lines_from_polygons.cpp

这是一个GPS相关的程序

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//                                                       //
//                         SAGA                          //
//                                                       //
//      System for Automated Geoscientific Analyses      //
//                                                       //
//                    Module Library:                    //
//                     shapes_lines                      //
//                                                       //
//-------------------------------------------------------//
//                                                       //
//                Lines_From_Polygons.cpp                //
//                                                       //
//                 Copyright (C) 2005 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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#include "Lines_From_Polygons.h"


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//---------------------------------------------------------
CLines_From_Polygons::CLines_From_Polygons(void)
{
	CSG_Parameter	*pNode;

	//-----------------------------------------------------
	Set_Name(_TL("Convert Polygons to Lines"));

	Set_Author(_TL("Copyrights (c) 2005 by Olaf Conrad"));

	Set_Description	(_TW(
		"Converts polygon shapes to line shapes.")
	);

	//-----------------------------------------------------
	pNode	= Parameters.Add_Shapes(
		NULL	, "LINES"		, _TL("Lines"),
		_TL(""),
		PARAMETER_OUTPUT, SHAPE_TYPE_Line
	);

	pNode	= Parameters.Add_Shapes(
		NULL	, "POLYGONS"	, _TL("Polygons"),
		_TL(""),
		PARAMETER_INPUT, SHAPE_TYPE_Polygon
	);
}

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


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bool CLines_From_Polygons::On_Execute(void)
{
	int				iShape, iPart, iPoint;
	CSG_Shape			*pLine , *pPolygon;
	CSG_Shapes			*pLines, *pPolygons;

	pPolygons	= Parameters("POLYGONS")	->asShapes();
	pLines		= Parameters("LINES")		->asShapes();

	if(	pPolygons->Get_Count() > 0 )
	{
		pLines->Create(SHAPE_TYPE_Line, pPolygons->Get_Name(), &pPolygons->Get_Table());

		//-------------------------------------------------
		for(iShape=0; iShape<pPolygons->Get_Count(); iShape++)
		{
			pPolygon	= pPolygons	->Get_Shape(iShape);
			pLine		= pLines	->Add_Shape(pPolygon->Get_Record());

			for(iPart=0; iPart<pPolygon->Get_Part_Count(); iPart++)
			{
				for(iPoint=0; iPoint<pPolygon->Get_Point_Count(iPart); iPoint++)
				{
					pLine->Add_Point(pPolygon->Get_Point(iPoint, iPart), iPart);
				}

				pLine->Add_Point(pPolygon->Get_Point(0, iPart), iPart);
			}
		}

		return( true );
	}

	return( false );
}


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