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Bounding Box - new method align_to_grid

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bubnikv 2016-11-29 19:25:10 +01:00
parent bde2ee6a7e
commit 792856a505
2 changed files with 25 additions and 0 deletions
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22
xs/src/libslic3r/BoundingBox.cpp
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@ -277,4 +277,26 @@ BoundingBoxBase<PointClass>::overlap(const BoundingBoxBase<PointClass> &other) c
template bool BoundingBoxBase<Point>::overlap(const BoundingBoxBase<Point> &point) const;
template bool BoundingBoxBase<Pointf>::overlap(const BoundingBoxBase<Pointf> &point) const;
// Align a coordinate to a grid. The coordinate may be negative,
// the aligned value will never be bigger than the original one.
static inline coord_t _align_to_grid(const coord_t coord, const coord_t spacing) {
// Current C++ standard defines the result of integer division to be rounded to zero,
// for both positive and negative numbers. Here we want to round down for negative
// numbers as well.
coord_t aligned = (coord < 0) ?
((coord - spacing + 1) / spacing) * spacing :
(coord / spacing) * spacing;
assert(aligned <= coord);
return aligned;
}
void BoundingBox::align_to_grid(const coord_t cell_size)
{
if (this->defined) {
min.x = _align_to_grid(min.x, cell_size);
min.y = _align_to_grid(min.y, cell_size);
}
}
}