/*
 * $Revision: 2585 $
 *
 * last checkin:
 *   $Author: klein $
 *   $Date: 2012-07-12 03:46:50 +0200 (Do, 12. Jul 2012) $
 ***************************************************************/

/** \file
 * \brief Declaration of class GraphAttributes which extends a Graph
 *        by additional attributes.
 *
 * \author Carsten Gutwenger
 *         Karsten Klein
 *         Joachim Kupke
 *         Sebastian Leipert
 *
 * \par License:
 * This file is part of the Open Graph Drawing Framework (OGDF).
 *
 * \par
 * Copyright (C)<br>
 * See README.txt in the root directory of the OGDF installation for details.
 *
 * \par
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * Version 2 or 3 as published by the Free Software Foundation;
 * see the file LICENSE.txt included in the packaging of this file
 * for details.
 *
 * \par
 * This program 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 General Public License for more details.
 *
 * \par
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 * \see  http://www.gnu.org/copyleft/gpl.html
 ***************************************************************/




#ifdef _MSC_VER
#pragma once
#endif

#ifndef OGDF_ATTRIBUTED_GRAPH_H
#define OGDF_ATTRIBUTED_GRAPH_H

#include "NodeArray.h"
#include "EdgeArray.h"
#include "String.h"
#include "geometry.h"

namespace ogdf {

//---------------------------------------------------------
// GraphAttributes
// graph topology + graphical attributes
//---------------------------------------------------------
//! Stores additional attributes of a graph (like layout information).
/**
 * It is frequently necessary to associate additional attributes with a graph.
 * The class GraphAttributes provides various such attributes and is the
 * central place were such attributes are stored.
 *
 * Attributes are simply stored in node or edge arrays; for memory consumption
 * reasons, only a subset of these arrays is in fact initialized for the graph;
 * non-initialized arrays require only a few bytes of extra memory.
 *
 * Which arrays are initialized is specified by a bit vector; each bit in this
 * bit vector corresponds to one or more attributes. E.g., \a #nodeGraphics
 * corresponds to the attributes \a #m_x, \a #m_y, \a #m_width, and \a #m_height;
 * whereas \a #edgeDoubleWeight only corresponds to the attribute \a #m_doubleWeight.
 *
 * Attributes can be initialized by the constructor GraphAttributes(const Graph &,long)
 * or the function initAttributes(); attributes can also be deinitialized by
 * calling destroyAttributes().
 */

class OGDF_EXPORT GraphAttributes {
public:
	//! Types for edge arrows.
	enum EdgeArrow {
		none, //!< no edge arrows
		last, //!< edge arrow at target node of the edge
		first, //!< edge arrow at source node of the edge
		both, //!< edge arrow at target and source node of the edge
		undefined
	};

	//! Types for line styles.
	/**
	 * The line styles are preliminary the same as in QT.
	 */
	enum EdgeStyle {
		esNoPen = 0, //!< no line
		esSolid = 1, //!< solid line
		esDash = 2, //!< dashed line
		esDot = 3, //!< dotted line
		esDashdot = 4, //!< line style "dash dot dash dot ..."
		esDashdotdot = 5
	//!< line style "dash dot dot dash dot dot ..."
	};

	//! Converts integer \a i to edge style.
	static EdgeStyle intToStyle(int i) {
		switch (i) {
		case 0:
			return esNoPen;
		case 1:
			return esSolid;
		case 2:
			return esDash;
		case 3:
			return esDot;
		case 4:
			return esDashdot;
		case 5:
			return esDashdotdot;
		default:
			return esNoPen;

		}
	}

	//! Types for object brush patterns.
	/**
	 * The brush patterns are currently the same as the GDE project.
	 */
	enum BrushPattern {
		bpNone = 0,
		bpSolid = 1,
		bpDense1 = 2,
		bpDense2 = 3,
		bpDense3 = 4,
		bpDense4 = 5,
		bpDense5 = 6,
		bpDense6 = 7,
		bpDense7 = 8,
		bpHorizontal = 9,
		bpVertical = 10,
		bpCross = 11,
		BackwardDiagonal = 12,
		ForwardDiagonal = 13,
		DiagonalCross = 14
	};

	//! Converts integer \a i to brush pattern.
	static BrushPattern intToPattern(int i) {
		switch (i) {
		case 0:
			return bpNone;
			break;
		case 1:
			return bpSolid;
			break;
		case 2:
			return bpDense1;
			break;
		case 3:
			return bpDense2;
			break;
		case 4:
			return bpDense3;
			break;
		case 5:
			return bpDense4;
			break;
		case 6:
			return bpDense5;
			break;
		case 7:
			return bpDense6;
			break;
		case 8:
			return bpDense7;
			break;
		case 9:
			return bpHorizontal;
			break;
		case 10:
			return bpVertical;
			break;
		case 11:
			return bpCross;
			break;
		case 12:
			return BackwardDiagonal;
			break;
		case 13:
			return ForwardDiagonal;
			break;
		case 14:
			return DiagonalCross;
			break;
		default:
			return bpNone;
			break;
		}
	}

	//! Specifies scaling of images.
	enum ImageStyle {
		FreeScale = 0, FixScale = 1
	};
	//! Specifies image alignment.
	enum ImageAlignment {
		TopLeft = 0, TopCenter, TopRight, CenterLeft, Center, CenterRight, BottomLeft, BottomCenter, BottomRight
	};

	//! Helper function mapping int values to image styles
	static ImageStyle intToImageStyle(int i) {
		switch (i) {
		case 0:
			return FreeScale;
			break;
		case 1:
			return FixScale;
			break;
		default:
			return FreeScale;
		}//switch
	}//intToStyle

	//! Helper function mapping int values to image alignment
	static ImageAlignment intToImageAlignment(int i) {
		switch (i) {
		case 0:
			return TopLeft;
			break;
		case 1:
			return TopCenter;
			break;
		case 2:
			return TopRight;
			break;
		case 3:
			return CenterLeft;
			break;
		case 4:
			return Center;
			break;
		case 5:
			return CenterRight;
			break;
		case 6:
			return BottomLeft;
			break;
		case 7:
			return BottomCenter;
			break;
		case 8:
			return BottomRight;
			break;
		default:
			return TopLeft;
		}//switch
	}//intToAlignment

protected:
	/**
	 * Writes string \a str into a GML file such that line length limits
	 * are respected and characters '\', '"' are correctly escaped.
	 */
	void writeLongString(ostream &os, const String &str) const;

	/* Methods for OGML serialization */

	//! Static helper method for mapping edge styles to ogml.
	static const char * edgeStyleToOGML(const GraphAttributes::EdgeStyle & edgeStyle);

	//! Static helper method for mapping image alignments to ogml.
	static const char * imageAlignmentToOGML(const GraphAttributes::ImageAlignment &imgAlign);

	//! Static helper method for mapping image style to ogml.
	static const char * imageStyleToOGML(const GraphAttributes::ImageStyle &imgStyle);

	//! Static helper method for mapping brush patterns styles to ogml.
	static const char * brushPatternToOGML(const GraphAttributes::BrushPattern & brushPattern);

	//static void generateIndent(char ** indent, const int & indentSize);

	//! Static helper method for exchanging X(HT)ML-tag specific chars.
	String formatLabel(const String & labelText);

	/* End methods for OGML serialization */

	const Graph *m_pGraph; //!< associated graph

	bool m_directed; //!< whether or not the graph is directed

	// graphical representation of nodes
	NodeArray<double> m_x; //!< x-coordinate of a node
	NodeArray<double> m_y; //!< y-coordinate pf a node
	NodeArray<double> m_width; //!< width of a node's bounding box
	NodeArray<double> m_height; //!< height of a nodes's bounding box
	NodeArray<String> m_nodeLabel; //!< label of a node
	NodeArray<String> m_nodeColor; //!< color of a node
	NodeArray<String> m_nodeLine; //!< line color of a node
	NodeArray<int> m_nodeShape; //!< shape of a node
	NodeArray<double> m_nodeLineWidth; //!< line width of a node
	NodeArray<BrushPattern> m_nodePattern; //!< brush pattern of a node
	NodeArray<EdgeStyle> m_nodeStyle; //!< line style of a node
	NodeArray<String> m_nodeTemplate; //!< name of template of a node

	// images
	NodeArray<String> m_imageUri;
	NodeArray<ImageStyle> m_imageStyle;
	NodeArray<ImageAlignment> m_imageAlign;
	NodeArray<bool> m_imageDrawLine;
	NodeArray<double> m_imageWidth;
	NodeArray<double> m_imageHeight;

	// other node attributes
	NodeArray<int> m_nodeId; //!< user ID of a node
	NodeArray<int> m_level; //!< level of a node
	NodeArray<int> m_nodeIntWeight; //!< (integer) weight of a node
	NodeArray<Graph::NodeType> m_vType; // type (vertex, dummy, generalizationMerger)

	// graphical representation of edges
	EdgeArray<DPolyline> m_bends; //!< list of bend points of an edge
	EdgeArray<String> m_edgeLabel; //!< label of an edge
	EdgeArray<EdgeArrow> m_edgeArrow; //!< arrow type of an edge
	EdgeArray<EdgeStyle> m_edgeStyle; //!< line style of an edge
	EdgeArray<String> m_edgeColor; //!< line color of an edge
	EdgeArray<double> m_edgeWidth; //!< line width of an edge
	EdgeArray<Graph::EdgeType> m_eType; //!< type of an edge (association or generalization)

	// other edge attributes
	EdgeArray<int> m_intWeight; //!< (integer) weight of an edge
	EdgeArray<double> m_doubleWeight; //!< (real number) weight of an edge
	EdgeArray<unsigned int> m_subGraph; //!< is element of subgraphs given by bitvector

	long m_attributes; //!< bit vector of currently used attributes

public:
	//! Bits for specifying attributes.
	enum {
		nodeGraphics = 0x00001, //!< node attributes m_x, m_y, m_width, m_height, m_nodeShape
		edgeGraphics = 0x00002, //!< edge attribute m_bends
		nodeLevel = 0x00004, //!< node attribute m_level
		edgeIntWeight = 0x00008, //!< edge attribute m_intWeight
		edgeDoubleWeight = 0x00010, //!< edge attribute m_doubleWeight
		edgeLabel = 0x00020, //!< edge attribute m_edgeLabel
		nodeLabel = 0x00040, //!< node attribute m_nodeLabel
		edgeType = 0x00080, //!< edge attribute m_eType
		nodeType = 0x00100, //!< node attribute m_vType
		nodeColor = 0x00200, //!< node attribute m_nodeColor, m_nodeLine
		nodeId = 0x00400, //!< node attribute m_nodeId
		edgeArrow = 0x00800, //!< edge attribute m_edgeArrow
		edgeColor = 0x01000, //!< edge attribute m_edgeColor
		edgeStyle = 0x02000, //!< edge attribute m_edgeStyle, m_edgeWidth
		nodeStyle = 0x04000, //!< node attributes m_nodePattern, m_nodeStyle, m_nodeLineWidth;
		//!< experimental: m_imageUri, m_imageStyle, m_imageAlign,
		//!< m_imageDrawLine, m_imageWidth, m_imageHeight
		nodeTemplate = 0x08000, //!< node attribute m_nodeTemplate
		edgeSubGraph = 0x10000, //!< edge attribute m_subGraph
		nodeWeight = 0x20000
	//!< node attribute m_nodeIntWeight
	};

	//! Bits for specifying node shapes.
	enum {
		oval = 0x8001, rectangle = 0x8002
	};

	//! Constructs graph attributes for no associated graph (default constructor).
	/**
	 * The associated graph can be set later with the init() function.
	 */
	GraphAttributes();

	//! Constructs graph attributes associated with the graph \a G.
	/**
	 * @param G is the associated graph.
	 * @param initAttributes specifies the set of attributes that can be accessed.
	 */
	GraphAttributes(const Graph &G, long initAttributes = nodeGraphics | edgeGraphics);

	virtual ~GraphAttributes() {
	}

	//! Initializes the graph attributes for graph \a G.
	/**
	 * @param G is the new associated graph.
	 * @param initAttr specifies the set of attributes that can be accessed.
	 *
	 * \warning All attributes that were allocated before are destroyed by this function!
	 *  If you wish to extend the set of allocated attributes, use initAttributes().
	 */
	virtual void init(const Graph &G, long initAttr);

	//! Returns currently accessible attributes.
	long attributes() const {
		return m_attributes;
	}

	//! Initializes attributes in \a attr for usage.
	void initAttributes(long attr);

	//! Destroys attributes in attr.
	void destroyAttributes(long attr);

	//! Returns a reference to the associated graph
	const Graph& constGraph() const {
		return *m_pGraph;
	}

	//! Returns if the graph is directed.
	bool directed() {
		return m_directed;
	}

	//! Sets if the graph is directed to \a directed.
	void directed(bool directed) {
		m_directed = directed;
	}

	//! Returns the template name of node \a v.
	const String &templateNode(node v) const {
		return m_nodeTemplate[v];
	}
	//! Returns the template name of node \a v.
	String &templateNode(node v) {
		return m_nodeTemplate[v];
	}

	//! Returns the x-coordinate of node \a v.
	const double &x(node v) const {
		return m_x[v];
	}
	//! Returns the x-coordinate of node \a v.
	double &x(node v) {
		return m_x[v];
	}

	//! Returns the y-coordinate of node \a v.
	const double &y(node v) const {
		return m_y[v];
	}
	//! Returns the y-coordinate of node \a v.
	double &y(node v) {
		return m_y[v];
	}

	//! Returns a reference to the NodeArray \a m_width.
	const NodeArray<double> &width() const {
		return m_width;
	}
	//! Returns a refeence to the NodeArray \a m_width.
	NodeArray<double> &width() {
		return m_width;
	}

	//! Returns the width of the bounding box of node \a v.
	const double &width(node v) const {
		return m_width[v];
	}
	//! Returns the width of the bounding box of node \a v.
	double &width(node v) {
		return m_width[v];
	}

	//! Returns a reference to the NodeArray \a m_height.
	const NodeArray<double> &height() const {
		return m_height;
	}
	//! Returns a refeence to the NodeArray \a m_height.
	NodeArray<double> &height() {
		return m_height;
	}

	//! Returns the height of the bounding box of node \a v.
	const double &height(node v) const {
		return m_height[v];
	}
	//! Returns the height of the bounding box of node \a v.
	double &height(node v) {
		return m_height[v];
	}

	//! Returns the level of node \a v.
	const int &level(node v) const {
		return m_level[v];
	}
	//! Returns the level of node \a v.
	int &level(node v) {
		return m_level[v];
	}

	//! Returns the weight of node \a v.
	const int &weight(node v) const {
		return m_nodeIntWeight[v];
	}
	//! Returns the weight of node \a v.
	int &weight(node v) {
		return m_nodeIntWeight[v];
	}

	//! Returns the brush pattern of node \a v.
	const BrushPattern &nodePattern(node v) const {
		return m_nodePattern[v];
	}
	//! Returns the brush pattern of node \a v.
	BrushPattern &nodePattern(node v) {
		return m_nodePattern[v];
	}

	//! Returns the line style of node \ v.
	const EdgeStyle &styleNode(node v) const {
		return m_nodeStyle[v];
	}
	//! Returns the line style of node \ v.
	EdgeStyle &styleNode(node v) {
		return m_nodeStyle[v];
	}

	//! Returns the line width of node \a v.
	const double &lineWidthNode(node v) const {
		return m_nodeLineWidth[v];
	}
	//! Returns the line width of node \a v.
	double &lineWidthNode(node v) {
		return m_nodeLineWidth[v];
	}

	//! Returns the line color of node \a v.
	const String &nodeLine(node v) const {
		return m_nodeLine[v];
	}
	//! Returns the line color of node \a v.
	String &nodeLine(node v) {
		return m_nodeLine[v];
	}

	//! Returns the list of bend points of edge \a e.
	const DPolyline &bends(edge e) const {
		return m_bends[e];
	}
	//! Returns the list of bend points of edge \a e.
	DPolyline &bends(edge e) {
		return m_bends[e];
	}

	//! Returns the (integer) weight of edge \a e.
	const int &intWeight(edge e) const {
		return m_intWeight[e];
	}
	//! Returns the (integer) weight of edge \a e.
	int &intWeight(edge e) {
		return m_intWeight[e];
	}

	//! Returns the (real number) weight of edge \a e.
	const double &doubleWeight(edge e) const {
		return m_doubleWeight[e];
	}
	//! Returns the (real number) weight of edge \a e.
	double &doubleWeight(edge e) {
		return m_doubleWeight[e];
	}

	//! Returns the line width of edge \a e.
	const double &edgeWidth(edge e) const {
		return m_edgeWidth[e];
	}
	//! Returns the line width of edge \a e.
	double &edgeWidth(edge e) {
		return m_edgeWidth[e];
	}

	//! Returns the color of node \a v.
	const String &colorNode(node v) const {
		return m_nodeColor[v];
	}
	//! Returns the color of node \a v.
	String &colorNode(node v) {
		return m_nodeColor[v];
	}

	//! Returns the shape type of node \a v.
	int shapeNode(node v) const {
		return m_nodeShape[v];
	}
	//! Returns the shape type of node \a v.
	int &shapeNode(node v) {
		return m_nodeShape[v];
	}

	//! Returns the label of node \ v.
	const String &labelNode(node v) const {
		return m_nodeLabel[v];
	}
	//! Returns the label of node \ v.
	String &labelNode(node v) {
		return m_nodeLabel[v];
	}

	//! Returns the label of edge \a e.
	const String &labelEdge(edge e) const {
		return m_edgeLabel[e];
	}
	//! Returns the label of edge \a e.
	String &labelEdge(edge e) {
		return m_edgeLabel[e];
	}

	//! Returns the type of edge \a e.
	Graph::EdgeType type(edge e) const {
		return m_eType.valid() ? m_eType[e] : Graph::association;
	}
	//! Returns the type of edge \a e.
	Graph::EdgeType &type(edge e) {
		return m_eType[e];
	}

	//! Returns the type of node \a v.
	Graph::NodeType type(node v) const {
		return m_vType.valid() ? m_vType[v] : Graph::vertex;
	}
	//! Returns the type of node \a v.
	Graph::NodeType &type(node v) {
		return m_vType[v];
	}

	//! Returns the user ID of node \a v.
	const int &idNode(node v) const {
		return m_nodeId[v];
	}
	//! Returns the user ID of node \a v.
	int &idNode(node v) {
		return m_nodeId[v];
	}

	//! Returns the arrow type of edge \a e.
	const EdgeArrow &arrowEdge(edge e) const {
		return m_edgeArrow[e];
	}
	//! Returns the arrow type of edge \a e.
	EdgeArrow &arrowEdge(edge e) {
		return m_edgeArrow[e];
	}

	//! Returns the line style of an edge \a e.
	const EdgeStyle &styleEdge(edge e) const {
		return m_edgeStyle[e];
	}
	//! Returns the line style of an edge \a e.
	EdgeStyle &styleEdge(edge e) {
		return m_edgeStyle[e];
	}

	//! Returns the color of node \a v.
	const String &colorEdge(edge e) const {
		return m_edgeColor[e];
	}
	//! Returns the color of node \a v.
	String &colorEdge(edge e) {
		return m_edgeColor[e];
	}

	// Images:
	//! Returns image uri of node v.
	const String &imageUriNode(node v) const {
		return m_imageUri[v];
	}
	//! Returns image uri of node v.
	String &imageUriNode(node v) {
		return m_imageUri[v];
	}
	//! Returns image style of node v.
	const ImageStyle &imageStyleNode(node v) const {
		return m_imageStyle[v];
	}
	//! Returns image style of node v.
	ImageStyle &imageStyleNode(node v) {
		return m_imageStyle[v];
	}
	// Returns image alignment of node v.
	const ImageAlignment &imageAlignmentNode(node v) const {
		return m_imageAlign[v];
	}
	// Returns image alignment of node v.
	ImageAlignment &imageAlignmentNode(node v) {
		return m_imageAlign[v];
	}
	//! Returns bool value drawLine of node v.
	const bool &imageDrawLineNode(node v) const {
		return m_imageDrawLine[v];
	}
	//! Returns bool value drawLine of node v.
	bool &imageDrawLineNode(node v) {
		return m_imageDrawLine[v];
	}
	//! Returns image width of node v.
	const double &imageWidthNode(node v) const {
		return m_imageWidth[v];
	}
	//! Returns image width of node v.
	double &imageWidthNode(node v) {
		return m_imageWidth[v];
	}
	// Returns image height of node v.
	const double &imageHeightNode(node v) const {
		return m_imageHeight[v];
	}
	// Returns image height of node v.
	double &imageHeightNode(node v) {
		return m_imageHeight[v];
	}

	//! Returns the edgesubgraph value of an edge \a e.
	const unsigned int &subGraphBits(edge e) const {
		return m_subGraph[e];
	}
	//! Returns the edgesubgraph value of an edge \a e.
	unsigned int &subGraphBits(edge e) {
		return m_subGraph[e];
	}

	//! Checks whether edge \a e belongs to basic graph \a n.
	bool inSubGraph(edge e, int n) const {
		OGDF_ASSERT( n>=0 && n<32 );
		return (m_subGraph[e] & (1 << n)) != 0;
	}
	//! Addes edge \a e to basic graph \a n.
	void addSubGraph(edge e, int n) {
		OGDF_ASSERT( n>=0 && n<32 );
		m_subGraph[e] |= (1 << n);
	}
	//! Removes edge \a e from basic graph \a n.
	void removeSubGraph(edge e, int n) {
		OGDF_ASSERT( n>=0 && n<32 );
		m_subGraph[e] &= ~(1 << n);
	}

	//! Returns the bounding box of the graph.
	const DRect boundingBox() const;

	/**
	 * We hide the internal representation of semantic node types from
	 * the user to be able to change this later (semantic node type member array).
	 * We are not allowed to set association classes manually, only by calling
	 * createAssociationClass().
	 */
	bool isAssociationClass(node v) const {
		return (type(v) == Graph::associationClass);
	}

	/**
	 * According to the \a mode switch add either the node center points to
	 * the bends or the anchor point on the node boundary
	 *   - \a mode = 0: only add node center
	 *   - \a mode = 1: compute intersection with the line segment to the center
	 *     and the boundary of the rectangular node
	 *   - \a mode = 2: compute intersection with the first/last line segment
	 *     and the boundary of the rectangular node
	 */
	void addNodeCenter2Bends(int mode = 1);

	void clearAllBends();

	//! Returns a list of all inheritance hierarchies in the graph.
	/**
	 * Inheritance hierarchies are identified by edges with type Graph::generalization.
	 *
	 * @param list is a list of all hierarchies; each hierarchie is itself a list
	 *        of all nodes in this hierarchy.
	 *
	 * \return Returns the number of generalization hierarchies.
	 */
	int hierarchyList(List<List<node>*> &list) const;

	//! Returns a list of all inheritance hierarchies in the graph.
	/**
	 * Inheritance hierarchies are identified by edges with type Graph::generalization.
	 *
	 * @param list is a list of all hierarchies; each hierarchie is itself a list
	 *        of all edges in this hierarchy.
	 *
	 * \return Returns the number of generalization hierarchies.
	 */
	int hierarchyList(List<List<edge>*> &list) const;

	//! Sets the width of all nodes to \a w.
	void setAllWidth(double w);
	//! Sets the height of all nodes to \a h.
	void setAllHeight(double h);

	//! Reads the graph from a GML file \a fileName.
	bool readGML(Graph &G, const String &fileName);

	//! Reads the graph from a GML input stream \a is.
	bool readGML(Graph &G, istream &is);

	//! Writes the graph with its attributes in GML format to file \a fileName.
	void writeGML(const String &fileName) const;

	//! Writes the graph with its attributes in GML format to output stream \a os.
	void writeGML(ostream &os) const;

	//! Writes the graph with its attributes in SVG format to file \a fileName.
	/**
	 * @param fileName filename of the SVG
	 * @param fontSize size of node label (default = 3)
	 * @param fontColor color of node label (default = #000000)
	 */
	void writeSVG(const String &fileName, int fontSize = 3, const String &fontColor = "#000000") const;

	//! Writes the graph with its attributes in SVG format to output stream \a os.
	/**
	 * @param os output stream for SVG
	 * @param fontSize size of node label
	 * @param fontColor color of node label
	 */
	void writeSVG(ostream &os, int fontSize, const String &fontColor) const;

	//! Reads the graph and attributes from the XML file \a fileName.
	bool readXML(Graph &G, const String &fileName);

	//! Reads the graph and attributes from the XML input stream \a is.
	bool readXML(Graph &G, istream &is);

	//! Writes the graph to the XML file \a fileName.
	void writeXML(const String &fileName, const char* delimiter = "", const char* offset = "") const;

	//! Writes the graph to XML output stream \a os.
	virtual void writeXML(ostream &os, const char* delimiter = "", const char* offset = "") const;

	//! Reads a graph in Rudy format from file \a fileName.
	bool readRudy(Graph &G, const String &fileName);

	//! Reads a graph in Rudy format from input stream \a is.
	bool readRudy(Graph &G, istream &is);

	//! Writes the graph in Rudy format to file \a fileName.
	void writeRudy(const String &fileName) const;

	//! Writes the graph in Rudy format to output stream \a os.
	void writeRudy(ostream &os) const;

	//! Removes unnecessary bend points in orthogonal segements.
	/**
	 * Processes all edges and removes unnecessary bend points in the bend point list
	 * of the edge, i.e., bend points such that the preceding and succeeding bend point
	 * form a horizontal or vertical segement containing this bend point. This function
	 * is useful to remove redundant bend points in an orthogonal layout.
	 */
	void removeUnnecessaryBendsHV();
};

} // end namespace ogdf


#endif