register-mark

register-mark(
symbol: str,mnemonic: nonestr,body: function,tip: nonenumbercoordinate,base: nonenumbercoordinate,center: nonenumbercoordinate,reverse-tip: nonenumbercoordinate,reverse-base: nonenumbercoordinate,reverse-center: nonenumbercoordinate,
) 

Register a custom mark to the canvas

The mark should contain both anchors called tip and base that are used to determine the marks orientation. If unset both default to (0, 0). An anchor named center is used as center of the mark, if present. Otherwise the mid between tip and base is used.

register-mark(":)", style => {
  circle((0,0), radius: .5, fill: yellow)
  arc((0,0), start: 180deg + 30deg, delta: 180deg - 60deg, anchor: "origin", radius: .3)
  circle((-0.15, 0.15), radius: .1, fill: white)
  circle((-0.10, 0.10), radius: .025, fill: black)
  circle(( 0.15, 0.15), radius: .1, fill: white)
  circle(( 0.20, 0.10), radius: .025, fill: black)

  anchor("tip",  ( 0.5, 0))
  anchor("base", (-0.5, 0))
})

line((0,0), (3,0), mark: (end: ":)"))

symbol:

str

Mark name

mnemonic:

none or str

Mark short name

body:

function

Mark drawing callback, receiving the mark style as argument and returning elements. Format (styles) => elements.

tip:

none or number or coordinate

Tip coordinate (if passed a number, the y component is 0)

base:

none or number or coordinate

Base coordinate (see tip)

center:

none or number or coordinate

Center coordinate (see tip)

reverse-tip:

none or number or coordinate

Reversed tip coordinate (see tip)

reverse-base:

none or number or coordinate

Reversed base coordinate (see tip)

reverse-center:

none or number or coordinate

Reversed center coordinate (see tip)