src/snap.h

   1 #ifndef SEEN_SNAP_H
   2 #define SEEN_SNAP_H
   3
   4 /**
   5  * \file snap.h
   6  * \brief SnapManager class.
   7  *
   8  * Authors:
   9  *   Lauris Kaplinski <lauris@kaplinski.com>
  10  *   Frank Felfe <innerspace@iname.com>
  11  *   Carl Hetherington <inkscape@carlh.net>
  12  *   Diederik van Lierop <mail@diedenrezi.nl>
  13  *
  14  * Copyright (C) 2006-2007 Johan Engelen <johan@shouraizou.nl>
  15  * Copyright (C) 2000-2002 Lauris Kaplinski
  16  * Copyright (C) 2000-2008 Authors
  17  *
  18  * Released under GNU GPL, read the file 'COPYING' for more information
  19  */
  20
  21 #include <vector>
  22
  23 #include <libnr/nr-coord.h>
  24 #include <libnr/nr-dim2.h>
  25 #include <libnr/nr-forward.h>
  26 #include <libnr/nr-scale.h>
  27
  28 #include "guide-snapper.h"
  29 #include "object-snapper.h"
  30 #include "snap-preferences.h"
  31
  32 class SPNamedView;
  33
  34 /// Class to coordinate snapping operations
  35
  36 /**
  37  *  Each SPNamedView has one of these.  It offers methods to snap points to whatever
  38  *  snappers are defined (e.g. grid, guides etc.).  It also allows callers to snap
  39  *  points which have undergone some transformation (e.g. translation, scaling etc.)
  40  */
  41
  42 class SnapManager
  43 {
  44 public:
  45     SnapManager(SPNamedView const *v);
  46
  47     typedef std::list<const Inkscape::Snapper*> SnapperList;
  48
  49     bool someSnapperMightSnap() const;
  50
  51     void setup(SPDesktop const *desktop, bool snapindicator = true, SPItem const *item_to_ignore = NULL, std::vector<Geom::Point> *unselected_nodes = NULL);
  52     void setup(SPDesktop const *desktop, bool snapindicator, std::vector<SPItem const *> &items_to_ignore, std::vector<Geom::Point> *unselected_nodes = NULL);
  53
  54     // freeSnapReturnByRef() is preferred over freeSnap(), because it only returns a
  55     // point if snapping has occured (by overwriting p); otherwise p is untouched
  56     void freeSnapReturnByRef(Inkscape::SnapPreferences::PointType point_type,
  57                       Geom::Point &p,
  58                       bool first_point = true,
  59                       Geom::OptRect const &bbox_to_snap = Geom::OptRect()) const;
  60
  61     Inkscape::SnappedPoint freeSnap(Inkscape::SnapPreferences::PointType point_type,
  62                                     Geom::Point const &p,
  63                                     bool first_point = true,
  64                                     Geom::OptRect const &bbox_to_snap = Geom::OptRect() ) const;
  65
  66     Geom::Point multipleOfGridPitch(Geom::Point const &t) const;
  67
  68     // constrainedSnapReturnByRef() is preferred over constrainedSnap(), because it only returns a
  69     // point, by overwriting p, if snapping has occured; otherwise p is untouched
  70     void constrainedSnapReturnByRef(Inkscape::SnapPreferences::PointType point_type,
  71                              Geom::Point &p,
  72                              Inkscape::Snapper::ConstraintLine const &constraint,
  73                              bool first_point = true,
  74                              Geom::OptRect const &bbox_to_snap = Geom::OptRect()) const;
  75
  76     Inkscape::SnappedPoint constrainedSnap(Inkscape::SnapPreferences::PointType point_type,
  77                                            Geom::Point const &p,
  78                                            Inkscape::Snapper::ConstraintLine const &constraint,
  79                                            bool first_point = true,
  80                                            Geom::OptRect const &bbox_to_snap = Geom::OptRect()) const;
  81
  82     void guideSnap(Geom::Point &p, Geom::Point const &guide_normal) const;
  83
  84     Inkscape::SnappedPoint freeSnapTranslation(Inkscape::SnapPreferences::PointType point_type,
  85                                                std::vector<Geom::Point> const &p,
  86                                                Geom::Point const &pointer,
  87                                                Geom::Point const &tr) const;
  88
  89     Inkscape::SnappedPoint constrainedSnapTranslation(Inkscape::SnapPreferences::PointType point_type,
  90                                                       std::vector<Geom::Point> const &p,
  91                                                       Geom::Point const &pointer,
  92                                                       Inkscape::Snapper::ConstraintLine const &constraint,
  93                                                       Geom::Point const &tr) const;
  94
  95     Inkscape::SnappedPoint freeSnapScale(Inkscape::SnapPreferences::PointType point_type,
  96                                          std::vector<Geom::Point> const &p,
  97                                          Geom::Point const &pointer,
  98                                          Geom::Scale const &s,
  99                                          Geom::Point const &o) const;
 100
 101     Inkscape::SnappedPoint constrainedSnapScale(Inkscape::SnapPreferences::PointType point_type,
 102                                                 std::vector<Geom::Point> const &p,
 103                                                 Geom::Point const &pointer,
 104                                                 Geom::Scale const &s,
 105                                                 Geom::Point const &o) const;
 106
 107     Inkscape::SnappedPoint constrainedSnapStretch(Inkscape::SnapPreferences::PointType point_type,
 108                                                   std::vector<Geom::Point> const &p,
 109                                                   Geom::Point const &pointer,
 110                                                   Geom::Coord const &s,
 111                                                   Geom::Point const &o,
 112                                                   Geom::Dim2 d,
 113                                                   bool uniform) const;
 114
 115     Inkscape::SnappedPoint constrainedSnapSkew(Inkscape::SnapPreferences::PointType point_type,
 116                                                std::vector<Geom::Point> const &p,
 117                                                Geom::Point const &pointer,
 118                                                Inkscape::Snapper::ConstraintLine const &constraint,
 119                                                Geom::Point const &s, // s[0] = skew factor, s[1] = scale factor
 120                                                Geom::Point const &o,
 121                                                Geom::Dim2 d) const;
 122
 123     Inkscape::GuideSnapper guide;      ///< guide snapper
 124     Inkscape::ObjectSnapper object;    ///< snapper to other objects
 125     Inkscape::SnapPreferences snapprefs;
 126
 127     SnapperList getSnappers() const;
 128     SnapperList getGridSnappers() const;
 129
 130     SPDesktop const *getDesktop() const {return _desktop;}
 131     SPNamedView const *getNamedView() const {return _named_view;}
 132     SPDocument *getDocument() const;
 133
 134 protected:
 135     SPNamedView const *_named_view;
 136
 137 private:
 138         enum Transformation {
 139         TRANSLATION,
 140         SCALE,
 141         STRETCH,
 142         SKEW
 143     };
 144
 145     std::vector<SPItem const *> *_items_to_ignore;
 146     SPItem const *_item_to_ignore;
 147     SPDesktop const *_desktop;
 148     bool _snapindicator;
 149     std::vector<Geom::Point> *_unselected_nodes;
 150
 151     Inkscape::SnappedPoint _snapTransformed(Inkscape::SnapPreferences::PointType type,
 152                                             std::vector<Geom::Point> const &points,
 153                                             Geom::Point const &pointer,
 154                                             bool constrained,
 155                                             Inkscape::Snapper::ConstraintLine const &constraint,
 156                                             Transformation transformation_type,
 157                                             Geom::Point const &transformation,
 158                                             Geom::Point const &origin,
 159                                             Geom::Dim2 dim,
 160                                             bool uniform) const;
 161
 162     Inkscape::SnappedPoint findBestSnap(Geom::Point const &p, SnappedConstraints &sc, bool constrained) const;
 163 };
 164
 165 #endif /* !SEEN_SNAP_H */
 166
 167 /*
 168   Local Variables:
 169   mode:c++
 170   c-file-style:"stroustrup"
 171   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 172   indent-tabs-mode:nil
 173   fill-column:99
 174   End:
 175 */
 176 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :