Initial OSS commit

packages/playground/.gitignore

@@ -0,0 +1 @@
+/dist

packages/playground/LICENSE

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+
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packages/playground/devEnv/servePlayground.ts

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+import path from 'path'
+import {
+  convertObjectToWebpackDefinePaths,
+  getEnvConfig,
+} from '../../../theatre/devEnv/webpack/createWebpackConfig'
+
+const playgroundDir = path.join(__dirname, '..')
+
+const envConfig = getEnvConfig(true)
+
+const port = 8080
+
+require('esbuild')
+  .serve(
+    {
+      port,
+      servedir: path.join(playgroundDir, 'src'),
+    },
+    {
+      entryPoints: [path.join(playgroundDir, 'src/index.tsx')],
+      target: ['firefox88'],
+      loader: {'.png': 'file'},
+      // outdir: '.',
+      // watch: true,
+      bundle: true,
+      sourcemap: true,
+      define: {
+        global: 'window',
+        '$env.isCore': false,
+        ...convertObjectToWebpackDefinePaths({
+          process: {env: envConfig},
+          $env: envConfig,
+        }),
+      },
+    },
+  )
+  .then((server: unknown) => {
+    console.log('serving', 'http://localhost:' + port)
+  })

packages/playground/package.json

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+{
+  "name": "playground",
+  "version": "1.0.0-dev",
+  "license": "Apache-2.0",
+  "source": "src/index.tsx",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "files": [
+    "dist/**/*"
+  ],
+  "scripts": {
+    "serve": "node -r esbuild-register devEnv/servePlayground.ts",
+    "typecheck": "yarn run build",
+    "build": "tsc --build ./tsconfig.json"
+  },
+  "devDependencies": {
+    "@react-three/drei": "^5.3.1",
+    "@react-three/fiber": "^6.2.2",
+    "@theatre/core": "workspace:*",
+    "@theatre/plugin-r3f": "workspace:*",
+    "@theatre/studio": "workspace:*",
+    "@types/jest": "^26.0.23",
+    "@types/lodash-es": "^4.17.4",
+    "@types/node": "^15.6.2",
+    "@types/react": "^17.0.9",
+    "esbuild": "^0.12.5",
+    "esbuild-register": "^2.5.0",
+    "three": "^0.129.0",
+    "typescript": "^4.3.2"
+  },
+  "dependencies": {
+    "autoprefixer": "^10.2.6",
+    "esbuild-plugin-postcss2": "^0.0.9",
+    "tailwindcss": "^2.1.2"
+  }
+}

packages/playground/src/dom/Scene.tsx

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+import studio from '@theatre/studio'
+import type {UseDragOpts} from '@theatre/studio/uiComponents/useDrag'
+import useDrag from '@theatre/studio/uiComponents/useDrag'
+import React, {useLayoutEffect, useMemo, useState} from 'react'
+import type {IProject, ISheet, ISheetObject} from '@theatre/core'
+import {types as t} from '@theatre/core'
+import type {IScrub, IStudio} from '@theatre/studio'
+
+const boxObjectConfig = {
+  props: t.compound({
+    x: t.number(0),
+    y: t.number(0),
+  }),
+}
+
+const Box: React.FC<{
+  id: string
+  sheet: ISheet
+  selection: ISheetObject[]
+}> = ({id, sheet, selection}) => {
+  // This is cheap to call and always returns the same value, so no need for useMemo()
+  const obj = sheet.object(id, null, boxObjectConfig)
+
+  const isSelected = selection.includes(obj)
+
+  const [pos, setPos] = useState<{x: number; y: number}>({x: 0, y: 0})
+
+  useLayoutEffect(() => {
+    const unsubscribeFromChanges = obj.onValuesChange((newValues) => {
+      setPos(newValues)
+    })
+    return unsubscribeFromChanges
+  }, [id])
+
+  const [divRef, setDivRef] = useState<HTMLElement | null>(null)
+
+  const dragOpts = useMemo((): UseDragOpts => {
+    let scrub: IScrub | undefined
+    let initial: typeof obj.value
+    let firstOnDragCalled = false
+    return {
+      onDragStart() {
+        scrub = studio.scrub()
+        initial = obj.value
+        firstOnDragCalled = false
+      },
+      onDrag(x, y) {
+        if (!firstOnDragCalled) {
+          studio.__experimental_setSelection([obj])
+          firstOnDragCalled = true
+        }
+        scrub!.capture(({set}) => {
+          set(obj.props, {x: x + initial.x, y: y + initial.y})
+        })
+      },
+      onDragEnd(dragHappened) {
+        if (dragHappened) {
+          scrub!.commit()
+        } else {
+          scrub!.discard()
+        }
+      },
+      lockCursorTo: 'move',
+    }
+  }, [])
+
+  useDrag(divRef, dragOpts)
+
+  return (
+    <div
+      onClick={() => {
+        studio.__experimental_setSelection([obj])
+      }}
+      ref={setDivRef}
+      style={{
+        width: 100,
+        height: 100,
+        background: 'gray',
+        position: 'absolute',
+        left: pos.x + 'px',
+        top: pos.y + 'px',
+        boxSizing: 'border-box',
+        border: isSelected ? '1px solid #5a92fa' : '1px solid transparent',
+      }}
+    ></div>
+  )
+}
+
+let lastBoxId = 1
+
+export const Scene: React.FC<{project: IProject}> = ({project}) => {
+  const [boxes, setBoxes] = useState<Array<string>>(['0', '1'])
+
+  // This is cheap to call and always returns the same value, so no need for useMemo()
+  const sheet = project.sheet('Scene', 'default')
+  const [selection, setSelection] = useState<IStudio['selection']>()
+
+  useLayoutEffect(() => {
+    return studio.__experimental_onSelectionChange((newState) => {
+      setSelection(newState)
+    })
+  })
+
+  return (
+    <div
+      style={{
+        position: 'absolute',
+        left: '20vw',
+        right: '20vw',
+        top: 0,
+        bottom: '30vh',
+        background: 'black',
+      }}
+    >
+      <button
+        onClick={() => {
+          setBoxes((boxes) => [...boxes, String(++lastBoxId)])
+        }}
+      >
+        Add
+      </button>
+      {boxes.map((id) => (
+        <Box
+          key={'box' + id}
+          id={id}
+          sheet={sheet}
+          selection={selection ?? []}
+        />
+      ))}
+    </div>
+  )
+}

packages/playground/src/dom/index.tsx

@@ -0,0 +1,12 @@
+import React from 'react'
+import ReactDOM from 'react-dom'
+import studio from '@theatre/studio'
+import {getProject} from '@theatre/core'
+import {Scene} from './Scene'
+
+studio.ui
+
+ReactDOM.render(
+  <Scene project={getProject('Sample project')} />,
+  document.getElementById('root'),
+)

packages/playground/src/index.html

@@ -0,0 +1,19 @@
+<html>
+  <head>
+    <meta charset="UTF-8" />
+    <title>Playground – Theatre.js</title>
+    <style>
+      body {
+        margin: 0;
+        padding: 0;
+        height: 100%;
+      }
+    </style>
+  </head>
+
+  <body>
+    <div id="root"></div>
+
+    <script src="./index.js"></script>
+  </body>
+</html>

packages/playground/src/index.tsx

@@ -0,0 +1 @@
+import './r3f'

packages/playground/src/playground-globals.d.ts

@@ -0,0 +1,3 @@
+declare module '*.png' {
+  export default string
+}

packages/playground/src/r3f/App.tsx

@@ -0,0 +1,157 @@
+import {editable as e, configure} from '@theatre/plugin-r3f'
+import {PerspectiveCamera} from '@react-three/drei'
+import {getProject} from '@theatre/core'
+import * as THREE from 'three'
+import React, {useState, useEffect, useRef} from 'react'
+import type {Color} from '@react-three/fiber'
+import {Canvas, useFrame} from '@react-three/fiber'
+import {softShadows, Shadow} from '@react-three/drei'
+import type {DirectionalLight} from 'three'
+import type {$FixMe} from '../../../plugin-r3f/src/types'
+
+const ECamera = e(PerspectiveCamera, 'perspectiveCamera')
+
+const bindToCanvas = configure({})
+
+// Soft shadows are expensive, comment and refresh when it's too slow
+softShadows()
+
+// credit: https://codesandbox.io/s/camera-pan-nsb7f
+
+function Button() {
+  const vec = new THREE.Vector3()
+  const light = useRef<DirectionalLight>(undefined as any)
+  const [active, setActive] = useState(false)
+  const [zoom, set] = useState(true)
+  useEffect(
+    () => void (document.body.style.cursor = active ? 'pointer' : 'auto'),
+    [active],
+  )
+
+  useFrame((state) => {
+    const step = 0.1
+    const camera = state.camera as THREE.PerspectiveCamera
+    camera.fov = (THREE as $FixMe).MathUtils.lerp(
+      camera.fov,
+      zoom ? 10 : 42,
+      step,
+    )
+    camera.position.lerp(
+      vec.set(zoom ? 25 : 10, zoom ? 1 : 5, zoom ? 0 : 10),
+      step,
+    )
+    state.camera.lookAt(0, 0, 0)
+    state.camera.updateProjectionMatrix()
+
+    light.current.position.lerp(
+      vec.set(zoom ? 4 : 0, zoom ? 3 : 8, zoom ? 3 : 5),
+      step,
+    )
+  })
+
+  return (
+    <e.mesh
+      receiveShadow
+      castShadow
+      onClick={() => set(!zoom)}
+      onPointerOver={() => setActive(true)}
+      onPointerOut={() => setActive(false)}
+      uniqueName="The Button"
+    >
+      <sphereBufferGeometry args={[0.75, 64, 64]} />
+      <meshPhysicalMaterial
+        color={active ? 'purple' : '#e7b056'}
+        clearcoat={1}
+        clearcoatRoughness={0}
+      />
+      <Shadow
+        position-y={-0.79}
+        rotation-x={-Math.PI / 2}
+        opacity={0.6}
+        scale={[0.8, 0.8, 1]}
+      />
+      <directionalLight
+        ref={light}
+        castShadow
+        intensity={1.5}
+        shadow-camera-far={70}
+      />
+    </e.mesh>
+  )
+}
+
+function Plane({
+  color,
+  uniqueName,
+  ...props
+}: {color: Color; uniqueName: string} & Parameters<typeof e.mesh>[0]) {
+  return (
+    <e.mesh receiveShadow castShadow {...props} uniqueName={uniqueName}>
+      <boxBufferGeometry />
+      <meshStandardMaterial color={color as any} />
+    </e.mesh>
+  )
+}
+
+function App() {
+  return (
+    <div>
+      <Canvas
+        // @ts-ignore
+        shadowMap
+        onCreated={bindToCanvas({
+          sheet: getProject('Example project').sheet('R3F-Canvas'),
+        })}
+      >
+        <ECamera makeDefault uniqueName="Camera" />
+        <ambientLight intensity={0.4} />
+        <e.pointLight
+          position={[-10, -10, 5]}
+          intensity={2}
+          color="#ff20f0"
+          uniqueName="Light 1"
+        />
+        <e.pointLight
+          position={[0, 0.5, -1]}
+          distance={1}
+          intensity={2}
+          color="#e4be00"
+          uniqueName="Light 2"
+        />
+        <group position={[0, -0.9, -3]}>
+          <Plane
+            color="hotpink"
+            rotation-x={-Math.PI / 2}
+            position-z={2}
+            scale={[4, 20, 0.2]}
+            uniqueName="plane1"
+          />
+          <Plane
+            color="#e4be00"
+            rotation-x={-Math.PI / 2}
+            position-y={1}
+            scale={[4.2, 0.2, 4]}
+            uniqueName="plane2"
+          />
+          <Plane
+            color="#736fbd"
+            rotation-x={-Math.PI / 2}
+            position={[-1.7, 1, 3.5]}
+            scale={[0.5, 4, 4]}
+            uniqueName="plane3"
+          />
+          <Plane
+            color="white"
+            rotation-x={-Math.PI / 2}
+            position={[0, 4.5, 3]}
+            scale={[2, 0.03, 4]}
+            uniqueName="plane4"
+          />
+        </group>
+        <Button />
+      </Canvas>
+    </div>
+  )
+}
+
+export default App

packages/playground/src/r3f/index.css

@@ -0,0 +1,16 @@
+* {
+  box-sizing: border-box;
+}
+
+html,
+body,
+#root {
+  width: 100%;
+  height: 100%;
+  margin: 0;
+  padding: 0;
+}
+
+body {
+  background: white;
+}

packages/playground/src/r3f/index.tsx

@@ -0,0 +1,6 @@
+import React from 'react'
+import ReactDOM from 'react-dom'
+import './index.css'
+import App from './App'
+
+ReactDOM.render(<App />, document.getElementById('root'))

packages/playground/src/redesign/Scene.tsx

@@ -0,0 +1,150 @@
+import type {UseDragOpts} from '@theatre/studio/uiComponents/useDrag'
+import useDrag from '@theatre/studio/uiComponents/useDrag'
+import React, {useLayoutEffect, useMemo, useState} from 'react'
+import studio from '@theatre/studio'
+import type {IProject, ISheet, ISheetObject} from '@theatre/core'
+import {types as t} from '@theatre/core'
+import type {IScrub, IStudio} from '@theatre/studio'
+
+const boxObjectConfig = {
+  props: t.compound({
+    position: t.compound({
+      x: t.number(0),
+      y: t.number(0),
+      z: t.number(0),
+    }),
+    scale: t.compound({
+      x: t.number(0),
+      y: t.number(0),
+      z: t.number(0),
+      origin: t.compound({
+        x: t.number(0),
+        y: t.number(0),
+      }),
+      w: t.number(0),
+    }),
+  }),
+}
+
+const Box: React.FC<{
+  id: string
+  sheet: ISheet
+  selection: ISheetObject[]
+}> = ({id, sheet, selection: selection}) => {
+  // This is cheap to call and always returns the same value, so no need for useMemo()
+  const obj = sheet.object('object ' + id, null, boxObjectConfig)
+
+  const isSelected = selection.includes(obj)
+
+  const [pos, setPos] = useState<{x: number; y: number}>({x: 0, y: 0})
+
+  useLayoutEffect(() => {
+    const unsubscribeFromChanges = obj.onValuesChange((newValues) => {
+      setPos(newValues.position)
+    })
+    return unsubscribeFromChanges
+  }, [id])
+
+  const [divRef, setDivRef] = useState<HTMLElement | null>(null)
+
+  const dragOpts = useMemo((): UseDragOpts => {
+    let scrub: IScrub | undefined
+    let initial: typeof obj.value.position
+    let firstOnDragCalled = false
+    return {
+      onDragStart() {
+        scrub = studio.scrub()
+        initial = obj.value.position
+        firstOnDragCalled = false
+      },
+      onDrag(x, y) {
+        if (!firstOnDragCalled) {
+          studio.__experimental_setSelection([obj])
+          firstOnDragCalled = true
+        }
+        scrub!.capture(({set}) => {
+          set(obj.props.position, {
+            x: x + initial.x,
+            y: y + initial.y,
+            z: 0,
+          })
+        })
+      },
+      onDragEnd(dragHappened) {
+        if (dragHappened) {
+          scrub!.commit()
+        } else {
+          scrub!.discard()
+        }
+      },
+      lockCursorTo: 'move',
+    }
+  }, [])
+
+  useDrag(divRef, dragOpts)
+
+  return (
+    <div
+      onClick={() => {
+        studio.__experimental_setSelection([obj])
+      }}
+      ref={setDivRef}
+      style={{
+        width: 100,
+        height: 100,
+        background: 'gray',
+        position: 'absolute',
+        left: pos.x + 'px',
+        top: pos.y + 'px',
+        boxSizing: 'border-box',
+        border: isSelected ? '1px solid #5a92fa' : '1px solid transparent',
+      }}
+    ></div>
+  )
+}
+
+let lastBoxId = 1
+
+export const Scene: React.FC<{project: IProject}> = ({project}) => {
+  const [boxes, setBoxes] = useState<Array<string>>(['0', '1'])
+
+  // This is cheap to call and always returns the same value, so no need for useMemo()
+  const sheet = project.sheet('Scene', 'default')
+  const [selection, setSelection] = useState<IStudio['selection']>()
+
+  useLayoutEffect(() => {
+    return studio.__experimental_onSelectionChange((newState) => {
+      setSelection(newState)
+    })
+  })
+
+  return (
+    <div
+      style={{
+        position: 'absolute',
+        left: '20vw',
+        right: '20vw',
+        top: 0,
+        bottom: '30vh',
+        background: 'black',
+        display: 'none',
+      }}
+    >
+      <button
+        onClick={() => {
+          setBoxes((boxes) => [...boxes, String(++lastBoxId)])
+        }}
+      >
+        Add
+      </button>
+      {boxes.map((id) => (
+        <Box
+          key={'box' + id}
+          id={id}
+          sheet={sheet}
+          selection={selection ?? []}
+        />
+      ))}
+    </div>
+  )
+}

packages/playground/src/redesign/index.tsx

@@ -0,0 +1,33 @@
+import React from 'react'
+import ReactDOM from 'react-dom'
+import studio from '@theatre/studio'
+import {getProject} from '@theatre/core'
+import {Scene} from './Scene'
+import bg from '../../xeno/bgs/8.png'
+
+studio.ui
+
+document.body.style.cssText = `
+  background-image: url(${bg});
+  background-color: #3A3A39;
+  background-position: center bottom;
+  background-size: calc(100% - 0px);
+  background-repeat: no-repeat;
+`
+;(function renderDragArea() {
+  const div = document.createElement('div')
+  div.style.cssText = `
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 80px;
+    height: 20px;
+    -webkit-app-region: drag;
+  `
+  document.body.appendChild(div)
+})()
+
+ReactDOM.render(
+  <Scene project={getProject('Sample project')} />,
+  document.getElementById('root'),
+)

packages/playground/src/turtle/TurtleRenderer.tsx

@@ -0,0 +1,152 @@
+import type {MutableRefObject} from 'react'
+import React, {
+  useCallback,
+  useEffect,
+  useLayoutEffect,
+  useMemo,
+  useRef,
+  useState,
+} from 'react'
+import studio from '@theatre/studio'
+import type {ISheet} from '@theatre/core'
+import {types} from '@theatre/core'
+import type {ITurtle} from './turtle'
+import {drawTurtlePlan, makeTurtlePlan} from './turtle'
+
+const objConfig = {
+  props: types.compound({
+    startingPoint: types.compound({
+      x: types.number(0.5, {min: 0, max: 1}),
+      y: types.number(0.5, {min: 0, max: 1}),
+    }),
+    scale: types.number(1, {min: 0.1}),
+  }),
+}
+
+const TurtleRenderer: React.FC<{
+  sheet: ISheet
+  objKey: string
+  width: number
+  height: number
+  programFn: (t: ITurtle) => void
+}> = (props) => {
+  const [canvas, setCanvas] = useState<HTMLCanvasElement | null>(null)
+
+  const context = useMemo(() => {
+    if (canvas) {
+      return canvas.getContext('2d')!
+    }
+  }, [canvas])
+
+  const dimsRef = useRef({width: props.width, height: props.height})
+  dimsRef.current = {width: props.width, height: props.height}
+
+  const obj = useMemo(() => {
+    return props.sheet.object(props.objKey, null, objConfig)
+  }, [props.sheet, props.objKey])
+
+  useEffect(() => {
+    obj.onValuesChange((v) => {
+      setTransforms(v)
+    })
+  }, [obj])
+
+  const [transforms, transformsRef, setTransforms] = useStateAndRef<
+    typeof obj.value
+  >({scale: 1, startingPoint: {x: 0.5, y: 0.5}})
+
+  const bounds = useMemo(() => canvas?.getBoundingClientRect(), [canvas])
+
+  useLayoutEffect(() => {
+    if (!canvas) return
+
+    const receiveWheelEvent = (event: WheelEvent) => {
+      event.preventDefault()
+      event.stopPropagation()
+      const oldTransform = transformsRef.current
+      const newTransform: typeof oldTransform = {
+        ...oldTransform,
+        startingPoint: {...oldTransform.startingPoint},
+      }
+
+      if (event.ctrlKey) {
+        const scaleFactor = 1 - (event.deltaY / dimsRef.current.height) * 1.2
+        newTransform.scale *= scaleFactor
+
+        // const bounds = canvas.getBoundingClientRect()
+
+        const anchorPoint = {
+          x: (event.clientX - bounds!.left) / dimsRef.current.width,
+          y: (event.clientY - bounds!.top) / dimsRef.current.height,
+        }
+
+        newTransform.startingPoint.x =
+          anchorPoint.x -
+          (anchorPoint.x - newTransform.startingPoint.x) * scaleFactor
+
+        newTransform.startingPoint.y =
+          anchorPoint.y -
+          (anchorPoint.y - newTransform.startingPoint.y) * scaleFactor
+      } else {
+        newTransform.startingPoint.x =
+          oldTransform.startingPoint.x - event.deltaX / dimsRef.current.width
+        newTransform.startingPoint.y =
+          oldTransform.startingPoint.y - event.deltaY / dimsRef.current.height
+      }
+      studio.transaction((api) => {
+        api.set(obj.props, newTransform)
+      })
+      // setTransforms(newTransform)
+    }
+
+    const listenerOptions = {
+      capture: true,
+      passive: false,
+    }
+    canvas.addEventListener('wheel', receiveWheelEvent, listenerOptions)
+
+    return () => {
+      canvas.removeEventListener('wheel', receiveWheelEvent, listenerOptions)
+    }
+  }, [canvas])
+
+  const plan = useMemo(() => makeTurtlePlan(props.programFn), [props.programFn])
+
+  useEffect(() => {
+    if (!context) return
+
+    drawTurtlePlan(
+      plan,
+      context,
+      {
+        width: props.width,
+        height: props.height,
+        scale: transforms.scale,
+        startFrom: {
+          x: transforms.startingPoint.x * props.width,
+          y: transforms.startingPoint.y * props.height,
+        },
+      },
+      1,
+    )
+  }, [props.width, props.height, plan, context, transforms])
+
+  return (
+    <canvas width={props.width} height={props.height} ref={setCanvas}></canvas>
+  )
+}
+
+function useStateAndRef<S>(
+  initial: S,
+): [S, MutableRefObject<S>, (s: S) => void] {
+  const [state, setState] = useState(initial)
+  const stateRef = useRef(state)
+  const set = useCallback((s: S) => {
+    stateRef.current = s
+    setState(s)
+  }, [])
+
+  return [state, stateRef, set]
+}
+
+export default TurtleRenderer

packages/playground/src/turtle/index.tsx

@@ -0,0 +1,52 @@
+// sdf
+import React, {useMemo, useState} from 'react'
+import {render} from 'react-dom'
+import {getProject} from '@theatre/core'
+import type {ITurtle} from './turtle'
+import TurtleRenderer from './TurtleRenderer'
+import {useBoundingClientRect} from './utils'
+
+const project = getProject('Turtle Playground')
+
+const sheet = project.sheet('Turtle', 'The only one')
+
+const TurtleExample: React.FC<{}> = (props) => {
+  const [container, setContainer] = useState<HTMLDivElement | null>(null)
+  const programFn = useMemo(() => {
+    return ({forward, backward, left, right, repeat}: ITurtle) => {
+      const steps = 10
+      repeat(steps, () => {
+        forward(steps * 2)
+        right(360 / steps)
+      })
+    }
+  }, [])
+
+  const bounds = useBoundingClientRect(container)
+
+  return (
+    <div
+      ref={setContainer}
+      style={{
+        position: 'fixed',
+        top: '0',
+        right: '20vw',
+        bottom: '30vh',
+        left: '20vw',
+        background: 'black',
+      }}
+    >
+      {bounds && (
+        <TurtleRenderer
+          sheet={sheet}
+          objKey="Renderer"
+          width={bounds.width}
+          height={bounds.height}
+          programFn={programFn}
+        />
+      )}
+    </div>
+  )
+}
+
+render(<TurtleExample />, document.getElementById('root'))

packages/playground/src/turtle/turtle.ts

@@ -0,0 +1,189 @@
+import clamp from 'lodash-es/clamp'
+
+type Op_Move = {
+  type: 'Move'
+  amount: number
+  angle: number
+  penDown: boolean
+}
+
+type Op_ModifyContext = {
+  type: 'ContextModifier'
+  fn: (ctx: CanvasRenderingContext2D) => void
+}
+
+type Op = Op_ModifyContext | Op_Move
+
+type IPlan = {
+  totalTravel: number
+  ops: Op[]
+}
+
+export function makeTurtlePlan(fn: (turtle: Turtle) => void): IPlan {
+  const plan: IPlan = {
+    totalTravel: 0,
+    ops: [],
+  }
+
+  const turtle = new Turtle(plan)
+  fn(turtle)
+  return plan
+}
+
+export function drawTurtlePlan(
+  plan: IPlan,
+  ctx: CanvasRenderingContext2D,
+  {
+    width,
+    height,
+    scale,
+    startFrom,
+  }: {
+    width: number
+    height: number
+    scale: number
+    startFrom: {x: number; y: number}
+  },
+  tilProgression: number,
+): void {
+  const {ops} = plan
+  if (ops.length === 0) return
+
+  const targetDistance = clamp(tilProgression, 0, 1) * plan.totalTravel
+
+  ctx.clearRect(0, 0, width, height)
+
+  let traveledSoFar = 0
+  let pos = {...startFrom}
+  ctx.beginPath()
+  ctx.lineWidth = 2
+  ctx.strokeStyle = 'white'
+  ctx.moveTo(pos.x, pos.y)
+
+  for (const op of ops) {
+    if (traveledSoFar >= targetDistance) return
+
+    if (op.type === 'ContextModifier') {
+      op.fn(ctx)
+    } else {
+      let amount = Math.abs(op.amount)
+      const sign = op.amount < 0 ? -1 : 1
+      const {angle} = op
+
+      const roomTilTarget = targetDistance - traveledSoFar
+
+      const distanceInThisStep = roomTilTarget < amount ? roomTilTarget : amount
+
+      traveledSoFar += distanceInThisStep
+
+      pos = move(pos, angle, distanceInThisStep * sign, scale, op.penDown, ctx)
+      ctx.stroke()
+    }
+  }
+}
+
+function move(
+  pointA: {x: number; y: number},
+  _angle: number,
+  amount: number,
+  scale: number,
+  penIsDown: boolean,
+  ctx: CanvasRenderingContext2D,
+): {x: number; y: number} {
+  const angle = (_angle * Math.PI) / 180
+
+  const unrotatedTarget = {
+    x: pointA.x + amount * scale,
+    y: pointA.y,
+  }
+
+  const pointB = {
+    x:
+      pointA.x +
+      Math.cos(angle) * (unrotatedTarget.x - pointA.x) -
+      Math.sin(angle) * (unrotatedTarget.y - pointA.y),
+    y:
+      pointA.y +
+      Math.sin(angle) * (unrotatedTarget.x - pointA.x) -
+      Math.sin(angle) * (unrotatedTarget.y - pointA.y),
+  }
+
+  if (penIsDown) {
+    ctx.lineTo(pointB.x, pointB.y)
+  } else {
+    ctx.moveTo(pointB.x, pointB.y)
+  }
+
+  return pointB
+}
+
+class Turtle {
+  private _state = {
+    penIsDown: true,
+    angle: -90,
+  }
+
+  constructor(private _plan: IPlan) {}
+
+  fn = (innerFn: () => void) => {
+    return innerFn
+  }
+
+  private _pushContextModifier(fn: (ctx: CanvasRenderingContext2D) => void) {
+    this._plan.ops.push({type: 'ContextModifier', fn})
+  }
+
+  press = (n: number) => {
+    this._pushContextModifier((ctx) => {
+      ctx.lineWidth = n
+    })
+  }
+
+  forward = (amount: number) => {
+    this._plan.ops.push({
+      type: 'Move',
+      amount,
+      penDown: this._state.penIsDown,
+      angle: this._state.angle,
+    })
+    this._plan.totalTravel += Math.abs(amount)
+    return this
+  }
+
+  backward = (amount: number) => {
+    return this.forward(amount)
+  }
+
+  right = (deg: number) => {
+    this._rotate(deg)
+    return this
+  }
+
+  left = (deg: number) => {
+    this._rotate(-deg)
+    return this
+  }
+
+  private _rotate(deg: number) {
+    this._state.angle += deg
+  }
+
+  penup = () => {
+    this._state.penIsDown = false
+    return this
+  }
+
+  pendown = () => {
+    this._state.penIsDown = true
+    return this
+  }
+
+  repeat = (n: number, fn: (i: number) => void) => {
+    for (let i = 0; i < n; i++) {
+      fn(i)
+    }
+    return this
+  }
+}
+
+export type ITurtle = Turtle

packages/playground/src/turtle/utils.ts

@@ -0,0 +1,19 @@
+import {useLayoutEffect, useState} from 'react'
+
+export function useBoundingClientRect(
+  node: HTMLElement | null,
+): null | DOMRect {
+  const [bounds, set] = useState<null | DOMRect>(null)
+
+  useLayoutEffect(() => {
+    if (node) {
+      set(node.getBoundingClientRect())
+    }
+
+    return () => {
+      set(null)
+    }
+  }, [node])
+
+  return bounds
+}

packages/playground/tsconfig.json

@@ -0,0 +1,17 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "dist",
+    "lib": ["ESNext", "DOM"],
+    "rootDir": ".",
+    "types": ["jest", "node"],
+    "emitDeclarationOnly": false,
+    "composite": true
+  },
+  "references": [
+    {"path": "../../theatre"},
+    {"path": "../dataverse"},
+    {"path": "../plugin-r3f"}
+  ],
+  "include": ["./src/**/*", "./devEnv/**/*"]
+}