render_label: Render Label

In tylermorganwall/rayshader: Create Maps and Visualize Data in 2D and 3D

Render Label

Description

Adds a marker and label to the current 3D plot

Usage

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()
}

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()
}

#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()
}

tylermorganwall/rayshader documentation built on Dec. 21, 2024, 4:29 p.m.