Fix spawn floorplan move handle

packages/nodes/src/spawn/__tests__/parity.test.ts

@@ -31,6 +31,7 @@ describe('spawn definition', () => {
     expect(spawnDefinition.schemaVersion).toBe(1)
     expect(spawnDefinition.category).toBe('site')
     expect(spawnDefinition.schema).toBe(SpawnNode)
+    expect(typeof spawnDefinition.floorplanMoveTarget).toBe('function')
   })
 
   test('defaults() returns a value that the schema accepts', () => {
@@ -111,6 +112,7 @@ describe('spawn definition', () => {
 
     const flat = flattenFloorplan(geometry)
     expect(flat.some((entry) => entry.kind === 'path' && entry.stroke === '#818cf8')).toBe(true)
+    expect(flat.some((entry) => entry.kind === 'move-handle')).toBe(true)
     expect(flat.some((entry) => entry.kind === 'rotate-arrow')).toBe(true)
   })
 

packages/nodes/src/spawn/definition.ts

@@ -1,6 +1,7 @@
 import type { HandleDescriptor, NodeDefinition, SpawnNode as SpawnNodeType } from '@pascal-app/core'
 import { buildSpawnFloorplan } from './floorplan'
 import { spawnRotateAffordance } from './floorplan-affordances'
+import { spawnFloorplanMoveTarget } from './floorplan-move'
 import { spawnParametrics } from './parametrics'
 import { SpawnNode } from './schema'
 
@@ -92,6 +93,7 @@ export const spawnDefinition: NodeDefinition<typeof SpawnNode> = {
   // delete. Legacy spawn click handlers in FloorplanNodeLayer become
   // dead code once Phase 6 cleanup removes the [] entries path.
   floorplan: buildSpawnFloorplan,
+  floorplanMoveTarget: spawnFloorplanMoveTarget,
   floorplanAffordances: {
     'spawn-rotate': spawnRotateAffordance,
   },

packages/nodes/src/spawn/floorplan-move.ts

@@ -0,0 +1,39 @@
+import {
+  type AnyNodeId,
+  type FloorplanMoveTarget,
+  type FloorplanMoveTargetSession,
+  type SpawnNode,
+  snapScalar,
+  useScene,
+} from '@pascal-app/core'
+import { getSegmentGridStep } from '@pascal-app/editor'
+
+export const spawnFloorplanMoveTarget: FloorplanMoveTarget<SpawnNode> = ({ node }) => {
+  const spawnId = node.id as AnyNodeId
+  const startY = node.position[1]
+  const originalPosition: [number, number, number] = [...node.position]
+  let lastPosition: [number, number, number] | null = null
+
+  const session: FloorplanMoveTargetSession = {
+    affectedIds: [spawnId],
+    apply({ planPoint, modifiers }) {
+      const step = getSegmentGridStep()
+      const snap = (value: number) => (modifiers.shiftKey ? value : snapScalar(value, step))
+      const next: [number, number, number] = [snap(planPoint[0]), startY, snap(planPoint[1])]
+
+      if (lastPosition && lastPosition[0] === next[0] && lastPosition[2] === next[2]) return
+      lastPosition = next
+      useScene.getState().updateNodes([{ id: spawnId, data: { position: next } }])
+    },
+    canCommit() {
+      if (!lastPosition) return false
+      return lastPosition[0] !== originalPosition[0] || lastPosition[2] !== originalPosition[2]
+    },
+    commit() {
+      if (!lastPosition) return
+      useScene.getState().updateNodes([{ id: spawnId, data: { position: lastPosition } }])
+    },
+  }
+
+  return session
+}

packages/nodes/src/spawn/floorplan.ts

@@ -113,6 +113,11 @@ export function buildSpawnFloorplan(node: SpawnNode, ctx: GeometryContext): Floo
   ]
 
   if (isSelected) {
+    children.push({
+      kind: 'move-handle',
+      point: [px, pz],
+    })
+
     const cornerLocalX = 0.34 + ROTATE_ARROW_CORNER_OFFSET
     const cornerLocalZ = 0.34 + ROTATE_ARROW_CORNER_OFFSET
     const [cornerX, cornerZ] = rotatePlanVector(cornerLocalX, cornerLocalZ, planRotation)