R/maze.R

In ropenscilabs/miner.extra: Extra Functions to Control Minecraft with RaspberryJuice API

#' Generates a maze in front of a player
#' @param n size of the maze
#' @param player_id optional player id
#' @importFrom miner setBlocks
#' @importFrom igraph as_data_frame
#' @importFrom Rmaze makeGraph makeMaze_dfs
#' @export
mc_maze <- function(n = 5, player_id = NULL) {

    ## get player position
    pos <- getPlayerPos(player_id, tile = TRUE)
    x <- pos[1]
    y <- pos[2]
    z <- pos[3]

    ## generate a random but perfect maze
    maze <- Rmaze::makeGraph(n, n)
    maze <- Rmaze::makeMaze_dfs(maze)
    ## plotMaze(maze, n, n)

    ## let's start the binary matrix representation with blank cells
    df <- matrix(NA, nrow = n*4, ncol = n*4)

    ## add border
    df[c(1, nrow(df)), ] <- 1
    df[, c(1, nrow(df))] <- 1

    ## bottom left is the entrance, top right is exit
    df[1, ncol(df) - 1:2] <- NA
    df[nrow(df), 2:3] <- NA

    nr <- nrow(df)
    nc <- ncol(df)

    ## map graph edges into matrix cells
    requireNamespace('igraph')
    mazedf <- igraph::as_data_frame(maze)
    for (v in c('from', 'to')) {
        mazedf[, paste0(v, 'x')] <- as.numeric(sub('A_([0-9]*)_[0-9]*', '\\1', mazedf[, v]))
        mazedf[, paste0(v, 'y')] <- as.numeric(sub('A_[0-9]*_([0-9]*)', '\\1', mazedf[, v]))
    }
    mazedf[mazedf$fromx < mazedf$tox, 'direction'] <- 'top'
    mazedf[mazedf$fromy < mazedf$toy, 'direction'] <- 'right'

    ## fill in walls
    mazedf$x <- nrow(df) - mazedf$fromx * 4 + 3 - as.numeric(mazedf$direction == 'top') * 2
    mazedf$y <- mazedf$fromy * 4 - 1 + as.numeric(mazedf$direction == 'right') * 2
    for (i in seq_len(nrow(mazedf))) {
        cell <- mazedf[i, ]
        if (cell$wall == 'ON') {
            df[cell$x + -1:0, cell$y + -1:0] <- 1
        }
        if (cell$direction == 'top' & cell$wall == 'ON') {
            df[cell$x - 0:1, cell$y - 2:3] <- 2
        }
        if (cell$direction == 'right' & cell$wall == 'ON') {
            df[cell$x - 2:3, cell$y - 0:1] <- 3
        }
    }

    ## clean up some space (replace with air)
    miner::setBlocks(x, y, z, x + nr, y + 4, z + nc, 0)
    ## add diamond floor
    miner::setBlocks(x, y, z, x + nr, y, z + nc, 57)
    ## add torch
    miner::setBlocks(x + nr - 4, y + 1, z + 2, x + nr, y + 2, z + 4, 50)
    ## add glass ceiling
    miner::setBlocks(x, y + 4, z, x + nr, y + 4, z + nc, 95)
    ## add gold walls
    for (i in 1:nrow(df)) {
        for (j in 1:ncol(df)) {
            if (!is.na(df[i, j])) {
                miner::setBlocks(x + i, y + 1, z + j, x + i, y + 3, z + j, 41)
            }
        }
    }

}


#' Poll the chat window for maze generator commands and spawn mazes right in front of the player
#' @export
mc_mazer <- function() {

    chatPost('Hi, I am a maze generator bot! Just say "maze x" to generate a maze right in front of you, where x is the size of the maze (eg between 3 and 20). No need for the quotes, and please specify round integers.')

    while (TRUE) {

        ## poll for most recent chat messages
        msgs <- getChatPosts()

        ## do nothing if there are no messages since last poll
        if (nrow(msgs) > 0) {

            ## iterate through all messages
            for (msgi in seq_len(nrow(msgs))) {
                msg <- msgs[msgi, ]
                if (grepl('^maze [0-9]*$', as.character(msg[, 'message']), ignore.case = TRUE)) {
                    mc_maze(
                       as.numeric(sub('^maze ([0-9])*', '\\1', as.character(msg[, 'message']))),
                       msg[msgi, 'player'])
                }
            }
        }

        ## sleep a bit until polling chat again
        Sys.sleep(1)

    }

}