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diff --git a/src/snapper.h b/src/snapper.h
index 2f3c487d6b9bd672f4c987d154f07d6a201408f3..49f2774113d8062ee5afe6942e3f38d6fc8b2847 100644 (file)
--- a/src/snapper.h
+++ b/src/snapper.h
*
* Authors:
* Carl Hetherington <inkscape@carlh.net>
+ * Diederik van Lierop <mail@diedenrezi.nl>
*
* Released under GNU GPL, read the file 'COPYING' for more information.
*/
#include <list>
#include "libnr/nr-coord.h"
#include "libnr/nr-point.h"
+#include <boost/optional.hpp>
+
#include "snapped-point.h"
+#include "snapped-line.h"
+#include "snapped-curve.h"
+#include "snap-preferences.h"
+
+struct SnappedConstraints {
+ std::list<Inkscape::SnappedPoint> points;
+ std::list<Inkscape::SnappedLineSegment> lines;
+ std::list<Inkscape::SnappedLine> grid_lines;
+ std::list<Inkscape::SnappedLine> guide_lines;
+ std::list<Inkscape::SnappedCurve> curves;
+};
-struct SPNamedView;
+class SnapManager;
struct SPItem;
namespace Inkscape
class Snapper
{
public:
- Snapper() {}
- Snapper(SPNamedView const *nv, ::NR::Coord const d);
- virtual ~Snapper() {}
-
- /// Point types to snap.
- typedef int PointType;
- static const PointType SNAP_POINT;
- static const PointType BBOX_POINT;
-
- typedef std::pair<PointType, NR::Point> PointWithType;
-
- void setSnapTo(PointType t, bool s);
- void setDistance(::NR::Coord d);
-
- bool getSnapTo(PointType t) const;
- ::NR::Coord getDistance() const;
+ Snapper() {}
+ Snapper(SnapManager *sm, ::Geom::Coord const t);
+ virtual ~Snapper() {}
- bool willSnapSomething() const;
+ virtual Geom::Coord getSnapperTolerance() const = 0; //returns the tolerance of the snapper in screen pixels (i.e. independent of zoom)
+ virtual bool getSnapperAlwaysSnap() const = 0; //if true, then the snapper will always snap, regardless of its tolerance
- SnappedPoint freeSnap(PointType t,
- NR::Point const &p,
- SPItem const *it) const;
-
- SnappedPoint freeSnap(PointType t,
- NR::Point const &p,
- std::list<SPItem const *> const &it) const;
-
- SnappedPoint constrainedSnap(PointType t,
- NR::Point const &p,
- NR::Point const &c,
- SPItem const *it) const;
+ /**
+ * \return true if this Snapper will snap at least one kind of point.
+ */
+ virtual bool ThisSnapperMightSnap() const {return _snap_enabled;} // will likely be overridden by derived classes
+
+ void setEnabled(bool s); // This is only used for grids, for which snapping can be enabled individually
+ bool getEnabled() const {return _snap_enabled;}
+
+ virtual void freeSnap(SnappedConstraints &/*sc*/,
+ SnapPreferences::PointType const &/*t*/,
+ Geom::Point const &/*p*/,
+ bool const &/*first_point*/,
+ Geom::OptRect const &/*bbox_to_snap*/,
+ std::vector<SPItem const *> const */*it*/,
+ std::vector<Geom::Point> */*unselected_nodes*/) const {};
+
+ class ConstraintLine
+ {
+ public:
+ ConstraintLine(Geom::Point const &d) : _has_point(false), _direction(d) {}
+ ConstraintLine(Geom::Point const &p, Geom::Point const &d) : _has_point(true), _point(p), _direction(d) {}
+
+ bool hasPoint() const {
+ return _has_point;
+ }
+
+ Geom::Point getPoint() const {
+ return _point;
+ }
+
+ Geom::Point getDirection() const {
+ return _direction;
+ }
+
+ void setPoint(Geom::Point const &p) {
+ _point = p;
+ _has_point = true;
+ }
+
+ private:
+
+ bool _has_point;
+ Geom::Point _point;
+ Geom::Point _direction;
+ };
+
+ virtual void constrainedSnap(SnappedConstraints &/*sc*/,
+ SnapPreferences::PointType const &/*t*/,
+ Geom::Point const &/*p*/,
+ bool const &/*first_point*/,
+ Geom::OptRect const &/*bbox_to_snap*/,
+ ConstraintLine const &/*c*/,
+ std::vector<SPItem const *> const */*it*/) const {};
- SnappedPoint constrainedSnap(PointType t,
- NR::Point const &p,
- NR::Point const &c,
- std::list<SPItem const *> const &it) const;
protected:
- SPNamedView const *_named_view;
-
-private:
+ SnapManager *_snapmanager;
- /**
- * Try to snap a point to whatever this snapper is interested in. Any
- * snap that occurs will be to the nearest "interesting" thing (e.g. a
- * grid or guide line)
- *
- * \param p Point to snap (desktop coordinates).
- * \param it Items that should not be snapped to.
- * \return Snapped point.
- */
- virtual SnappedPoint _doFreeSnap(NR::Point const &p,
- std::list<SPItem const *> const &it) const = 0;
-
- /**
- * Try to snap a point to whatever this snapper is interested in, where
- * the snap point is constrained to lie along a specified vector from the
- * original point.
- *
- * \param p Point to snap (desktop coordinates).
- * \param c Vector to constrain the snap to.
- * \param it Items that should not be snapped to.
- * \return Snapped point.
- */
- virtual SnappedPoint _doConstrainedSnap(NR::Point const &p,
- NR::Point const &c,
- std::list<SPItem const *> const &it) const = 0;
-
- ::NR::Coord _distance; ///< snap distance (desktop coordinates)
- int _snap_to; ///< bitmap of point types that we will snap to
+ bool _snap_enabled; ///< true if this snapper is enabled, otherwise false
+ // This is only used for grids, for which snapping can be enabled individually
};
}