/* -*- C++ -*-

  $Id: GObject.h,v 1.23 1999/02/09 20:45:17 sattler Exp $

  This file is part of KIllustrator.
  Copyright (C) 1998 Kai-Uwe Sattler (kus@iti.cs.uni-magdeburg.de)

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU Library General Public License as
  published by  
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  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.
  
  You should have received a copy of the GNU Library General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef GObject_h_
#define GObject_h_

#include <string>
#include <map>

#include <qobject.h>
#include <qcolor.h>
#include <qfont.h>
#include <qwmatrix.h>
#include <qpainter.h>
#include <qdstream.h>
#include <qdict.h>
#include <qlist.h>

#include "Gradient.h"
#include "Coord.h"
#include "Painter.h"
#include "GradientShape.h"

#include "xmlutils/XmlWriter.h"
#include "xmlutils/XmlElement.h"

#ifndef M_PI // not ANSI C++, so it maybe...
#define M_PI            3.14159265358979323846  /* pi */
#endif

#define RAD_FACTOR 180.0 / M_PI

class GOState;
class GLayer;
class SWrapper;

/**
 * The base class for all graphical objects.
 *
 * Documentation
 *
 * @author  Kai-Uwe Sattler (kus@iti.cs.uni-magdeburg.de)
 * @version $Revision: 1.23 $
 */
class GObject : public QObject {
  Q_OBJECT
protected:
  GObject ();
  GObject (const list<XmlAttribute>& attribs);
  GObject (const GObject& obj);

  virtual void initState (GOState* state);

  void updateRegion (bool recalcBBox = true);

public:
    enum Property { Prop_Outline, Prop_Fill };

  struct OutlineInfo {
    enum { 
      Color = 1, Style = 2, Width = 4, Custom = 8, All = 15
    };
    unsigned int mask;   // indicates the valid fields of the structure
    QColor color;        // outline color
    PenStyle style;      // outline style
    float width;         // outline width
    // custom properties (depend on object type)
    float roundness;     // roundness for rectangles
    enum Shape { 
      DefaultShape, ArcShape, PieShape 
    };           
    Shape shape;         // shape of ellipse 
    int startArrowId,    // arrow heads (for lines and bezier curves)
      endArrowId;
  };

  struct FillInfo {
    enum { Color = 1, FillStyle = 2, Pattern = 4, GradientInfo = 8, All = 15 };
    enum Style { 
      NoFill, SolidFill, PatternFill, TileFill, GradientFill 
    };
    unsigned int mask;  // indicates the valid fields of the structure
    QColor color;       // fill color
    BrushStyle pattern; // pattern
    Style fstyle;       // fill style
    Gradient gradient;  // gradient info
  };

  static void setDefaultOutlineInfo (const OutlineInfo& oi);
  static void setDefaultFillInfo (const FillInfo& fi);
  static OutlineInfo getDefaultOutlineInfo ();
  static FillInfo getDefaultFillInfo ();

  /**
   * The destructor.
   */
  virtual ~GObject ();

  /**
   * Set the outline properties for the object.
   *
   * @param info The outline info structure.
   */
  void setOutlineInfo (const OutlineInfo& info);

  /**
   * Retrieve the outline properties of the object.
   *
   * @return A structure with all outline properties.
   */
  OutlineInfo getOutlineInfo () const;

  /**
   * Set the ouline color of the object.
   * 
   * @param c The outline color.
   */
  void setOutlineColor (const QColor& c);

  /**
   * Set the style of the ouline.
   *
   * @param p The outline pen style.
   */
  void setOutlineStyle (PenStyle p);

  /**
   * Set the ouline width.
   *
   * @param width The width of the outline.
   */
  void setOutlineWidth (float width);

  void setOutlineShape (OutlineInfo::Shape s);

  /**
   * Retrieve the color of the object outline.
   *
   * @return The ouline color.
   */
  const QColor& getOutlineColor () const;

  /**
   * Retrieve the style of the ouline pen.
   *
   * @return The pen style.
   */
  PenStyle getOutlineStyle () const;

  /**
   * Retireve the width of the ouline pen.
   *
   * @return The outline width.
   */
  float getOutlineWidth () const;

  /**
   * Set the fill properties for the object.
   *
   * @param info The FillInfo structure with all properties.
   */
  void setFillInfo (const FillInfo& info);

  /**
   * Retrieve the fill properties of the object.
   *
   * @return The FillInfo properties.
   */
  FillInfo getFillInfo () const;

  /**
   * Set the fill color.
   *
   * @param c The color for filling the object.
   */
  void setFillColor (const QColor& c);

  /**
   * Set the fill style of the object.
   *
   * @param b the brush style for fillig the object.
   */
  void setFillStyle (FillInfo::Style s);

  void setFillGradient (const Gradient& g);

  void setFillPattern (BrushStyle b);

  /**
   * Retrieve the fill color.
   *
   * @return The color.
   */
  const QColor& getFillColor () const;

  /**
   * Retrieve the brush style of object filling.
   *
   * @return The brush style.
   */
  FillInfo::Style getFillStyle () const;

  const Gradient& getFillGradient () const;

  BrushStyle getFillPattern () const;

  /**
   * Retrieve the transformation matrix associated with the object.
   *
   * @return The current matrix.
   */
  const QWMatrix& matrix () const { return tMatrix; }
  
  /**
   * Initialize a temporary matrix for transformation from the values of
   * the transformation matrix. The temporary matrix is used by interactive
   * tools like the SelectionTool.
   */
  void initTmpMatrix ();

  /**
   * Transform the object according to the given matrix.
   *
   * @param m      The matrix for combining with the current transformation
   *               matrix.
   * @param update if true, the bounding box of the object is immediatly 
   *               updated, otherwise not. This is usefull for a sequence of
   *               transformations in order to avoid flickering.
   */
  void transform (const QWMatrix& m, bool update = false);

  /**
   * Transform the object temporary according to the given matrix. The 
   * transformation matrix is not modified.
   *
   * @param m      The matrix for combining with the current transformation
   *               matrix.
   * @param update if true, the bounding box of the object is immediatly 
   *               updated, otherwise not.
   * @see
   */
  void ttransform (const QWMatrix& m, bool update = false);
  
  /**
   * Mark the object as selected or not selected.
   *
   * @param flag if true, the object is selected, otherwise the object will 
   *             be unselected.
   */
  virtual void select (bool flag = true);

  /**
   * Retrieve the selection status of the object.
   *
   * @return true, if the object is selected, otherwise false.
   */
  bool isSelected () const { return sflag; }

  virtual bool isValid () { return true; }

  bool gradientFill () const { 
    return fillInfo.fstyle == GObject::FillInfo::GradientFill;
  }
  
  /**
   * Retrieve the bounding box for the object.
   *
   * @return The rectangle with the bounding box parameters.
   */
  const Rect& boundingBox () const { return box; }
  virtual const Rect& redrawBox () const { return box; }

  void setLayer (GLayer* l);
  GLayer* getLayer () { return layer; }

  void writePropertiesToXml (XmlWriter& xml);

  void ref ();
  void unref ();
  unsigned int ref_count () const { return rcount; }

  virtual const char* typeName () = 0;

  virtual GOState* saveState ();
  virtual void restoreState (GOState* state);

  virtual int getNeighbourPoint (const Coord& p) { return -1; }
  virtual void movePoint (int idx, float dx, float dy) {}

  /**
   * Draw the object with the given painter.
   * NOTE: This method has to be implemented in every subclass.
   *
   * @param p The Painter for drawing the object.
   * @param withBasePoints If true, draw the base points of the 
   *                       object.
   */
  virtual void draw (Painter& p, bool withBasePoints = false,
		     bool outline = false) {}

  /**
   * Test, if the object contains the given point.
   * NOTE: This method has to be implemented in every subclass.
   *
   * @param p  The coodinates of a point.
   * @return   true, if the object contains the point, otherwise false.
   */
  virtual bool contains (const Coord& p);

  virtual bool intersects (const Rect& r);

  /**
   * Create a new object with identical properties.
   * NOTE: This method has to be implemented in every subclass.
   *
   * @return A copy of this object.
   */
  virtual GObject* copy () = 0;
  virtual GObject* clone (const list<XmlAttribute>& attribs) = 0;

  virtual void writeToXml (XmlWriter&) = 0;

  /**
   * At the moment only valid for lines and bezier curves.
   */
  virtual bool findNearestPoint (const Coord& p, float max_dist, 
				 float& dist, int& pidx) { return false; }

  virtual void printInfo ();
  virtual void calcBoundingBox () = 0;

  virtual void getPath (vector<Coord>& path) {}

  bool workInProgress () const { return inWork; }
  void setWorkInProgress (bool flag) { inWork = flag; }

  void invalidateClipRegion  ();

  // used for saving/restoring of object connections (like text on path)
  const char* getId ();
  bool hasId () const { return ! id.isEmpty (); }

  const char* getRefId () { return (const char *) refid; }
  bool hasRefId () const { return ! refid.isEmpty (); }

  void setWrapper (SWrapper *wobj);
  SWrapper* getWrapper () { return wrapper; }

  static void registerPrototype (const char* className, GObject *proto);
  static GObject* lookupPrototype (const char *className);

signals:
  void deleted ();
  void changed ();
  void changed (const Rect& r);
  void propertiesChanged (GObject::Property p, int mask);
  
protected:
  void initBrush (QBrush& b);
  void initPen (QPen& p);

  void updateBoundingBox (const Rect& r);
  void updateBoundingBox (const Coord& p1, const Coord& p2);

  void calcUntransformedBoundingBox (const Coord& tleft, const Coord& tright,
				     const Coord& bright, const Coord& bleft);
  
  bool sflag;              // object is selected
  Rect box;                // the bounding box
  QWMatrix tMatrix;        // transformation matrix
  QWMatrix tmpMatrix;      // temporary transformation matrix
  QWMatrix iMatrix;        // inverted transformation matrix
  OutlineInfo outlineInfo; // outline attributes
  FillInfo fillInfo;       // fill attributes
  unsigned int rcount;     // the reference counter
  GLayer *layer;           // the layer containing this object
  GradientShape gShape;    // the shape (clipped pixmap) for gradient fill
  bool inWork;             // the object is currently manipulated,
                           // so don't fill it now

  QString id, refid;
  SWrapper* wrapper;       // Wrapper object for scripting purposes

  // default value
  static OutlineInfo defaultOutlineInfo;
  static FillInfo defaultFillInfo;

  static map<string, GObject*> prototypes;
};

class GOState {
  friend class GObject;
protected:
  GOState () : rcount (1) {}

public:
  // should be protected, but ...
  virtual ~GOState () {}

  void ref () { rcount++; }
  void unref () { if (--rcount == 0) delete this; }

private:
  QWMatrix matrix;
  GObject::OutlineInfo oInfo;
  GObject::FillInfo fInfo;
  unsigned int rcount;
};

class SWrapper {
protected:
  SWrapper () : obj (0L) {}
  
public:
  void setObject (GObject* o) { obj = o; }

protected:
  GObject* obj;
};

#endif