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GNU GENERAL PUBLIC LICENSE
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
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state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) 2021 Matei Adriel
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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This program is distributed in the hope that it will be useful,
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<program> Copyright (C) 2021 Matei Adriel
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
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The hypothetical commands `show w' and `show c' should show the appropriate
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The GNU General Public License does not permit incorporating your program
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may consider it more useful to permit linking proprietary applications with
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/bower_components/
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/.pulp-cache/
/output/
/generated-docs/
/.psc-package/
/.psc*
/.purs*
/.psa*
/.spago
dist

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purescript/purebird/build.js Normal file
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const esbuild = require("esbuild");
const PurescriptPlugin = require("esbuild-plugin-purescript");
const alias = require("esbuild-plugin-alias");
const { sassPlugin } = require("esbuild-sass-plugin");
const production = process.env.NODE_ENV === "production";
// const preactCompat = require.resolve("preact/compat");
esbuild
.build({
entryPoints: ["src/index.ts"],
bundle: true,
minify: production,
outdir: "dist",
watch: true,
plugins: [
PurescriptPlugin(),
sassPlugin(),
alias({
//react: preactCompat,
//"react-dom": preactCompat,
}),
],
sourcemap: "both",
jsxFactory: "h",
jsxFragment: "Fragment",
// inject: ["./src/preact-shim.ts"],
loader: {
".svg": "file",
".png": "file",
},
})
.catch((_e) => process.exit(1));

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{
"name": "purebird",
"scripts": {
"dev": "rm -rf dist && mkdir dist && cp public/* dist -r && node ./build & live-server dist"
},
"devDependencies": {
"@types/node": "^16.4.3",
"esbuild": "^0.12.9",
"esbuild-plugin-alias": "^0.1.2",
"esbuild-plugin-purescript": "^1.0.2",
"esbuild-sass-plugin": "^1.4.7",
"live-server": "^1.2.1",
"sass": "^1.35.1",
"typescript": "^4.3.5"
},
"dependencies": {
"@thi.ng/matrices": "^0.6.59",
"@thi.ng/vectors": "^6.0.1"
}
}

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purescript/purebird/packages.dhall Normal file
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let upstream =
https://github.com/purescript/package-sets/releases/download/psc-0.14.3-20210825/packages.dhall
sha256:eee0765aa98e0da8fc414768870ad588e7cada060f9f7c23c37385c169f74d9f
in upstream

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Purebird</title>
<script defer src="./index.js"></script>
<link rel="stylesheet" href="index.css">
</head>
<body>
<div id="app">
<canvas id="canvas" width=1000 height=700></canvas>
</div>
</body>
</html>

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purescript/purebird/spago.dhall Normal file
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{ name = "purebird"
, dependencies =
[ "arrays"
, "canvas"
, "console"
, "effect"
, "prelude"
, "psci-support"
, "random"
]
, packages = ./packages.dhall
, sources = [ "src/**/*.purs", "test/**/*.purs" ]
}

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purescript/purebird/src/Game.purs Normal file
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module Game where
import Prelude
import Data.Array (filter)
import Data.Array as Array
import Data.Foldable (for_)
import Data.Maybe (Maybe(..))
import Data.Tuple (fst, snd)
import Data.Tuple.Nested (type (/\))
import Effect (Effect)
import Effect.Random (randomRange)
import Graphics.Canvas (Context2D, arc, clearRect, fillPath, fillRect, setFillStyle)
import Math (tau)
type Pole =
{ width :: Number
, gapY :: Number
, gapHeight :: Number
, x :: Number
}
type GameState =
{ birdY :: Number
, birdVelocity :: Number
, poleVelocity :: Number
, birdRadius :: Number
, poles :: Array Pole
, generationSettings :: GenerationSettings
, gravity :: Number
, player :: Player
, jumpForce :: Number
}
type GenerationSettings
=
{ minYGap :: Number
, minXGap :: Number
, screen :: Number /\ Number
, minPoleHeight :: Number
, maxPoleWidth :: Number
, birdX :: Number
}
newtype Player = Player (GameState -> PlayerCommand)
data PlayerCommand
= Jump
| Wait
renderState :: Context2D -> GameState -> Effect Unit
renderState ctx state = do
clearRect ctx
{ x: 0.0
, y: 0.0
, width: fst state.generationSettings.screen
, height: snd state.generationSettings.screen
}
setFillStyle ctx "green"
for_ state.poles \pole -> do
fillRect ctx
{ x: pole. }
setFillStyle ctx "blue"
fillPath ctx do
arc ctx
{ start: 0.0
, end: tau
, radius: state.birdRadius
, x: state.generationSettings.birdX
, y: state.birdY
}
simulate :: Number -> GameState -> Effect GameState
simulate delta { jumpForce, player, birdRadius, generationSettings, gravity, birdY, birdVelocity, poleVelocity, poles } = do
let
newVelocity = birdVelocity + gravity * delta
state =
{ birdVelocity: newVelocity
, poleVelocity
, gravity
, birdRadius
, generationSettings
, jumpForce
, birdY: clamp birdRadius
(snd generationSettings.screen - birdRadius)
(birdY + delta * newVelocity)
, poles: poles # movePoles (delta * poleVelocity)
# deleteOffScreenPoles
, player
}
newPoles <- generatePoles state
let
state' = state
{ poles = state.poles <> newPoles
}
pure $ runPlayer state'
runPlayer :: GameState -> GameState
runPlayer state | Player player <- state.player = case player state of
Wait -> state
Jump -> state
{ birdVelocity = state.jumpForce
}
movePoles :: Number -> Array Pole -> Array Pole
movePoles amount = map (movePole amount)
movePole :: Number -> Pole -> Pole
movePole amount pole = pole
{ x = pole.x - amount }
deleteOffScreenPoles :: Array Pole -> Array Pole
deleteOffScreenPoles = filter isOffScreen
where
isOffScreen { x, width } = x + width < 0.0
generatePoles :: GameState -> Effect (Array Pole)
generatePoles state =
if lastPoleBound + state.generationSettings.minXGap < fst state.generationSettings.screen then
do
y <- randomRange state.generationSettings.minPoleHeight
( snd state.generationSettings.screen
- state.generationSettings.minPoleHeight
- state.generationSettings.minYGap
)
pure
[ { width: state.generationSettings.maxPoleWidth
, gapHeight: state.generationSettings.minYGap
, gapY: y
, x: fst state.generationSettings.screen + state.generationSettings.minXGap
}
]
else pure []
where
lastPoleBound :: Number
lastPoleBound = case Array.last state.poles of
Nothing -> 0.0
Just pole -> pole.x + pole.width

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module Main where
import Prelude
import Data.Tuple (snd)
import Data.Tuple.Nested ((/\), type (/\))
import Effect (Effect)
import Effect.Ref as Ref
import Game (GameState, Player(..), PlayerCommand(..), renderState, simulate)
import Graphics.Canvas (Context2D)
type AppConfig =
{ context :: Context2D
, loop :: (Number -> Effect Unit) -> Effect Unit
}
screenSize :: Number /\ Number
screenSize = 1000.0 /\ 700.0
initialState :: GameState
initialState =
{ birdRadius: 10.0
, birdVelocity: 0.0
, birdY: snd screenSize / 2.0
, generationSettings:
{ maxPoleWidth: 40.0
, minPoleHeight: 70.0
, minXGap: 100.0
, minYGap: 100.0
, screen: screenSize
, birdX: 100.0
}
, poleVelocity: 3.0
, poles: []
, gravity: 0.003
, jumpForce: -0.5
, player: Player \{ birdVelocity } -> if birdVelocity > 0.5 then Jump else Wait
}
main :: AppConfig -> Effect Unit
main { context, loop } = do
state <- Ref.new initialState
loop \delta -> do
current <- Ref.read state
updated <- simulate delta current
Ref.write updated state
renderState context updated

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// @ts-ignore purescript code
import { main } from "./Main.purs";
console.log("hello world");
const canvas = document.getElementById("canvas")! as HTMLCanvasElement;
const context = canvas.getContext("2d");
let lastTick = performance.now();
const loop = (effect: (n: number) => () => void) => () => {
requestAnimationFrame(() => {
const now = performance.now();
const delta = now - lastTick;
lastTick = now;
effect(delta)();
loop(effect)();
});
};
main({ context, loop })();

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purescript/purebird/test/Main.purs Normal file
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module Test.Main where
import Prelude
import Effect (Effect)
import Effect.Class.Console (log)
main :: Effect Unit
main = do
log "🍝"
log "You should add some tests."