Commands
bower i
pulp build --to app.js
Versions
- Pulp version 12.3.0
- purs version 0.12.0
-
-
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simple purescript-signal + purescript-canvas example
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| { | |
| "name": "ps", | |
| "ignore": [ | |
| "**/.*", | |
| "node_modules", | |
| "bower_components", | |
| "output" | |
| ], | |
| "dependencies": { | |
| "purescript-prelude": "^4.1.0", | |
| "purescript-console": "^4.1.0", | |
| "purescript-effect": "^2.0.0", | |
| "purescript-canvas": "^4.0.0", | |
| "purescript-signal": "^10.1.0" | |
| }, | |
| "devDependencies": { | |
| "purescript-psci-support": "^4.0.0" | |
| } | |
| } |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <title>Document</title> | |
| </head> | |
| <body> | |
| <canvas id="scene" width="800" height="800"></canvas> | |
| <script src="app.js"></script> | |
| </body> | |
| </html> |
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| module Main where | |
| import Prelude | |
| import Effect (Effect) | |
| import Data.Maybe (Maybe(Just, Nothing)) | |
| import Graphics.Canvas as C | |
| import Signal (foldp, runSignal) | |
| import Signal.DOM (animationFrame) | |
| main :: Effect Unit | |
| main = do | |
| mcanvas <- C.getCanvasElementById "scene" | |
| case mcanvas of | |
| Just canvas -> do | |
| context <- C.getContext2D canvas | |
| frames <- animationFrame | |
| let game = foldp (const update) initialState frames | |
| runSignal (render context <$> game) | |
| Nothing -> do | |
| pure unit | |
| type State = | |
| { x :: Number | |
| , step :: Number | |
| } | |
| initialState :: State | |
| initialState = | |
| { x: 0.0 | |
| , step: 10.0 | |
| } | |
| scene :: | |
| { x :: Number | |
| , y :: Number | |
| , width :: Number | |
| , height :: Number | |
| , boxSize :: Number | |
| } | |
| scene = | |
| { x: 0.0 | |
| , y: 0.0 | |
| , width: 800.0 | |
| , height: 800.0 | |
| , boxSize: 25.0 | |
| } | |
| update :: State -> State | |
| update state = | |
| if state.x + scene.boxSize > scene.width then | |
| { x: scene.width - scene.boxSize | |
| , step: -state.step | |
| } | |
| else if state.x < scene.x then | |
| { x: scene.x | |
| , step: -state.step | |
| } | |
| else | |
| { x: state.x + state.step | |
| , step: state.step | |
| } | |
| render :: C.Context2D -> State -> Effect Unit | |
| render context state = do | |
| clearCanvas context | |
| drawRect context state | |
| pure unit | |
| clearCanvas :: C.Context2D -> Effect Unit | |
| clearCanvas ctx = do | |
| C.setFillStyle ctx "#000000" | |
| C.fillRect ctx { x: 0.0, y: 0.0, width: scene.width, height: scene.height } | |
| pure unit | |
| drawRect :: C.Context2D -> State -> Effect Unit | |
| drawRect ctx state = do | |
| C.setFillStyle ctx "#0088DD" | |
| C.fillRect ctx | |
| { x: state.x | |
| , y: scene.height / 2.0 | |
| , width: scene.boxSize | |
| , height: scene.boxSize | |
| } | |
| pure unit |
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Forked and some fixed to adapt PureScript version 0.12.0.
Forked form: https://gist.github.com/soupi/76103c45fc00a6c1478e
Captured GIF (Actual appearance is more smooth)
