91 lines
1.9 KiB
C++
91 lines
1.9 KiB
C++
/*
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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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7 Crossings
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7.1 Overview
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This file defines the class ~Crossings~ and its methods.
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Defines and includes.
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*/
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#ifndef SECONDO_CROSSINGS_H
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#define SECONDO_CROSSINGS_H
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#include <vector>
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namespace salr {
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/*
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Forward declaration.
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*/
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class Curve;
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/*
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7.2 Class ~Crossings~
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Used to find intersections between segments and store information about them.
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*/
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class Crossings {
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public:
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/*
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Declaration of constructor.
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*/
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Crossings(double x1, double y1, double x2, double y2);
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/*
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Declaration of custom methods.
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*/
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double getXLo();
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double getYLo();
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double getXHi();
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double getYHi();
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bool isEmpty();
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static bool findCrossings(std::vector<Curve*> *curves,
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double xlo, double ylo,
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double xhi, double yhi);
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bool covers(double ystart, double yend);
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void record(double ystart, double yend, int direction);
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private:
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/*
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Fields used to store information about the crossings found so far by this
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instance.
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*/
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int limit;
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std::vector<double> yranges;
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double xlo, ylo, xhi, yhi;
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};
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}
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#endif //SECONDO_CROSSINGS_H
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