shape_roundedRect: Rounded rectangle
In oganm/rdog: R port of the zdog pseudo-3D rendering engine

Add a rectangle to an illustration

shape_roundedRect(rdog = NULL, id = NULL, width = 1, height = 1,
  cornerRadius = 0.25, color = "#333", stroke = 1, fill = TRUE,
  closed = TRUE, visible = TRUE, backface = TRUE, front = c(z = 1),
  addTo = NULL, translate = c(x = 0, y = 0, z = 0), rotate = c(x = 0,
  y = 0, z = 0), scale = c(x = 1, y = 1, z = 1))

`rdog`	rdog object to add the shape to. Can be a character if called from a code block in shiny
`id`	id of the shape. If NULL, a random id will be assigned
`width, height`	Width and height of the rectangle.
`cornerRadius`	Radius of the rounded corners
`color`	Color of the shape. A color string.
`stroke`	Width of the shape line. 0 will make it invisible
`fill`	Logical. Fill the inner shape area
`closed`	Logical. Should the first point and the last be connected
`visible`	Logical. Is the shape visible.
`backface`	Logical. Should backface be visible or a color string to set a different color
`front`	Determine where the front of the shape is to decide rendering backface color. A vector with named x, y, z elements.
`addTo`	Id of the parent object. If an rdog object is piped and addTo is set to NULL, the default parent will be the illustration itself.
`translate`	Position relative to the origin. Origin point is defined based on `addTo` parameter. A vector with named x, y, z elements.
`rotate`	Set rotation. Unit is radians. Use with `pi` constant. A vector with named x, y, z elements.
`scale`	Scale dimensons. Can be an unnamed integer or a vector with named x, y ,z elements