polygon_type create_polygon(const osmium::WayNodeList& wnl, use_nodes un = use_nodes::unique, direction dir = direction::forward) {
polygon_start();
size_t num_points = 0;
if (un == use_nodes::unique) {
osmium::Location last_location;
switch (dir) {
case direction::forward:
num_points = fill_polygon_unique(wnl.cbegin(), wnl.cend());
break;
case direction::backward:
num_points = fill_polygon_unique(wnl.crbegin(), wnl.crend());
break;
}
} else {
switch (dir) {
case direction::forward:
num_points = fill_polygon(wnl.cbegin(), wnl.cend());
break;
case direction::backward:
num_points = fill_polygon(wnl.crbegin(), wnl.crend());
break;
}
}
if (num_points < 4) {
throw osmium::geometry_error{"need at least four points for polygon"};
}
return polygon_finish(num_points);
}
linestring_type create_linestring(const osmium::WayNodeList& wnl, use_nodes un = use_nodes::unique, direction dir = direction::forward) {
linestring_start();
size_t num_points = 0;
if (un == use_nodes::unique) {
osmium::Location last_location;
switch (dir) {
case direction::forward:
num_points = fill_linestring_unique(wnl.cbegin(), wnl.cend());
break;
case direction::backward:
num_points = fill_linestring_unique(wnl.crbegin(), wnl.crend());
break;
}
} else {
switch (dir) {
case direction::forward:
num_points = fill_linestring(wnl.cbegin(), wnl.cend());
break;
case direction::backward:
num_points = fill_linestring(wnl.crbegin(), wnl.crend());
break;
}
}
if (num_points < 2) {
throw osmium::geometry_error("not enough points for linestring");
}
return linestring_finish(num_points);
}