Declarative graphics for the browser
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Shine - Declarative Graphics for the Web

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Shine wraps javascript's drawing functions in a declarative API.

Heavily inspired by gloss.

demo (compiled tests) here


You need ghcjs



To represent your drawing you have to build a tree using the Picture datatype.

pic :: Picture
pic = Rect 10 20 -- represents a 10x20 square

To compose multiple Pictures you can use Over, which accepts two Pictures and overlaps them.

Picture is a monoid: <> is an alias for Over and mempty is the empty picture.

-- draw some shapes on top of each other
pic :: Picture
pic = Rect 10 20
   <> Translate 30 30 (Circle 15)
   <> Colored (Color 255 0 0 0.2) (RectF 4 4)
   <> Text "Sans 12px" LeftAlign 200 "The quick brown fox jumps over the lazy dog."

Using Foldable you can do things like

concentricCircles :: Picture
concentricCircles = foldMap Circle [1,10..100]

Drawing Pictures

Before drawing anything you need to obtain a CanvasRenderingContext2D (and sometimes a Document). For this purpose, shine provides two utility functions: fullScreenCanvas and fixedSizeCanvas


import Graphics.Shine
import Graphics.Shine.Input
import Graphics.Shine.Picture

import GHCJS.DOM (currentDocumentUnchecked)

-- This is how the ghcjs-dom hello-world does it.
-- It's boilerplate, so in the next shine version there
-- will probably be a ready-to-use run function
#if defined(ghcjs_HOST_OS)
run :: a -> a
run = id
#elif defined(MIN_VERSION_jsaddle_wkwebview)
import Language.Javascript.JSaddle.WKWebView (run)
import Language.Javascript.JSaddle.WebKitGTK (run)

main :: IO ()
main = run $ do
    doc <- currentDocumentUnchecked -- use currentDocument to handle failure
    ctx <- fixedSizeCanvas doc 400 400
    -- do something with ctx (and maybe doc)

To render a Picture on a context you have three options:


You can draw it manually using render from Graphics.Shine.Render

main :: IO ()
    {- get the context, see before -}
    draw ctx concentricCircles


You can draw a Picture that depends on time. That is, a Float -> Picture.

-- An expanding-and-contracting circle.
animation :: Float -> Picture
animation = Translate 200 200
          . Circle
          . (*100) . (+1) -- bigger positive oscillation
          . sin -- the circle's radius oscillates

main :: IO ()
main =  do
    {- get the context, see before -}
    animate ctx 30 animation


Finally, you can draw a Picture that depends on time, inputs (keyboard and mouse) and an internal state. This is especially useful for games, hence the name.

-- this code draws a black rectangle in the center of the canvas only when the
-- left mouse button is pressed
main :: IO ()
main = do
    {- get the context and the document, see before -}
    play ctx doc 30 initialState draw handleInput step
    -- our state represents the state of the left mouse button
    initialState = Up
    -- we draw a square only if the button is pressed
    draw Up = Empty
    draw Down = Translate 200 200 $ RectF 200 200
    -- when an event is fired we store the button state
    handleInput (MouseBtn BtnLeft buttonState _) = const buttonState
    handleInput _ = id -- catch-all for all other events
    step _ = id -- our state does not depend on time