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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Dual Pane Annotation Tool</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: "Segoe UI", Tahoma, sans-serif;
background: #f4f7fb;
color: #1f2937;
}
.header {
background: #0f172a;
color: #fff;
padding: 10px 14px;
display: flex;
align-items: center;
gap: 10px;
flex-wrap: wrap;
}
.header .group {
display: flex;
align-items: center;
gap: 8px;
}
.header button,
.header input[type="file"] {
border: 1px solid #334155;
border-radius: 6px;
background: #1e293b;
color: #fff;
padding: 7px 10px;
cursor: pointer;
}
.header button:disabled {
opacity: 0.45;
cursor: not-allowed;
}
.header .primary {
background: #0369a1;
border-color: #0284c7;
}
.header .finished {
border: 1px solid #334155;
border-radius: 6px;
background: #1e293b;
color: #fff;
padding: 7px 10px;
cursor: pointer;
user-select: none;
}
.header .finished input {
margin-right: 6px;
}
.header .finished.disabled {
opacity: 0.45;
cursor: not-allowed;
}
.header .status {
margin-left: auto;
font-size: 13px;
color: #cbd5e1;
}
.main {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 10px;
padding: 10px;
height: calc(100vh - 66px);
}
.pane {
display: flex;
flex-direction: column;
background: #fff;
border: 1px solid #dbe3ec;
border-radius: 8px;
overflow: hidden;
min-height: 0;
}
.pane-title {
background: #e2e8f0;
padding: 9px 12px;
font-weight: 700;
font-size: 14px;
}
.toolbar {
padding: 6px;
display: flex;
align-items: center;
flex-wrap: nowrap;
gap: 5px;
background: #f8fafc;
border-top: 1px solid #e2e8f0;
border-bottom: 1px solid #e2e8f0;
min-height: 42px;
overflow-x: auto;
overflow-y: hidden;
scrollbar-width: thin;
}
.toolbar button {
background: #fff;
color: #111827;
border-color: #cbd5e1;
border: 1px solid #cbd5e1;
border-radius: 6px;
padding: 5px 8px;
cursor: pointer;
flex: 0 0 auto;
font-size: 13px;
line-height: 1.1;
white-space: nowrap;
}
.toolbar button.active {
background: #0ea5e9;
color: #fff;
border-color: #0284c7;
}
.size {
display: inline-flex;
align-items: center;
border: 1px solid #cbd5e1;
border-radius: 6px;
overflow: hidden;
flex: 0 0 auto;
height: 30px;
}
.size button {
border: none;
border-radius: 0;
}
.size .value {
min-width: 34px;
text-align: center;
font-size: 13px;
font-weight: 700;
padding: 0 6px;
}
.opacity-control {
display: inline-flex;
align-items: center;
gap: 6px;
border: 1px solid #cbd5e1;
border-radius: 6px;
background: #fff;
padding: 4px 6px;
font-size: 13px;
font-weight: 700;
flex: 0 0 auto;
height: 30px;
white-space: nowrap;
}
.opacity-control input {
width: 74px;
accent-color: #0ea5e9;
}
.opacity-control .value {
min-width: 32px;
text-align: right;
}
.canvas-wrap {
position: relative;
flex: 1;
min-height: 0;
background: linear-gradient(
45deg,
#f8fafc 25%,
#f1f5f9 25%,
#f1f5f9 50%,
#f8fafc 50%,
#f8fafc 75%,
#f1f5f9 75%
);
background-size: 18px 18px;
}
canvas {
position: absolute;
inset: 0;
width: 100%;
height: 100%;
touch-action: none;
}
.cursor-indicator {
position: absolute;
left: 0;
top: 0;
transform: translate(-9999px, -9999px);
border: 2px solid #0ea5e9;
border-radius: 999px;
pointer-events: none;
z-index: 5;
display: none;
box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.9);
}
.cursor-indicator.eraser {
border-color: #ef4444;
}
.cursor-indicator.dot {
width: 6px;
height: 6px;
border: none;
background: #2563eb;
box-shadow: none;
}
.info-toggle {
position: absolute;
right: 8px;
top: 8px;
width: 28px;
height: 28px;
border: 1px solid rgba(15, 23, 42, 0.28);
border-radius: 6px;
background: rgba(255, 255, 255, 0.92);
color: #0f172a;
font-weight: 800;
cursor: pointer;
z-index: 6;
}
.info-toggle.active {
background: #0ea5e9;
border-color: #0284c7;
color: #fff;
}
.hint {
position: absolute;
top: 44px;
right: 8px;
max-width: min(360px, calc(100% - 16px));
background: rgba(15, 23, 42, 0.78);
color: #e2e8f0;
font-size: 12px;
border-radius: 6px;
padding: 6px 8px;
pointer-events: auto;
z-index: 6;
display: none;
}
.canvas-wrap.show-hint .hint {
display: block;
}
@media (max-width: 980px) {
.main {
grid-template-columns: 1fr;
height: auto;
min-height: calc(100vh - 66px);
}
.pane {
height: 65vh;
}
.header .status {
width: 100%;
margin-left: 0;
}
}
</style>
</head>
<body>
<header class="header">
<div class="group">
<label for="fileInput">Images</label>
<input id="fileInput" type="file" accept="image/*" multiple />
</div>
<div class="group">
<button id="prevBtn" type="button">Previous</button>
<button id="nextBtn" type="button">Next</button>
</div>
<div class="group">
<button id="saveCurrentBtn" class="primary" type="button">
Save Current Masks
</button>
<button id="saveAllBtn" type="button">Save All Masks</button>
</div>
<label id="finishedLabel" class="finished">
<input id="finishedCheckbox" type="checkbox" />
Annotated
</label>
<div id="status" class="status">Load one or more images to begin.</div>
</header>
<main class="main">
<section class="pane">
<div class="pane-title">Left Pane: Brush/Eraser</div>
<div class="toolbar" id="leftToolbar">
<button id="leftBrush" type="button">Brush</button>
<button id="leftEraser" type="button">Eraser</button>
<button id="leftSelect" type="button">Select</button>
<button id="leftPan" type="button">Pan</button>
<button id="leftUndo" type="button">Undo</button>
<button id="leftRedo" type="button">Redo</button>
<div class="size">
<button id="leftSizeMinus" type="button">-</button>
<div id="leftSizeValue" class="value">8</div>
<button id="leftSizePlus" type="button">+</button>
</div>
<label class="opacity-control" for="leftOpacity">
Opacity
<input id="leftOpacity" type="range" min="0" max="100" value="45" />
<span id="leftOpacityValue" class="value">45%</span>
</label>
</div>
<div class="canvas-wrap" id="leftWrap">
<canvas id="leftCanvas"></canvas>
<div id="leftCursor" class="cursor-indicator"></div>
<button
id="leftInfo"
class="info-toggle"
type="button"
aria-expanded="false"
aria-controls="leftHint"
title="Brush help"
>
i
</button>
<div id="leftHint" class="hint">
Shortcuts: B brush, E eraser, S select, M pan, [ / ] brush size,
Ctrl+Z/Ctrl+Y, Delete selected stroke
</div>
</div>
</section>
<section class="pane">
<div class="pane-title">Right Pane: Polygon</div>
<div class="toolbar" id="rightToolbar">
<button id="rightPolygon" type="button">Polygon</button>
<button id="rightSelect" type="button">Select</button>
<button id="rightPan" type="button">Pan</button>
<button id="rightUndo" type="button">Undo</button>
<button id="rightRedo" type="button">Redo</button>
<label class="opacity-control" for="rightOpacity">
Opacity
<input
id="rightOpacity"
type="range"
min="0"
max="100"
value="30"
/>
<span id="rightOpacityValue" class="value">30%</span>
</label>
</div>
<div class="canvas-wrap" id="rightWrap">
<canvas id="rightCanvas"></canvas>
<div id="rightCursor" class="cursor-indicator dot"></div>
<button
id="rightInfo"
class="info-toggle"
type="button"
aria-expanded="false"
aria-controls="rightHint"
title="Polygon help"
>
i
</button>
<div id="rightHint" class="hint">
Shortcuts: P polygon, S select, M pan, Space or first-vertex click
to finish. Hold Shift and drag with left mouse to place continuous
vertices. Drag selected vertices to edit. Double-click edge to add
vertex. Right-click vertex to delete.
</div>
</div>
</section>
</main>
<script>
(function () {
const fileInput = document.getElementById("fileInput");
const prevBtn = document.getElementById("prevBtn");
const nextBtn = document.getElementById("nextBtn");
const saveCurrentBtn = document.getElementById("saveCurrentBtn");
const saveAllBtn = document.getElementById("saveAllBtn");
const finishedLabel = document.getElementById("finishedLabel");
const finishedCheckbox = document.getElementById("finishedCheckbox");
const statusEl = document.getElementById("status");
const leftSizeValue = document.getElementById("leftSizeValue");
const leftOpacity = document.getElementById("leftOpacity");
const leftOpacityValue = document.getElementById("leftOpacityValue");
const rightOpacity = document.getElementById("rightOpacity");
const rightOpacityValue = document.getElementById("rightOpacityValue");
const leftInfo = document.getElementById("leftInfo");
const rightInfo = document.getElementById("rightInfo");
const deepCopy = (obj) => JSON.parse(JSON.stringify(obj));
const app = {
images: [],
index: -1,
activePane: "left",
left: createPane(
"left",
document.getElementById("leftCanvas"),
document.getElementById("leftWrap"),
),
right: createPane(
"right",
document.getElementById("rightCanvas"),
document.getElementById("rightWrap"),
),
};
app.left.cursorEl = document.getElementById("leftCursor");
app.right.cursorEl = document.getElementById("rightCursor");
function createPane(kind, canvas, wrap) {
return {
kind,
canvas,
wrap,
ctx: canvas.getContext("2d"),
tool: kind === "left" ? "brush" : "polygon",
brushSize: 8,
opacity: kind === "left" ? 0.45 : 0.3,
view: { scale: 1, offsetX: 0, offsetY: 0 },
interaction: {
pointerId: null,
drawing: false,
panning: false,
draggingStroke: false,
draggingVertex: false,
draggingPolygon: false,
continuousPolygon: false,
moved: false,
lastScreen: null,
lastImage: null,
hoverScreen: null,
lastEdgeClickAt: 0,
lastEdgeClickPoint: null,
lastEdgeClickPolygon: -1,
},
};
}
function currentImage() {
return app.images[app.index] || null;
}
function ensureImageData(imageRec) {
if (typeof imageRec.finished !== "boolean") {
imageRec.finished = false;
}
if (!imageRec.left) {
imageRec.left = {
strokes: [],
selectedStroke: -1,
history: { undo: [deepCopy({ strokes: [] })], redo: [] },
};
}
if (!imageRec.right) {
imageRec.right = {
polygons: [],
draft: [],
selectedPolygon: -1,
selectedVertex: -1,
history: { undo: [deepCopy({ polygons: [] })], redo: [] },
};
}
}
function syncButtons() {
const hasImages = app.images.length > 0;
prevBtn.disabled = !hasImages || app.index <= 0;
nextBtn.disabled = !hasImages || app.index >= app.images.length - 1;
saveCurrentBtn.disabled = !hasImages;
saveAllBtn.disabled = !hasImages;
finishedCheckbox.disabled = !hasImages;
finishedLabel.classList.toggle("disabled", !hasImages);
finishedCheckbox.checked = Boolean(currentImage()?.finished);
const left = app.left;
const right = app.right;
setActive("leftBrush", left.tool === "brush");
setActive("leftEraser", left.tool === "eraser");
setActive("leftSelect", left.tool === "select");
setActive("leftPan", left.tool === "pan");
setActive("rightPolygon", right.tool === "polygon");
setActive("rightSelect", right.tool === "select");
setActive("rightPan", right.tool === "pan");
leftSizeValue.textContent = String(left.brushSize);
leftOpacity.value = String(Math.round(left.opacity * 100));
leftOpacityValue.textContent = Math.round(left.opacity * 100) + "%";
rightOpacity.value = String(Math.round(right.opacity * 100));
rightOpacityValue.textContent = Math.round(right.opacity * 100) + "%";
updatePaneCursor(app.left, app.left.interaction.hoverScreen);
updatePaneCursor(app.right, app.right.interaction.hoverScreen);
}
function shouldUseCustomCursor(pane) {
if (pane.kind === "left") {
return pane.tool === "brush" || pane.tool === "eraser";
}
return pane.tool === "polygon";
}
function updatePaneCursor(pane, screenPoint, forceHide) {
const cursorEl = pane.cursorEl;
if (!cursorEl) {
return;
}
if (forceHide || !shouldUseCustomCursor(pane) || !screenPoint) {
cursorEl.style.display = "none";
pane.canvas.style.cursor = "default";
return;
}
pane.canvas.style.cursor = "none";
cursorEl.style.display = "block";
cursorEl.classList.remove("eraser", "dot");
if (pane.kind === "left") {
const sizePx = Math.max(4, pane.brushSize * pane.view.scale);
cursorEl.style.width = sizePx + "px";
cursorEl.style.height = sizePx + "px";
if (pane.tool === "eraser") {
cursorEl.classList.add("eraser");
}
} else {
cursorEl.style.width = "10px";
cursorEl.style.height = "10px";
cursorEl.classList.add("dot");
}
cursorEl.style.transform =
"translate(" +
screenPoint.x +
"px, " +
screenPoint.y +
"px) translate(-50%, -50%)";
}
function setActive(id, active) {
const el = document.getElementById(id);
if (!el) {
return;
}
el.classList.toggle("active", active);
}
function setStatus(text) {
statusEl.textContent = text;
}
function updateStatusFromImage() {
const img = currentImage();
if (!img) {
setStatus("Load one or more images to begin.");
return;
}
setStatus(
"Image " +
(app.index + 1) +
" / " +
app.images.length +
" - " +
img.name +
(img.finished ? " - annotated" : ""),
);
}
function clamp(v, min, max) {
return Math.max(min, Math.min(max, v));
}
function resizePaneCanvas(pane) {
const rect = pane.wrap.getBoundingClientRect();
const dpr = window.devicePixelRatio || 1;
const width = Math.max(1, Math.floor(rect.width));
const height = Math.max(1, Math.floor(rect.height));
pane.canvas.width = Math.floor(width * dpr);
pane.canvas.height = Math.floor(height * dpr);
pane.ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
}
function fitImageInPane(pane, imageRec) {
resizePaneCanvas(pane);
const w = pane.wrap.clientWidth;
const h = pane.wrap.clientHeight;
const scale =
Math.min(w / imageRec.width, h / imageRec.height) * 0.96;
pane.view.scale = Math.max(scale, 0.05);
pane.view.offsetX = (w - imageRec.width * pane.view.scale) / 2;
pane.view.offsetY = (h - imageRec.height * pane.view.scale) / 2;
}
function screenToImage(pane, screenPoint) {
return {
x: (screenPoint.x - pane.view.offsetX) / pane.view.scale,
y: (screenPoint.y - pane.view.offsetY) / pane.view.scale,
};
}
function imageToScreen(pane, imagePoint) {
return {
x: imagePoint.x * pane.view.scale + pane.view.offsetX,
y: imagePoint.y * pane.view.scale + pane.view.offsetY,
};
}
function isPointInImageBounds(imageRec, pt) {
return (
pt.x >= 0 &&
pt.y >= 0 &&
pt.x <= imageRec.width &&
pt.y <= imageRec.height
);
}
function loadFiles(files) {
const list = Array.from(files || []);
if (!list.length) {
return;
}
app.images.forEach((img) => {
if (img.url) {
URL.revokeObjectURL(img.url);
}
});
Promise.all(list.map((file) => loadSingleImage(file)))
.then((items) => {
app.images = items;
app.index = 0;
app.images.forEach(ensureImageData);
const img = currentImage();
fitImageInPane(app.left, img);
fitImageInPane(app.right, img);
syncButtons();
updateStatusFromImage();
drawAll();
})
.catch((err) => {
setStatus("Failed to load images: " + err.message);
});
}
function loadSingleImage(file) {
return new Promise((resolve, reject) => {
const url = URL.createObjectURL(file);
const img = new Image();
img.onload = () => {
resolve({
name: file.name,
url,
image: img,
width: img.naturalWidth,
height: img.naturalHeight,
});
};
img.onerror = () => {
URL.revokeObjectURL(url);
reject(new Error("Could not read " + file.name));
};
img.src = url;
});
}
function goToImage(nextIndex) {
if (!app.images.length) {
return;
}
app.index = clamp(nextIndex, 0, app.images.length - 1);
const img = currentImage();
ensureImageData(img);
fitImageInPane(app.left, img);
fitImageInPane(app.right, img);
syncButtons();
updateStatusFromImage();
drawAll();
}
function pushHistory(kind) {
const img = currentImage();
if (!img) {
return;
}
ensureImageData(img);
if (kind === "left") {
const snap = deepCopy({ strokes: img.left.strokes });
img.left.history.undo.push(snap);
img.left.history.redo = [];
} else {
const snap = deepCopy({ polygons: img.right.polygons });
img.right.history.undo.push(snap);
img.right.history.redo = [];
}
}
function undo(kind) {
const img = currentImage();
if (!img) {
return;
}
if (
kind === "right" &&
app.right.tool === "polygon" &&
img.right.draft.length > 0
) {
img.right.draft.pop();
drawAll();
return;
}
const bucket = kind === "left" ? img.left : img.right;
if (bucket.history.undo.length <= 1) {
return;
}
const current = bucket.history.undo.pop();
bucket.history.redo.push(current);
const prev = deepCopy(
bucket.history.undo[bucket.history.undo.length - 1],
);
if (kind === "left") {
img.left.strokes = prev.strokes;
img.left.selectedStroke = -1;
} else {
img.right.polygons = prev.polygons;
img.right.selectedPolygon = -1;
img.right.selectedVertex = -1;
}
drawAll();
}
function redo(kind) {
const img = currentImage();
if (!img) {
return;
}
const bucket = kind === "left" ? img.left : img.right;
if (!bucket.history.redo.length) {
return;
}
const next = deepCopy(bucket.history.redo.pop());
bucket.history.undo.push(deepCopy(next));
if (kind === "left") {
img.left.strokes = next.strokes;
img.left.selectedStroke = -1;
} else {
img.right.polygons = next.polygons;
img.right.selectedPolygon = -1;
img.right.selectedVertex = -1;
}
drawAll();
}
function drawAll() {
drawPane(app.left);
drawPane(app.right);
}
function drawPane(pane) {
const ctx = pane.ctx;
const w = pane.wrap.clientWidth;
const h = pane.wrap.clientHeight;
ctx.clearRect(0, 0, w, h);
const imgRec = currentImage();
if (!imgRec) {
ctx.fillStyle = "#64748b";
ctx.font = "15px Segoe UI";
ctx.fillText("Load images to start annotating.", 20, 30);
return;
}
ctx.save();
ctx.translate(pane.view.offsetX, pane.view.offsetY);
ctx.scale(pane.view.scale, pane.view.scale);
ctx.drawImage(imgRec.image, 0, 0);
if (pane.kind === "left") {
drawLeftAnnotations(ctx, imgRec);
} else {
drawRightAnnotations(ctx, imgRec);
}
ctx.restore();
}
function drawLeftAnnotations(ctx, imgRec) {
const overlay = document.createElement("canvas");
overlay.width = imgRec.width;
overlay.height = imgRec.height;
const octx = overlay.getContext("2d");
function drawStroke(targetCtx, stroke) {
if (!stroke || stroke.points.length < 1) {
return;
}
targetCtx.save();
targetCtx.lineCap = "round";
targetCtx.lineJoin = "round";
targetCtx.lineWidth = stroke.size;
if (stroke.mode === "erase") {
targetCtx.globalCompositeOperation = "destination-out";
targetCtx.strokeStyle = "rgba(0,0,0,1)";
} else {
targetCtx.globalCompositeOperation = "source-over";
targetCtx.strokeStyle = "rgba(255,255,255,1)";
}
targetCtx.beginPath();
targetCtx.moveTo(stroke.points[0].x, stroke.points[0].y);
for (let p = 1; p < stroke.points.length; p += 1) {
targetCtx.lineTo(stroke.points[p].x, stroke.points[p].y);
}
if (stroke.points.length === 1) {
targetCtx.lineTo(
stroke.points[0].x + 0.01,
stroke.points[0].y + 0.01,
);
}
targetCtx.stroke();
targetCtx.restore();
}
for (let i = 0; i < imgRec.left.strokes.length; i += 1) {
drawStroke(octx, imgRec.left.strokes[i]);
}
drawStroke(octx, imgRec.left.currentStroke);
const tint = document.createElement("canvas");
tint.width = imgRec.width;
tint.height = imgRec.height;
const tctx = tint.getContext("2d");
tctx.fillStyle = "rgba(255, 0, 0, " + app.left.opacity + ")";
tctx.fillRect(0, 0, tint.width, tint.height);
tctx.globalCompositeOperation = "destination-in";
tctx.drawImage(overlay, 0, 0);
ctx.drawImage(tint, 0, 0);
if (imgRec.left.selectedStroke >= 0) {
const selected = imgRec.left.strokes[imgRec.left.selectedStroke];
if (selected && selected.points.length) {
ctx.save();
ctx.strokeStyle = "#fde047";
ctx.lineWidth = Math.max(2 / app.left.view.scale, 1);
ctx.beginPath();
ctx.moveTo(selected.points[0].x, selected.points[0].y);
for (let i = 1; i < selected.points.length; i += 1) {
ctx.lineTo(selected.points[i].x, selected.points[i].y);
}
ctx.stroke();
ctx.restore();
}
}
}
function drawRightAnnotations(ctx, imgRec) {
const right = imgRec.right;
const previewPoint =
right.draft.length && app.right.interaction.hoverScreen
? screenToImage(app.right, app.right.interaction.hoverScreen)
: null;
for (let i = 0; i < right.polygons.length; i += 1) {
const poly = right.polygons[i];
if (!poly.points.length) {
continue;
}
ctx.save();
ctx.beginPath();
ctx.moveTo(poly.points[0].x, poly.points[0].y);
for (let p = 1; p < poly.points.length; p += 1) {
ctx.lineTo(poly.points[p].x, poly.points[p].y);
}
ctx.closePath();
ctx.fillStyle =
i === right.selectedPolygon
? "rgba(245, 158, 11, " + app.right.opacity + ")"
: "rgba(16, 185, 129, " + app.right.opacity + ")";
ctx.strokeStyle =
i === right.selectedPolygon ? "#f59e0b" : "#10b981";
ctx.lineWidth = Math.max(2 / app.right.view.scale, 1);
ctx.fill();
ctx.stroke();
ctx.restore();
}
if (right.draft.length) {
ctx.save();
ctx.strokeStyle = "#2563eb";
ctx.lineWidth = Math.max(2 / app.right.view.scale, 1);
ctx.beginPath();
ctx.moveTo(right.draft[0].x, right.draft[0].y);
for (let i = 1; i < right.draft.length; i += 1) {
ctx.lineTo(right.draft[i].x, right.draft[i].y);
}
if (previewPoint) {
ctx.lineTo(previewPoint.x, previewPoint.y);
}
ctx.stroke();
for (let i = 0; i < right.draft.length; i += 1) {
drawVertex(ctx, right.draft[i], "#c2410c", app.right.view.scale);
}
ctx.restore();
}
if (right.selectedPolygon >= 0) {
const poly = right.polygons[right.selectedPolygon];
if (poly) {
for (let i = 0; i < poly.points.length; i += 1) {
const color = "#c2410c";
drawVertex(ctx, poly.points[i], color, app.right.view.scale);
}
}
}
}
function drawVertex(ctx, point, color, scale) {
ctx.save();
ctx.fillStyle = color;
ctx.beginPath();
ctx.arc(
point.x,
point.y,
Math.max(2.5 / scale, 1.25),
0,
Math.PI * 2,
);
ctx.fill();
ctx.restore();
}
function distancePointSegment(point, a, b) {
const abx = b.x - a.x;
const aby = b.y - a.y;
const apx = point.x - a.x;
const apy = point.y - a.y;
const d = abx * abx + aby * aby;
if (d === 0) {
return Math.hypot(point.x - a.x, point.y - a.y);
}
const t = clamp((apx * abx + apy * aby) / d, 0, 1);
const cx = a.x + abx * t;
const cy = a.y + aby * t;
return Math.hypot(point.x - cx, point.y - cy);
}
function findStrokeAt(imgRec, point) {
for (let i = imgRec.left.strokes.length - 1; i >= 0; i -= 1) {
const s = imgRec.left.strokes[i];
const threshold = Math.max(6, s.size * 0.8);
if (s.points.length === 1) {
if (
Math.hypot(point.x - s.points[0].x, point.y - s.points[0].y) <=
threshold
) {
return i;
}
} else {
for (let p = 0; p < s.points.length - 1; p += 1) {
if (
distancePointSegment(point, s.points[p], s.points[p + 1]) <=
threshold