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/**
* \file grid-snapper.cpp
* \brief Snapping things to grids.
*
* Authors:
* Lauris Kaplinski <lauris@kaplinski.com>
* Frank Felfe <innerspace@iname.com>
* Carl Hetherington <inkscape@carlh.net>
*
* Copyright (C) 2006 Johan Engelen <johan@shouraizou.nl>
* Copyright (C) 1999-2002 Authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "sp-namedview.h"
#include "inkscape.h"
#include "desktop.h"
#include "display/canvas-grid.h"
#include "display/canvas-axonomgrid.h"
/**
* \return x rounded to the nearest multiple of c1 plus c0.
*
* \note
* If c1==0 (and c0 is finite), then returns +/-inf. This makes grid spacing of zero
* mean "ignore the grid in this dimention". We're currently discussing "good" semantics
* for guide/grid snapping.
*/
/* FIXME: move this somewhere else, perhaps */
static double round_to_nearest_multiple_plus(double x, double const c1, double const c0)
{
return floor((x - c0) / c1 + .5) * c1 + c0;
}
Inkscape::GridSnapper::GridSnapper(SPNamedView const *nv, NR::Coord const d) : LineSnapper(nv, d)
{
}
Inkscape::LineSnapper::LineList
Inkscape::GridSnapper::_getSnapLines(NR::Point const &p) const
{
LineList s;
if ( NULL == _named_view ) {
return s;
}
CXYGrid *griditem = NULL;
for (GSList *l = _named_view->gridviews; l != NULL; l = l->next) {
// FIXME : this is a hack since there is only one view for now
// but when we'll handle multiple views, snapping should
// must be rethought and maybe only the current view
// should give back it's SHOWN lines to snap to
// For now, the last CXYGrid in _named_view->gridviews will be used.
if ( INKSCAPE_IS_CXYGRID(GTK_OBJECT(l->data)) ) {
griditem = INKSCAPE_CXYGRID(l->data);
}
}
g_assert(griditem != NULL);
for (unsigned int i = 0; i < 2; ++i) {
/* This is to make sure we snap to only visible grid lines */
double scaled_spacing = griditem->sw[i]; // this is spacing of visible lines if screen pixels
// convert screen pixels to px
// FIXME: after we switch to snapping dist in screen pixels, this will be unnecessary
if (SP_ACTIVE_DESKTOP) {
scaled_spacing /= SP_ACTIVE_DESKTOP->current_zoom();
}
NR::Coord const rounded = round_to_nearest_multiple_plus(p[i],
scaled_spacing,
_named_view->gridorigin[i]);
s.push_back(std::make_pair(NR::Dim2(i), rounded));
}
return s;
}
/*
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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