Blank.elm

-- Copy to macoutreach.rocks animation slot

myShapes model =
  [
    myFunction 5 -- replace 5 with different number for different depth
  ]
  
myFunction n = 
  if n <= 0 then
    group []
  else
    group
      [
        
      ]

FallingSquares.elm

-- Copy to macoutreach.rocks animation slot
-- loosely based on https://www.youtube.com/watch?v=SSdyo5BbRvM

myShapes model =
  [
   fallingSquares 20 -- turn up 20 for more recursion!
  ]
 
fallingSquares n =
  if n == 0 then
    group []
  else
    group
      [
        square (5 * toFloat n)
          |> outlined (solid 1) black
          |> rotate (degrees (toFloat (n - 1) * 4))
      , fallingSquares (n-1)
      ]

SierpinskiTriangle.elm

-- Copy to macoutreach.rocks animation slot

myShapes model =
  [
   scaledSierpinski 5 -- turn up 5 for more recursion! Might get laggy...
  ]
  
-- accounts for the scaling
scaledSierpinski n =
  sierpinski n 
    |> scale (2 ^ (-(toFloat n)))

sierpinski n =
  if n == 0 then
    group []
  else
    let size = 60 * (2 ^ toFloat n)
        -- determine colour based on n
        colour = if modBy 3 n == 2 then green else if modBy 3 n == 1 then lightBlue else black
    in
    group
      [
        triangle size
          |> filled colour
          |> rotate (degrees (-30))
      , sierpinski (n-1)
          |> move (0, size / 2)
      , sierpinski (n-1)
          |> move (-size / 2 * sin (degrees -60), -size / 2 * cos (degrees -60))
      , sierpinski (n-1)
          |> move ( size / 2 * sin (degrees -60), -size / 2 * cos (degrees -60))    
      ]

Snowflake.elm

myShapes model = 
           [ myBackground
           , simpleSnowflake 
           ]

simpleSnowflake = 
  let
    divide level = 
     let
      hex = ngon 6 level 
              |> filled (rgba 255 255 255 0.5)
      in
        if level > 4 then
          let 
            children = divide (level * 0.75)
                         |> move (1.4 * level,0)
            rotated angle = children |> rotate (degrees angle)
          in
            ( hex ::
              List.map rotated [0,60,120,180,240,300] )
              |> group
        else
          group []
     in
       divide 7.5

snowflake = 
  let
    oneBranch = branch 30
    rotateBranch angle = oneBranch |> rotate (degrees angle)
  in
    List.map rotateBranch [0,60,120,180,240,300]
      |> group

branch level = 
  if level > 1 then
    let 
      newLevel = level * (0.4 + 0.1 * sin level)
      outerBranch = branch newLevel
      innerBranch = branch (0.5 * newLevel)
    in
      group
        [ ngon 6 1 
            |> outlined (solid 1) (rgba 255 255 255 0.5)
            |> scaleX level
            |> move (level * 0.5, 0)
        , outerBranch
            |> rotate (degrees 60)
            |> move (0.66*level,0)
        , outerBranch
            |> rotate (degrees -60)
            |> move (0.66*level,0)
        , innerBranch
            |> rotate (degrees 60)
            |> move (0.33*level,0)
        , innerBranch
            |> rotate (degrees -60)
            |> move (0.33*level,0)
        ]
  else 
    group []
  
myBackground = square 200 |> filled (rgb 50 50 255)

Spinner.elm

-- Copy to macoutreach.rocks animation slot

myShapes model =
  [
    spinner model.time 6 -- turn up 6 for more recursion! Might get laggy...
  ]

spinner time n = 
  if n < 3 then
    group []
  else
    let
      shadeOfRed = rgb (255-255/(toFloat n)) 0 0
      
      rainbow =
        case n + 3 of
          10 -> red
          9 -> orange
          8 -> yellow
          7 -> green
          6 -> lightBlue
          5 -> blue
          4 -> purple
          3 -> pink
          otherwise -> black
              
      colour = shadeOfRed
    in
    group 
      [
        ngon n 10
          |> filled colour
          |> move (30, 30)
      , ngon n 10
          |> filled colour
          |> move (-30,30)
      , ngon n 10
          |> filled colour
          |> move (30, -30)
      , ngon n 10
          |> filled colour
          |> move (-30, -30)
      , spinner time (n-1)
          |> move (30, 30)
      , spinner time (n-1)
          |> move (-30, 30)
      , spinner time (n-1)
          |> move (30, -30)
      , spinner time (n-1)
          |> move (-30, -30)
      ] |> scale (toFloat n/6)
        |> rotate (degrees (50*time))

Tree.elm

-- Copy to macoutreach.rocks animation slot

myShapes model =
  let animateTree = modBy 13 (round (model.time*3))
  in
  [
    tree 11 -- replace 11 with different number for different depth or with animateTree to get animation
     |> move (0,-95)
     |> scale 0.6
  ]
  
tree n = 
  if n == 0 then
    group []
  else
    let
      angle = 20
      weirdRainbow = hsl (degrees 44) 0.6 (0.32 + toFloat n)
      colour = darkBrown
    in
    group
      [
        rect 3 40
          |> filled colour
          |> move(0,20)
          |> rotate (degrees angle)
      , rect 3 40
          |> filled colour
          |> move(0,20)
          |> rotate (degrees -angle)
      , tree (n-1)
          |> rotate (degrees -angle)
          |> move (40*sin(degrees angle), 40*cos(degrees angle))
      , tree (n-1)
          |> rotate (degrees angle)
          |> move (-40*sin(degrees angle), 40*cos(degrees angle))
      ] |> scale (1 - 1/(toFloat n + 1))

Rotating falling squares

-- Your shapes go here!
-- You can use model.time to animate things :)
myShapes model =
  [
    myFunction model 10
  ]

myFunction model n =
  if n <= 0 then
    group []
  else
    group
      [
        square (10 * toFloat n)
          |> outlined (solid 2) black
          |> rotate (degrees (20 * toFloat n))
          |> rotate (degrees (toFloat n * 10 * model.time))
      , myFunction model (n - 1)
      ]

Rainbow circle spiral

-- Your shapes go here!
-- You can use model.time to animate things :)
myShapes model =
  [
    myFunction 200
  ]

myFunction n = 
  let 
    col = hsl (degrees <| toFloat n) 1 0.8
  in
    if n == 0 then
      group []
    else
    group
      [
        circle (toFloat n)
          |> outlined (solid 0.5) col
          |> move (0, toFloat n)
          |> rotate (degrees (2 * toFloat n))
      , myFunction (n-1)
      ]