Merge pull request #4 from FOSSEE/develop

merging dev into master

1 files changed, 191 insertions, 0 deletions

diff --git a/include/ttl/halfedge/hedart.h b/include/ttl/halfedge/hedart.h
new file mode 100644
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+++ b/include/ttl/halfedge/hedart.h
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+/*
+ * Copyright (C) 1998, 2000-2007, 2010, 2011, 2012, 2013 SINTEF ICT,
+ * Applied Mathematics, Norway.
+ *
+ * Contact information: E-mail: tor.dokken@sintef.no                      
+ * SINTEF ICT, Department of Applied Mathematics,                         
+ * P.O. Box 124 Blindern,                                                 
+ * 0314 Oslo, Norway.                                                     
+ *
+ * This file is part of TTL.
+ *
+ * TTL is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version. 
+ *
+ * TTL 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with TTL. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public
+ * License, a covered work must retain the producer line in every data
+ * file that is created or manipulated using TTL.
+ *
+ * Other Usage
+ * You can be released from the requirements of the license by purchasing
+ * a commercial license. Buying such a license is mandatory as soon as you
+ * develop commercial activities involving the TTL library without
+ * disclosing the source code of your own applications.
+ *
+ * This file may be used in accordance with the terms contained in a
+ * written agreement between you and SINTEF ICT. 
+ */
+
+#ifndef _HALF_EDGE_DART_
+#define _HALF_EDGE_DART_
+
+#include <ttl/halfedge/hetriang.h>
+
+namespace hed
+{
+/**
+ * \class Dart
+ * \brief \b %Dart class for the half-edge data structure.
+ *
+ * See \ref api for a detailed description of how the member functions
+ * should be implemented.
+ */
+class DART
+{
+    EDGE_PTR m_edge;
+
+    /// Dart direction: true if dart is counterclockwise in face
+    bool m_dir;
+
+public:
+    /// Default constructor
+    DART()
+    {
+        m_dir = true;
+    }
+
+    /// Constructor
+    DART( const EDGE_PTR& aEdge, bool aDir = true )
+    {
+        m_edge = aEdge;
+        m_dir = aDir;
+    }
+
+    /// Copy constructor
+    DART( const DART& aDart )
+    {
+        m_edge = aDart.m_edge;
+        m_dir  = aDart.m_dir;
+    }
+
+    /// Destructor
+    ~DART()
+    {
+    }
+
+    /// Assignment operator
+    DART& operator=( const DART& aDart )
+    {
+        if( this == &aDart )
+            return *this;
+
+        m_edge = aDart.m_edge;
+        m_dir = aDart.m_dir;
+
+        return *this;
+    }
+
+    /// Comparing dart objects
+    bool operator==( const DART& aDart ) const
+    {
+        return ( aDart.m_edge == m_edge && aDart.m_dir == m_dir );
+    }
+
+    /// Comparing dart objects
+    bool operator!=( const DART& aDart ) const
+    {
+        return !( aDart == *this );
+    }
+
+    /// Maps the dart to a different node
+    DART& Alpha0()
+    {
+        m_dir = !m_dir;
+        return *this;
+    }
+
+    /// Maps the dart to a different edge
+    DART& Alpha1()
+    {
+        if( m_dir )
+        {
+            m_edge = m_edge->GetNextEdgeInFace()->GetNextEdgeInFace();
+            m_dir = false;
+        }
+        else
+        {
+            m_edge = m_edge->GetNextEdgeInFace();
+            m_dir = true;
+        }
+
+        return *this;
+    }
+
+    /// Maps the dart to a different triangle. \b Note: the dart is not changed if it is at the boundary!
+    DART& Alpha2()
+    {
+        if( m_edge->GetTwinEdge() )
+        {
+            m_edge = m_edge->GetTwinEdge();
+            m_dir = !m_dir;
+        }
+
+        // else, the dart is at the boundary and should not be changed
+        return *this;
+    }
+
+    /** @name Utilities not required by TTL */
+    //@{
+    void Init( const EDGE_PTR& aEdge, bool aDir = true )
+    {
+        m_edge = aEdge;
+        m_dir = aDir;
+    }
+
+    double X() const
+    {
+        return GetNode()->GetX();
+    }
+
+    double Y() const
+    {
+        return GetNode()->GetY();
+    }
+
+    bool IsCCW() const
+    {
+        return m_dir;
+    }
+
+    const NODE_PTR& GetNode() const
+    {
+        return m_dir ? m_edge->GetSourceNode() : m_edge->GetTargetNode();
+    }
+
+    const NODE_PTR& GetOppositeNode() const
+    {
+        return m_dir ? m_edge->GetTargetNode() : m_edge->GetSourceNode();
+    }
+
+    EDGE_PTR& GetEdge()
+    {
+        return m_edge;
+    }
+
+    //@} // End of Utilities not required by TTL
+};
+
+} // End of hed namespace
+
+#endif