This set of functions makes it easy to define shapes at the terminal points of edges that are used to shorten the edges. The shapes themselves are not drawn, but the edges will end at the boundary of the shape rather than at the node position. This is especially relevant when drawing arrows at the edges as the arrows will be partly obscured by the node unless the edge is shortened. Edge shortening is dynamic and will update as the plot is resized, making sure that the capping remains at an absolute distance to the end point.
geometry( type = "circle", width = 1, height = width, width_unit = "cm", height_unit = width_unit ) circle(radius = 1, unit = "cm") square(length = 1, unit = "cm") ellipsis(a = 1, b = 1, a_unit = "cm", b_unit = a_unit) rectangle(width = 1, height = 1, width_unit = "cm", height_unit = width_unit) label_rect(label, padding = margin(1, 1, 1.5, 1, "mm"), ...) is.geometry(x)
The type of geometry to use. Currently
|width, height, length, radius, a, b||
The dimensions of the shape.
|unit, width_unit, height_unit, a_unit, b_unit||
The unit for the numbers given.
The text to be enclosed
extra size to be added around the text using the
Passed on to
An object to test for geometry inheritance
A geometry object encoding the specified shape.
geometry is the base constructor, while the rest are helpers to save
circle creates circles width a given radius,
creates squares at a given side length,
ellipsis creates ellipses with
given a and b values (width and height radii), and
rectangles of a given width and height. label_rect is a helper that, given
a list of strings and potentially formatting options creates a rectangle that
encloses the string.
geometry(c('circle', 'rect', 'rect'), 1:3, 3:1)#>  "circle(1cm, 3cm)" "rect(2cm, 2cm)" "rect(3cm, 1cm)"circle(1:4, 'mm')#>  "circle(2mm, 2mm)" "circle(4mm, 4mm)" "circle(6mm, 6mm)" "circle(8mm, 8mm)"label_rect(c('some', 'different', 'words'), fontsize = 18)#>  "rect(1.75332465277778cm, 0.708611111111111cm)" #>  "rect(2.48423611111111cm, 0.708611111111111cm)" #>  "rect(1.89443576388889cm, 0.708611111111111cm)"