93 lines
1.9 KiB
C++
93 lines
1.9 KiB
C++
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/*
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----
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This file is part of SECONDO.
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Copyright (C) 2004, University in Hagen, Department of Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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1 RegionTools
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This file contains functions handling with regions.
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1.1 Function ~buildRegion~
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This function creates a region from a vector of cycles.
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The cycles must be closed. This means, the first and the
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last point must be the same.
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The outer cycle of a face must be given in clockwise order.
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Inner cycles (holes) must be given in counter-clockwise order.
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You can ensure this using code like:
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---
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if( isFace ){
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if(!getDir(cycle)){
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reverseCycle(cycle);
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}
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} else {
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if(getDir(cycle) ){
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reverseCycle(cycle);
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}
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}
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---
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*/
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#include "SpatialAlgebra.h"
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Region* buildRegion(std::vector< std::vector<Point> >& cycles);
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Region* buildRegion2(std::vector< std::vector<Point> >& cycles);
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/*
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1.2 Function ~getDir~
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This function returns the direction of a cycle as a boolean value.
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It returns true, if the given cycle is in clockwise order. If the
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cycle is directed counter clockwise, the result will be false.
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*/
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bool getDir(const std::vector<Point>& vp);
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/*
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1.3 Function reverse cycle
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This function changes the direction of a cycle.
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*/
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void reverseCycle(std::vector<Point>& cycle);
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