Add psychrometric grid lines — geom_grid

These helpers provide ggplot-style controls for psychrometric reference grids. They do not add data layers; they mark a grid as visible and let coord_psychro() render it in the panel background.

Usage

geom_grid_relhum(
  ...,
  show = TRUE,
  label = TRUE,
  label_loc = 0.95,
  label_parse = FALSE
)

geom_grid_wetbulb(
  ...,
  show = TRUE,
  label = TRUE,
  label_loc = 0.1,
  label_parse = TRUE
)

geom_grid_vappres(
  ...,
  show = TRUE,
  label = TRUE,
  label_loc = 0.5,
  label_parse = FALSE
)

geom_grid_specvol(
  ...,
  show = TRUE,
  label = TRUE,
  label_loc = 0.95,
  label_parse = TRUE
)

geom_grid_enthalpy(
  ...,
  show = TRUE,
  label = TRUE,
  label_loc = 0.95,
  label_parse = TRUE
)

Arguments

...: Line style settings passed to ggplot2::element_line(), such as colour, color, linewidth, size, and linetype. Label style settings can be supplied with label.* names to keep them separate from line style settings, such as label.colour, label.color, label.size, label.alpha, label.family, label.fontface, label.lineheight, and label.vjust.
show: A single logical value. If FALSE, hide the corresponding grid.
label: A single logical value. If FALSE, hide labels for the corresponding major grid lines.
label_loc: A single number in range [0, 1] indicating the label position along each grid line. NA hides labels.
label_parse: If TRUE, labels are parsed as plotmath expressions.

Examples

ggpsychro(tdb_lim = c(0, 50), hum_lim = c(0, 30)) +
    geom_grid_relhum() +
    geom_grid_wetbulb() +
    geom_grid_enthalpy()


ggpsychro(tdb_lim = c(0, 50), hum_lim = c(0, 30)) +
    geom_grid_relhum(color = "black", linewidth = 0.6, label.size = 4) +
    scale_relhum_continuous(
        breaks = seq(25, 75, by = 25),
        minor_breaks = NULL
    ) +
    geom_grid_wetbulb(color = "black", label = FALSE) +
    scale_wetbulb_continuous(
        breaks = seq(10, 30, by = 10),
        minor_breaks = NULL
    ) +
    geom_grid_vappres(show = FALSE) +
    geom_grid_specvol(label_loc = 0.90) +
    geom_grid_enthalpy(label.size = 4)