("INPUT")->asGrid() )
	{
		DataObject_Update(pOutput);
	}

	return( true );
}


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//---------------------------------------------------------
