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Register a Custom Shape

Source: R/aaa-globals.R
register_shape.Rd

Register a new shape that can be used for node rendering.

Usage

register_shape(name, draw_fn)

Arguments

name

Character. Name of the shape.

draw_fn

Function. A function that draws the shape. Should accept parameters: x, y, size, fill, border_color, border_width, ...

Value

Invisible NULL.

Examples

# Register a custom hexagon shape under a new name. Registering an existing
# name (for example "hexagon") would replace the built-in shape for the rest
# of the session, so pick a name of your own.
register_shape("my_hexagon", function(x, y, size, fill, border_color, border_width, ...) {
  angles <- seq(0, 2 * pi, length.out = 7)
  grid::polygonGrob(
    x = x + size * cos(angles),
    y = y + size * sin(angles),
    gp = grid::gpar(fill = fill, col = border_color, lwd = border_width)
  )
})