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diff --git a/src/dotgraph.h b/src/dotgraph.h
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+/******************************************************************************
+ *
+ * Copyright (C) 1997-2019 by Dimitri van Heesch.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation under the terms of the GNU General Public License is hereby
+ * granted. No representations are made about the suitability of this software
+ * for any purpose. It is provided "as is" without express or implied warranty.
+ * See the GNU General Public License for more details.
+ *
+ * Documents produced by Doxygen are derivative works derived from the
+ * input used in their production; they are not affected by this license.
+ *
+ */
+
+#ifndef DOTGRAPH_H
+#define DOTGRAPH_H
+
+#include <qcstring.h>
+#include <qgstring.h>
+#include <qdir.h>
+
+class FTextStream;
+class DotNode;
+
+enum GraphOutputFormat    { GOF_BITMAP, GOF_EPS };
+enum EmbeddedOutputFormat { EOF_Html, EOF_LaTeX, EOF_Rtf, EOF_DocBook };
+enum GraphType            { Dependency, Inheritance, Collaboration, Hierarchy, CallGraph };
+
+/** A dot graph */
+class DotGraph
+{
+  public:
+    DotGraph() : m_curNodeNumber(0), m_doNotAddImageToIndex(FALSE), m_noDivTag(FALSE), m_zoomable(TRUE), m_urlOnly(FALSE) {}
+    virtual ~DotGraph() {}
+
+    static QCString DOT_FONTNAME; // will be initialized in initDot
+    static int DOT_FONTSIZE;      // will be initialized in initDot
+
+    static bool writeVecGfxFigure(FTextStream& out, const QCString& baseName, const QCString& figureName);
+
+  protected:
+    /** returns node numbers. The Counter is reset by the constructor */
+    int getNextNodeNumber() { return ++m_curNodeNumber; }
+
+    QCString writeGraph(FTextStream &t,
+                        GraphOutputFormat gf,
+                        EmbeddedOutputFormat ef,
+                        const char *path,
+                        const char *fileName,
+                        const char *relPath,
+                        bool writeImageMap=TRUE,
+                        int graphId=-1
+                       );
+
+    static void writeGraphHeader(FTextStream& t, const QCString& title = QCString());
+    static void writeGraphFooter(FTextStream& t);
+    static void computeGraph(DotNode* root,
+                             GraphType gt,
+                             GraphOutputFormat format,
+                             const QCString& rank, // either "LR", "RL", or ""
+                             bool renderParents,
+                             bool backArrows,
+                             const QCString& title,
+                             QGString& graphStr
+                            );
+
+    virtual QCString getBaseName() const = 0;
+    virtual QCString absMapName()  const { return m_absPath + m_baseName + ".map"; }
+    virtual QCString getMapLabel() const = 0;
+    virtual QCString getImgAltText() const { return ""; }
+
+    virtual void computeTheGraph() = 0;
+
+    static QCString IMG_EXT;
+
+    friend void initDot();
+
+    QCString absBaseName() const { return m_absPath + m_baseName; }
+    QCString absDotName()  const { return m_absPath + m_baseName + ".dot"; }
+    QCString imgName()     const;
+    QCString absImgName()  const { return m_absPath + imgName(); }
+    QCString relImgName()  const { return m_relPath + imgName(); }
+
+    // the following variables are used while writing the graph to a .dot file
+    GraphOutputFormat      m_graphFormat;
+    EmbeddedOutputFormat   m_textFormat;
+    QDir                   m_dir;
+    QCString               m_fileName;
+    QCString               m_relPath;
+    bool                   m_generateImageMap;
+    int                    m_graphId;
+
+    QCString               m_absPath;
+    QCString               m_baseName;
+    QGString               m_theGraph;
+    bool                   m_regenerate;
+    bool                   m_doNotAddImageToIndex;
+    bool                   m_noDivTag;
+    bool                   m_zoomable;
+    bool                   m_urlOnly;
+
+  private:
+    DotGraph(const DotGraph &);
+    DotGraph &operator=(const DotGraph &);
+
+    bool prepareDotFile();
+    void generateCode(FTextStream &t);
+
+    int m_curNodeNumber;
+};
+
+#endif