Adds a marker and label to the current 3D plot
render_label(
heightmap,
text,
lat,
long,
altitude = NULL,
extent = NULL,
x = NULL,
y = NULL,
z = NULL,
zscale = 1,
relativez = TRUE,
offset = 0,
clear_previous = FALSE,
textsize = 1,
dashed = FALSE,
dashlength = "auto",
linewidth = 3,
antialias = FALSE,
alpha = 1,
textalpha = 1,
freetype = TRUE,
adjustvec = NULL,
family = "sans",
fonttype = "standard",
linecolor = "black",
textcolor = "black"
)Arguments
- heightmap
A two-dimensional matrix, where each entry in the matrix is the elevation at that point. All points are assumed to be evenly spaced.
- text
The label text.
- lat
A latitude for the text. Must provide an `raster::extent` object to argument `extent` for the map.
- long
A latitude for the text. Must provide an `raster::extent` object to argument `extent` for the map.
- altitude
Default `NULL`. Elevation of the label, in units of the elevation matrix (scaled by zscale). If none is passed, this will default to 10 percent above the maximum altitude in the heightmap.
- extent
Either an object representing the spatial extent of the scene (either from the `raster`, `terra`, `sf`, or `sp` packages), a length-4 numeric vector specifying `c("xmin", "xmax","ymin","ymax")`, or the spatial object (from the previously aforementioned packages) which will be automatically converted to an extent object.
- x
Default `NULL`. Directly specify the `x` index in the matrix to place the label.
- y
Default `NULL`. Directly specify the `y` index in the matrix to place the label.
- z
Default `NULL`. Elevation of the label, in units of the elevation matrix (scaled by zscale).
- zscale
Default `1`. The ratio between the x and y spacing (which are assumed to be equal) and the z axis. For example, if the elevation levels are in units
- relativez
Default `TRUE`. Whether `z` should be measured in relation to the underlying elevation at that point in the heightmap, or set absolutely (`FALSE`).
- offset
Elevation above the surface (at the label point) to start drawing the line.
- clear_previous
Default `FALSE`. If `TRUE`, it will clear all existing text and lines rendered with `render_label()`. If no other arguments are passed to `render_label()`, this will just remove all existing lines.
- textsize
Default `1`. A numeric character expansion value.
- dashed
Default `FALSE`. If `TRUE`, the label line is dashed.
- dashlength
Default `auto`. Length, in units of the elevation matrix (scaled by `zscale`) of the dashes if `dashed = TRUE`.
- linewidth
Default `3`. The line width.
- antialias
Default `FALSE`. If `TRUE`, the line with be have anti-aliasing applied. NOTE: anti-aliasing can cause some unpredictable behavior with transparent surfaces.
- alpha
Default `1`. Transparency of the label line.
- textalpha
Default `1`. Transparency of the label text.
- freetype
Default `TRUE`. Set to `FALSE` if freetype is not installed (freetype enables anti-aliased fonts). NOTE: There are occasionally transparency issues when positioning Freetype fonts in front and behind a transparent surface.
- adjustvec
Default `c(0.5,-0.5)`. The horizontal and vertical offset for the text. If `freetype = FALSE` and on macOS/Linux, this is adjusted to `c(0.33,-0.5)` to keep the type centered.
- family
Default `"sans"`. Font family. Choices are `c("serif", "sans", "mono", "symbol")`.
- fonttype
Default `"standard"`. The font type. Choices are `c("standard", "bold", "italic", "bolditalic")`. NOTE: These require FreeType fonts, which may not be installed on your system. See the documentation for rgl::text3d() for more information.
- linecolor
Default `black`. Color of the line.
- textcolor
Default `black`. Color of the text.
Examples
if(run_documentation()) {
montereybay %>%
sphere_shade() %>%
plot_3d(montereybay,zscale=50,water=TRUE, watercolor="#233aa1")
render_snapshot()
}
santa_cruz = c(36.962957, -122.021033)
#We want to add a label to Santa Cruz, so we use the x and y matrix coordinate (x=220 and y=330)
if(run_documentation()) {
render_label(montereybay,lat = santa_cruz[1], long = santa_cruz[2],
extent = attr(montereybay, "extent"),
altitude=12000, zscale=50, text = "Santa Cruz")
render_snapshot()
}
monterey = c(36.603053, -121.892933)
#We can also change the linetype to dashed by setting `dashed = TRUE` (additional options allow
#the user to control the dash length). You can clear the existing lines by setting
#`clear_previous = TRUE`.
if(run_documentation()) {
render_label(montereybay, lat = monterey[1], long = monterey[2], altitude = 10000,
extent = attr(montereybay, "extent"),
zscale = 50, text = "Monterey", textcolor = "white", linecolor="darkred",
dashed = TRUE, clear_previous = TRUE)
render_snapshot()
}
#> Error in validate_mesh(scene): !any(is.na(normals)) is not TRUE
canyon = c(36.621049, -122.333912)
#By default, z specifies the altitude above that point on the elevation matrix. We can also specify
#an absolute height by setting `relativez=FALSE`.
if(run_documentation()) {
render_label(montereybay,lat=canyon[1], long = canyon[2], altitude = 2000,
extent = attr(montereybay,"extent"),
zscale=50,text = "Monterey Canyon", relativez=FALSE)
render_snapshot()
}
#> Error in validate_mesh(scene): !any(is.na(normals)) is not TRUE
#We can also render labels in high quality with `render_highquality()`, specifying a custom
#line radius. By default, the labels point towards the camera, but you can fix their angle with
#argument `text_angle`.
if(run_documentation()) {
render_camera(theta=35, phi = 35, zoom = 0.80, fov=60)
render_label(montereybay, lat = monterey[1], long = monterey[2], altitude = 10000,
extent = attr(montereybay, "extent"),
zscale = 50, text = "Monterey", textcolor = "white", linecolor="darkred",
dashed = TRUE, clear_previous = TRUE)
render_label(montereybay,lat=canyon[1], long = canyon[2], altitude = 2000, zscale=50,
extent = attr(montereybay,"extent"), textcolor = "white", linecolor="white",
text = "Monterey Canyon", relativez=FALSE)
render_highquality(samples = 128,text_size = 24, line_radius = 2, text_offset = c(0, 20, 0),
lightdirection = 180, clamp_value = 10, min_variance = 0,
sample_method = "sobol_blue")
}
if(run_documentation()) {
#Fixed text angle
render_highquality(samples = 128,text_size = 24, line_radius = 2, text_offset = c(0, 20, 0),
lightdirection = 180, text_angle = 0, clamp_value=10, min_variance = 0,
sample_method = "sobol_blue")
}
#We can remove all existing labels by calling `render_label(clear_previous = TRUE)`
if(run_documentation()) {
render_label(clear_previous = TRUE)
render_snapshot()
}
