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Every corner you place // is a leg; when you click back near the start the loop does NOT snap shut — // that click becomes its own vertex (the point where your closing sight // actually landed), and the gap between it and the true start is drawn as an // --ns-accent hairline: the misclosure. Nothing is hidden or auto-corrected. // // The ONE governing scalar is the misclosure vector (dx, dy) between the // closing vertex and vertex 0. Pressing "Balance traverse" runs the 1807 // Bowditch compass rule: each vertex i is corrected by // misclosure * (chainage_i / totalPerimeter) // — chainage_i being the cumulative leg distance walked to reach it. Vertex 0 // (chainage 0) never moves; the closing vertex (chainage = totalPerimeter) // gets the FULL misclosure and lands exactly on vertex 0, merging into it. // Every vertex in between moves a fraction set by how much distance it // carries — never equal-per-vertex, never all dumped on the last point. That // gradation IS the falsifiable content of the rule: short first legs stay // almost put, the long final leg absorbs most of the correction, because // error is assumed proportional to distance run, not to vertex count. // // All corrections are pre-computed once (target_i = origin_i + correction_i) // and then every vertex is driven by ONE shared spring scalar s: 0 -> 1 // (near-critically damped, one small overshoot), position_i = origin_i + // (target_i - origin_i) * s. That is what makes it read as a drawstring // pulling the whole ring taut at once, not one point jumping to close a gap. // // Distinct from stock polygon tools: this never silently teleports the last // click onto the first. The gap is drawn, its precision graded live // ("1:4300", Geist Mono) as a Bowditch survey report would, and closing it is // an explicit, announced, undoable-until-pressed action. DOM + SVG + CSS // only, tokens only, no canvas. // --------------------------------------------------------------------------- export interface BowditchPoint { x: number; y: number; } export interface BowditchCloseResult { ratio: number; areaHectares: number; perimeterMeters: number; } export interface BowditchCloseProps { /** vertices already placed, in local px coordinates */ initialVertices?: BowditchPoint[]; /** true when the last entry of initialVertices is already the misclosure/closing point */ initialClosed?: boolean; /** canvas size in px */ width?: number; height?: number; /** px per metre — governs the 1 m / 10 m nudge step and the area readout */ pxPerMeter?: number; /** fires once, the moment Balance finishes */ onBalance?: (result: BowditchCloseResult) => void; /** accessible label prefix for the drawing region */ label?: string; className?: string; } type Phase = "drawing" | "unbalanced" | "balancing" | "balanced"; const CLOSE_RADIUS = 22; // px — how near vertex 0 a click must land to become the closing vertex const VERTEX_R = 6; // 12px circle, visible dot size const VERTEX_HIT_R = 12; // 24px invisible hit area, centered on the same point const SPRING_K = 230; const SPRING_ZETA = 0.9; // just under critical — one small overshoot, like a drawstring taking up the last of the slack const SPRING_C = 2 * SPRING_ZETA * Math.sqrt(SPRING_K); const REST_S = 0.01; const REST_V = 0.015; function dist(a: BowditchPoint, b: BowditchPoint) { return Math.hypot(a.x - b.x, a.y - b.y); } function chainageOf(vs: BowditchPoint[]): number[] { const c = [0]; for (let i = 1; i < vs.length; i++) c.push(c[i - 1] + dist(vs[i - 1], vs[i])); return c; } function shoelaceArea(vs: BowditchPoint[]): number { let s = 0; for (let i = 0; i < vs.length; i++) { const a = vs[i]; const b = vs[(i + 1) % vs.length]; s += a.x * b.y - b.x * a.y; } return Math.abs(s) / 2; } function pathFrom(vs: BowditchPoint[], close: boolean): string { if (vs.length === 0) return ""; let d = `M ${vs[0].x.toFixed(2)} ${vs[0].y.toFixed(2)}`; for (let i = 1; i < vs.length; i++) d += ` L ${vs[i].x.toFixed(2)} ${vs[i].y.toFixed(2)}`; if (close) d += " Z"; return d; } export function BowditchClose({ initialVertices, initialClosed = false, width = 440, height = 300, pxPerMeter = 5, onBalance, label = "Geofence traverse", className = "", }: BowditchCloseProps) { const uid = useId().replace(/[:]/g, ""); const startPhase: Phase = initialClosed && (initialVertices?.length ?? 0) >= 4 ? "unbalanced" : "drawing"; const [verts, setVerts] = useState(() => initialVertices?.map((p) => ({ ...p })) ?? []); const [phase, setPhase] = useState(startPhase); const [renderVerts, setRenderVerts] = useState(null); const [frozenRatio, setFrozenRatio] = useState(null); const [reducedGhost, setReducedGhost] = useState(null); const [reduced, setReduced] = useState(false); const containerRef = useRef(null); const vertexRefs = useRef>(new Map()); const springRef = useRef<{ raf: number; s: number; vel: number; origins: BowditchPoint[]; targets: BowditchPoint[]; lastT: number; } | null>(null); useEffect(() => { const mq = window.matchMedia("(prefers-reduced-motion: reduce)"); const update = () => setReduced(mq.matches); update(); mq.addEventListener("change", update); return () => mq.removeEventListener("change", update); }, []); useEffect( () => () => { if (springRef.current) cancelAnimationFrame(springRef.current.raf); }, [] ); // pts is the single source both the ring/hairline drawing and the vertex // buttons read from — during the tween that is the interpolated frame, // otherwise it is the committed vertex list. const pts = phase === "balancing" && renderVerts ? renderVerts : verts; const chainage = useMemo(() => chainageOf(verts), [verts]); const totalRun = chainage[chainage.length - 1] ?? 0; const misclosureMag = phase !== "drawing" && verts.length > 0 ? dist(verts[0], verts[verts.length - 1]) : 0; const liveRatio = misclosureMag > 0 && totalRun > 0 ? totalRun / misclosureMag : null; const ratioToShow = phase === "balanced" || phase === "balancing" ? frozenRatio : liveRatio; const finalize = useCallback( (targets: BowditchPoint[], ratio: number) => { const closedRing = targets.slice(0, -1); const perimeterPx = chainageOf(targets)[targets.length - 1] ?? 0; const areaPx2 = shoelaceArea(closedRing); const perimeterMeters = perimeterPx / pxPerMeter; const areaHectares = areaPx2 / (pxPerMeter * pxPerMeter) / 10000; setVerts(closedRing); setPhase("balanced"); setRenderVerts(null); springRef.current = null; onBalance?.({ ratio, areaHectares, perimeterMeters }); // the closing vertex just merged into vertex 0 — if it (or anything // past the new end) held focus, land it on vertex 0 rather than losing // focus to the document. const active = document.activeElement; const stillMounted = active instanceof HTMLElement && containerRef.current?.contains(active); if (!stillMounted || (active && !closedRing.some((_, i) => vertexRefs.current.get(i) === active))) { vertexRefs.current.get(0)?.focus(); } }, [onBalance, pxPerMeter] ); const runSpring = useCallback( (origins: BowditchPoint[], targets: BowditchPoint[], ratio: number) => { springRef.current = { raf: 0, s: 0, vel: 0, origins, targets, lastT: 0 }; const tick = (now: number) => { const st = springRef.current; if (!st) return; const dt = st.lastT === 0 ? 1 / 60 : Math.min(0.032, (now - st.lastT) / 1000); st.lastT = now; const disp = st.s - 1; st.vel += (-SPRING_K * disp - SPRING_C * st.vel) * dt; st.s += st.vel * dt; const frame = st.origins.map((o, i) => ({ x: o.x + (st.targets[i].x - o.x) * st.s, y: o.y + (st.targets[i].y - o.y) * st.s, })); setRenderVerts(frame); if (Math.abs(st.s - 1) < REST_S && Math.abs(st.vel) < REST_V) { finalize(st.targets, ratio); return; } st.raf = requestAnimationFrame(tick); }; springRef.current.raf = requestAnimationFrame(tick); }, [finalize] ); const onBalancePress = useCallback(() => { if (phase !== "unbalanced") return; const n = verts.length - 1; const total = chainage[n] ?? 0; if (total <= 0 || liveRatio === null) return; const ratioAtClose = liveRatio; const misclosure = { dx: verts[0].x - verts[n].x, dy: verts[0].y - verts[n].y }; const targets = verts.map((v, i) => ({ x: v.x + misclosure.dx * (chainage[i] / total), y: v.y + misclosure.dy * (chainage[i] / total), })); setFrozenRatio(ratioAtClose); if (reduced) { setReducedGhost(verts.slice(0, -1)); finalize(targets, ratioAtClose); return; } setPhase("balancing"); runSpring( verts.map((v) => ({ ...v })), targets, ratioAtClose ); }, [phase, verts, chainage, liveRatio, reduced, finalize, runSpring]); const onReset = useCallback(() => { if (springRef.current) cancelAnimationFrame(springRef.current.raf); springRef.current = null; setVerts([]); setPhase("drawing"); setRenderVerts(null); setFrozenRatio(null); setReducedGhost(null); }, []); const localPoint = useCallback( (e: { clientX: number; clientY: number }): BowditchPoint => { const el = containerRef.current; if (!el) return { x: 0, y: 0 }; const rect = el.getBoundingClientRect(); const sx = width / rect.width; const sy = height / rect.height; return { x: (e.clientX - rect.left) * sx, y: (e.clientY - rect.top) * sy }; }, [width, height] ); const onCanvasClick = useCallback( (e: React.MouseEvent) => { if (phase !== "drawing") return; const pt = localPoint(e); if (verts.length >= 3 && dist(pt, verts[0]) <= CLOSE_RADIUS) { setVerts([...verts, pt]); setPhase("unbalanced"); return; } setVerts((vs) => [...vs, pt]); }, [phase, verts, localPoint] ); const onVertexKeyDown = useCallback( (i: number, e: React.KeyboardEvent) => { if (phase === "balancing") return; let dx = 0; let dy = 0; const step = (e.shiftKey ? 10 : 1) * pxPerMeter; if (e.key === "ArrowUp") dy = -step; else if (e.key === "ArrowDown") dy = step; else if (e.key === "ArrowLeft") dx = -step; else if (e.key === "ArrowRight") dx = step; else return; e.preventDefault(); setVerts((vs) => vs.map((v, idx) => (idx === i ? { x: v.x + dx, y: v.y + dy } : v))); }, [phase, pxPerMeter] ); const closed = phase === "balanced"; const showHairline = phase === "unbalanced" || phase === "balancing"; const showCloseHint = phase === "drawing" && verts.length >= 3; const ringPath = pathFrom(pts, closed); const gapFrom = pts[pts.length - 1]; const gapTo = pts[0]; const areaHa = closed ? shoelaceArea(verts) / (pxPerMeter * pxPerMeter) / 10000 : null; const statusText = phase === "drawing" ? verts.length === 0 ? "click to place the first corner" : `placing corners — ${verts.length} placed${showCloseHint ? ", click near the start to close" : ""}` : phase === "unbalanced" ? `traverse closed, 1:${ratioToShow ? Math.round(ratioToShow) : "—"} — balance to close the gap` : phase === "balancing" ? "balancing…" : `closed, 1:${ratioToShow ? Math.round(ratioToShow) : "—"}`; return (

{/* pointer-events-none: this wrapper spans the full canvas so its children can be absolutely positioned at each vertex, but an empty positioned div still counts as a hit-test target for its whole box in Chrome/Safari even with nothing painted in it — left at the default (auto) it silently ate every click meant for the SVG's onCanvasClick rect underneath, so drawing-phase clicks never placed a vertex. Re-enabled per-button below. */}

{pts.map((p, i) => ( ))}

{statusText} {closed && areaHa !== null ? ( {`, area ${areaHa.toFixed(1)} ha`} ) : null}

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