void shape_io::read_polyline( shape_file::record_type & record, mapnik::geometry_container & geom) { int num_parts = record.read_ndr_integer(); int num_points = record.read_ndr_integer(); if (num_parts == 1) { std::auto_ptr<geometry_type> line(new geometry_type(mapnik::LineString)); record.skip(4); double x = record.read_double(); double y = record.read_double(); line->move_to(x, y); for (int i = 1; i < num_points; ++i) { x = record.read_double(); y = record.read_double(); line->line_to(x, y); } geom.push_back(line); } else { std::vector<int> parts(num_parts); for (int i = 0; i < num_parts; ++i) { parts[i] = record.read_ndr_integer(); } int start, end; for (int k = 0; k < num_parts; ++k) { std::auto_ptr<geometry_type> line(new geometry_type(mapnik::LineString)); start = parts[k]; if (k == num_parts - 1) { end = num_points; } else { end = parts[k + 1]; } double x = record.read_double(); double y = record.read_double(); line->move_to(x, y); for (int j = start + 1; j < end; ++j) { x = record.read_double(); y = record.read_double(); line->line_to(x, y); } geom.push_back(line); } } }
mapnik::geometry::geometry<double> shape_io::read_polyline(shape_file::record_type & record) { mapnik::geometry::geometry<double> geom; // default empty int num_parts = record.read_ndr_integer(); int num_points = record.read_ndr_integer(); if (num_parts == 1) { mapnik::geometry::line_string<double> line; line.reserve(num_points); record.skip(4); for (int i = 0; i < num_points; ++i) { double x = record.read_double(); double y = record.read_double(); line.add_coord(x, y); } geom = std::move(line); } else { std::vector<int> parts; parts.resize(num_parts); std::for_each(parts.begin(), parts.end(), [&](int & part) { part = record.read_ndr_integer();}); int start, end; mapnik::geometry::multi_line_string<double> multi_line; multi_line.reserve(num_parts); for (int k = 0; k < num_parts; ++k) { start = parts[k]; if (k == num_parts - 1) { end = num_points; } else { end = parts[k + 1]; } mapnik::geometry::line_string<double> line; line.reserve(end - start); for (int j = start; j < end; ++j) { double x = record.read_double(); double y = record.read_double(); line.add_coord(x, y); } multi_line.push_back(std::move(line)); } geom = std::move(multi_line); } return geom; }