#import "@preview/cetz:0.1.2"

#cetz.canvas(length: 1cm, {
  import cetz.draw: *
  import cetz.angle: angle
  let (a, b, c) = ((0,0), (-1,1), (1.5,0))
  line(a, b)
  line(a, c)
  set-style(angle: (radius: 1, label-radius: .5), stroke: blue)
  angle(a, c, b, label: $alpha$, mark: (end: ">"), stroke: blue)
  set-style(stroke: red)
  angle(a, b, c, label: n => $#{n/1deg} degree$,
    mark: (end: ">"), stroke: red, inner: false)
})

#import "@preview/cetz:0.1.2": canvas, draw

#canvas(length: 1cm, {
  import draw: *
  intersections(name: "demo", {
    circle((0, 0))
    bezier((0,0), (3,0), (1,-1), (2,1))
    line((0,-1), (0,1))
    rect((1.5,-1),(2.5,1))
  })
  for-each-anchor("demo", (name) => {
    circle("demo." + name, radius: .1, fill: black)
  })
})

#import "@preview/cetz:0.1.2": canvas, draw

#canvas(length: 1cm, {
  import draw: *
  let (a, b, c) = ((0, 0), (1, 1), (2, -1))
  line(a, b, c, stroke: gray)
  bezier-through(a, b, c, name: "b")
  // Show calculated control points
  line(a, "b.ctrl-1", "b.ctrl-2", c, stroke: gray)
})

#import "@preview/cetz:0.1.2": canvas, draw

#canvas(length: 1cm, {
  import draw: *
  group(name: "g", {
    rotate(45deg)
    rect((0,0), (1,1), name: "r")
    copy-anchors("r")
  })
  circle("g.top", radius: .1, fill: black)
})

// author: LDemetrios
#import "@preview/cetz:0.2.2"

#cetz.canvas({
  let left = (a:2, b:1, d:-1, e:-2)
  let right = (p:2.7, q: 1.8, r: 0.9, s: -.3, t: -1.5, u: -2.4)
  let edges = "as,bq,dq,et".split(",")

  let ell-width = 1.5
  let ell-height = 3
  let dist = 5
  let dot-radius = 0.1
  let dot-clr = blue

  import cetz.draw: *
  circle((-dist/2, 0), radius:(ell-width ,  ell-height))
  circle((+dist/2, 0), radius:(ell-width ,  ell-height))

  for (name, y) in left {
    circle((-dist/2, y), radius:dot-radius, fill:dot-clr, name:name)
    content(name, anchor:"east", pad(right:.7em, text(fill:dot-clr, name)))
  }

  for (name, y) in right {
    circle((dist/2, y), radius:dot-radius, fill:dot-clr, name:name)
    content(name, anchor:"west", pad(left:.7em, text(fill:dot-clr, name)))
  }

  for edge in edges {
    let from = edge.at(0)
    let to = edge.at(1)
    line(from, to)
    mark(from, to, symbol: ">",  fill: black)
  }

  content((0, - ell-height), text(fill:blue)[APPLICATION], anchor:"south")
})