[fix] rotate center (#213)

* fixes rotate center after translating / transforming

* Adds test, fixes issue on undo/redo

* Update tsconfig.base.json

packages/tldraw/package.json

@@ -66,7 +66,7 @@
     "@radix-ui/react-tooltip": "^0.1.1",
     "@stitches/core": "^1.2.5",
     "@stitches/react": "^1.0.0",
-    "@tldraw/core": "^0.1.9",
+    "@tldraw/core": "^0.1.10",
     "@tldraw/intersect": "^0.0.132",
     "@tldraw/vec": "^0.0.132",
     "perfect-freehand": "^1.0.16",

packages/tldraw/src/state/command/translate/translate.command.ts

@@ -1,10 +1,13 @@
 import { Vec } from '@tldraw/vec'
-import type { Data, TLDrawCommand, PagePartial } from '~types'
+import { Data, TLDrawCommand, PagePartial, Session } from '~types'
 import { TLDR } from '~state/tldr'
 
 export function translate(data: Data, ids: string[], delta: number[]): TLDrawCommand {
   const { currentPageId } = data.appState
 
+  // Clear session cache
+  Session.cache.selectedIds = TLDR.getSelectedIds(data, data.appState.currentPageId)
+
   const before: PagePartial = {
     shapes: {},
     bindings: {},

packages/tldraw/src/state/session/sessions/rotate/rotate.session.spec.ts

@@ -119,16 +119,64 @@ describe('Rotate session', () => {
         )
       )
 
-      tlstate.startSession(SessionType.Rotate, [50, 0]).updateSession([100, 50])
+      tlstate.startSession(SessionType.Rotate, [50, 0]).updateSession([100, 50]).completeSession()
 
-      const centerAfter = Vec.round(
+      const centerAfterA = Vec.round(
+        Utils.getBoundsCenter(
+          Utils.getCommonBounds(tlstate.selectedIds.map((id) => tlstate.getShapeBounds(id)))
+        )
+      )
+
+      tlstate.startSession(SessionType.Rotate, [100, 0]).updateSession([50, 0]).completeSession()
+
+      const centerAfterB = Vec.round(
         Utils.getBoundsCenter(
           Utils.getCommonBounds(tlstate.selectedIds.map((id) => tlstate.getShapeBounds(id)))
         )
       )
 
       expect(tlstate.getShape('rect1').rotation)
-      expect(centerBefore).toStrictEqual(centerAfter)
+      expect(centerBefore).toStrictEqual(centerAfterA)
+      expect(centerAfterA).toStrictEqual(centerAfterB)
+    })
+
+    it.todo('clears the cached center after transforming')
+    it.todo('clears the cached center after translating')
+    it.todo('clears the cached center after undoing')
+    it.todo('clears the cached center after redoing')
+    it.todo('clears the cached center after any command other than a rotate command, tbh')
+
+    it('changes the center after nudging', () => {
+      const tlstate = new TLDrawState().loadDocument(mockDocument).select('rect1', 'rect2')
+
+      const centerBefore = Vec.round(
+        Utils.getBoundsCenter(
+          Utils.getCommonBounds(tlstate.selectedIds.map((id) => tlstate.getShapeBounds(id)))
+        )
+      )
+
+      tlstate.startSession(SessionType.Rotate, [50, 0]).updateSession([100, 50]).completeSession()
+
+      const centerAfterA = Vec.round(
+        Utils.getBoundsCenter(
+          Utils.getCommonBounds(tlstate.selectedIds.map((id) => tlstate.getShapeBounds(id)))
+        )
+      )
+
+      expect(tlstate.getShape('rect1').rotation)
+      expect(centerBefore).toStrictEqual(centerAfterA)
+
+      tlstate.selectAll().nudge([10, 10])
+
+      tlstate.startSession(SessionType.Rotate, [50, 0]).updateSession([100, 50]).completeSession()
+
+      const centerAfterB = Vec.round(
+        Utils.getBoundsCenter(
+          Utils.getCommonBounds(tlstate.selectedIds.map((id) => tlstate.getShapeBounds(id)))
+        )
+      )
+
+      expect(centerAfterB).not.toStrictEqual(centerAfterA)
     })
   })
 })

packages/tldraw/src/state/session/sessions/rotate/rotate.session.ts

@@ -4,8 +4,6 @@ import { Session, SessionType, TLDrawShape, TLDrawStatus } from '~types'
 import type { Data } from '~types'
 import { TLDR } from '~state/tldr'
 
-const centerCache = new WeakMap<string[], number[]>()
-
 export class RotateSession extends Session {
   static type = SessionType.Rotate
   status = TLDrawStatus.Transforming
@@ -17,6 +15,7 @@ export class RotateSession extends Session {
 
   constructor(data: Data, viewport: TLBounds, point: number[]) {
     super(viewport)
+
     this.origin = point
     this.snapshot = getRotateSnapshot(data)
     this.initialAngle = Vec.angle(this.snapshot.commonBoundsCenter, this.origin)
@@ -134,19 +133,25 @@ export function getRotateSnapshot(data: Data) {
   const pageState = TLDR.getPageState(data, currentPageId)
   const initialShapes = TLDR.getSelectedBranchSnapshot(data, currentPageId)
 
-  const commonBoundsCenter = Utils.getFromCache(centerCache, pageState.selectedIds, () => {
   if (initialShapes.length === 0) {
     throw Error('No selected shapes!')
   }
 
-    const shapesBounds = Object.fromEntries(
-      initialShapes.map((shape) => [shape.id, TLDR.getBounds(shape)])
+  let commonBoundsCenter: number[]
+
+  if (Session.cache.selectedIds === pageState.selectedIds) {
+    if (Session.cache.center === undefined) {
+      throw Error('The center was not added to the cache!')
+    }
+
+    commonBoundsCenter = Session.cache.center
+  } else {
+    commonBoundsCenter = Utils.getBoundsCenter(
+      Utils.getCommonBounds(initialShapes.map(TLDR.getBounds))
     )
-
-    const bounds = Utils.getCommonBounds(Object.values(shapesBounds))
-
-    return Utils.getBoundsCenter(bounds)
-  })
+    Session.cache.selectedIds = pageState.selectedIds
+    Session.cache.center = commonBoundsCenter
+  }
 
   return {
     commonBoundsCenter,

packages/tldraw/src/state/session/sessions/transform-single/transform-single.session.ts

@@ -47,6 +47,7 @@ export class TransformSingleSession extends Session {
     this.transformType = transformType
     this.snapshot = getTransformSingleSnapshot(data, transformType)
     this.isCreate = isCreate
+    Session.cache.selectedIds = [...this.snapshot.initialShape.id]
   }
 
   start = (data: Data) => {

packages/tldraw/src/state/session/sessions/transform/transform.session.ts

@@ -43,6 +43,7 @@ export class TransformSession extends Session {
     this.snapshot = getTransformSnapshot(data, transformType)
     this.isCreate = isCreate
     this.initialSelectedIds = TLDR.getSelectedIds(data, data.appState.currentPageId)
+    Session.cache.selectedIds = [...this.initialSelectedIds]
   }
 
   start = (data: Data) => {
@@ -59,8 +60,6 @@ export class TransformSession extends Session {
 
     const shapes = {} as Record<string, TLDrawShape>
 
-    const pageState = TLDR.getPageState(data, data.appState.currentPageId)
-
     const delta = Vec.sub(point, this.origin)
 
     let newBounds = Utils.getTransformedBoundingBox(

packages/tldraw/src/state/session/sessions/translate/translate.session.ts

@@ -12,7 +12,6 @@ import {
   GroupShape,
   SessionType,
   ArrowBinding,
-  TLDrawShapeType,
 } from '~types'
 import { SLOW_SPEED, SNAP_DISTANCE } from '~constants'
 import { TLDR } from '~state/tldr'
@@ -70,6 +69,7 @@ export class TranslateSession extends Session {
     this.snapshot = getTranslateSnapshot(data, isLinked)
     this.isCreate = isCreate
     this.isLinked = isLinked
+    Session.cache.selectedIds = [...TLDR.getSelectedIds(data, data.appState.currentPageId)]
   }
 
   start = (data: Data) => {
@@ -94,14 +94,7 @@ export class TranslateSession extends Session {
     }
   }
 
-  update = (
-    data: Data,
-    point: number[],
-    shiftKey = false,
-    altKey = false,
-    metaKey = false,
-    viewPort = {} as TLBounds
-  ) => {
+  update = (data: Data, point: number[], shiftKey = false, altKey = false, metaKey = false) => {
     const { selectedIds, initialParentChildren, initialShapes, bindingsToDelete } = this.snapshot
 
     const { currentPageId } = data.appState

packages/tldraw/src/state/tlstate.ts

@@ -347,6 +347,10 @@ export class TLDrawState extends StateManager<Data> {
       this.clearSelectHistory()
     }
 
+    if (id.startsWith('undo') || id.startsWith('redo')) {
+      Session.cache.selectedIds = [...this.selectedIds]
+    }
+
     this._onChange?.(this, state, id)
   }
 
@@ -1670,6 +1674,7 @@ export class TLDrawState extends StateManager<Data> {
     }
 
     const Session = getSession(type)
+
     // eslint-disable-next-line @typescript-eslint/ban-ts-comment
     // @ts-ignore
     this.session = new Session(this.state, this.viewport, ...args)

packages/tldraw/src/types.ts

@@ -155,6 +155,14 @@ export abstract class Session {
   updateViewport = (viewport: TLBounds) => {
     this.viewport = viewport
   }
+
+  static cache: {
+    selectedIds: string[]
+    center: number[]
+  } = {
+    selectedIds: [],
+    center: [0, 0],
+  }
 }
 
 export enum TLDrawStatus {

packages/vec/scripts/dev.js

@@ -11,10 +11,7 @@ async function main() {
     bundle: true,
     format: 'cjs',
     target: 'es6',
-    jsxFactory: 'React.createElement',
-    jsxFragment: 'React.Fragment',
     tsconfig: './tsconfig.json',
-    external: ['react', 'react-dom'],
     incremental: true,
     watch: {
       onRebuild(error) {

tsconfig.base.json

@@ -11,6 +11,7 @@
     "forceConsistentCasingInFileNames": true,
     "importHelpers": true,
     "importsNotUsedAsValues": "error",
+    "resolveJsonModule": true,
     "incremental": true,
     "jsx": "preserve",
     "lib": ["dom", "esnext"],

yarn.lock

@@ -3722,10 +3722,10 @@
     "@babel/runtime" "^7.12.5"
     "@testing-library/dom" "^8.0.0"
 
-"@tldraw/core@^0.1.9":
-  version "0.1.9"
-  resolved "https://registry.yarnpkg.com/@tldraw/core/-/core-0.1.9.tgz#006748ee0c395ef15756ee1aa3c93b7eef109432"
-  integrity sha512-3vzFceettMZVkVM+ASaAFyFy2YibwnEkIcIiWTmKER+5R0HIEKnwDuH+zXiv+C1dcbagUvArHRw0AiuzA5ft8g==
+"@tldraw/core@^0.1.10":
+  version "0.1.10"
+  resolved "https://registry.yarnpkg.com/@tldraw/core/-/core-0.1.10.tgz#fe6aa880b619361473ebccb5c932082efb535518"
+  integrity sha512-kLqCDQHRykWfskMvcbSn3Ll8Ssd46hMmMdTpqw1O3i3AV2zuWDYkdgGD3PO6PRSkkMZyGNr5/zpkU+Yrk5DYZQ==
   dependencies:
     "@use-gesture/react" "^10.0.2"