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/**
* \file src/snapper.cpp
* \brief Snapper class.
*
* Authors:
* Carl Hetherington <inkscape@carlh.net>
*
* Released under GNU GPL, read the file 'COPYING' for more information.
*/
#include "libnr/nr-values.h"
#include "sp-namedview.h"
Inkscape::Snapper::PointType const Inkscape::Snapper::BBOX_POINT = 0x1;
Inkscape::Snapper::PointType const Inkscape::Snapper::SNAP_POINT = 0x2;
/**
* Construct new Snapper for named view.
* \param nv Named view.
* \param d Snap distance.
*/
Inkscape::Snapper::Snapper(SPNamedView const *nv, NR::Coord const d) : _named_view(nv), _distance(d)
{
g_assert(_named_view != NULL);
g_assert(SP_IS_NAMEDVIEW(_named_view));
setSnapTo(BBOX_POINT, true);
}
/**
* Set snap distance.
* \param d New snap distance (desktop coordinates)
*/
void Inkscape::Snapper::setDistance(NR::Coord const d)
{
_distance = d;
}
/**
* \return Snap distance (desktop coordinates)
*/
NR::Coord Inkscape::Snapper::getDistance() const
{
return _distance;
}
/**
* Turn on/off snapping of specific point types.
* \param t Point type.
* \param s true to snap to this point type, otherwise false;
*/
void Inkscape::Snapper::setSnapTo(PointType t, bool s)
{
if (s) {
_snap_to |= t;
} else {
_snap_to &= ~t;
}
}
/**
* \param t Point type.
* \return true if snapper will snap this type of point, otherwise false.
*/
bool Inkscape::Snapper::getSnapTo(PointType t) const
{
return (_snap_to & t);
}
/**
* \return true if this Snapper will snap at least one kind of point.
*/
bool Inkscape::Snapper::willSnapSomething() const
{
return (_snap_to != 0);
}
/**
* 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 t Point type.
* \param p Point to snap (desktop coordinates).
* \param it Item that should not be snapped to.
* \return Snapped point.
*/
Inkscape::SnappedPoint Inkscape::Snapper::freeSnap(PointType t,
NR::Point const &p,
SPItem const *it) const
{
std::list<SPItem const *> lit;
lit.push_back(it);
return freeSnap(t, p, lit);
}
/**
* 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 t Point type.
* \param p Point to snap (desktop coordinates).
* \param it Items that should not be snapped to.
* \return Snapped point.
*/
Inkscape::SnappedPoint Inkscape::Snapper::freeSnap(PointType t,
NR::Point const &p,
std::list<SPItem const *> const &it) const
{
if (getSnapTo(t) == false) {
return SnappedPoint(p, NR_HUGE);
}
return _doFreeSnap(p, it);
}
/**
* 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.
*/
Inkscape::SnappedPoint Inkscape::Snapper::constrainedSnap(PointType t,
NR::Point const &p,
NR::Point const &c,
SPItem const *it) const
{
std::list<SPItem const *> lit;
lit.push_back(it);
return constrainedSnap(t, p, c, lit);
}
/**
* 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.
*/
Inkscape::SnappedPoint Inkscape::Snapper::constrainedSnap(PointType t,
NR::Point const &p,
NR::Point const &c,
std::list<SPItem const *> const &it) const
{
if (getSnapTo(t) == false) {
return SnappedPoint(p, NR_HUGE);
}
return _doConstrainedSnap(p, c, it);
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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