draw.segments.on.image: Draw contour segments onto a magick image.

In fsbrain: Managing and Visualizing Brain Surface Data

Draw contour segments onto a magick image.

Description

Draws a set of line segments (as returned by mesh.slice.intersection) onto a magick image. Individual mesh triangles produce small segments, which collectively trace the contour boundary when drawn together.

Usage

draw.segments.on.image(
  img,
  segments,
  slice_axis,
  row_axis,
  col_axis,
  color = "#FF0000",
  lwd = 1
)

Arguments

img	a magick image instance (a single 2D slice image).
segments	list of 2×2 matrices, each a line segment in 0-based CRS coordinates on the two orthogonal axes.
slice_axis	integer, the axis (1,2,3) perpendicular to the slice plane.
row_axis	integer, which CRS axis (1, 2, or 3) maps to the image row dimension.
col_axis	integer, which CRS axis (1, 2, or 3) maps to the image column dimension.
color	character string, the color for the contour lines.
lwd	numeric, line width passed to segments. Defaults to 1.

Value

the modified magick image (invisibly).

fsbrain documentation built on Aug. 23, 2026, 5:06 p.m.