shapes_selection.cpp

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//                                                       //
//                         SAGA                          //
//                                                       //
//      System for Automated Geoscientific Analyses      //
//                                                       //
//           Application Programming Interface           //
//                                                       //
//                  Library: SAGA_API                    //
//                                                       //
//-------------------------------------------------------//
//                                                       //
//                shapes_selection.cpp                   //
//                                                       //
//          Copyright (C) 2005 by Olaf Conrad            //
//                                                       //
//-------------------------------------------------------//
//                                                       //
// This file is part of 'SAGA - System for Automated     //
// Geoscientific Analyses'.                              //
//                                                       //
// This library is free software; you can redistribute   //
// it and/or modify it under the terms of the GNU Lesser //
// General Public License as published by the Free       //
// Software Foundation, either version 2.1 of the        //
// License, or (at your option) any later version.       //
//                                                       //
// 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 Lesser General Public //
// License for more details.                             //
//                                                       //
// You should have received a copy of the GNU Lesser     //
// General Public License along with this program; if    //
// not, see <http://www.gnu.org/licenses/>.              //
//                                                       //
//-------------------------------------------------------//
//                                                       //
//    contact:    Olaf Conrad                            //
//                Institute of Geography                 //
//                University of Goettingen               //
//                Goldschmidtstr. 5                      //
//                37077 Goettingen                       //
//                Germany                                //
//                                                       //
//    e-mail:     oconrad@saga-gis.org                   //
//                                                       //
 
//---------------------------------------------------------
#include "shapes.h"
 

//                                                       //
//                                                       //
//                                                       //
 
//---------------------------------------------------------
bool CSG_Shapes::Select(sLong Index, bool bInvert)
{
        return( CSG_Table::Select(Index, bInvert) );
}
 
//---------------------------------------------------------
bool CSG_Shapes::Select(CSG_Table_Record *pShape, bool bInvert)
{
        return( CSG_Table::Select(pShape, bInvert) );
}
 
//---------------------------------------------------------
bool CSG_Shapes::Select(const TSG_Rect &Extent, bool bInvert)
{
        if( !bInvert )
        {
                CSG_Table::Select();
        }
 
        for(sLong i=0; i<Get_Count(); i++)
        {
                if( Get_Shape(i)->Intersects(Extent) )
                {
                        CSG_Table::Select(i, true);
                }
        }
 
        return( Get_Selection_Count() > 0 );
}
 
//---------------------------------------------------------
bool CSG_Shapes::Select(const TSG_Point &Point, bool bInvert)
{
        if( Get_Type() != SHAPE_TYPE_Polygon )
        {
                return( Select(CSG_Rect(Point, Point), bInvert) );
        }
 
        if( !bInvert )
        {
                CSG_Table::Select();
        }
 
        for(sLong i=0; i<Get_Count(); i++)
        {
                if( ((CSG_Shape_Polygon *)Get_Shape(i))->Contains(Point) )
                {
                        CSG_Table::Select(i, true);
                }
        }
 
        return( Get_Selection_Count() > 0 );
}
 
//---------------------------------------------------------
const CSG_Rect & CSG_Shapes::Get_Selection_Extent(void)
{
        if( Get_Selection_Count() > 0 )
        {
                m_Extent_Selected = ((CSG_Shape *)Get_Selection(0))->Get_Extent();
 
                for(sLong i=1; i<Get_Selection_Count(); i++)
                {
                        m_Extent_Selected.Union(((CSG_Shape *)Get_Selection(i))->Get_Extent());
                }
        }
        else
        {
                m_Extent_Selected.Assign(0., 0., 0., 0.);
        }
 
        return( m_Extent_Selected );
}
 

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