padArray3 method
Implementation
List<Coordinate> padArray3(List<Coordinate> pts) {
List<Coordinate> pad =
List.filled(3, Coordinate.empty2D()); // new Coordinate[3];
for (int i = 0; i < pad.length; i++) {
if (i < pts.length) {
pad[i] = pts[i];
} else
pad[i] = pts[0];
}
return pad;
}