// addWall on both sides
func (m *Maze) addWall(c common.Coordinate, dir int) {
nb := c.Neighbor(dir)
if m.contains(nb) {
r, _ := m.GetRoom(c.X, c.Y)
r.AddWall(dir)
r, _ = m.GetRoom(nb.X, nb.Y)
r.AddWall(common.ReverseDirection[dir])
}
}
// pickNeighbor selects a neighboring unexplored coordinate
func pickNeighbor(coordinate common.Coordinate, explored map[common.Coordinate]Survey) (common.Coordinate, int, bool) {
survey := explored[coordinate]
idxs := rand.Perm(len(allDirections))
for _, idx := range idxs {
dir := allDirections[idx]
if !survey.HasWall(dir) {
neighbor := coordinate.Neighbor(dir)
if _, ok := explored[neighbor]; !ok {
return neighbor, dir, true
}
}
}
return coordinate, 0, false
}