#include "sp-namedview.h"

#include "display/canvas-grid.h"

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;

SPCGrid *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 SPCGrid in _named_view->gridviews will be used.

griditem = SP_CGRID(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 const scale = griditem->scaled[i] ? griditem->empspacing : 1;

NR::Coord const rounded = round_to_nearest_multiple_plus(p[i],

_named_view->gridspacing[i] * scale,

_named_view->gridorigin[i]);

s.push_back(std::make_pair(NR::Dim2(i), rounded));

}

return s;

}