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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Mammotion SVG Map Aligner</title>
<style>
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
body {
font-family: system-ui, sans-serif;
background: #111827;
color: #e5e7eb;
height: 100vh;
display: flex;
flex-direction: column;
overflow: hidden;
}
/* ── header ── */
header {
background: #1f2937;
border-bottom: 1px solid #374151;
padding: 8px 12px;
display: flex;
gap: 10px;
align-items: center;
flex-wrap: wrap;
flex-shrink: 0;
}
header h1 {
font-size: 16px;
font-weight: 700;
color: #60a5fa;
white-space: nowrap;
}
select,
input[type="number"],
input[type="text"] {
background: #374151;
border: 1px solid #4b5563;
color: #e5e7eb;
border-radius: 6px;
padding: 4px 8px;
font-size: 13px;
}
select:focus,
input:focus {
outline: none;
border-color: #60a5fa;
}
button {
background: #2563eb;
border: none;
color: #fff;
border-radius: 6px;
padding: 5px 12px;
font-size: 13px;
cursor: pointer;
transition: background 0.15s;
}
button:hover {
background: #1d4ed8;
}
button.danger {
background: #dc2626;
}
button.danger:hover {
background: #b91c1c;
}
button.secondary {
background: #374151;
}
button.secondary:hover {
background: #4b5563;
}
label {
font-size: 12px;
color: #9ca3af;
}
/* ── main layout ── */
main {
flex: 1;
display: flex;
min-height: 0;
}
/* ── map panel ── */
.map-panel {
flex: 1;
position: relative;
overflow: hidden;
background: #0d1117;
cursor: default;
}
#map-svg {
width: 100%;
height: 100%;
display: block;
}
.map-hint {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
text-align: center;
color: #4b5563;
pointer-events: none;
}
.map-hint h2 {
font-size: 20px;
margin-bottom: 8px;
}
.map-hint p {
font-size: 13px;
}
/* ── drop overlay ── */
.drop-overlay {
position: fixed;
inset: 0;
background: rgba(96, 165, 250, 0.15);
border: 3px dashed #60a5fa;
z-index: 100;
display: none;
align-items: center;
justify-content: center;
font-size: 24px;
color: #60a5fa;
}
.drop-overlay.active {
display: flex;
}
/* ── sidebar ── */
.sidebar {
width: 320px;
display: flex;
flex-direction: column;
background: #1f2937;
border-left: 1px solid #374151;
overflow: hidden;
}
.sidebar-tabs {
display: flex;
border-bottom: 1px solid #374151;
flex-shrink: 0;
}
.tab-btn {
flex: 1;
padding: 8px;
font-size: 13px;
background: none;
border: none;
color: #9ca3af;
cursor: pointer;
border-bottom: 2px solid transparent;
}
.tab-btn.active {
color: #60a5fa;
border-bottom-color: #60a5fa;
}
.tab-content {
display: none;
flex: 1;
overflow-y: auto;
padding: 12px;
flex-direction: column;
gap: 10px;
}
.tab-content.active {
display: flex;
}
/* ── sections ── */
.section {
background: #111827;
border: 1px solid #374151;
border-radius: 8px;
padding: 10px;
}
.section h3 {
font-size: 12px;
font-weight: 600;
text-transform: uppercase;
letter-spacing: 0.05em;
color: #6b7280;
margin-bottom: 8px;
}
.form-row {
display: flex;
align-items: center;
gap: 8px;
margin-bottom: 6px;
}
.form-row label {
min-width: 90px;
font-size: 12px;
color: #9ca3af;
}
.form-row input {
flex: 1;
min-width: 0;
}
.form-row span {
font-size: 11px;
color: #6b7280;
white-space: nowrap;
}
/* ── SVG drop zone ── */
.svg-dropzone {
border: 2px dashed #374151;
border-radius: 8px;
padding: 20px;
text-align: center;
cursor: pointer;
transition: border-color 0.15s;
font-size: 13px;
color: #6b7280;
}
.svg-dropzone:hover,
.svg-dropzone.over {
border-color: #60a5fa;
color: #60a5fa;
}
.svg-dropzone.loaded {
border-color: #22c55e;
color: #22c55e;
}
.svg-dropzone.toobig {
border-color: #dc2626;
color: #dc2626;
}
.svg-size-banner {
border-radius: 6px;
padding: 7px 10px;
font-size: 12px;
margin-top: 6px;
display: none;
}
.svg-size-banner.ok {
display: block;
background: #052e16;
border: 1px solid #22c55e;
color: #86efac;
}
.svg-size-banner.warn {
display: block;
background: #450a0a;
border: 1px solid #dc2626;
color: #fca5a5;
}
/* ── existing SVG list ── */
.svg-item {
background: #1f2937;
border: 1px solid #374151;
border-radius: 6px;
padding: 8px;
margin-bottom: 6px;
font-size: 12px;
}
.svg-item .hash {
font-family: monospace;
color: #60a5fa;
font-size: 11px;
word-break: break-all;
}
.svg-item .area-name {
color: #e5e7eb;
font-weight: 500;
margin-bottom: 3px;
}
.svg-item.disabled {
border-color: #f59e0b;
background: #1c1a0f;
}
.badge {
display: inline-block;
font-size: 10px;
padding: 1px 5px;
border-radius: 3px;
margin-left: 4px;
}
.badge.disabled {
background: #78350f;
color: #fcd34d;
}
.badge.active {
background: #064e3b;
color: #6ee7b7;
}
/* ── code output ── */
#code-output {
font-family: monospace;
font-size: 11px;
background: #030712;
border: 1px solid #374151;
border-radius: 6px;
padding: 10px;
resize: none;
width: 100%;
height: 260px;
color: #86efac;
line-height: 1.5;
}
.copy-row {
display: flex;
gap: 6px;
margin-top: 6px;
}
/* ── status bar ── */
#statusbar {
background: #1f2937;
border-top: 1px solid #374151;
padding: 3px 12px;
font-size: 11px;
color: #6b7280;
flex-shrink: 0;
display: flex;
gap: 16px;
}
#statusbar span {
color: #9ca3af;
}
/* ── map elements ── */
.map-area {
fill-opacity: 0.12;
stroke-width: 1.5;
cursor: pointer;
transition: fill-opacity 0.15s;
}
.map-area:hover {
fill-opacity: 0.25;
}
.map-area.selected {
fill-opacity: 0.3;
stroke-width: 2.5;
}
.map-obstacle {
fill: #ef4444;
fill-opacity: 0.2;
stroke: #ef4444;
stroke-width: 1.5;
}
.map-label {
font-size: 11px;
fill: #e5e7eb;
pointer-events: none;
text-anchor: middle;
dominant-baseline: middle;
}
.map-centroid {
fill: #60a5fa;
pointer-events: none;
}
.svg-tile-preview {
cursor: move;
}
.svg-tile-existing {
cursor: pointer;
}
.grid-line {
stroke: #1e3a5f;
stroke-width: 0.5;
}
.axis-line {
stroke: #1e4a7a;
stroke-width: 1;
}
.scalebar {
stroke: #9ca3af;
stroke-width: 1.5;
}
.drag-handle {
fill: #60a5fa;
stroke: #fff;
stroke-width: 1;
cursor: nw-resize;
}
.rotate-handle {
fill: #f59e0b;
stroke: #fff;
stroke-width: 1;
cursor: crosshair;
}
</style>
</head>
<body>
<!-- global drag-drop overlay -->
<div class="drop-overlay" id="drop-overlay">Drop diagnostic JSON here</div>
<!-- header -->
<header>
<h1>⛳ Mammotion SVG Map Aligner</h1>
<div style="display: flex; gap: 6px; align-items: center">
<button onclick="document.getElementById('json-input').click()">
📂 Load Diagnostic JSON
</button>
<input
type="file"
id="json-input"
accept=".json"
style="display: none"
/>
</div>
<div style="display: flex; gap: 6px; align-items: center">
<label>Device</label>
<select id="device-select" onchange="onDeviceChange()">
<option value="">— select —</option>
</select>
</div>
<div style="display: flex; gap: 6px; align-items: center">
<label>Area</label>
<select id="area-select" onchange="onAreaChange()">
<option value="">— select —</option>
</select>
</div>
<div
style="display: flex; gap: 6px; align-items: center; margin-left: auto"
>
<label style="font-size: 11px; color: #6b7280">Device type</label>
<select id="device-type" onchange="onTransformChange()">
<option value="2.5">Luba 1 / Yuka (2.5 m)</option>
<option value="4.0">Luba 2 (4.0 m)</option>
</select>
</div>
</header>
<!-- main -->
<main>
<!-- map -->
<div class="map-panel" id="map-panel">
<svg id="map-svg" xmlns="http://www.w3.org/2000/svg"></svg>
<div class="map-hint" id="map-hint">
<h2>🗺️ No map loaded</h2>
<p>
Drag & drop a diagnostic JSON file here,<br />or use the "Load"
button above.
</p>
</div>
</div>
<!-- sidebar -->
<div class="sidebar">
<div class="sidebar-tabs">
<button class="tab-btn active" onclick="showTab('place')">
Place SVG
</button>
<button class="tab-btn" onclick="showTab('existing')">
Existing
</button>
<button class="tab-btn" onclick="showTab('code')">Code</button>
</div>
<!-- Place tab -->
<div class="tab-content active" id="tab-place">
<div class="section">
<h3>SVG Source</h3>
<div
class="svg-dropzone"
id="svg-dropzone"
onclick="document.getElementById('svg-file-input').click()"
>
<div id="svg-dz-label">Drop SVG file here or click to browse</div>
</div>
<input
type="file"
id="svg-file-input"
accept=".svg,image/svg+xml"
style="display: none"
/>
<button
class="secondary"
style="width: 100%; margin-top: 6px; font-size: 12px"
onclick="document.getElementById('svg-paste-area').style.display=document.getElementById('svg-paste-area').style.display==='none'?'block':'none'"
>
Paste SVG markup ▾
</button>
<textarea
id="svg-paste-area"
placeholder="<svg …>…</svg>"
style="
display: none;
width: 100%;
height: 80px;
margin-top: 6px;
font-family: monospace;
font-size: 11px;
background: #030712;
color: #86efac;
border: 1px solid #374151;
border-radius: 4px;
padding: 6px;
resize: vertical;
"
oninput="onSvgPaste()"
></textarea>
<div id="svg-size-banner" class="svg-size-banner"></div>
</div>
<div class="section">
<h3>Transform</h3>
<div class="form-row">
<label>X (East) m</label>
<input
type="number"
id="t-x"
step="0.001"
value="0"
oninput="onTransformInput()"
/>
</div>
<div class="form-row">
<label>Y (North) m</label>
<input
type="number"
id="t-y"
step="0.001"
value="0"
oninput="onTransformInput()"
/>
</div>
<div class="form-row">
<label>Scale</label>
<input
type="number"
id="t-scale"
step="0.05"
value="1.0"
min="0.1"
max="10"
oninput="onTransformInput()"
/>
</div>
<div class="form-row">
<label>Rotate (rad)</label>
<input
type="number"
id="t-rotate"
step="0.01"
value="0"
oninput="onTransformInput()"
/>
<span id="rotate-deg">0°</span>
</div>
<div class="form-row">
<label>Base W (m)</label>
<input
type="number"
id="t-bw"
step="0.1"
value="2.5"
min="0.5"
oninput="onTransformInput()"
/>
</div>
<div class="form-row">
<label>Base H (m)</label>
<input
type="number"
id="t-bh"
step="0.1"
value="2.5"
min="0.5"
oninput="onTransformInput()"
/>
</div>
<div class="form-row">
<label>Filename</label>
<input
type="text"
id="t-fname"
value="pattern.svg"
oninput="onTransformInput()"
/>
</div>
<button
onclick="resetToAreaCentroid()"
class="secondary"
style="width: 100%; margin-top: 4px; font-size: 12px"
>
⌖ Snap to area centroid
</button>
</div>
</div>
<!-- Existing tab -->
<div class="tab-content" id="tab-existing">
<div class="section">
<h3>SVG tiles on device</h3>
<div id="existing-svg-list">
<p style="color: #6b7280; font-size: 12px">
Load a diagnostic JSON to see existing SVG tiles.
</p>
</div>
</div>
</div>
<!-- Code tab -->
<div class="tab-content" id="tab-code">
<div class="section">
<h3>Generated Python</h3>
<p style="font-size: 11px; color: #6b7280; margin-bottom: 6px">
Paste into dev_console.py or HA Python console.
</p>
<textarea
id="code-output"
readonly
placeholder="Position an SVG on the map, then code will appear here."
></textarea>
<div class="copy-row">
<button onclick="copyCode()" style="flex: 1">📋 Copy</button>
<select id="code-mode" onchange="generateCode()" style="flex: 1">
<option value="add">ADD (new tile)</option>
<option value="update">UPDATE (existing hash)</option>
</select>
</div>
<div class="form-row" style="margin-top: 8px" id="update-hash-row">
<label>Existing hash</label>
<input
type="text"
id="existing-hash-input"
placeholder="device-assigned hash"
oninput="generateCode()"
/>
</div>
</div>
</div>
</div>
</main>
<div id="statusbar">
<span id="status-coords">Hover map for coordinates</span>
<span id="status-area">No area selected</span>
<span id="status-svg">No SVG loaded</span>
</div>
<script>
"use strict";
// ── Constants ──────────────────────────────────────────────────────────────
const SVG_MAX_BYTES = 10240; // device TSL string length limit (error 6310)
// ── State ──────────────────────────────────────────────────────────────────
let diag = null; // parsed diagnostic JSON (hashes as strings)
let deviceName = "";
let areaHash = ""; // selected area hash string
let areaNames = {}; // hash→name for selected device
let svgContent = ""; // raw SVG markup
let svgFilename = "pattern.svg";
let tform = { x: 0, y: 0, scale: 1.0, rotate: 0.0, bw: 2.5, bh: 2.5 };
let mapT = null; // { ppm, padX, padY, bounds, W, H, toSX, toSY, toMX, toMY }
let dragging = false;
let dragStart = null;
let selectedExistingHash = null; // hash of existing tile being edited
// ── BigInt-safe JSON parse ─────────────────────────────────────────────────
function safeParse(text) {
// Wrap large integers (≥16 digits) that are standalone JSON values in quotes.
// Must exclude:
// - preceded by '.' → fractional part of a float (e.g. -2.5552389621734620)
// - followed by '.' or 'e'/'E' → integer part of a float (e.g. 1234567890.5)
const patched = text.replace(
/(?<!["\w.])(-?\d{16,})(?!["\d.eE])/g,
'"$1"',
);
return JSON.parse(patched);
}
// ── File loading ───────────────────────────────────────────────────────────
function loadJsonText(text) {
try {
diag = safeParse(text);
} catch (e) {
alert("Failed to parse JSON: " + e.message);
return;
}
const deviceData = diag.data || {};
const deviceSel = document.getElementById("device-select");
deviceSel.innerHTML = '<option value="">— select —</option>';
for (const [name, data] of Object.entries(deviceData)) {
const areas = data?.map?.area;
if (!areas || Object.keys(areas).length === 0) continue;
const opt = document.createElement("option");
opt.value = name;
opt.textContent = name;
deviceSel.appendChild(opt);
}
document.getElementById("map-hint").style.display = "none";
setStatus(
"status-coords",
`Loaded ${Object.keys(deviceData).length} devices`,
);
}
document.getElementById("json-input").addEventListener("change", (e) => {
const f = e.target.files[0];
if (!f) return;
const r = new FileReader();
r.onload = (ev) => loadJsonText(ev.target.result);
r.readAsText(f);
e.target.value = "";
});
// SVG file input
document
.getElementById("svg-file-input")
.addEventListener("change", (e) => {
const f = e.target.files[0];
if (!f) return;
svgFilename = f.name;
document.getElementById("t-fname").value = svgFilename;
const r = new FileReader();
r.onload = (ev) => {
svgContent = ev.target.result;
onSvgLoaded();
};
r.readAsText(f);
e.target.value = "";
});
function onSvgPaste() {
const v = document.getElementById("svg-paste-area").value.trim();
if (v.startsWith("<svg")) {
svgContent = v;
onSvgLoaded();
}
}
function onSvgLoaded() {
const dz = document.getElementById("svg-dropzone");
const banner = document.getElementById("svg-size-banner");
const bytes = new TextEncoder().encode(svgContent).length;
const pct = Math.round((bytes / SVG_MAX_BYTES) * 100);
dz.classList.remove("loaded", "toobig");
if (bytes > SVG_MAX_BYTES) {
dz.classList.add("toobig");
document.getElementById("svg-dz-label").textContent =
"⚠ SVG too large — simplify before sending";
banner.className = "svg-size-banner warn";
banner.innerHTML = `<strong>SVG exceeds device limit (${bytes.toLocaleString()} / ${SVG_MAX_BYTES.toLocaleString()} bytes, ${pct}%)</strong><br>
The device will reject with error 6310 (string length > max 10240).<br>
<small>Try: remove comments & metadata, simplify paths, strip unused attributes.</small>`;
setStatus(
"status-svg",
`⚠ SVG too large: ${bytes} / ${SVG_MAX_BYTES} bytes`,
);
} else {
dz.classList.add("loaded");
document.getElementById("svg-dz-label").textContent =
"✓ SVG loaded — drag on map to position";
banner.className = "svg-size-banner ok";
banner.textContent = `${bytes.toLocaleString()} / ${SVG_MAX_BYTES.toLocaleString()} bytes (${pct}%)`;
setStatus("status-svg", `SVG loaded (${bytes} bytes)`);
}
renderMap();
generateCode();
}
// ── Global drag-drop for diagnostic JSON ──────────────────────────────────
const dropOverlay = document.getElementById("drop-overlay");
let dropCounter = 0;
document.addEventListener("dragenter", (e) => {
e.preventDefault();
dropCounter++;
dropOverlay.classList.add("active");
});
document.addEventListener("dragleave", () => {
if (--dropCounter <= 0) {
dropCounter = 0;
dropOverlay.classList.remove("active");
}
});
document.addEventListener("dragover", (e) => e.preventDefault());
document.addEventListener("drop", (e) => {
e.preventDefault();
dropCounter = 0;
dropOverlay.classList.remove("active");
const file = e.dataTransfer.files[0];
if (!file) return;
const r = new FileReader();
r.onload = (ev) => {
if (file.name.endsWith(".json")) loadJsonText(ev.target.result);
else if (
file.name.endsWith(".svg") ||
file.type === "image/svg+xml"
) {
svgFilename = file.name;
document.getElementById("t-fname").value = svgFilename;
svgContent = ev.target.result;
onSvgLoaded();
}
};
r.readAsText(file);
});
// SVG drop zone
const svgDz = document.getElementById("svg-dropzone");
svgDz.addEventListener("dragover", (e) => {
e.preventDefault();
e.stopPropagation();
svgDz.classList.add("over");
});
svgDz.addEventListener("dragleave", () => svgDz.classList.remove("over"));
svgDz.addEventListener("drop", (e) => {
e.preventDefault();
e.stopPropagation();
svgDz.classList.remove("over");
const file = e.dataTransfer.files[0];
if (!file) return;
svgFilename = file.name;
document.getElementById("t-fname").value = svgFilename;
const r = new FileReader();
r.onload = (ev) => {
svgContent = ev.target.result;
onSvgLoaded();
};
r.readAsText(file);
});
// ── Device / area selection ────────────────────────────────────────────────
function onDeviceChange() {
deviceName = document.getElementById("device-select").value;
const areaSel = document.getElementById("area-select");
areaSel.innerHTML = '<option value="">— select area —</option>';
areaHash = "";
areaNames = {};
if (!deviceName || !diag?.data?.[deviceName]) {
renderMap();
return;
}
const mapData = diag.data[deviceName].map || {};
// Build name lookup
for (const an of mapData.area_name || []) {
areaNames[String(an.hash)] = an.name;
}
// Populate area selector
for (const hash of Object.keys(mapData.area || {})) {
const opt = document.createElement("option");
opt.value = hash;
opt.textContent = areaNames[hash] || "Area " + hash.slice(-6);
areaSel.appendChild(opt);
}
populateExistingSvgs();
renderMap();
}
function onAreaChange() {
areaHash = document.getElementById("area-select").value;
if (areaHash) {
resetToAreaCentroid();
setStatus("status-area", areaNames[areaHash] || areaHash);
}
renderMap();
generateCode();
}
// ── Transform controls ─────────────────────────────────────────────────────
function onTransformInput() {
tform.x = parseFloat(document.getElementById("t-x").value) || 0;
tform.y = parseFloat(document.getElementById("t-y").value) || 0;
tform.scale = parseFloat(document.getElementById("t-scale").value) || 1;
tform.rotate =
parseFloat(document.getElementById("t-rotate").value) || 0;
tform.bw = parseFloat(document.getElementById("t-bw").value) || 2.5;
tform.bh = parseFloat(document.getElementById("t-bh").value) || 2.5;
const deg = ((tform.rotate * 180) / Math.PI).toFixed(1);
document.getElementById("rotate-deg").textContent = deg + "°";
updateSvgTilePreview();
generateCode();
}
function onTransformChange() {
const bm = parseFloat(document.getElementById("device-type").value);
document.getElementById("t-bw").value = bm;
document.getElementById("t-bh").value = bm;
tform.bw = bm;
tform.bh = bm;
updateSvgTilePreview();
generateCode();
}
function syncFormFromTform() {
document.getElementById("t-x").value = tform.x.toFixed(4);
document.getElementById("t-y").value = tform.y.toFixed(4);
document.getElementById("t-scale").value = tform.scale.toFixed(3);
document.getElementById("t-rotate").value = tform.rotate.toFixed(4);
document.getElementById("t-bw").value = tform.bw;
document.getElementById("t-bh").value = tform.bh;
document.getElementById("rotate-deg").textContent =
((tform.rotate * 180) / Math.PI).toFixed(1) + "°";
}
// ── Area boundary helpers ──────────────────────────────────────────────────
function getAreaPoints(areaData) {
const frames = (areaData.data || []).slice();
frames.sort((a, b) => (a.current_frame || 0) - (b.current_frame || 0));
const pts = [];
for (const fr of frames)
for (const pt of fr.data_couple || []) pts.push(pt);
return pts;
}
function centroid(pts) {
const n = pts.length;
if (n === 0) return { x: 0, y: 0 };
if (n === 1) return { x: pts[0].x, y: pts[0].y };
let A = 0,
cx = 0,
cy = 0;
for (let i = 0; i < n; i++) {
const j = (i + 1) % n;
const cross = pts[i].x * pts[j].y - pts[j].x * pts[i].y;
A += cross;
cx += (pts[i].x + pts[j].x) * cross;
cy += (pts[i].y + pts[j].y) * cross;
}
A *= 0.5;
if (Math.abs(A) < 1e-10)
return {
x: pts.reduce((s, p) => s + p.x, 0) / n,
y: pts.reduce((s, p) => s + p.y, 0) / n,
};
return { x: cx / (6 * A), y: cy / (6 * A) };
}
function resetToAreaCentroid() {
if (!areaHash || !deviceName) return;
const areaData = diag?.data?.[deviceName]?.map?.area?.[areaHash];
if (!areaData) return;
const pts = getAreaPoints(areaData);
const c = centroid(pts);
tform.x = parseFloat(c.x.toFixed(4));
tform.y = parseFloat(c.y.toFixed(4));
syncFormFromTform();
updateSvgTilePreview();
generateCode();
}
// ── Map rendering ──────────────────────────────────────────────────────────
const AREA_COLORS = [
"#22c55e",
"#3b82f6",
"#f59e0b",
"#a855f7",
"#14b8a6",
"#f97316",
"#ec4899",
"#84cc16",
];
function computeMapTransform(mapData, W, H) {
const areas = mapData.area || {};
const obstacles = mapData.obstacle || {};
const allPts = [];
for (const v of Object.values(areas)) allPts.push(...getAreaPoints(v));
for (const v of Object.values(obstacles))
allPts.push(...getAreaPoints(v));
if (allPts.length === 0) return null;
const minX = Math.min(...allPts.map((p) => p.x));
const maxX = Math.max(...allPts.map((p) => p.x));
const minY = Math.min(...allPts.map((p) => p.y));
const maxY = Math.max(...allPts.map((p) => p.y));
const pad = Math.max(maxX - minX, maxY - minY) * 0.08 + 1;
const b = {
minX: minX - pad,
maxX: maxX + pad,
minY: minY - pad,
maxY: maxY + pad,
};
const ppm = Math.min(W / (b.maxX - b.minX), H / (b.maxY - b.minY));
const padX = (W - (b.maxX - b.minX) * ppm) / 2;
const padY = (H - (b.maxY - b.minY) * ppm) / 2;
const toSX = (mx) => padX + (mx - b.minX) * ppm;
const toSY = (my) => H - padY - (my - b.minY) * ppm; // flip Y
const toMX = (sx) => (sx - padX) / ppm + b.minX;
const toMY = (sy) => (H - sy - padY) / ppm + b.minY;