add_text: Add static or dynamic text to frames
In moveVis: Movement Data Visualization

Description Usage Arguments Value Author(s) See Also Examples

This function adds static or dynamically changing text to the animation frames created with frames_spatial.

add_text(
  frames,
  labels,
  x,
  y,
  colour = "black",
  size = 3,
  type = "text",
  verbose = TRUE
)

`frames`	list of `ggplot2` objects, crated with `frames_spatial`.
`labels`	character, text to be added to frames. Either a single character value or a character vector of same length as `frames`.
`x`	numeric, position of text on the x scale. Either a single numeric value or a numeric vector of same length as `frames`.
`y`	numeric, position of text on the y scale. Either a single numeric value or a numeric vector of same length as `frames`.
`colour`	character, the text colour(s). Either a single character value or a character vector of same length as `frames`.
`size`	numeric, the text size(s). Either a single numeric value or a numeric vector of same length as `frames`.
`type`	character, either `"text"` to draw text or `"label"` to draw text inside a box.
`verbose`	logical, if `TRUE`, messages and progress information are displayed on the console (default).

List of frames.

Jakob Schwalb-Willmann

frames_spatial frames_graph animate_frames

library(moveVis)
library(move)

data("move_data", "basemap_data")
m <- align_move(move_data, res = 4, unit = "mins")

# create spatial frames using a custom NDVI base layer
r_list <- basemap_data[[1]]
r_times <- basemap_data[[2]]


frames <- frames_spatial(m, r_list = r_list, r_times = r_times, r_type = "gradient",
                         fade_raster = TRUE)

# add text somewhere to all frames:
frames.a <- add_text(frames, "Water area", x = 8.959, y = 47.7305,
                     colour = "white", size = 3)
frames.a[[100]]

# or use the ggplot2 "label" type:
frames.b <- add_text(frames, "Water area", x = 8.959, y = 47.7305,
                     colour = "black", size = 3, type = "label")
frames.b[[100]]