Add a "contour" layer to a Bokeh figure

Computes and draws contour lines.

ly_contour(
  fig,
  z,
  x = seq(0, 1, length.out = nrow(z)),
  y = seq(0, 1, length.out = ncol(z)),
  nlevels = 10,
  levels = pretty(range(z, na.rm = TRUE), nlevels),
  color = "black",
  alpha = 1,
  width = 1,
  type = 1,
  lname = NULL,
  lgroup = NULL,
  ...
)

Arguments

fig	figure to modify
z	a matrix containing the values to compute contour lines for
x, y	locations of grid lines at which the values in image are measured (see contourLines)
nlevels, levels	parameters sent to contourLines)
color	color to use to stroke lines with - a hex code (with no alpha) or any of the 147 named CSS colors, e.g 'green', 'indigo'
alpha	transparency value for the line between 0 (transparent) and 1 (opaque)
width	stroke width in units of pixels
type	an integer between 1 and 6 matching the lty property in par or an array of integer pixel distances that describe the on-off pattern of dashing to use
lname	layer name
lgroup	layer group
...	additional parameters for fine control over line properties (see "Additional parameters" below)

Additional parameters

line_join	how path segments should be joined together 'miter' 'round' 'bevel'
line_cap	how path segments should be terminated 'butt' 'round' 'square'
line_dash	an integer between 1 and 6 matching the lty property in par or an array of integer pixel distances that describe the on-off pattern of dashing to use
line_dash_offset	the distance in pixels into the line_dash that the pattern should start from

See also

Other layer functions: ly_abline(), ly_annular_wedge(), ly_annulus(), ly_arc(), ly_bar(), ly_bezier(), ly_boxplot(), ly_crect(), ly_curve(), ly_density(), ly_hist(), ly_image_url(), ly_image(), ly_lines(), ly_map(), ly_multi_line(), ly_oval(), ly_patch(), ly_points(), ly_polygons(), ly_quadratic(), ly_quantile(), ly_ray(), ly_rect(), ly_segments(), ly_text(), ly_wedge()

Examples

# \donttest{
p <- figure(xlim = c(0, 1), ylim = c(0, 1), title = "Volcano") %>%
  ly_image(volcano) %>%
  ly_contour(volcano)
p
# }