tldraw/dist-esm/lib/shapes/arrow/arrowLabel.mjs.map

A tiny little drawing editor.

{
  "version": 3,
  "sources": ["../../../../src/lib/shapes/arrow/arrowLabel.ts"],
  "sourcesContent": ["import {\n\tArc2d,\n\tBox,\n\tCircle2d,\n\tEdge2d,\n\tEditor,\n\tGeometry2d,\n\tGroup2d,\n\tPolygon2d,\n\tPolyline2d,\n\tTLArrowShape,\n\tTLShape,\n\tVec,\n\tVecLike,\n\tclamp,\n\tcreateComputedCache,\n\texhaustiveSwitchError,\n\tgetChangedKeys,\n\tpointInPolygon,\n\ttoRichText,\n} from '@tldraw/editor'\nimport { isEmptyRichText, renderHtmlFromRichTextForMeasurement } from '../../utils/text/richText'\nimport {\n\tARROW_LABEL_FONT_SIZES,\n\tARROW_LABEL_PADDING,\n\tFONT_FAMILIES,\n\tLABEL_TO_ARROW_PADDING,\n\tSTROKE_SIZES,\n\tTEXT_PROPS,\n} from '../shared/default-shape-constants'\nimport { TLArrowInfo } from './arrow-types'\nimport { getArrowInfo } from './getArrowInfo'\n\nexport function getArrowBodyGeometry(editor: Editor, shape: TLArrowShape) {\n\tconst info = getArrowInfo(editor, shape)!\n\tswitch (info.type) {\n\t\tcase 'straight':\n\t\t\treturn new Edge2d({\n\t\t\t\tstart: Vec.From(info.start.point),\n\t\t\t\tend: Vec.From(info.end.point),\n\t\t\t})\n\t\tcase 'arc':\n\t\t\treturn new Arc2d({\n\t\t\t\tcenter: Vec.Cast(info.handleArc.center),\n\t\t\t\tstart: Vec.Cast(info.start.point),\n\t\t\t\tend: Vec.Cast(info.end.point),\n\t\t\t\tsweepFlag: info.bodyArc.sweepFlag,\n\t\t\t\tlargeArcFlag: info.bodyArc.largeArcFlag,\n\t\t\t})\n\t\tcase 'elbow':\n\t\t\treturn new Polyline2d({ points: info.route.points })\n\t\tdefault:\n\t\t\texhaustiveSwitchError(info, 'type')\n\t}\n}\n\nconst labelSizeCache = createComputedCache(\n\t'arrow label size',\n\t(editor: Editor, shape: TLArrowShape) => {\n\t\teditor.fonts.trackFontsForShape(shape)\n\t\tlet width = 0\n\t\tlet height = 0\n\n\t\tconst bodyGeom = getArrowBodyGeometry(editor, shape)\n\t\t// We use 'i' as a default label to measure against as a minimum width.\n\t\tconst isEmpty = isEmptyRichText(shape.props.richText)\n\t\tconst html = renderHtmlFromRichTextForMeasurement(\n\t\t\teditor,\n\t\t\tisEmpty ? toRichText('i') : shape.props.richText\n\t\t)\n\n\t\tconst bodyBounds = bodyGeom.bounds\n\n\t\tconst fontSize = getArrowLabelFontSize(shape)\n\n\t\t// First we measure the text with no constraints\n\t\tconst { w, h } = editor.textMeasure.measureHtml(html, {\n\t\t\t...TEXT_PROPS,\n\t\t\tfontFamily: FONT_FAMILIES[shape.props.font],\n\t\t\tfontSize,\n\t\t\tmaxWidth: null,\n\t\t})\n\n\t\twidth = w\n\t\theight = h\n\n\t\tlet shouldSquish = false\n\n\t\t// If the text is wider than the body, we need to squish it\n\t\tconst info = getArrowInfo(editor, shape)!\n\t\tconst labelToArrowPadding = getLabelToArrowPadding(shape)\n\t\tconst margin =\n\t\t\tinfo.type === 'elbow'\n\t\t\t\t? Math.max(info.elbow.A.arrowheadOffset + labelToArrowPadding, 32) +\n\t\t\t\t\tMath.max(info.elbow.B.arrowheadOffset + labelToArrowPadding, 32)\n\t\t\t\t: 64\n\n\t\tif (bodyBounds.width > bodyBounds.height) {\n\t\t\twidth = Math.max(Math.min(w, margin), Math.min(bodyBounds.width - margin, w))\n\t\t\tshouldSquish = true\n\t\t} else if (width > 16 * fontSize) {\n\t\t\twidth = 16 * fontSize\n\t\t\tshouldSquish = true\n\t\t}\n\n\t\tif (shouldSquish) {\n\t\t\tconst { w: squishedWidth, h: squishedHeight } = editor.textMeasure.measureHtml(html, {\n\t\t\t\t...TEXT_PROPS,\n\t\t\t\tfontFamily: FONT_FAMILIES[shape.props.font],\n\t\t\t\tfontSize,\n\t\t\t\tmaxWidth: width,\n\t\t\t})\n\n\t\t\twidth = squishedWidth\n\t\t\theight = squishedHeight\n\t\t}\n\n\t\treturn new Vec(width, height).addScalar(ARROW_LABEL_PADDING * 2 * shape.props.scale)\n\t},\n\t{\n\t\tareRecordsEqual: (a, b) => {\n\t\t\tif (a.props === b.props) return true\n\n\t\t\t// If the only thing that has changed is the label position, we can skip recalculating the size\n\t\t\tconst changedKeys = getChangedKeys(a.props, b.props)\n\t\t\treturn changedKeys.length === 1 && changedKeys[0] === 'labelPosition'\n\t\t},\n\t}\n)\n\nfunction getArrowLabelSize(editor: Editor, shape: TLArrowShape) {\n\treturn labelSizeCache.get(editor, shape.id) ?? new Vec(0, 0)\n}\n\nfunction getLabelToArrowPadding(shape: TLArrowShape) {\n\tconst strokeWidth = STROKE_SIZES[shape.props.size]\n\tconst labelToArrowPadding =\n\t\t(LABEL_TO_ARROW_PADDING +\n\t\t\t(strokeWidth - STROKE_SIZES.s) * 2 +\n\t\t\t(strokeWidth === STROKE_SIZES.xl ? 20 : 0)) *\n\t\tshape.props.scale\n\n\treturn labelToArrowPadding\n}\n\n/**\n * Return the range of possible label positions for an arrow. The full possible range is 0 to 1, but\n * as the label itself takes up space the usable range is smaller.\n */\nfunction getArrowLabelRange(editor: Editor, shape: TLArrowShape, info: TLArrowInfo) {\n\tconst bodyGeom = getArrowBodyGeometry(editor, shape)\n\tconst dbgPoints: VecLike[] = []\n\tconst dbg: Geometry2d[] = [new Group2d({ children: [bodyGeom], debugColor: 'lime' })]\n\n\tconst labelSize = getArrowLabelSize(editor, shape)\n\tconst labelToArrowPadding = getLabelToArrowPadding(shape)\n\tconst paddingRelative = labelToArrowPadding / bodyGeom.length\n\n\t// we can calculate the range by sticking the center of the label at the very start/end of the\n\t// arrow, and seeing where the label intersects with the arrow. Then, if we move the label's\n\t// center to that point, that'll be the start/end of the range.\n\n\tlet startBox, endBox\n\tif (info.type === 'elbow') {\n\t\t// for elbow arrows, because they have multiple segments but are always axis-aligned, we can use\n\t\t// an expanded box. This helps keep the box from partially covering the first segment when it's\n\t\t// very small.\n\t\tdbgPoints.push(info.start.point, info.end.point)\n\t\tstartBox = Box.FromCenter(info.start.point, labelSize).expandBy(labelToArrowPadding)\n\t\tendBox = Box.FromCenter(info.end.point, labelSize).expandBy(labelToArrowPadding)\n\t} else {\n\t\t// for other arrows, we move along the arrow by the padding amount to find the start/end points\n\t\tconst startPoint = bodyGeom.interpolateAlongEdge(paddingRelative)\n\t\tconst endPoint = bodyGeom.interpolateAlongEdge(1 - paddingRelative)\n\t\tdbgPoints.push(startPoint, endPoint)\n\t\tstartBox = Box.FromCenter(startPoint, labelSize)\n\t\tendBox = Box.FromCenter(endPoint, labelSize)\n\t}\n\tconst startIntersections = bodyGeom.intersectPolygon(startBox.corners)\n\tconst endIntersections = bodyGeom.intersectPolygon(endBox.corners)\n\n\tconst startConstrained = furthest(info.start.point, startIntersections)\n\tconst endConstrained = furthest(info.end.point, endIntersections)\n\n\tlet startRelative = startConstrained ? bodyGeom.uninterpolateAlongEdge(startConstrained) : 0.5\n\tlet endRelative = endConstrained ? bodyGeom.uninterpolateAlongEdge(endConstrained) : 0.5\n\n\tif (startRelative > endRelative) {\n\t\tstartRelative = 0.5\n\t\tendRelative = 0.5\n\t}\n\n\tfor (const pt of [...startIntersections, ...endIntersections, ...dbgPoints]) {\n\t\tdbg.push(\n\t\t\tnew Circle2d({\n\t\t\t\tx: pt.x - 3,\n\t\t\t\ty: pt.y - 3,\n\t\t\t\tradius: 3,\n\t\t\t\tisFilled: false,\n\t\t\t\tdebugColor: 'magenta',\n\t\t\t\tignore: true,\n\t\t\t})\n\t\t)\n\t}\n\tdbg.push(\n\t\tnew Polygon2d({\n\t\t\tpoints: startBox.corners,\n\t\t\tdebugColor: 'lime',\n\t\t\tisFilled: false,\n\t\t\tignore: true,\n\t\t}),\n\t\tnew Polygon2d({\n\t\t\tpoints: endBox.corners,\n\t\t\tdebugColor: 'lime',\n\t\t\tisFilled: false,\n\t\t\tignore: true,\n\t\t})\n\t)\n\n\treturn { start: startRelative, end: endRelative, dbg }\n}\n\ninterface ArrowheadInfo {\n\thasStartBinding: boolean\n\thasEndBinding: boolean\n\thasStartArrowhead: boolean\n\thasEndArrowhead: boolean\n}\nexport function getArrowLabelPosition(editor: Editor, shape: TLArrowShape, isEditing: boolean) {\n\tif (!isEditing && isEmptyRichText(shape.props.richText)) {\n\t\t// Short-circuit for empty labels.\n\t\tconst bodyGeom = getArrowBodyGeometry(editor, shape)\n\t\tconst labelCenter = bodyGeom.interpolateAlongEdge(0.5)\n\t\treturn { box: Box.FromCenter(labelCenter, new Vec(0, 0)), debugGeom: [] }\n\t}\n\n\tconst debugGeom: Geometry2d[] = []\n\tconst info = getArrowInfo(editor, shape)!\n\n\tconst arrowheadInfo: ArrowheadInfo = {\n\t\thasStartBinding: !!info.bindings.start,\n\t\thasEndBinding: !!info.bindings.end,\n\t\thasStartArrowhead: info.start.arrowhead !== 'none',\n\t\thasEndArrowhead: info.end.arrowhead !== 'none',\n\t}\n\n\tconst range = getArrowLabelRange(editor, shape, info)\n\tif (range.dbg) debugGeom.push(...range.dbg)\n\n\tconst clampedPosition = getClampedPosition(shape, range, arrowheadInfo)\n\tconst bodyGeom = getArrowBodyGeometry(editor, shape)\n\tconst labelCenter = bodyGeom.interpolateAlongEdge(clampedPosition)\n\tconst labelSize = getArrowLabelSize(editor, shape)\n\n\treturn { box: Box.FromCenter(labelCenter, labelSize), debugGeom }\n}\n\nfunction getClampedPosition(\n\tshape: TLArrowShape,\n\trange: { start: number; end: number },\n\tarrowheadInfo: ArrowheadInfo\n) {\n\tconst { hasEndArrowhead, hasEndBinding, hasStartBinding, hasStartArrowhead } = arrowheadInfo\n\tconst clampedPosition = clamp(\n\t\tshape.props.labelPosition,\n\t\thasStartArrowhead || hasStartBinding ? range.start : 0,\n\t\thasEndArrowhead || hasEndBinding ? range.end : 1\n\t)\n\n\treturn clampedPosition\n}\n\nfunction furthest(from: VecLike, candidates: VecLike[]): VecLike | null {\n\tlet furthest: VecLike | null = null\n\tlet furthestDist = -Infinity\n\n\tfor (const candidate of candidates) {\n\t\tconst dist = Vec.Dist2(from, candidate)\n\t\tif (dist > furthestDist) {\n\t\t\tfurthest = candidate\n\t\t\tfurthestDist = dist\n\t\t}\n\t}\n\n\treturn furthest\n}\n\nexport function getArrowLabelFontSize(shape: TLArrowShape) {\n\treturn ARROW_LABEL_FONT_SIZES[shape.props.size] * shape.props.scale\n}\n\nexport function getArrowLabelDefaultPosition(editor: Editor, shape: TLArrowShape) {\n\tconst info = getArrowInfo(editor, shape)!\n\tswitch (info.type) {\n\t\tcase 'straight':\n\t\tcase 'arc':\n\t\t\treturn 0.5\n\t\tcase 'elbow': {\n\t\t\tconst midpointHandle = info.route.midpointHandle\n\t\t\tconst bodyGeom = getArrowBodyGeometry(editor, shape)\n\t\t\tif (midpointHandle && bodyGeom) {\n\t\t\t\treturn bodyGeom.uninterpolateAlongEdge(midpointHandle.point)\n\t\t\t}\n\t\t\treturn 0.5\n\t\t}\n\t\tdefault:\n\t\t\texhaustiveSwitchError(info, 'type')\n\t}\n}\n\n/** @internal */\nexport function isOverArrowLabel(editor: Editor, shape: TLShape) {\n\tif (!editor.isShapeOfType(shape, 'arrow')) return false\n\n\tconst pointInShapeSpace = editor.getPointInShapeSpace(shape, editor.inputs.getCurrentPagePoint())\n\t// How should we handle multiple labels? Do shapes ever have multiple labels?\n\tconst labelGeometry = editor.getShapeGeometry<Group2d>(shape).children[1]\n\t// Knowing what we know about arrows... if the shape has no text in its label,\n\t// then the label geometry should not be there.\n\treturn labelGeometry && pointInPolygon(pointInShapeSpace, labelGeometry.vertices)\n}\n"],
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