Slic3r::anonymous_namespace{PluginHostGeometry.cpp} Namespace Reference

Functions
Polygon	parse_polygon (py::handle h, const char *who)
Polygon	as_polygon (py::handle h, const char *who)

Function Documentation

as_polygon()

Polygon Slic3r::anonymous_namespace{PluginHostGeometry.cpp}::as_polygon	(	py::handle	h,
		const char *	who )

{
    if (py::isinstance<Polygon>(h))
        return h.cast<Polygon>();
    return parse_polygon(h, who);
}

References as_polygon(), and parse_polygon().

Referenced by as_polygon().

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parse_polygon()

Polygon Slic3r::anonymous_namespace{PluginHostGeometry.cpp}::parse_polygon	(	py::handle	h,
		const char *	who )

{
    if (!py::isinstance<py::array>(h))
        throw py::value_error(std::string(who) + ": each contour/hole must be an (N,2) int64 ndarray");
    py::array a = py::reinterpret_borrow<py::array>(h);
    if (a.dtype().kind() != 'i' || a.itemsize() != (py::ssize_t) sizeof(coord_t))
        throw py::value_error(std::string(who) + ": polygon coordinates must be int64 (scaled coords)");
    if (a.ndim() != 2 || a.shape(1) != 2)
        throw py::value_error(std::string(who) + ": each polygon array must have shape (N,2)");
    if (a.shape(0) < 3)
        throw py::value_error(std::string(who) + ": a polygon needs at least 3 points");
    // dtype already validated as int64; forcecast here only guarantees a C-contiguous buffer.
    auto arr = py::array_t<coord_t, py::array::c_style | py::array::forcecast>::ensure(a);
    if (!arr)
        throw py::value_error(std::string(who) + ": could not read polygon as a contiguous int64 array");
    auto r = arr.unchecked<2>();
    Polygon poly;
    poly.points.reserve((size_t) arr.shape(0));
    for (py::ssize_t i = 0; i < arr.shape(0); ++i)
        poly.points.emplace_back((coord_t) r(i, 0), (coord_t) r(i, 1));
    return poly;
}

References parse_polygon().

Referenced by as_polygon(), and parse_polygon().

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