{
  "version": 3,
  "sources": ["../../../src/lib/overlays/ArrowBindingHintOverlayUtil.ts"],
  "sourcesContent": ["import {\n\tgetPerfectDashProps,\n\tOverlayUtil,\n\tPI2,\n\tTLArrowShape,\n\tTLOverlay,\n\tTLShapeId,\n\tVec,\n} from '@tldraw/editor'\nimport { TLArrowInfo } from '../shapes/arrow/arrow-types'\nimport { getArrowInfo } from '../shapes/arrow/getArrowInfo'\nimport { getArrowBindings } from '../shapes/arrow/shared'\n\n/** @public */\nexport interface TLArrowBindingHintOverlay extends TLOverlay {\n\tprops: {\n\t\tarrowId: TLShapeId\n\t}\n}\n\n/**\n * Overlay util for the dashed binding hint shown on bound arrows. Draws stubs\n * along the arrow's handle path, from each bound endpoint's snapped body\n * position to the user's intended (handle) position, with a precision marker\n * at the handle.\n *\n * @public\n */\nexport class ArrowBindingHintOverlayUtil extends OverlayUtil<TLArrowBindingHintOverlay> {\n\tstatic override type = 'arrow_binding_hint'\n\toverride options = {\n\t\tzIndex: 150,\n\t\tstrokeWidth: 2,\n\t\topacity: 0.16,\n\t\tdashLengthRatio: 2.5,\n\t\tdotRadius: 4,\n\t\tcrossSize: 6,\n\t\tdashedMinZoom: 0.2,\n\t}\n\n\toverride isActive(): boolean {\n\t\tconst editor = this.editor\n\t\tif (editor.getIsReadonly()) return false\n\t\tconst id = editor.getOnlySelectedShapeId()\n\t\tif (!id) return false\n\t\tconst shape = editor.getShape(id)\n\t\tif (!shape || shape.type !== 'arrow') return false\n\t\tif (\n\t\t\t!editor.isInAny(\n\t\t\t\t'select.idle',\n\t\t\t\t'select.pointing_handle',\n\t\t\t\t'select.dragging_handle',\n\t\t\t\t'select.translating',\n\t\t\t\t'arrow.dragging'\n\t\t\t)\n\t\t) {\n\t\t\treturn false\n\t\t}\n\t\tconst bindings = getArrowBindings(editor, shape as TLArrowShape)\n\t\treturn Boolean(bindings.start || bindings.end)\n\t}\n\n\toverride getOverlays(): TLArrowBindingHintOverlay[] {\n\t\tconst id = this.editor.getOnlySelectedShapeId()\n\t\tif (!id) return []\n\t\treturn [\n\t\t\t{\n\t\t\t\tid: 'arrow_binding_hint',\n\t\t\t\ttype: 'arrow_binding_hint',\n\t\t\t\tprops: { arrowId: id },\n\t\t\t},\n\t\t]\n\t}\n\n\toverride render(ctx: CanvasRenderingContext2D, overlays: TLArrowBindingHintOverlay[]): void {\n\t\tconst overlay = overlays[0]\n\t\tif (!overlay) return\n\n\t\tconst editor = this.editor\n\t\tconst shape = editor.getShape(overlay.props.arrowId) as TLArrowShape | undefined\n\t\tif (!shape) return\n\n\t\tconst info = getArrowInfo(editor, shape)\n\t\tif (!info?.isValid) return\n\n\t\tconst bindings = getArrowBindings(editor, shape)\n\t\tif (!bindings.start && !bindings.end) return\n\n\t\tconst pageTransform = editor.getShapePageTransform(shape)\n\t\tif (!pageTransform) return\n\n\t\tconst zoom = editor.getZoomLevel()\n\t\tconst colors = editor.getCurrentTheme().colors[editor.getColorMode()]\n\t\tconst strokeWidth = this.options.strokeWidth / zoom\n\n\t\tctx.save()\n\t\tctx.transform(\n\t\t\tpageTransform.a,\n\t\t\tpageTransform.b,\n\t\t\tpageTransform.c,\n\t\t\tpageTransform.d,\n\t\t\tpageTransform.e,\n\t\t\tpageTransform.f\n\t\t)\n\n\t\tctx.strokeStyle = colors.text\n\t\tctx.fillStyle = colors.text\n\t\tctx.lineWidth = strokeWidth\n\t\tctx.lineCap = 'round'\n\t\tctx.lineJoin = 'round'\n\t\tctx.globalAlpha = this.options.opacity\n\n\t\tif (bindings.start) {\n\t\t\tthis.drawEndpoint(\n\t\t\t\tctx,\n\t\t\t\tinfo,\n\t\t\t\t'start',\n\t\t\t\tbindings.start.props.isExact,\n\t\t\t\tbindings.start.props.isPrecise,\n\t\t\t\tstrokeWidth,\n\t\t\t\tzoom\n\t\t\t)\n\t\t}\n\t\tif (bindings.end) {\n\t\t\tthis.drawEndpoint(\n\t\t\t\tctx,\n\t\t\t\tinfo,\n\t\t\t\t'end',\n\t\t\t\tbindings.end.props.isExact,\n\t\t\t\tbindings.end.props.isPrecise,\n\t\t\t\tstrokeWidth,\n\t\t\t\tzoom\n\t\t\t)\n\t\t}\n\n\t\tctx.restore()\n\t}\n\n\tprivate drawEndpoint(\n\t\tctx: CanvasRenderingContext2D,\n\t\tinfo: TLArrowInfo,\n\t\tside: 'start' | 'end',\n\t\tisExact: boolean,\n\t\tisPrecise: boolean,\n\t\tstrokeWidth: number,\n\t\tzoom: number\n\t) {\n\t\tconst handle = info[side].handle\n\t\tconst point = info[side].point\n\t\tconst dist = Vec.Dist(handle, point)\n\n\t\t// Stop the dashed stub at the marker's outer edge so it doesn't pass\n\t\t// through the dot/cross. The cross's corners (leg endpoints) sit at\n\t\t// half the diagonal of its bounding square, not half its side.\n\t\tconst markerRadius =\n\t\t\t(isPrecise ? (this.options.crossSize / 2) * Math.SQRT2 : this.options.dotRadius) / zoom\n\n\t\tif (dist > markerRadius + 0.5) {\n\t\t\tctx.save()\n\t\t\tctx.beginPath()\n\n\t\t\tlet pathLength: number\n\n\t\t\tif (info.type === 'arc') {\n\t\t\t\t// Render along the body arc so the stub sits on the same circle as\n\t\t\t\t// the visible arrow body; project handle radially onto that circle.\n\t\t\t\tconst { center, radius, sweepFlag } = info.bodyArc\n\t\t\t\tconst pointAngle = Math.atan2(point.y - center.y, point.x - center.x)\n\t\t\t\tconst handleAngle = Math.atan2(handle.y - center.y, handle.x - center.x)\n\t\t\t\tconst anticlockwise = !sweepFlag\n\t\t\t\tconst sign = (sweepFlag ? 1 : -1) * (side === 'start' ? 1 : -1)\n\t\t\t\tconst trimmedHandleAngle = handleAngle + sign * (markerRadius / radius)\n\n\t\t\t\t// Handle and point are close points on the same circle, so the\n\t\t\t\t// stub follows the short arc between them. Use the shortest signed\n\t\t\t\t// angular distance to get the arc length, then trim the marker.\n\t\t\t\tlet handleToPointSweep = pointAngle - handleAngle\n\t\t\t\tif (handleToPointSweep > Math.PI) handleToPointSweep -= PI2\n\t\t\t\telse if (handleToPointSweep < -Math.PI) handleToPointSweep += PI2\n\t\t\t\tpathLength = Math.max(0, radius * Math.abs(handleToPointSweep) - markerRadius)\n\n\t\t\t\tif (side === 'start') {\n\t\t\t\t\tctx.arc(center.x, center.y, radius, trimmedHandleAngle, pointAngle, anticlockwise)\n\t\t\t\t} else {\n\t\t\t\t\tctx.arc(center.x, center.y, radius, pointAngle, trimmedHandleAngle, anticlockwise)\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tpathLength = dist - markerRadius\n\t\t\t\tconst t = markerRadius / dist\n\t\t\t\tconst trimmedHandle = {\n\t\t\t\t\tx: handle.x + (point.x - handle.x) * t,\n\t\t\t\t\ty: handle.y + (point.y - handle.y) * t,\n\t\t\t\t}\n\t\t\t\tctx.moveTo(trimmedHandle.x, trimmedHandle.y)\n\t\t\t\tctx.lineTo(point.x, point.y)\n\t\t\t}\n\n\t\t\t// Below the dash threshold the dashes get too small to read, so\n\t\t\t// fall back to a solid stub.\n\t\t\tif (zoom >= this.options.dashedMinZoom) {\n\t\t\t\tconst { strokeDasharray, strokeDashoffset } = getPerfectDashProps(pathLength, strokeWidth, {\n\t\t\t\t\tstyle: 'dashed',\n\t\t\t\t\tend: 'skip',\n\t\t\t\t\tstart: 'skip',\n\t\t\t\t})\n\n\t\t\t\tif (strokeDasharray !== 'none') {\n\t\t\t\t\tconst [dashLength, gapLength] = strokeDasharray.split(' ').map(Number)\n\t\t\t\t\tctx.setLineDash([dashLength, gapLength])\n\t\t\t\t\tctx.lineDashOffset = Number(strokeDashoffset)\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tctx.stroke()\n\t\t\tctx.restore()\n\t\t}\n\n\t\tif (isExact) return\n\n\t\tconst markerAngle = dist > 0.5 ? this.getMarkerAngle(info, side, handle, point) : 0\n\n\t\tif (isPrecise) {\n\t\t\tconst half = this.options.crossSize / zoom / 2\n\t\t\tctx.save()\n\t\t\tctx.translate(handle.x, handle.y)\n\t\t\tctx.rotate(markerAngle)\n\t\t\tctx.beginPath()\n\t\t\tctx.moveTo(-half, -half)\n\t\t\tctx.lineTo(half, half)\n\t\t\tctx.moveTo(-half, half)\n\t\t\tctx.lineTo(half, -half)\n\t\t\tctx.stroke()\n\t\t\tctx.restore()\n\t\t} else {\n\t\t\tconst radius = this.options.dotRadius / zoom\n\t\t\tctx.beginPath()\n\t\t\tctx.arc(handle.x, handle.y, radius, 0, PI2)\n\t\t\tctx.stroke()\n\t\t}\n\t}\n\n\t/** Tangent direction at the handle, oriented toward the body. */\n\tprivate getMarkerAngle(\n\t\tinfo: TLArrowInfo,\n\t\tside: 'start' | 'end',\n\t\thandle: { x: number; y: number },\n\t\tpoint: { x: number; y: number }\n\t): number {\n\t\tif (info.type === 'arc') {\n\t\t\tconst { center, sweepFlag } = info.bodyArc\n\t\t\tconst radial = Math.atan2(handle.y - center.y, handle.x - center.x)\n\t\t\t// tangent perpendicular to radial; sign chosen to point toward the body\n\t\t\tconst sign = (sweepFlag ? 1 : -1) * (side === 'start' ? 1 : -1)\n\t\t\treturn radial + (sign * Math.PI) / 2\n\t\t}\n\t\treturn Math.atan2(point.y - handle.y, point.x - handle.x)\n\t}\n}\n"],
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