scale_piece: ggplot2 game diagram scales

In piecepackr: Board Game Graphics

ggplot2 game diagram scales

Description

scale_x_piece() and scale_y_piece() are wrappers around ggplot2::scale_x_continuous() and ggplot2::scale_y_continuous() with "better" defaults for board game diagrams. label_letter() labels breaks with letters and label_counting() labels breaks with positive integers to more easily generate (i.e. chess) algebraic notation coordinates. breaks_counting() generates breaks of just the positive integers within the limits.

Usage

scale_x_piece(
  ...,
  name = NULL,
  breaks = breaks_counting(),
  minor_breaks = NULL,
  labels = label_letter()
)

scale_y_piece(
  ...,
  name = NULL,
  breaks = breaks_counting(),
  minor_breaks = NULL,
  labels = label_counting()
)

label_letter()

label_counting()

breaks_counting()

Arguments

...	Passed to ggplot2::scale_x_continuous() or ggplot2::scale_y_continuous().
name	The name of the scale. Used as the axis or legend title. If waiver(), the default, the name of the scale is taken from the first mapping used for that aesthetic. If NULL, the legend title will be omitted.
breaks	One of: NULL for no breaks waiver() for the default breaks computed by the transformation object A numeric vector of positions A function that takes the limits as input and returns breaks as output (e.g., a function returned by scales::extended_breaks()). Also accepts rlang lambda function notation.
minor_breaks	One of: NULL for no minor breaks waiver() for the default breaks (one minor break between each major break) A numeric vector of positions A function that given the limits returns a vector of minor breaks. Also accepts rlang lambda function notation.
labels	One of: NULL for no labels waiver() for the default labels computed by the transformation object A character vector giving labels (must be same length as breaks) An expression vector (must be the same length as breaks). See ?plotmath for details. A function that takes the breaks as input and returns labels as output. Also accepts rlang lambda function notation.

Value

scale_x_piece() and scale_y_piece() return ggplot2 scale objects. label_letter() and label_counting() return functions suitable for use with the labels scale argument. breaks_counting() returns a function suitable for use with the breaks scale argument.

Examples

if (require("ggplot2", quietly = TRUE) && require("tibble", quietly = TRUE)) {
  envir <- game_systems("sans")
  df_board <- tibble(piece_side = "board_face", suit = 3, rank = 8,
                 x = 4.5, y = 4.5)
  df_w <- tibble(piece_side = "bit_face", suit = 6, rank = 1,
                 x = rep(1:8, 2), y = rep(1:2, each=8))
  df_b <- tibble(piece_side = "bit_face", suit = 1, rank = 1,
                 x = rep(1:8, 2), y = rep(7:8, each=8))
  df <- rbind(df_board, df_w, df_b)

  # `cfg` must be a character vector for `geom_piece()`
  ggplot(df, aes_piece(df)) +
      geom_piece(cfg = "checkers1", envir = envir) +
      coord_fixed() +
      scale_x_piece() +
      scale_y_piece() +
      theme_minimal(28) +
      theme(panel.grid = element_blank())
}

piecepackr documentation built on Sept. 22, 2023, 9:05 a.m.