Add timestamps to frames

This function adds timestamps to animation frames created with frames_spatial.

add_timestamps(frames, m, x = NULL, y = NULL, ..., verbose = TRUE)

Arguments

frames	list of ggplot2 objects, crated with frames_spatial.
m	move or moveStack used to create frames with frames_spatial of uniform time scale and time lag, e.g. prepared with align_move.
x	numeric, optioanl, position of timestamps on the x scale. By default, timestamps will be displayed in the top center.
y	numeric, optioanl, position of timestamps on the y scale.
...	optional, arguments passed to add_text, such as colour, size, type.
verbose	logical, if TRUE, messages on the function's progress are displayed (default).

Value

List of frames.

See also

frames_spatial frames_graph animate_frames

Examples

# NOT RUN {
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 timestamps as text
frames.a <- add_timestamps(frames, m, type = "text")
frames.a[[100]]

# }# NOT RUN {
# or use the ggplot2 "label" type:
frames.b <- add_timestamps(frames, m, type = "label")
frames.b[[100]]
# }# NOT RUN {
# }