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/**
* \file guide-snapper.cpp
* \brief Snapping things to guides.
*
* Authors:
* Lauris Kaplinski <lauris@kaplinski.com>
* Frank Felfe <innerspace@iname.com>
* Carl Hetherington <inkscape@carlh.net>
*
* Copyright (C) 1999-2002 Authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "libnr/nr-values.h"
#include "libnr/nr-point-fns.h"
#include "sp-namedview.h"
#include "desktop.h"
#include "sp-guide.h"
Inkscape::GuideSnapper::GuideSnapper(SnapManager *sm, Geom::Coord const d) : LineSnapper(sm, d)
{
}
/**
* \return Snap tolerance (desktop coordinates); depends on current zoom so that it's always the same in screen pixels
*/
Geom::Coord Inkscape::GuideSnapper::getSnapperTolerance() const
{
SPDesktop const *dt = _snapmanager->getDesktop();
double const zoom = dt ? dt->current_zoom() : 1;
return _snapmanager->snapprefs.getGuideTolerance() / zoom;
}
bool Inkscape::GuideSnapper::getSnapperAlwaysSnap() const
{
return _snapmanager->snapprefs.getGuideTolerance() == 10000; //TODO: Replace this threshold of 10000 by a constant; see also tolerance-slider.cpp
}
Inkscape::GuideSnapper::LineList Inkscape::GuideSnapper::_getSnapLines(Geom::Point const &/*p*/) const
{
LineList s;
if ( NULL == _snapmanager->getNamedView() || ThisSnapperMightSnap() == false) {
return s;
}
for (GSList const *l = _snapmanager->getNamedView()->guides; l != NULL; l = l->next) {
SPGuide const *g = SP_GUIDE(l->data);
s.push_back(std::make_pair(g->normal_to_line, g->point_on_line));
}
return s;
}
/**
* \return true if this Snapper will snap at least one kind of point.
*/
bool Inkscape::GuideSnapper::ThisSnapperMightSnap() const
{
if (_snapmanager->getNamedView() == NULL) {
return false;
}
return (_snap_enabled && _snapmanager->snapprefs.getSnapToGuides() && _snapmanager->snapprefs.getSnapModeBBoxOrNodes() && _snapmanager->getNamedView()->showguides);
}
void Inkscape::GuideSnapper::_addSnappedLine(SnappedConstraints &sc, Geom::Point const snapped_point, Geom::Coord const snapped_distance, SnapSourceType const &source, SnapTargetType const &target, Geom::Point const normal_to_line, Geom::Point const point_on_line) const
{
SnappedLine dummy = SnappedLine(snapped_point, snapped_distance, source, target, getSnapperTolerance(), getSnapperAlwaysSnap(), normal_to_line, point_on_line);
sc.guide_lines.push_back(dummy);
}
/*
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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