filter.cpp

这是一个GPS相关的程序

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//                                                       //
//                         SAGA                          //
//                                                       //
//      System for Automated Geoscientific Analyses      //
//                                                       //
//                    Module Library:                    //
//                      Grid_Filter                      //
//                                                       //
//-------------------------------------------------------//
//                                                       //
//                      Filter.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; version 2 of the License.   //
//                                                       //
// 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,       //
// write to the Free Software Foundation, Inc.,          //
// 59 Temple Place - Suite 330, Boston, MA 02111-1307,   //
// USA.                                                  //
//                                                       //
//-------------------------------------------------------//
//                                                       //
//    e-mail:     [e-mail]                   //
//                                                       //
//    contact:    Olaf Conrad                            //
//                Institute of Geography                 //
//                University of Goettingen               //
//                Goldschmidtstr. 5                      //
//                37077 Goettingen                       //
//                Germany                                //
//                                                       //
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//---------------------------------------------------------


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//---------------------------------------------------------
#include "Filter.h"


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//---------------------------------------------------------
CFilter::CFilter(void)
{
	//-----------------------------------------------------
	// 1. Info...

	Set_Name(_TL("Simple Filter"));

	Set_Author(_TL("Copyrights (c) 2003 by Olaf Conrad"));

	Set_Description	(_TW(
		"Filter for Grids"
	));


	//-----------------------------------------------------
	// 2. Parameters...

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

	Parameters.Add_Grid(
		NULL, "RESULT"		, _TL("Filtered Grid"),
		_TL(""),
		PARAMETER_OUTPUT_OPTIONAL
	);

	Parameters.Add_Choice(
		NULL, "SEARCH_MODE"	, _TL("Search Mode"),
		_TL(""),
		CSG_String::Format(SG_T("%s|%s|"),
			_TL("Square"),
			_TL("Circle")
		), 1
	);

	Parameters.Add_Choice(
		NULL, "METHOD"		, _TL("Filter"),
		_TL(""),
		CSG_String::Format(SG_T("%s|%s|%s|"),
			_TL("Smooth"),
			_TL("Sharpen"),
			_TL("Edge")
		), 0
	);

	Parameters.Add_Value(
		NULL, "RADIUS"		, _TL("Radius"),
		_TL(""),
		PARAMETER_TYPE_Int, 1, 1, true
	);
}

//---------------------------------------------------------
CFilter::~CFilter(void)
{}


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//---------------------------------------------------------
bool CFilter::On_Execute(void)
{
	int		x, y, Mode, Method, Radius;
	double	Mean;
	CSG_Grid	*pResult;

	//-----------------------------------------------------
	pInput		= Parameters("INPUT")->asGrid();
	Mode		= Parameters("SEARCH_MODE")->asInt();
	Method		= Parameters("METHOD")->asInt();
	Radius		= Parameters("RADIUS")->asInt();

	if( !Parameters("RESULT")->asGrid() )
	{
		Parameters("RESULT")->Set_Value(pInput);
	}

	pResult		= Parameters("RESULT")->asGrid();

	if( !pResult || pResult == pInput )
	{
		pResult	= SG_Create_Grid(pInput);
	}

	pResult->Set_NoData_Value(pInput->Get_NoData_Value());

	switch( Mode )
	{
	case 0:	break;
	case 1:	m_Radius.Create(Radius);	break;
	}

	//-----------------------------------------------------
	for(y=0; y<Get_NY() && Set_Progress(y); y++)
	{
		for(x=0; x<Get_NX(); x++)
		{
			if( pInput->is_InGrid(x, y) )
			{
				switch( Mode )
				{
				case 0:
					Mean	= Get_Mean_Square(x, y, Radius);
					break;

				case 1:
					Mean	= Get_Mean_Circle(x, y);
					break;
				}

				switch( Method )
				{
				case 0:	default:	// Smooth...
					pResult->Set_Value(x, y, Mean);
					break;

				case 1:				// Sharpen...
					pResult->Set_Value(x, y, pInput->asDouble(x, y) + (pInput->asDouble(x, y) - Mean));
					break;

				case 2:				// Edge...
					pResult->Set_Value(x, y, pInput->asDouble(x, y) - Mean);
					break;
				}
			}
		}
	}

	//-----------------------------------------------------
	if( !Parameters("RESULT")->asGrid() || Parameters("RESULT")->asGrid() == pInput )
	{
		pInput->Assign(pResult);

		delete(pResult);
	}

	m_Radius.Destroy();

	return( true );
}


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//---------------------------------------------------------
double CFilter::Get_Mean_Square(int x, int y, int Radius)
{
	int		ax, ay, bx, by, ix, iy, n;
	double	s;

	if( (ax = x - Radius) <  0 )		{	ax	= 0;			}	
	if( (bx = x + Radius) >= Get_NX() )	{	bx	= Get_NX() - 1;	}
	if( (ay = y - Radius) <  0 )		{	ay	= 0;			}
	if( (by = y + Radius) >= Get_NY() )	{	by	= Get_NY() - 1;	}

	for(n=0, s=0.0, iy=ay; iy<=by; iy++)
	{
		for(ix=ax; ix<=bx; ix++)
		{
			if( pInput->is_InGrid(ix, iy) )
			{
				s	+= pInput->asDouble(ix, iy);
				n++;
			}
		}
	}

	return( n > 0 ? s / n : pInput->Get_NoData_Value() );
}

//---------------------------------------------------------
double CFilter::Get_Mean_Circle(int x, int y)
{
	int		i, ix, iy, n;
	double	s;

	for(n=0, s=0.0, i=0; i<m_Radius.Get_nPoints(); i++)
	{
		m_Radius.Get_Point(i, x, y, ix, iy);

		if( pInput->is_InGrid(ix, iy) )
		{
			s	+= pInput->asDouble(ix, iy);
			n++;
		}
	}

	return( n > 0 ? s / n : pInput->Get_NoData_Value() );
}


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