{
  "version": 3,
  "sources": ["../../../../../src/lib/editor/managers/SnapManager/BoundsSnaps.ts"],
  "sourcesContent": ["import { computed } from '@tldraw/state'\nimport { TLShape, TLShapeId, VecModel } from '@tldraw/tlschema'\nimport { assertExists, dedupe, uniqueId } from '@tldraw/utils'\nimport {\n\tBox,\n\tSelectionCorner,\n\tSelectionEdge,\n\tflipSelectionHandleX,\n\tflipSelectionHandleY,\n\tisSelectionCorner,\n} from '../../../primitives/Box'\nimport { Mat } from '../../../primitives/Mat'\nimport { Vec } from '../../../primitives/Vec'\nimport { rangeIntersection, rangesOverlap } from '../../../primitives/utils'\nimport type { Editor } from '../../Editor'\nimport type {\n\tGapsSnapIndicator,\n\tPointsSnapIndicator,\n\tSnapData,\n\tSnapIndicator,\n\tSnapManager,\n} from './SnapManager'\n\n/**\n * When moving or resizing shapes, the bounds of the shape can snap to key geometry on other nearby\n * shapes. Customize how a shape snaps to others with {@link ShapeUtil.getBoundsSnapGeometry}.\n *\n * @public\n */\nexport interface BoundsSnapGeometry {\n\t/**\n\t * Points that this shape will snap to. By default, this will be the corners and center of the\n\t * shapes bounding box. To disable snapping to a specific point, use an empty array.\n\t */\n\tpoints?: VecModel[]\n}\n\n/** @public */\nexport interface BoundsSnapPoint {\n\tid: string\n\tx: number\n\ty: number\n\thandle?: SelectionCorner\n}\n\ninterface SnapPair {\n\tthisPoint: BoundsSnapPoint\n\totherPoint: BoundsSnapPoint\n}\n\ninterface NearestPointsSnap {\n\t// selection snaps to a nearby snap point\n\ttype: 'points'\n\tpoints: SnapPair\n\tnudge: number\n}\n\ntype NearestSnap =\n\t| NearestPointsSnap\n\t| {\n\t\t\t// selection snaps to the center of a gap\n\t\t\ttype: 'gap_center'\n\t\t\tgap: Gap\n\t\t\tnudge: number\n\t  }\n\t| {\n\t\t\t// selection snaps to create a new gap of equal size to another gap\n\t\t\t// on the opposite side of some shape\n\t\t\ttype: 'gap_duplicate'\n\t\t\tgap: Gap\n\t\t\tprotrusionDirection: 'left' | 'right' | 'top' | 'bottom'\n\t\t\tnudge: number\n\t  }\n\ninterface GapNode {\n\tid: TLShapeId\n\tpageBounds: Box\n}\n\ninterface Gap {\n\t// e.g.\n\t//      start\n\t//      edge     \u2502         breadth\n\t//               \u2502       intersection\n\t//               \u25BC        [40,100]           end\n\t//                            \u2502            \u2502 edge\n\t// \u250C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502 100,0      \u2502            \u2502\n\t// \u2502           \u2502 \u2502            \u25BC            \u25BC\n\t// \u2502           \u2502 \u2502\n\t// \u2502  start    \u2502 \u2502            \u2502     200,40 \u2502 \u250C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\t// \u2502  node     \u2502 \u2502            \u2502            \u2502 \u2502           \u2502\n\t// \u2502           \u2502 \u251C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524 \u2502  end      \u2502\n\t// \u2502           \u2502 \u2502            \u2502            \u2502 \u2502  node     \u2502\n\t// \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2502 100,100    \u2502            \u2502 \u2502           \u2502\n\t//                                         \u2502 \u2502           \u2502\n\t//                                 200,120 \u2502 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\t//\n\t//                       length 100\n\t//               \u25C4\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25BA\n\tstartNode: GapNode\n\tendNode: GapNode\n\tstartEdge: [Vec, Vec]\n\tendEdge: [Vec, Vec]\n\tlength: number\n\tbreadthIntersection: [number, number]\n}\n\nconst round = (x: number) => {\n\t// round numbers to avoid glitches for floating point rounding errors\n\tconst decimalPlacesTolerance = 8\n\treturn Math.round(x * 10 ** decimalPlacesTolerance) / 10 ** decimalPlacesTolerance\n}\n\nfunction findAdjacentGaps(\n\tgaps: Gap[],\n\tshapeId: TLShapeId,\n\tgapLength: number,\n\tdirection: 'forward' | 'backward',\n\tintersection: [number, number]\n): Gap[] {\n\t// TODO: take advantage of the fact that gaps is sorted by starting position?\n\tconst matches = gaps.filter(\n\t\t(gap) =>\n\t\t\t(direction === 'forward' ? gap.startNode.id === shapeId : gap.endNode.id === shapeId) &&\n\t\t\tround(gap.length) === round(gapLength) &&\n\t\t\trangeIntersection(\n\t\t\t\tgap.breadthIntersection[0],\n\t\t\t\tgap.breadthIntersection[1],\n\t\t\t\tintersection[0],\n\t\t\t\tintersection[1]\n\t\t\t)\n\t)\n\n\tif (matches.length === 0) return []\n\n\tconst nextNodes = new Set<TLShapeId>()\n\n\tmatches.forEach((match) => {\n\t\tconst node = direction === 'forward' ? match.endNode.id : match.startNode.id\n\t\tif (!nextNodes.has(node)) {\n\t\t\tnextNodes.add(node)\n\t\t\tconst foundGaps = findAdjacentGaps(\n\t\t\t\tgaps,\n\t\t\t\tnode,\n\t\t\t\tgapLength,\n\t\t\t\tdirection,\n\t\t\t\trangeIntersection(\n\t\t\t\t\tmatch.breadthIntersection[0],\n\t\t\t\t\tmatch.breadthIntersection[1],\n\t\t\t\t\tintersection[0],\n\t\t\t\t\tintersection[1]\n\t\t\t\t)!\n\t\t\t)\n\n\t\t\tmatches.push(...foundGaps)\n\t\t}\n\t})\n\n\treturn matches\n}\n\nfunction dedupeGapSnaps(snaps: Array<Extract<SnapIndicator, { type: 'gaps' }>>) {\n\t// sort by descending order of number of gaps\n\tsnaps.sort((a, b) => b.gaps.length - a.gaps.length)\n\t// pop off any that are included already\n\tfor (let i = snaps.length - 1; i > 0; i--) {\n\t\tconst snap = snaps[i]\n\t\tfor (let j = i - 1; j >= 0; j--) {\n\t\t\tconst otherSnap = snaps[j]\n\t\t\t// if every edge in this snap is included in the other snap somewhere, then it's redundant\n\t\t\tif (\n\t\t\t\totherSnap.direction === snap.direction &&\n\t\t\t\tsnap.gaps.every(\n\t\t\t\t\t(gap) =>\n\t\t\t\t\t\totherSnap.gaps.some(\n\t\t\t\t\t\t\t(otherGap) =>\n\t\t\t\t\t\t\t\tround(gap.startEdge[0].x) === round(otherGap.startEdge[0].x) &&\n\t\t\t\t\t\t\t\tround(gap.startEdge[0].y) === round(otherGap.startEdge[0].y) &&\n\t\t\t\t\t\t\t\tround(gap.startEdge[1].x) === round(otherGap.startEdge[1].x) &&\n\t\t\t\t\t\t\t\tround(gap.startEdge[1].y) === round(otherGap.startEdge[1].y)\n\t\t\t\t\t\t) &&\n\t\t\t\t\t\totherSnap.gaps.some(\n\t\t\t\t\t\t\t(otherGap) =>\n\t\t\t\t\t\t\t\tround(gap.endEdge[0].x) === round(otherGap.endEdge[0].x) &&\n\t\t\t\t\t\t\t\tround(gap.endEdge[0].y) === round(otherGap.endEdge[0].y) &&\n\t\t\t\t\t\t\t\tround(gap.endEdge[1].x) === round(otherGap.endEdge[1].x) &&\n\t\t\t\t\t\t\t\tround(gap.endEdge[1].y) === round(otherGap.endEdge[1].y)\n\t\t\t\t\t\t)\n\t\t\t\t)\n\t\t\t) {\n\t\t\t\tsnaps.splice(i, 1)\n\t\t\t\tbreak\n\t\t\t}\n\t\t}\n\t}\n}\n\n/** @public */\nexport class BoundsSnaps {\n\treadonly editor: Editor\n\tconstructor(readonly manager: SnapManager) {\n\t\tthis.editor = manager.editor\n\t}\n\n\t@computed private getSnapPointsCache() {\n\t\tconst { editor } = this\n\t\treturn editor.store.createComputedCache<BoundsSnapPoint[], TLShape>('snapPoints', (shape) => {\n\t\t\tconst pageTransform = editor.getShapePageTransform(shape.id)\n\t\t\tif (!pageTransform) return undefined\n\t\t\tconst boundsSnapGeometry = editor.getShapeUtil(shape).getBoundsSnapGeometry(shape)\n\t\t\tconst snapPoints =\n\t\t\t\tboundsSnapGeometry.points ?? editor.getShapeGeometry(shape).bounds.cornersAndCenter\n\n\t\t\tif (!pageTransform || !snapPoints) return undefined\n\t\t\treturn snapPoints.map((point, i) => {\n\t\t\t\tconst { x, y } = Mat.applyToPoint(pageTransform, point)\n\t\t\t\treturn { x, y, id: `${shape.id}:${i}` }\n\t\t\t})\n\t\t})\n\t}\n\n\tgetSnapPoints(shapeId: TLShapeId) {\n\t\treturn this.getSnapPointsCache().get(shapeId) ?? []\n\t}\n\n\t// Points which belong to snappable shapes\n\t@computed private getSnappablePoints() {\n\t\tconst snapPointsCache = this.getSnapPointsCache()\n\t\tconst snappableShapes = this.manager.getSnappableShapes()\n\t\tconst result: BoundsSnapPoint[] = []\n\n\t\tfor (const shapeId of snappableShapes) {\n\t\t\tconst snapPoints = snapPointsCache.get(shapeId)\n\t\t\tif (snapPoints) {\n\t\t\t\tresult.push(...snapPoints)\n\t\t\t}\n\t\t}\n\n\t\treturn result\n\t}\n\n\t@computed private getSnappableGapNodes(): Array<GapNode> {\n\t\treturn Array.from(this.manager.getSnappableShapes(), (shapeId) => ({\n\t\t\tid: shapeId,\n\t\t\tpageBounds: assertExists(this.editor.getShapePageBounds(shapeId)),\n\t\t}))\n\t}\n\n\t@computed private getVisibleGaps(): { horizontal: Gap[]; vertical: Gap[] } {\n\t\tconst horizontal: Gap[] = []\n\t\tconst vertical: Gap[] = []\n\n\t\tlet startNode: GapNode, endNode: GapNode\n\n\t\tconst sortedShapesOnCurrentPageHorizontal = this.getSnappableGapNodes().sort((a, b) => {\n\t\t\treturn a.pageBounds.minX - b.pageBounds.minX\n\t\t})\n\n\t\t// Collect horizontal gaps\n\t\tfor (let i = 0; i < sortedShapesOnCurrentPageHorizontal.length; i++) {\n\t\t\tstartNode = sortedShapesOnCurrentPageHorizontal[i]\n\t\t\tfor (let j = i + 1; j < sortedShapesOnCurrentPageHorizontal.length; j++) {\n\t\t\t\tendNode = sortedShapesOnCurrentPageHorizontal[j]\n\n\t\t\t\tif (\n\t\t\t\t\t// is there space between the boxes\n\t\t\t\t\tstartNode.pageBounds.maxX < endNode.pageBounds.minX &&\n\t\t\t\t\t// and they overlap in the y axis\n\t\t\t\t\trangesOverlap(\n\t\t\t\t\t\tstartNode.pageBounds.minY,\n\t\t\t\t\t\tstartNode.pageBounds.maxY,\n\t\t\t\t\t\tendNode.pageBounds.minY,\n\t\t\t\t\t\tendNode.pageBounds.maxY\n\t\t\t\t\t)\n\t\t\t\t) {\n\t\t\t\t\thorizontal.push({\n\t\t\t\t\t\tstartNode,\n\t\t\t\t\t\tendNode,\n\t\t\t\t\t\tstartEdge: [\n\t\t\t\t\t\t\tnew Vec(startNode.pageBounds.maxX, startNode.pageBounds.minY),\n\t\t\t\t\t\t\tnew Vec(startNode.pageBounds.maxX, startNode.pageBounds.maxY),\n\t\t\t\t\t\t],\n\t\t\t\t\t\tendEdge: [\n\t\t\t\t\t\t\tnew Vec(endNode.pageBounds.minX, endNode.pageBounds.minY),\n\t\t\t\t\t\t\tnew Vec(endNode.pageBounds.minX, endNode.pageBounds.maxY),\n\t\t\t\t\t\t],\n\t\t\t\t\t\tlength: endNode.pageBounds.minX - startNode.pageBounds.maxX,\n\t\t\t\t\t\tbreadthIntersection: rangeIntersection(\n\t\t\t\t\t\t\tstartNode.pageBounds.minY,\n\t\t\t\t\t\t\tstartNode.pageBounds.maxY,\n\t\t\t\t\t\t\tendNode.pageBounds.minY,\n\t\t\t\t\t\t\tendNode.pageBounds.maxY\n\t\t\t\t\t\t)!,\n\t\t\t\t\t})\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Collect vertical gaps\n\t\tconst sortedShapesOnCurrentPageVertical = sortedShapesOnCurrentPageHorizontal.sort((a, b) => {\n\t\t\treturn a.pageBounds.minY - b.pageBounds.minY\n\t\t})\n\n\t\tfor (let i = 0; i < sortedShapesOnCurrentPageVertical.length; i++) {\n\t\t\tstartNode = sortedShapesOnCurrentPageVertical[i]\n\t\t\tfor (let j = i + 1; j < sortedShapesOnCurrentPageVertical.length; j++) {\n\t\t\t\tendNode = sortedShapesOnCurrentPageVertical[j]\n\n\t\t\t\tif (\n\t\t\t\t\t// is there space between the boxes\n\t\t\t\t\tstartNode.pageBounds.maxY < endNode.pageBounds.minY &&\n\t\t\t\t\t// do they overlap in the x axis\n\t\t\t\t\trangesOverlap(\n\t\t\t\t\t\tstartNode.pageBounds.minX,\n\t\t\t\t\t\tstartNode.pageBounds.maxX,\n\t\t\t\t\t\tendNode.pageBounds.minX,\n\t\t\t\t\t\tendNode.pageBounds.maxX\n\t\t\t\t\t)\n\t\t\t\t) {\n\t\t\t\t\tvertical.push({\n\t\t\t\t\t\tstartNode,\n\t\t\t\t\t\tendNode,\n\t\t\t\t\t\tstartEdge: [\n\t\t\t\t\t\t\tnew Vec(startNode.pageBounds.minX, startNode.pageBounds.maxY),\n\t\t\t\t\t\t\tnew Vec(startNode.pageBounds.maxX, startNode.pageBounds.maxY),\n\t\t\t\t\t\t],\n\t\t\t\t\t\tendEdge: [\n\t\t\t\t\t\t\tnew Vec(endNode.pageBounds.minX, endNode.pageBounds.minY),\n\t\t\t\t\t\t\tnew Vec(endNode.pageBounds.maxX, endNode.pageBounds.minY),\n\t\t\t\t\t\t],\n\t\t\t\t\t\tlength: endNode.pageBounds.minY - startNode.pageBounds.maxY,\n\t\t\t\t\t\tbreadthIntersection: rangeIntersection(\n\t\t\t\t\t\t\tstartNode.pageBounds.minX,\n\t\t\t\t\t\t\tstartNode.pageBounds.maxX,\n\t\t\t\t\t\t\tendNode.pageBounds.minX,\n\t\t\t\t\t\t\tendNode.pageBounds.maxX\n\t\t\t\t\t\t)!,\n\t\t\t\t\t})\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn { horizontal, vertical }\n\t}\n\n\tsnapTranslateShapes({\n\t\tlockedAxis,\n\t\tinitialSelectionPageBounds,\n\t\tinitialSelectionSnapPoints,\n\t\tdragDelta,\n\t}: {\n\t\tlockedAxis: 'x' | 'y' | null\n\t\tinitialSelectionSnapPoints: BoundsSnapPoint[]\n\t\tinitialSelectionPageBounds: Box\n\t\tdragDelta: Vec\n\t}): SnapData {\n\t\tconst snapThreshold = this.manager.getSnapThreshold()\n\t\tconst visibleSnapPointsNotInSelection = this.getSnappablePoints()\n\n\t\tconst selectionPageBounds = initialSelectionPageBounds.clone().translate(dragDelta)\n\n\t\tconst selectionSnapPoints: BoundsSnapPoint[] = initialSelectionSnapPoints.map(\n\t\t\t({ x, y }, i) => ({\n\t\t\t\tid: 'selection:' + i,\n\t\t\t\tx: x + dragDelta.x,\n\t\t\t\ty: y + dragDelta.y,\n\t\t\t})\n\t\t)\n\n\t\tconst otherNodeSnapPoints = visibleSnapPointsNotInSelection\n\n\t\tconst nearestSnapsX: NearestSnap[] = []\n\t\tconst nearestSnapsY: NearestSnap[] = []\n\t\tconst minOffset = new Vec(snapThreshold, snapThreshold)\n\n\t\tthis.collectPointSnaps({\n\t\t\tminOffset,\n\t\t\tnearestSnapsX,\n\t\t\tnearestSnapsY,\n\t\t\totherNodeSnapPoints,\n\t\t\tselectionSnapPoints,\n\t\t})\n\n\t\tthis.collectGapSnaps({\n\t\t\tselectionPageBounds,\n\t\t\tnearestSnapsX,\n\t\t\tnearestSnapsY,\n\t\t\tminOffset,\n\t\t})\n\n\t\t// at the same time, calculate how far we need to nudge the shape to 'snap' to the target point(s)\n\t\tconst nudge = new Vec(\n\t\t\tlockedAxis === 'x' ? 0 : (nearestSnapsX[0]?.nudge ?? 0),\n\t\t\tlockedAxis === 'y' ? 0 : (nearestSnapsY[0]?.nudge ?? 0)\n\t\t)\n\n\t\t// ok we've figured out how much the box should be nudged, now let's find all the snap points\n\t\t// that are exact after making that translation, so we can render all of them.\n\t\t// first reset everything and adjust the original shapes to conform to the nudge\n\t\tminOffset.x = 0\n\t\tminOffset.y = 0\n\t\tnearestSnapsX.length = 0\n\t\tnearestSnapsY.length = 0\n\t\tselectionSnapPoints.forEach((s) => {\n\t\t\ts.x += nudge.x\n\t\t\ts.y += nudge.y\n\t\t})\n\t\tselectionPageBounds.translate(nudge)\n\n\t\tthis.collectPointSnaps({\n\t\t\tminOffset,\n\t\t\tnearestSnapsX,\n\t\t\tnearestSnapsY,\n\t\t\totherNodeSnapPoints,\n\t\t\tselectionSnapPoints,\n\t\t})\n\n\t\tthis.collectGapSnaps({\n\t\t\tselectionPageBounds,\n\t\t\tnearestSnapsX,\n\t\t\tnearestSnapsY,\n\t\t\tminOffset,\n\t\t})\n\n\t\tconst pointSnapsLines = this.getPointSnapLines({\n\t\t\tnearestSnapsX,\n\t\t\tnearestSnapsY,\n\t\t})\n\n\t\tconst gapSnapLines = this.getGapSnapLines({\n\t\t\tselectionPageBounds,\n\t\t\tnearestSnapsX,\n\t\t\tnearestSnapsY,\n\t\t})\n\n\t\tthis.manager.setIndicators([...gapSnapLines, ...pointSnapsLines])\n\n\t\treturn { nudge }\n\t}\n\n\tsnapResizeShapes({\n\t\tinitialSelectionPageBounds,\n\t\tdragDelta,\n\t\thandle: originalHandle,\n\t\tisAspectRatioLocked,\n\t\tisResizingFromCenter,\n\t}: {\n\t\t// the page bounds when the pointer went down, before any dragging\n\t\tinitialSelectionPageBounds: Box\n\t\t// how far the pointer has been dragged\n\t\tdragDelta: Vec\n\n\t\thandle: SelectionCorner | SelectionEdge\n\t\tisAspectRatioLocked: boolean\n\t\tisResizingFromCenter: boolean\n\t}): SnapData {\n\t\tconst snapThreshold = this.manager.getSnapThreshold()\n\n\t\t// first figure out the new bounds of the selection\n\t\tconst {\n\t\t\tbox: unsnappedResizedPageBounds,\n\t\t\tscaleX,\n\t\t\tscaleY,\n\t\t} = Box.Resize(\n\t\t\tinitialSelectionPageBounds,\n\t\t\toriginalHandle,\n\t\t\tisResizingFromCenter ? dragDelta.x * 2 : dragDelta.x,\n\t\t\tisResizingFromCenter ? dragDelta.y * 2 : dragDelta.y,\n\t\t\tisAspectRatioLocked\n\t\t)\n\n\t\tlet handle = originalHandle\n\n\t\tif (scaleX < 0) {\n\t\t\thandle = flipSelectionHandleX(handle)\n\t\t}\n\t\tif (scaleY < 0) {\n\t\t\thandle = flipSelectionHandleY(handle)\n\t\t}\n\n\t\tif (isResizingFromCenter) {\n\t\t\t// reposition if resizing from center\n\t\t\tunsnappedResizedPageBounds.center = initialSelectionPageBounds.center\n\t\t}\n\n\t\tconst isXLocked = handle === 'top' || handle === 'bottom'\n\t\tconst isYLocked = handle === 'left' || handle === 'right'\n\n\t\tconst selectionSnapPoints = getResizeSnapPointsForHandle(handle, unsnappedResizedPageBounds)\n\n\t\tconst otherNodeSnapPoints = this.getSnappablePoints()\n\n\t\tconst nearestSnapsX: NearestPointsSnap[] = []\n\t\tconst nearestSnapsY: NearestPointsSnap[] = []\n\t\tconst minOffset = new Vec(snapThreshold, snapThreshold)\n\n\t\tthis.collectPointSnaps({\n\t\t\tminOffset,\n\t\t\tnearestSnapsX,\n\t\t\tnearestSnapsY,\n\t\t\totherNodeSnapPoints,\n\t\t\tselectionSnapPoints,\n\t\t})\n\n\t\t// at the same time, calculate how far we need to nudge the shape to 'snap' to the target point(s)\n\t\tconst nudge = new Vec(\n\t\t\tisXLocked ? 0 : (nearestSnapsX[0]?.nudge ?? 0),\n\t\t\tisYLocked ? 0 : (nearestSnapsY[0]?.nudge ?? 0)\n\t\t)\n\n\t\tif (isAspectRatioLocked && isSelectionCorner(handle) && nudge.len() !== 0) {\n\t\t\t// if the aspect ratio is locked we need to make the nudge diagonal rather than independent in each axis\n\t\t\t// so we use the aspect ratio along with one axis value to set the other axis value, but which axis we use\n\t\t\t// as a source of truth depends what we have snapped to and how far.\n\n\t\t\t// if we found a snap in both axes, pick the closest one and discard the other\n\t\t\tconst primaryNudgeAxis: 'x' | 'y' =\n\t\t\t\tnearestSnapsX.length && nearestSnapsY.length\n\t\t\t\t\t? Math.abs(nudge.x) < Math.abs(nudge.y)\n\t\t\t\t\t\t? 'x'\n\t\t\t\t\t\t: 'y'\n\t\t\t\t\t: nearestSnapsX.length\n\t\t\t\t\t\t? 'x'\n\t\t\t\t\t\t: 'y'\n\n\t\t\tconst ratio = initialSelectionPageBounds.aspectRatio\n\n\t\t\tif (primaryNudgeAxis === 'x') {\n\t\t\t\tnearestSnapsY.length = 0\n\t\t\t\tnudge.y = nudge.x / ratio\n\t\t\t\tif (handle === 'bottom_left' || handle === 'top_right') {\n\t\t\t\t\tnudge.y = -nudge.y\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tnearestSnapsX.length = 0\n\t\t\t\tnudge.x = nudge.y * ratio\n\t\t\t\tif (handle === 'bottom_left' || handle === 'top_right') {\n\t\t\t\t\tnudge.x = -nudge.x\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// now resize the box after nudging, calculate the snaps again, and return the snap lines to match\n\t\t// the fully resized box\n\t\tconst snappedDelta = Vec.Add(dragDelta, nudge)\n\n\t\t// first figure out the new bounds of the selection\n\t\tconst { box: snappedResizedPageBounds } = Box.Resize(\n\t\t\tinitialSelectionPageBounds,\n\t\t\toriginalHandle,\n\t\t\tisResizingFromCenter ? snappedDelta.x * 2 : snappedDelta.x,\n\t\t\tisResizingFromCenter ? snappedDelta.y * 2 : snappedDelta.y,\n\t\t\tisAspectRatioLocked\n\t\t)\n\n\t\tif (isResizingFromCenter) {\n\t\t\t// reposition if resizing from center\n\t\t\tsnappedResizedPageBounds.center = initialSelectionPageBounds.center\n\t\t}\n\n\t\tconst snappedSelectionPoints = getResizeSnapPointsForHandle('any', snappedResizedPageBounds)\n\t\t// calculate snaps again using all points\n\t\tnearestSnapsX.length = 0\n\t\tnearestSnapsY.length = 0\n\t\tminOffset.x = 0\n\t\tminOffset.y = 0\n\n\t\tthis.collectPointSnaps({\n\t\t\tminOffset,\n\t\t\tnearestSnapsX,\n\t\t\tnearestSnapsY,\n\t\t\totherNodeSnapPoints,\n\t\t\tselectionSnapPoints: snappedSelectionPoints,\n\t\t})\n\t\tconst pointSnaps = this.getPointSnapLines({\n\t\t\tnearestSnapsX,\n\t\t\tnearestSnapsY,\n\t\t})\n\n\t\tthis.manager.setIndicators([...pointSnaps])\n\n\t\treturn { nudge }\n\t}\n\n\tprivate collectPointSnaps({\n\t\tselectionSnapPoints,\n\t\totherNodeSnapPoints,\n\t\tminOffset,\n\t\tnearestSnapsX,\n\t\tnearestSnapsY,\n\t}: {\n\t\tselectionSnapPoints: BoundsSnapPoint[]\n\t\totherNodeSnapPoints: BoundsSnapPoint[]\n\t\tminOffset: Vec\n\t\tnearestSnapsX: NearestSnap[]\n\t\tnearestSnapsY: NearestSnap[]\n\t}) {\n\t\t// for each snap point on the bounding box of the selection, find the set of points\n\t\t// which are closest to it in each axis\n\t\tfor (const thisSnapPoint of selectionSnapPoints) {\n\t\t\tfor (const otherSnapPoint of otherNodeSnapPoints) {\n\t\t\t\tconst offset = Vec.Sub(thisSnapPoint, otherSnapPoint)\n\t\t\t\tconst offsetX = Math.abs(offset.x)\n\t\t\t\tconst offsetY = Math.abs(offset.y)\n\n\t\t\t\tif (round(offsetX) <= round(minOffset.x)) {\n\t\t\t\t\tif (round(offsetX) < round(minOffset.x)) {\n\t\t\t\t\t\t// we found a point that is significantly closer than all previous points\n\t\t\t\t\t\t// so wipe the slate clean and start over\n\t\t\t\t\t\tnearestSnapsX.length = 0\n\t\t\t\t\t}\n\n\t\t\t\t\tnearestSnapsX.push({\n\t\t\t\t\t\ttype: 'points',\n\t\t\t\t\t\tpoints: { thisPoint: thisSnapPoint, otherPoint: otherSnapPoint },\n\t\t\t\t\t\tnudge: otherSnapPoint.x - thisSnapPoint.x,\n\t\t\t\t\t})\n\t\t\t\t\tminOffset.x = offsetX\n\t\t\t\t}\n\n\t\t\t\tif (round(offsetY) <= round(minOffset.y)) {\n\t\t\t\t\tif (round(offsetY) < round(minOffset.y)) {\n\t\t\t\t\t\t// we found a point that is significantly closer than all previous points\n\t\t\t\t\t\t// so wipe the slate clean and start over\n\t\t\t\t\t\tnearestSnapsY.length = 0\n\t\t\t\t\t}\n\t\t\t\t\tnearestSnapsY.push({\n\t\t\t\t\t\ttype: 'points',\n\t\t\t\t\t\tpoints: { thisPoint: thisSnapPoint, otherPoint: otherSnapPoint },\n\t\t\t\t\t\tnudge: otherSnapPoint.y - thisSnapPoint.y,\n\t\t\t\t\t})\n\t\t\t\t\tminOffset.y = offsetY\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate collectGapSnaps({\n\t\tselectionPageBounds,\n\t\tminOffset,\n\t\tnearestSnapsX,\n\t\tnearestSnapsY,\n\t}: {\n\t\tselectionPageBounds: Box\n\t\tminOffset: Vec\n\t\tnearestSnapsX: NearestSnap[]\n\t\tnearestSnapsY: NearestSnap[]\n\t}) {\n\t\tconst { horizontal, vertical } = this.getVisibleGaps()\n\n\t\tfor (const gap of horizontal) {\n\t\t\t// ignore this gap if the selection doesn't overlap with it in the y axis\n\t\t\tif (\n\t\t\t\t!rangesOverlap(\n\t\t\t\t\tgap.breadthIntersection[0],\n\t\t\t\t\tgap.breadthIntersection[1],\n\t\t\t\t\tselectionPageBounds.minY,\n\t\t\t\t\tselectionPageBounds.maxY\n\t\t\t\t)\n\t\t\t) {\n\t\t\t\tcontinue\n\t\t\t}\n\n\t\t\t// check for center match\n\t\t\tconst gapMidX = gap.startEdge[0].x + gap.length / 2\n\t\t\tconst centerNudge = gapMidX - selectionPageBounds.center.x\n\t\t\tconst gapIsLargerThanSelection = gap.length > selectionPageBounds.width\n\n\t\t\tif (gapIsLargerThanSelection && round(Math.abs(centerNudge)) <= round(minOffset.x)) {\n\t\t\t\tif (round(Math.abs(centerNudge)) < round(minOffset.x)) {\n\t\t\t\t\t// reset if we found a closer snap\n\t\t\t\t\tnearestSnapsX.length = 0\n\t\t\t\t}\n\t\t\t\tminOffset.x = Math.abs(centerNudge)\n\n\t\t\t\tconst snap: NearestSnap = {\n\t\t\t\t\ttype: 'gap_center',\n\t\t\t\t\tgap,\n\t\t\t\t\tnudge: centerNudge,\n\t\t\t\t}\n\n\t\t\t\t// we need to avoid creating visual noise with too many center snaps in situations\n\t\t\t\t// where there are lots of adjacent items with even spacing\n\t\t\t\t// so let's only show other center snaps where the gap's breadth does not overlap with this one\n\t\t\t\t// i.e.\n\t\t\t\t//                \u250C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\t\t\t\t//                \u2502               \u2502\n\t\t\t\t//                \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u252C\u2500\u2500\u2500\u2500\u252C\u2500\u2500\u2500\u2518\n\t\t\t\t//                       \u253C    \u2502\n\t\t\t\t//                 \u250C\u2500\u2500\u2500\u2500\u2500\u2534\u2510   \u2502\n\t\t\t\t//                 \u2502      \u2502   \u253C\n\t\t\t\t//                 \u2514\u2500\u2500\u2500\u2500\u2500\u252C\u2518   \u2502\n\t\t\t\t//                       \u253C    \u2502\n\t\t\t\t//                   \u250C\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\t\t\t\t//                   \u2502                \u2502  \u25C4\u2500\u2500\u2500\u2500  i'm dragging this one\n\t\t\t\t//                   \u2514\u2500\u2500\u2500\u252C\u2500\u2500\u2500\u2500\u252C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\t\t\t\t//            \u2500\u2500\u2500\u2500\u2500\u25BA     \u253C    \u2502\n\t\t\t\t//                 \u250C\u2500\u2500\u2500\u2500\u2500\u2534\u2510   \u2502                don't show these\n\t\t\t\t// show these      \u2502      \u2502   \u253C                larger gaps since\n\t\t\t\t// smaller         \u2514\u2500\u2500\u2500\u2500\u2500\u252C\u2518   \u2502 \u25C4\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 the smaller ones\n\t\t\t\t// gaps                  \u253C    \u2502                cover the same\n\t\t\t\t//              \u2500\u2500\u2500\u2500\u2500\u25BA  \u250C\u2534\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2510          information\n\t\t\t\t//                      \u2502           \u2502\n\t\t\t\t//                      \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\t\t\t\t//\n\t\t\t\t// but we want to show all of these ones since the gap breadths don't overlap\n\t\t\t\t//            \u250C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\t\t\t\t//            \u2502             \u2502\n\t\t\t\t// \u250C\u2500\u2500\u2500\u2500\u2510     \u2514\u2500\u2500\u2500\u252C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\t\t\t\t// \u2502    \u2502         \u2502\n\t\t\t\t// \u2514\u2500\u2500\u252C\u2500\u2518         \u253C\n\t\t\t\t//    \u253C           \u2502\n\t\t\t\t// \u250C\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2510\n\t\t\t\t// \u2502                \u2502 \u25C4\u2500\u2500\u2500\u2500\u2500 i'm dragging this one\n\t\t\t\t// \u2514\u2500\u2500\u252C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252C\u2500\u2518\n\t\t\t\t//    \u253C           \u2502\n\t\t\t\t// \u250C\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2510      \u253C\n\t\t\t\t// \u2502       \u2502      \u2502\n\t\t\t\t// \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518    \u250C\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\t\t\t\t//              \u2502         \u2502\n\t\t\t\t//              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\n\t\t\t\tconst otherCenterSnap = nearestSnapsX.find(({ type }) => type === 'gap_center') as\n\t\t\t\t\t| Extract<NearestSnap, { type: 'gap_center' }>\n\t\t\t\t\t| undefined\n\n\t\t\t\tconst gapBreadthsOverlap =\n\t\t\t\t\totherCenterSnap &&\n\t\t\t\t\trangeIntersection(\n\t\t\t\t\t\tgap.breadthIntersection[0],\n\t\t\t\t\t\tgap.breadthIntersection[1],\n\t\t\t\t\t\totherCenterSnap.gap.breadthIntersection[0],\n\t\t\t\t\t\totherCenterSnap.gap.breadthIntersection[1]\n\t\t\t\t\t)\n\n\t\t\t\t// if there is another center snap and it's bigger than this one, and it overlaps with this one, replace it\n\t\t\t\tif (otherCenterSnap && otherCenterSnap.gap.length > gap.length && gapBreadthsOverlap) {\n\t\t\t\t\tnearestSnapsX[nearestSnapsX.indexOf(otherCenterSnap)] = snap\n\t\t\t\t} else if (!otherCenterSnap || !gapBreadthsOverlap) {\n\t\t\t\t\tnearestSnapsX.push(snap)\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// check for duplication left match\n\t\t\tconst duplicationLeftX = gap.startNode.pageBounds.minX - gap.length\n\t\t\tconst selectionRightX = selectionPageBounds.maxX\n\n\t\t\tconst duplicationLeftNudge = duplicationLeftX - selectionRightX\n\t\t\tif (round(Math.abs(duplicationLeftNudge)) <= round(minOffset.x)) {\n\t\t\t\tif (round(Math.abs(duplicationLeftNudge)) < round(minOffset.x)) {\n\t\t\t\t\t// reset if we found a closer snap\n\t\t\t\t\tnearestSnapsX.length = 0\n\t\t\t\t}\n\t\t\t\tminOffset.x = Math.abs(duplicationLeftNudge)\n\n\t\t\t\tnearestSnapsX.push({\n\t\t\t\t\ttype: 'gap_duplicate',\n\t\t\t\t\tgap,\n\t\t\t\t\tprotrusionDirection: 'left',\n\t\t\t\t\tnudge: duplicationLeftNudge,\n\t\t\t\t})\n\t\t\t}\n\n\t\t\t// check for duplication right match\n\t\t\tconst duplicationRightX = gap.endNode.pageBounds.maxX + gap.length\n\t\t\tconst selectionLeftX = selectionPageBounds.minX\n\n\t\t\tconst duplicationRightNudge = duplicationRightX - selectionLeftX\n\t\t\tif (round(Math.abs(duplicationRightNudge)) <= round(minOffset.x)) {\n\t\t\t\tif (round(Math.abs(duplicationRightNudge)) < round(minOffset.x)) {\n\t\t\t\t\t// reset if we found a closer snap\n\t\t\t\t\tnearestSnapsX.length = 0\n\t\t\t\t}\n\t\t\t\tminOffset.x = Math.abs(duplicationRightNudge)\n\n\t\t\t\tnearestSnapsX.push({\n\t\t\t\t\ttype: 'gap_duplicate',\n\t\t\t\t\tgap,\n\t\t\t\t\tprotrusionDirection: 'right',\n\t\t\t\t\tnudge: duplicationRightNudge,\n\t\t\t\t})\n\t\t\t}\n\t\t}\n\n\t\tfor (const gap of vertical) {\n\t\t\t// ignore this gap if the selection doesn't overlap with it in the y axis\n\t\t\tif (\n\t\t\t\t!rangesOverlap(\n\t\t\t\t\tgap.breadthIntersection[0],\n\t\t\t\t\tgap.breadthIntersection[1],\n\t\t\t\t\tselectionPageBounds.minX,\n\t\t\t\t\tselectionPageBounds.maxX\n\t\t\t\t)\n\t\t\t) {\n\t\t\t\tcontinue\n\t\t\t}\n\n\t\t\t// check for center match\n\t\t\tconst gapMidY = gap.startEdge[0].y + gap.length / 2\n\t\t\tconst centerNudge = gapMidY - selectionPageBounds.center.y\n\n\t\t\tconst gapIsLargerThanSelection = gap.length > selectionPageBounds.height\n\n\t\t\tif (gapIsLargerThanSelection && round(Math.abs(centerNudge)) <= round(minOffset.y)) {\n\t\t\t\tif (round(Math.abs(centerNudge)) < round(minOffset.y)) {\n\t\t\t\t\t// reset if we found a closer snap\n\t\t\t\t\tnearestSnapsY.length = 0\n\t\t\t\t}\n\t\t\t\tminOffset.y = Math.abs(centerNudge)\n\n\t\t\t\tconst snap: NearestSnap = {\n\t\t\t\t\ttype: 'gap_center',\n\t\t\t\t\tgap,\n\t\t\t\t\tnudge: centerNudge,\n\t\t\t\t}\n\n\t\t\t\t// we need to avoid creating visual noise with too many center snaps in situations\n\t\t\t\t// where there are lots of adjacent items with even spacing\n\t\t\t\t// so let's only show other center snaps where the gap's breadth does not overlap with this one\n\t\t\t\t// i.e.\n\t\t\t\t//                \u250C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\t\t\t\t//                \u2502               \u2502\n\t\t\t\t//                \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u252C\u2500\u2500\u2500\u2500\u252C\u2500\u2500\u2500\u2518\n\t\t\t\t//                       \u253C    \u2502\n\t\t\t\t//                 \u250C\u2500\u2500\u2500\u2500\u2500\u2534\u2510   \u2502\n\t\t\t\t//                 \u2502      \u2502   \u253C\n\t\t\t\t//                 \u2514\u2500\u2500\u2500\u2500\u2500\u252C\u2518   \u2502\n\t\t\t\t//                       \u253C    \u2502\n\t\t\t\t//                   \u250C\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\t\t\t\t//                   \u2502                \u2502  \u25C4\u2500\u2500\u2500\u2500  i'm dragging this one\n\t\t\t\t//                   \u2514\u2500\u2500\u2500\u252C\u2500\u2500\u2500\u2500\u252C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\t\t\t\t//            \u2500\u2500\u2500\u2500\u2500\u25BA     \u253C    \u2502\n\t\t\t\t//                 \u250C\u2500\u2500\u2500\u2500\u2500\u2534\u2510   \u2502                don't show these\n\t\t\t\t// show these      \u2502      \u2502   \u253C                larger gaps since\n\t\t\t\t// smaller         \u2514\u2500\u2500\u2500\u2500\u2500\u252C\u2518   \u2502 \u25C4\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 the smaller ones\n\t\t\t\t// gaps                  \u253C    \u2502                cover the same\n\t\t\t\t//              \u2500\u2500\u2500\u2500\u2500\u25BA  \u250C\u2534\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2510          information\n\t\t\t\t//                      \u2502           \u2502\n\t\t\t\t//                      \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\t\t\t\t//\n\t\t\t\t// but we want to show all of these ones since the gap breadths don't overlap\n\t\t\t\t//            \u250C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\t\t\t\t//            \u2502             \u2502\n\t\t\t\t// \u250C\u2500\u2500\u2500\u2500\u2510     \u2514\u2500\u2500\u2500\u252C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\t\t\t\t// \u2502    \u2502         \u2502\n\t\t\t\t// \u2514\u2500\u2500\u252C\u2500\u2518         \u253C\n\t\t\t\t//    \u253C           \u2502\n\t\t\t\t// \u250C\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2510\n\t\t\t\t// \u2502                \u2502 \u25C4\u2500\u2500\u2500\u2500\u2500 i'm dragging this one\n\t\t\t\t// \u2514\u2500\u2500\u252C\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252C\u2500\u2518\n\t\t\t\t//    \u253C           \u2502\n\t\t\t\t// \u250C\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2510      \u253C\n\t\t\t\t// \u2502       \u2502      \u2502\n\t\t\t\t// \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518    \u250C\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\t\t\t\t//              \u2502         \u2502\n\t\t\t\t//              \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\n\t\t\t\tconst otherCenterSnap = nearestSnapsY.find(({ type }) => type === 'gap_center') as\n\t\t\t\t\t| Extract<NearestSnap, { type: 'gap_center' }>\n\t\t\t\t\t| undefined\n\n\t\t\t\tconst gapBreadthsOverlap =\n\t\t\t\t\totherCenterSnap &&\n\t\t\t\t\trangesOverlap(\n\t\t\t\t\t\totherCenterSnap.gap.breadthIntersection[0],\n\t\t\t\t\t\totherCenterSnap.gap.breadthIntersection[1],\n\t\t\t\t\t\tgap.breadthIntersection[0],\n\t\t\t\t\t\tgap.breadthIntersection[1]\n\t\t\t\t\t)\n\n\t\t\t\t// if there is another center snap and it's bigger than this one, and it overlaps with this one, replace it\n\t\t\t\tif (otherCenterSnap && otherCenterSnap.gap.length > gap.length && gapBreadthsOverlap) {\n\t\t\t\t\tnearestSnapsY[nearestSnapsY.indexOf(otherCenterSnap)] = snap\n\t\t\t\t} else if (!otherCenterSnap || !gapBreadthsOverlap) {\n\t\t\t\t\tnearestSnapsY.push(snap)\n\t\t\t\t}\n\t\t\t\tcontinue\n\t\t\t}\n\n\t\t\t// check for duplication top match\n\t\t\tconst duplicationTopY = gap.startNode.pageBounds.minY - gap.length\n\t\t\tconst selectionBottomY = selectionPageBounds.maxY\n\n\t\t\tconst duplicationTopNudge = duplicationTopY - selectionBottomY\n\t\t\tif (round(Math.abs(duplicationTopNudge)) <= round(minOffset.y)) {\n\t\t\t\tif (round(Math.abs(duplicationTopNudge)) < round(minOffset.y)) {\n\t\t\t\t\t// reset if we found a closer snap\n\t\t\t\t\tnearestSnapsY.length = 0\n\t\t\t\t}\n\t\t\t\tminOffset.y = Math.abs(duplicationTopNudge)\n\n\t\t\t\tnearestSnapsY.push({\n\t\t\t\t\ttype: 'gap_duplicate',\n\t\t\t\t\tgap,\n\t\t\t\t\tprotrusionDirection: 'top',\n\t\t\t\t\tnudge: duplicationTopNudge,\n\t\t\t\t})\n\t\t\t}\n\n\t\t\t// check for duplication bottom match\n\t\t\tconst duplicationBottomY = gap.endNode.pageBounds.maxY + gap.length\n\t\t\tconst selectionTopY = selectionPageBounds.minY\n\n\t\t\tconst duplicationBottomNudge = duplicationBottomY - selectionTopY\n\t\t\tif (round(Math.abs(duplicationBottomNudge)) <= round(minOffset.y)) {\n\t\t\t\tif (round(Math.abs(duplicationBottomNudge)) < round(minOffset.y)) {\n\t\t\t\t\t// reset if we found a closer snap\n\t\t\t\t\tnearestSnapsY.length = 0\n\t\t\t\t}\n\t\t\t\tminOffset.y = Math.abs(duplicationBottomNudge)\n\n\t\t\t\tnearestSnapsY.push({\n\t\t\t\t\ttype: 'gap_duplicate',\n\t\t\t\t\tgap,\n\t\t\t\t\tprotrusionDirection: 'bottom',\n\t\t\t\t\tnudge: duplicationBottomNudge,\n\t\t\t\t})\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate getPointSnapLines({\n\t\tnearestSnapsX,\n\t\tnearestSnapsY,\n\t}: {\n\t\tnearestSnapsX: NearestSnap[]\n\t\tnearestSnapsY: NearestSnap[]\n\t}): PointsSnapIndicator[] {\n\t\t// point snaps may align on multiple parallel lines so we need to split the pairs\n\t\t// into groups based on where they are in their their snap axes\n\t\tconst snapGroupsX = {} as { [key: string]: SnapPair[] }\n\t\tconst snapGroupsY = {} as { [key: string]: SnapPair[] }\n\n\t\tif (nearestSnapsX.length > 0) {\n\t\t\tfor (const snap of nearestSnapsX) {\n\t\t\t\tif (snap.type === 'points') {\n\t\t\t\t\tconst key = round(snap.points.otherPoint.x)\n\t\t\t\t\tif (!snapGroupsX[key]) {\n\t\t\t\t\t\tsnapGroupsX[key] = []\n\t\t\t\t\t}\n\t\t\t\t\tsnapGroupsX[key].push(snap.points)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif (nearestSnapsY.length > 0) {\n\t\t\tfor (const snap of nearestSnapsY) {\n\t\t\t\tif (snap.type === 'points') {\n\t\t\t\t\tconst key = round(snap.points.otherPoint.y)\n\t\t\t\t\tif (!snapGroupsY[key]) {\n\t\t\t\t\t\tsnapGroupsY[key] = []\n\t\t\t\t\t}\n\t\t\t\t\tsnapGroupsY[key].push(snap.points)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// and finally create all the snap lines for the UI to render\n\t\treturn Object.values(snapGroupsX)\n\t\t\t.concat(Object.values(snapGroupsY))\n\t\t\t.map((snapGroup) => ({\n\t\t\t\tid: uniqueId(),\n\t\t\t\ttype: 'points',\n\t\t\t\tpoints: dedupe(\n\t\t\t\t\tsnapGroup\n\t\t\t\t\t\t.map((snap) => Vec.From(snap.otherPoint))\n\t\t\t\t\t\t// be sure to nudge over the selection snap points\n\t\t\t\t\t\t.concat(snapGroup.map((snap) => Vec.From(snap.thisPoint))),\n\t\t\t\t\t(a: Vec, b: Vec) => a.equals(b)\n\t\t\t\t),\n\t\t\t}))\n\t}\n\n\tprivate getGapSnapLines({\n\t\tselectionPageBounds,\n\t\tnearestSnapsX,\n\t\tnearestSnapsY,\n\t}: {\n\t\tselectionPageBounds: Box\n\t\tnearestSnapsX: NearestSnap[]\n\t\tnearestSnapsY: NearestSnap[]\n\t}): GapsSnapIndicator[] {\n\t\tconst { vertical, horizontal } = this.getVisibleGaps()\n\n\t\tconst selectionSides: Record<SelectionEdge, [Vec, Vec]> = {\n\t\t\ttop: selectionPageBounds.sides[0],\n\t\t\tright: selectionPageBounds.sides[1],\n\t\t\t// need bottom and left to be sorted asc, which .sides is not.\n\t\t\tbottom: [selectionPageBounds.corners[3], selectionPageBounds.corners[2]],\n\t\t\tleft: [selectionPageBounds.corners[0], selectionPageBounds.corners[3]],\n\t\t}\n\n\t\tconst result: GapsSnapIndicator[] = []\n\n\t\tif (nearestSnapsX.length > 0) {\n\t\t\tfor (const snap of nearestSnapsX) {\n\t\t\t\tif (snap.type === 'points') continue\n\n\t\t\t\tconst {\n\t\t\t\t\tgap: { breadthIntersection, startEdge, startNode, endNode, length, endEdge },\n\t\t\t\t} = snap\n\n\t\t\t\tswitch (snap.type) {\n\t\t\t\t\tcase 'gap_center': {\n\t\t\t\t\t\t// create\n\t\t\t\t\t\tconst newGapsLength = (length - selectionPageBounds.width) / 2\n\t\t\t\t\t\tconst gapBreadthIntersection = rangeIntersection(\n\t\t\t\t\t\t\tbreadthIntersection[0],\n\t\t\t\t\t\t\tbreadthIntersection[1],\n\t\t\t\t\t\t\tselectionPageBounds.minY,\n\t\t\t\t\t\t\tselectionPageBounds.maxY\n\t\t\t\t\t\t)!\n\t\t\t\t\t\tresult.push({\n\t\t\t\t\t\t\ttype: 'gaps',\n\t\t\t\t\t\t\tdirection: 'horizontal',\n\t\t\t\t\t\t\tid: uniqueId(),\n\t\t\t\t\t\t\tgaps: [\n\t\t\t\t\t\t\t\t...findAdjacentGaps(\n\t\t\t\t\t\t\t\t\thorizontal,\n\t\t\t\t\t\t\t\t\tstartNode.id,\n\t\t\t\t\t\t\t\t\tnewGapsLength,\n\t\t\t\t\t\t\t\t\t'backward',\n\t\t\t\t\t\t\t\t\tgapBreadthIntersection\n\t\t\t\t\t\t\t\t),\n\t\t\t\t\t\t\t\t{\n\t\t\t\t\t\t\t\t\tstartEdge,\n\t\t\t\t\t\t\t\t\tendEdge: selectionSides.left,\n\t\t\t\t\t\t\t\t},\n\t\t\t\t\t\t\t\t{\n\t\t\t\t\t\t\t\t\tstartEdge: selectionSides.right,\n\t\t\t\t\t\t\t\t\tendEdge,\n\t\t\t\t\t\t\t\t},\n\t\t\t\t\t\t\t\t...findAdjacentGaps(\n\t\t\t\t\t\t\t\t\thorizontal,\n\t\t\t\t\t\t\t\t\tendNode.id,\n\t\t\t\t\t\t\t\t\tnewGapsLength,\n\t\t\t\t\t\t\t\t\t'forward',\n\t\t\t\t\t\t\t\t\tgapBreadthIntersection\n\t\t\t\t\t\t\t\t),\n\t\t\t\t\t\t\t],\n\t\t\t\t\t\t})\n\t\t\t\t\t\tbreak\n\t\t\t\t\t}\n\t\t\t\t\tcase 'gap_duplicate': {\n\t\t\t\t\t\t// create\n\t\t\t\t\t\tconst gapBreadthIntersection = rangeIntersection(\n\t\t\t\t\t\t\tbreadthIntersection[0],\n\t\t\t\t\t\t\tbreadthIntersection[1],\n\t\t\t\t\t\t\tselectionPageBounds.minY,\n\t\t\t\t\t\t\tselectionPageBounds.maxY\n\t\t\t\t\t\t)!\n\t\t\t\t\t\tresult.push({\n\t\t\t\t\t\t\ttype: 'gaps',\n\t\t\t\t\t\t\tdirection: 'horizontal',\n\t\t\t\t\t\t\tid: uniqueId(),\n\t\t\t\t\t\t\tgaps:\n\t\t\t\t\t\t\t\tsnap.protrusionDirection === 'left'\n\t\t\t\t\t\t\t\t\t? [\n\t\t\t\t\t\t\t\t\t\t\t{\n\t\t\t\t\t\t\t\t\t\t\t\tstartEdge: selectionSides.right,\n\t\t\t\t\t\t\t\t\t\t\t\tendEdge: startEdge.map((v) =>\n\t\t\t\t\t\t\t\t\t\t\t\t\tv.clone().addXY(-startNode.pageBounds.width, 0)\n\t\t\t\t\t\t\t\t\t\t\t\t) as [Vec, Vec],\n\t\t\t\t\t\t\t\t\t\t\t},\n\t\t\t\t\t\t\t\t\t\t\t{ startEdge, endEdge },\n\t\t\t\t\t\t\t\t\t\t\t...findAdjacentGaps(\n\t\t\t\t\t\t\t\t\t\t\t\thorizontal,\n\t\t\t\t\t\t\t\t\t\t\t\tendNode.id,\n\t\t\t\t\t\t\t\t\t\t\t\tlength,\n\t\t\t\t\t\t\t\t\t\t\t\t'forward',\n\t\t\t\t\t\t\t\t\t\t\t\tgapBreadthIntersection\n\t\t\t\t\t\t\t\t\t\t\t),\n\t\t\t\t\t\t\t\t\t\t]\n\t\t\t\t\t\t\t\t\t: [\n\t\t\t\t\t\t\t\t\t\t\t...findAdjacentGaps(\n\t\t\t\t\t\t\t\t\t\t\t\thorizontal,\n\t\t\t\t\t\t\t\t\t\t\t\tstartNode.id,\n\t\t\t\t\t\t\t\t\t\t\t\tlength,\n\t\t\t\t\t\t\t\t\t\t\t\t'backward',\n\t\t\t\t\t\t\t\t\t\t\t\tgapBreadthIntersection\n\t\t\t\t\t\t\t\t\t\t\t),\n\t\t\t\t\t\t\t\t\t\t\t{ startEdge, endEdge },\n\t\t\t\t\t\t\t\t\t\t\t{\n\t\t\t\t\t\t\t\t\t\t\t\tstartEdge: endEdge.map((v) =>\n\t\t\t\t\t\t\t\t\t\t\t\t\tv.clone().addXY(snap.gap.endNode.pageBounds.width, 0)\n\t\t\t\t\t\t\t\t\t\t\t\t) as [Vec, Vec],\n\t\t\t\t\t\t\t\t\t\t\t\tendEdge: selectionSides.left,\n\t\t\t\t\t\t\t\t\t\t\t},\n\t\t\t\t\t\t\t\t\t\t],\n\t\t\t\t\t\t})\n\n\t\t\t\t\t\tbreak\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif (nearestSnapsY.length > 0) {\n\t\t\tfor (const snap of nearestSnapsY) {\n\t\t\t\tif (snap.type === 'points') continue\n\n\t\t\t\tconst {\n\t\t\t\t\tgap: { breadthIntersection, startEdge, startNode, endNode, length, endEdge },\n\t\t\t\t} = snap\n\n\t\t\t\tswitch (snap.type) {\n\t\t\t\t\tcase 'gap_center': {\n\t\t\t\t\t\tconst newGapsLength = (length - selectionPageBounds.height) / 2\n\t\t\t\t\t\tconst gapBreadthIntersection = rangeIntersection(\n\t\t\t\t\t\t\tbreadthIntersection[0],\n\t\t\t\t\t\t\tbreadthIntersection[1],\n\t\t\t\t\t\t\tselectionPageBounds.minX,\n\t\t\t\t\t\t\tselectionPageBounds.maxX\n\t\t\t\t\t\t)!\n\n\t\t\t\t\t\tresult.push({\n\t\t\t\t\t\t\ttype: 'gaps',\n\t\t\t\t\t\t\tdirection: 'vertical',\n\t\t\t\t\t\t\tid: uniqueId(),\n\t\t\t\t\t\t\tgaps: [\n\t\t\t\t\t\t\t\t...findAdjacentGaps(\n\t\t\t\t\t\t\t\t\tvertical,\n\t\t\t\t\t\t\t\t\tstartNode.id,\n\t\t\t\t\t\t\t\t\tnewGapsLength,\n\t\t\t\t\t\t\t\t\t'backward',\n\t\t\t\t\t\t\t\t\tgapBreadthIntersection\n\t\t\t\t\t\t\t\t),\n\t\t\t\t\t\t\t\t{\n\t\t\t\t\t\t\t\t\tstartEdge,\n\t\t\t\t\t\t\t\t\tendEdge: selectionSides.top,\n\t\t\t\t\t\t\t\t},\n\t\t\t\t\t\t\t\t{\n\t\t\t\t\t\t\t\t\tstartEdge: selectionSides.bottom,\n\t\t\t\t\t\t\t\t\tendEdge,\n\t\t\t\t\t\t\t\t},\n\t\t\t\t\t\t\t\t...findAdjacentGaps(\n\t\t\t\t\t\t\t\t\tvertical,\n\t\t\t\t\t\t\t\t\tsnap.gap.endNode.id,\n\t\t\t\t\t\t\t\t\tnewGapsLength,\n\t\t\t\t\t\t\t\t\t'forward',\n\t\t\t\t\t\t\t\t\tgapBreadthIntersection\n\t\t\t\t\t\t\t\t),\n\t\t\t\t\t\t\t],\n\t\t\t\t\t\t})\n\t\t\t\t\t\tbreak\n\t\t\t\t\t}\n\t\t\t\t\tcase 'gap_duplicate':\n\t\t\t\t\t\t{\n\t\t\t\t\t\t\tconst gapBreadthIntersection = rangeIntersection(\n\t\t\t\t\t\t\t\tbreadthIntersection[0],\n\t\t\t\t\t\t\t\tbreadthIntersection[1],\n\t\t\t\t\t\t\t\tselectionPageBounds.minX,\n\t\t\t\t\t\t\t\tselectionPageBounds.maxX\n\t\t\t\t\t\t\t)!\n\n\t\t\t\t\t\t\tresult.push({\n\t\t\t\t\t\t\t\ttype: 'gaps',\n\t\t\t\t\t\t\t\tdirection: 'vertical',\n\t\t\t\t\t\t\t\tid: uniqueId(),\n\t\t\t\t\t\t\t\tgaps:\n\t\t\t\t\t\t\t\t\tsnap.protrusionDirection === 'top'\n\t\t\t\t\t\t\t\t\t\t? [\n\t\t\t\t\t\t\t\t\t\t\t\t{\n\t\t\t\t\t\t\t\t\t\t\t\t\tstartEdge: selectionSides.bottom,\n\t\t\t\t\t\t\t\t\t\t\t\t\tendEdge: startEdge.map((v) =>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\tv.clone().addXY(0, -startNode.pageBounds.height)\n\t\t\t\t\t\t\t\t\t\t\t\t\t) as [Vec, Vec],\n\t\t\t\t\t\t\t\t\t\t\t\t},\n\t\t\t\t\t\t\t\t\t\t\t\t{ startEdge, endEdge },\n\t\t\t\t\t\t\t\t\t\t\t\t...findAdjacentGaps(\n\t\t\t\t\t\t\t\t\t\t\t\t\tvertical,\n\t\t\t\t\t\t\t\t\t\t\t\t\tendNode.id,\n\t\t\t\t\t\t\t\t\t\t\t\t\tlength,\n\t\t\t\t\t\t\t\t\t\t\t\t\t'forward',\n\t\t\t\t\t\t\t\t\t\t\t\t\tgapBreadthIntersection\n\t\t\t\t\t\t\t\t\t\t\t\t),\n\t\t\t\t\t\t\t\t\t\t\t]\n\t\t\t\t\t\t\t\t\t\t: [\n\t\t\t\t\t\t\t\t\t\t\t\t...findAdjacentGaps(\n\t\t\t\t\t\t\t\t\t\t\t\t\tvertical,\n\t\t\t\t\t\t\t\t\t\t\t\t\tstartNode.id,\n\t\t\t\t\t\t\t\t\t\t\t\t\tlength,\n\t\t\t\t\t\t\t\t\t\t\t\t\t'backward',\n\t\t\t\t\t\t\t\t\t\t\t\t\tgapBreadthIntersection\n\t\t\t\t\t\t\t\t\t\t\t\t),\n\t\t\t\t\t\t\t\t\t\t\t\t{ startEdge, endEdge },\n\t\t\t\t\t\t\t\t\t\t\t\t{\n\t\t\t\t\t\t\t\t\t\t\t\t\tstartEdge: endEdge.map((v) =>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\tv.clone().addXY(0, endNode.pageBounds.height)\n\t\t\t\t\t\t\t\t\t\t\t\t\t) as [Vec, Vec],\n\t\t\t\t\t\t\t\t\t\t\t\t\tendEdge: selectionSides.top,\n\t\t\t\t\t\t\t\t\t\t\t\t},\n\t\t\t\t\t\t\t\t\t\t\t],\n\t\t\t\t\t\t\t})\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tdedupeGapSnaps(result)\n\t\treturn result\n\t}\n}\n\nfunction getResizeSnapPointsForHandle(\n\thandle: SelectionCorner | SelectionEdge | 'any',\n\tselectionPageBounds: Box\n): BoundsSnapPoint[] {\n\tconst { minX, maxX, minY, maxY } = selectionPageBounds\n\tconst result: BoundsSnapPoint[] = []\n\n\t// top left corner\n\tswitch (handle) {\n\t\tcase 'top':\n\t\tcase 'left':\n\t\tcase 'top_left':\n\t\tcase 'any':\n\t\t\tresult.push({\n\t\t\t\tid: 'top_left',\n\t\t\t\thandle: 'top_left',\n\t\t\t\tx: minX,\n\t\t\t\ty: minY,\n\t\t\t})\n\t}\n\n\t// top right corner\n\tswitch (handle) {\n\t\tcase 'top':\n\t\tcase 'right':\n\t\tcase 'top_right':\n\t\tcase 'any':\n\t\t\tresult.push({\n\t\t\t\tid: 'top_right',\n\t\t\t\thandle: 'top_right',\n\t\t\t\tx: maxX,\n\t\t\t\ty: minY,\n\t\t\t})\n\t}\n\n\t// bottom right corner\n\tswitch (handle) {\n\t\tcase 'bottom':\n\t\tcase 'right':\n\t\tcase 'bottom_right':\n\t\tcase 'any':\n\t\t\tresult.push({\n\t\t\t\tid: 'bottom_right',\n\t\t\t\thandle: 'bottom_right',\n\t\t\t\tx: maxX,\n\t\t\t\ty: maxY,\n\t\t\t})\n\t}\n\n\t// bottom left corner\n\tswitch (handle) {\n\t\tcase 'bottom':\n\t\tcase 'left':\n\t\tcase 'bottom_left':\n\t\tcase 'any':\n\t\t\tresult.push({\n\t\t\t\tid: 'bottom_left',\n\t\t\t\thandle: 'bottom_left',\n\t\t\t\tx: minX,\n\t\t\t\ty: maxY,\n\t\t\t})\n\t}\n\n\treturn result\n}\n"],
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