plot_point_mesh: Plot point mesh

In diegr: Dynamic and Interactive EEG Graphics

Plot point mesh

Description

Plots a mesh of points (typically from point_mesh, but not necessary) as either a 2D ggplot or 3D rgl plot depending on mesh dimension.

Usage

plot_point_mesh(
  mesh,
  sensors = TRUE,
  label_sensors = FALSE,
  sensor_select = NULL,
  names_vec = NULL,
  col = "gray",
  cex = 0.4,
  col_sensors = "green",
  own_coordinates = NULL
)

Arguments

mesh	A data frame or tibble with cartesian coordinates of point mesh to plot. It could be D2 or D3 element of output from point_mesh function or any data frame (or tibble) with named x and y (x, y and z, respectively) columns. See Details for more information.
sensors	A logical value indicating whether the sensor locations should also be plotted (default value is TRUE).
label_sensors	A logical value indicating whether the sensor labels should also be plotted (default value is FALSE).
sensor_select	Optionally, a vector with sensor labels selected from the template during a mesh building. It must be the same as the vector used to create the mesh that the function is supposed to draw, otherwise the final plot will be incorrect.
names_vec	A character vector of labels matching rows in own_coordinates. The argument is required when using own_coordinates together with setting label_sensors = TRUE, otherwise is optional.
col	The colour of mesh points (default colour is gray).
cex	The cex (size) argument for points of the mesh.
col_sensors	The colour of sensor locations points (default colour is green).
own_coordinates	A data frame or tibble with coordinates of the sensor locations (matching the dimensionality of mesh and containing appropriate coordinate columns). If the value is NULL and sensors is set to TRUE, the HCGSN256 template is used.

Details

Please follow the instructions below when entering own_coordinates:

The output plot is designed with frontal part of the brain above and occipital part of the brain bottom. The orientation of own_coordinates should be consistent with this. In other case the results could be distorted.

For displaying 3D rgl plot, the own_coordinates must contain the x, y and z coordinates of the sensors, otherwise the function does not work correctly.

The order of elements in names_vec must be consistent with elements of own_coordinates.

When both names_vec and own_coordinates are provided, it is essential that the length of names_vec matches the number of rows in own_coordinates, otherwise the names are not plotted (despite the setting label_sensors = TRUE).

Value

A ggplot object (for 2D mesh) or plots directly to rgl 3D viewer (for 3D mesh).

See Also

point_mesh()

Examples

# 2D polygon point mesh with all sensors from the HCGSN256 template
# and default settings
# Note: for nice plot we recommend set par(mar = c(0,0,0,0))
M <- point_mesh(n = 4000, template = "HCGSN256")
plot_point_mesh(M$D2)

## Note: the example opens a rgl 3D viewer
# Plotting 3D polygon point mesh with default settings
rgl::open3d()
plot_point_mesh(M$D3)

# Plotting 2D circle point mesh with sensors from epochdata as orange points
sensors <- unique(epochdata$sensor)
M <- point_mesh(dim = 2, n = 4000, template = "HCGSN256",
sensor_select = sensors, type = "circle")
plot_point_mesh(M$D2, sensor_select = sensors, col_sensors = "orange")

# Plotting the same mesh with marking only midline electrodes
midline <- HCGSN256$D2[c(8, 15, 21, 26, 78, 86, 95, 111, 117, 127, 136, 204),]
names_vec <- HCGSN256$D2$sensor[c(8, 15, 21, 26, 78, 86, 95, 111, 117, 127, 136, 204)]
plot_point_mesh(M$D2, label_sensors = TRUE, names_vec = names_vec, own_coordinates = midline)

diegr documentation built on Nov. 5, 2025, 5:25 p.m.