Created
November 6, 2016 07:19
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Elm example: Canvas, Noise, AnimationFrame
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import Html exposing (Html) | |
import Html.App as App | |
import AnimationFrame exposing (times, diffs) | |
import Time exposing (Time) | |
import Collage exposing (..) | |
import Color exposing (Color) | |
import Element exposing (toHtml) | |
import Array | |
import Noise exposing (PermutationTable, permutationTable, noise3d) | |
import Random exposing (initialSeed) | |
main = | |
App.program | |
{ init = init | |
, view = view | |
, update = update | |
, subscriptions = subscriptions | |
} | |
-- MODEL | |
type alias Point = {x: Int, y: Int} | |
type alias Model = { | |
points: List Point, | |
time: Time, | |
simplex: PermutationTable | |
} | |
init : (Model, Cmd Msg) | |
init = | |
let | |
(perm, newSeed) = permutationTable (initialSeed 42) | |
in | |
({ | |
points = Array.toList(Array.initialize 768 (\n -> Point (n%32 - 16) (n // 32 - 16))), | |
time = 0, | |
simplex = perm | |
}, | |
Cmd.none) | |
-- UPDATE | |
type Msg | |
= Tick Time | |
update : Msg -> Model -> (Model, Cmd Msg) | |
update msg model = | |
case msg of | |
Tick newTime -> | |
({model | time = newTime}, Cmd.none) | |
-- SUBSCRIPTIONS | |
subscriptions : Model -> Sub Msg | |
subscriptions model = | |
times Tick | |
-- VIEW | |
drawCircle simplex time pt = | |
circle 10.0 | |
|> filled Color.red | |
|> alpha (noise3d simplex ((toFloat pt.x) / 15.0) ((toFloat pt.y) / 15.0) (time / 2000.0)) | |
|> move (toFloat (pt.x * 20 + 10), toFloat (pt.y * 20 + 10)) | |
view : Model -> Html Msg | |
view model = | |
toHtml (collage 640 480 (List.map (drawCircle model.simplex model.time) model.points)) |
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