Generates a constant color layer.
constant_shade(heightmap, color = "white", alpha = 1)Arguments
- heightmap
A two-dimensional matrix, where each entry in the matrix is the elevation at that point.
- color
Default `"white"`. Color for the constant layer.
- alpha
Default `1`, the alpha transparency.
Value
RGB array of a single color layer.
Examples
if(run_documentation()) {
#Shade a red map
montereybay %>%
constant_shade("red") %>%
add_shadow(lamb_shade(montereybay),0) |>
plot_map()
}
if(run_documentation()) {
#Shade a green map
montereybay %>%
constant_shade("green") %>%
add_shadow(lamb_shade(montereybay),0) |>
plot_map()
}
if(run_documentation()) {
#Add a blue tint
montereybay %>%
height_shade() |>
add_overlay(constant_shade(montereybay, "dodgerblue", alpha=0.25)) %>%
add_shadow(lamb_shade(montereybay,zscale=50),0) |>
plot_map()
}
if(run_documentation()) {
#Use a blank map on which to draw other data
montereybay %>%
constant_shade() %>%
add_overlay(generate_line_overlay(monterey_roads_sf, linewidth=5, color="black",
attr(montereybay,"extent"), width = 1080, height = 1080),
alphalayer=0.8) %>%
add_water(detect_water(montereybay < 0), "dodgerblue") %>%
plot_map()
}
