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#ifndef __SP_SELTRANS_H__
#define __SP_SELTRANS_H__

 * Helper object for transforming selected items
 * Author:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 * Copyright (C) 1999-2002 Lauris Kaplinski
 * Released under GNU GPL, read the file 'COPYING' for more information

#include <sigc++/sigc++.h>
#include <libnr/nr-point.h>
#include <libnr/nr-matrix.h>
#include <libnr/nr-rect.h>
#include "desktop-handles.h"
#include "forward.h"
#include "selcue.h"
#include "message-context.h"
#include <vector>

struct SPKnot;
class SPSelTrans;

enum {

enum {

struct SPSelTrans {
      SPSelTrans(SPDesktop *desktop);

      SPDesktop *desktop;

      SPSelection *selection;
      guint state : 1;
      guint show : 1;

      unsigned int grabbed : 1;
      unsigned int show_handles : 1;
      unsigned int empty : 1;
      unsigned int changed : 1;
      std::vector<std::pair<SPItem *,NR::Matrix> > items;
      std::vector<NR::Point> snap_points;
      std::vector<NR::Point> bbox_points;

      NR::Rect box;
      NR::Matrix current;
      NR::Point opposite; ///< opposite point to where a scale is taking place
      NR::Point origin; ///< position of origin for transforms
      NR::Point point; ///< original position of the knot being used for the current transform
      NR::Point center;
      SPKnot *shandle[8];
      SPKnot *rhandle[8];
      SPKnot *chandle;
      SPCanvasItem *norm;
      SPCanvasItem *grip;
      SPCanvasItem *l[4];
      guint sel_changed_id;
      guint sel_modified_id;
      GSList *stamp_cache;

      SPSelCue selcue;

      Inkscape::MessageContext &messageContext() {
            return _message_context;

      SigC::Connection _sel_changed_connection;
      SigC::Connection _sel_modified_connection;
      Inkscape::MessageContext _message_context;

 * Logic
 * grab - removes handles, makes unsensitive
 * ungrab - if changed, flushes, otherwise increases state, shows handles,
 *          makes sensitive
 * if changed or sel changed during grabbing, sets state to scale

void sp_sel_trans_reset_state(SPSelTrans *seltrans);
void sp_sel_trans_increase_state(SPSelTrans *seltrans);
void sp_sel_trans_set_center(SPSelTrans *seltrans, gdouble x, gdouble y);
void sp_sel_trans_update_item_bboxes (SPSelTrans *seltrans);

void sp_sel_trans_grab(SPSelTrans *seltrans, NR::Point const &p, gdouble x, gdouble y, gboolean show_handles);
void sp_sel_trans_transform(SPSelTrans *seltrans, NR::Matrix const &rel_affine, NR::Point const &norm);
void sp_sel_trans_ungrab(SPSelTrans *seltrans);
void sp_sel_trans_stamp(SPSelTrans *seltrans);

inline NR::Point sp_sel_trans_point_desktop(SPSelTrans const *seltrans) {
      return seltrans->point;

inline NR::Point sp_sel_trans_origin_desktop(SPSelTrans const *seltrans) {
      return seltrans->origin;


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