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const { app } = window.comfyAPI.app;
// --- begin context window math (port of comfy/context_windows.py) ---
const MAX_WINDOWS = 512;
const TRUNC_MSG = `too many windows, truncated at ${MAX_WINDOWS}`;
function capReached(windows, errors) {
if (windows.length < MAX_WINDOWS) return false;
errors.push(TRUNC_MSG);
return true;
}
function pythonRound(x) {
// python round() is half-even
const floor = Math.floor(x);
const diff = x - floor;
if (diff > 0.5) return floor + 1;
if (diff < 0.5) return floor;
return floor % 2 === 0 ? floor : floor + 1;
}
function orderedHalving(val) {
const bin = BigInt(val).toString(2).padStart(64, '0').split('').reverse().join('');
return Number(BigInt('0b' + bin)) / 18446744073709551616;
}
function range(start, stop) {
const out = [];
for (let i = start; i < stop; i++) out.push(i);
return out;
}
// loop min/max; avoids Math.min(...arr) spread-limit crash on long windows
function arrMin(a) {
let m = Infinity;
for (let i = 0; i < a.length; i++) if (a[i] < m) m = a[i];
return m;
}
function arrMax(a) {
let m = -Infinity;
for (let i = 0; i < a.length; i++) if (a[i] > m) m = a[i];
return m;
}
function arraysEqual(a, b) {
if (a.length !== b.length) return false;
for (let i = 0; i < a.length; i++) if (a[i] !== b[i]) return false;
return true;
}
function doesWindowRollOver(window, numFrames) {
let prev = -1;
for (let i = 0; i < window.length; i++) {
const val = ((window[i] % numFrames) + numFrames) % numFrames;
if (val < prev) return [true, i];
prev = val;
}
return [false, -1];
}
function shiftWindowToStart(window, numFrames) {
const startVal = window[0];
for (let i = 0; i < window.length; i++) {
window[i] = ((window[i] - startVal) + numFrames) % numFrames;
}
}
function shiftWindowToEnd(window, numFrames) {
shiftWindowToStart(window, numFrames);
const endDelta = numFrames - window[window.length - 1] - 1;
for (let i = 0; i < window.length; i++) window[i] += endDelta;
}
// p: {length, overlap, stride, closedLoop, step}
function createWindows(numFrames, schedule, p, errors) {
const L = p.length;
if (schedule === 'standard_static') {
if (numFrames <= L) return [range(0, numFrames)];
const delta = L - p.overlap;
if (delta <= 0) {
errors.push(`context_overlap (${p.overlap}) must be smaller than context_length (${L}); the sampler would error`);
return [];
}
const windows = [];
for (let startIdx = 0; startIdx < numFrames; startIdx += delta) {
const ending = startIdx + L;
if (ending >= numFrames) {
const finalStart = startIdx - (ending - numFrames);
windows.push(range(finalStart, finalStart + L));
break;
}
windows.push(range(startIdx, startIdx + L));
if (capReached(windows, errors)) break;
}
return windows;
}
if (schedule === 'standard_static_balanced') {
// standard_static count, placed evenly so seams are uniform (±1 frame)
if (numFrames <= L) return [range(0, numFrames)];
if (L - p.overlap <= 0) errors.push(`context_overlap (${p.overlap}) >= context_length (${L}); windows collapse to stride 1`);
const strideTarget = Math.max(1, L - p.overlap);
let N = Math.ceil((numFrames - L) / strideTarget) + 1; // stride <= L => no gaps
if (N > MAX_WINDOWS) {
errors.push(TRUNC_MSG);
N = MAX_WINDOWS;
}
const windows = [];
for (let i = 0; i < N; i++) {
const start = Math.floor(i * (numFrames - L) / (N - 1) + 0.5);
windows.push(range(start, start + L));
}
return windows;
}
if (schedule === 'batched') {
if (numFrames <= L) return [range(0, numFrames)];
const windows = [];
for (let startIdx = 0; startIdx < numFrames; startIdx += L) {
windows.push(range(startIdx, Math.min(startIdx + L, numFrames)));
if (capReached(windows, errors)) break;
}
return windows;
}
if (schedule === 'batched_shifted') {
// zero-overlap windows whose seams roll each step (~1.0x compute)
if (numFrames <= L) return [range(0, numFrames)];
const offset = pythonRound(numFrames * orderedHalving(p.step)) % L; // 0 at step 0 (plain batched)
const windows = [];
let start = 0;
if (offset > 0) { windows.push(range(0, offset)); start = offset; }
while (start < numFrames) {
const end = Math.min(start + L, numFrames);
windows.push(range(start, end));
start = end;
if (capReached(windows, errors)) break;
}
return windows;
}
if (schedule === 'looped_uniform' || schedule === 'standard_uniform') {
const looped = schedule === 'looped_uniform';
if (looped ? numFrames < L : numFrames <= L) return [range(0, numFrames)];
const windows = [];
const strideCount = Math.min(p.stride, Math.ceil(Math.log2(numFrames / L)) + 1);
for (let sPow = 0; sPow < strideCount; sPow++) {
const contextStep = 1 << sPow;
const pad = pythonRound(numFrames * orderedHalving(p.step));
const start = Math.floor(orderedHalving(p.step) * contextStep) + pad;
const stop = numFrames + pad + (looped && p.closedLoop ? 0 : -p.overlap);
const stepSize = L * contextStep - p.overlap;
if (stepSize <= 0) {
errors.push(`window advance is ${stepSize} (≤ 0) at stride ${contextStep}; the sampler would hang/error`);
continue;
}
for (let j = start; j < stop; j += stepSize) {
const w = [];
for (let e = j; e < j + L * contextStep; e += contextStep) {
w.push(((e % numFrames) + numFrames) % numFrames);
}
windows.push(w);
if (capReached(windows, errors)) return windows;
}
}
if (!looped) {
// shift roll-over windows to the end, fill gaps, drop duplicates
const deleteIdxs = [];
let winI = 0;
while (winI < windows.length) {
const [isRoll, rollIdx] = doesWindowRollOver(windows[winI], numFrames);
if (isRoll) {
const rollVal = windows[winI][rollIdx];
shiftWindowToEnd(windows[winI], numFrames);
if (!windows[(winI + 1) % windows.length].includes(rollVal)) {
windows.splice(winI + 1, 0, range(rollVal, rollVal + L));
}
}
for (let preI = 0; preI < winI; preI++) {
if (arraysEqual(windows[winI], windows[preI])) {
deleteIdxs.push(winI);
break;
}
}
winI++;
}
deleteIdxs.reverse();
for (const i of deleteIdxs) windows.splice(i, 1);
}
return windows;
}
return [range(0, numFrames)];
}
// extra overlap on the last static window from its shove-back; 0 = even tiling
function staticFinalDelta(F, L, overlap) {
if (F <= L) return 0;
const d = L - overlap;
if (d <= 0) return 0; // invalid config, flagged elsewhere
const mod = (F - L) % d;
return mod === 0 ? 0 : d - mod;
}
function linspace(a, b, n) {
if (n === 1) return [a];
const out = [];
for (let i = 0; i < n; i++) out.push(a + (b - a) * i / (n - 1));
return out;
}
function weightsPyramid(length) {
const seq = [];
if (length % 2 === 0) {
const m = length / 2;
for (let i = 1; i <= m; i++) seq.push(i);
for (let i = m; i >= 1; i--) seq.push(i);
} else {
const m = (length + 1) / 2;
for (let i = 1; i < m; i++) seq.push(i);
seq.push(m);
for (let i = m - 1; i >= 1; i--) seq.push(i);
}
return seq;
}
function weightsOverlapLinear(length, fullLength, idxs, overlap, errors) {
const w = new Array(length).fill(1);
if (overlap > length && errors) {
errors.push(`overlap-linear with context_overlap > context_length would error in the sampler`);
}
const ov = Math.min(overlap, length);
if (ov > 0) {
if (arrMin(idxs) > 0) {
const ramp = linspace(1e-37, 1, ov);
for (let i = 0; i < ov; i++) w[i] = ramp[i];
}
if (arrMax(idxs) < fullLength - 1) {
const ramp = linspace(1, 1e-37, ov);
for (let i = 0; i < ov; i++) w[length - ov + i] = ramp[i];
}
}
return w;
}
function weightsRelative(idxList) {
// per-index triangular bias (sequential weighted avg == bias/Σbias share)
const first = idxList[0];
const last = idxList[idxList.length - 1];
return idxList.map((idx) => {
const bias = 1 - Math.abs(idx - (first + last) / 2) / ((last - first + 1e-2) / 2);
return Math.max(1e-2, bias);
});
}
// smooth overlap-linear: flat interior, raised-cosine ramps that sum to 1
function weightsHann(length, fullLength, idxs, overlap, errors) {
const w = new Array(length).fill(1);
if (overlap > length && errors) {
errors.push(`hann with context_overlap (${overlap}) > context_length (${length}); ramp clamped`);
}
const ov = Math.min(Math.max(overlap, 0), length);
if (ov >= 1) {
const denom = Math.max(ov - 1, 1);
if (arrMin(idxs) > 0) {
for (let j = 0; j < ov; j++) w[j] = Math.max(0.5 * (1 - Math.cos(Math.PI * j / denom)), 1e-37);
}
if (arrMax(idxs) < fullLength - 1) {
for (let j = 0; j < ov; j++) w[length - ov + j] = Math.max(0.5 * (1 - Math.cos(Math.PI * (denom - j) / denom)), 1e-37);
}
}
return w;
}
// smooth bell over the window (smooth twin of pyramid)
function weightsGaussian(length) {
if (length <= 1) return new Array(length).fill(1);
const c = (length - 1) / 2;
const std = Math.max(length / 4, 1e-6);
const out = [];
for (let i = 0; i < length; i++) out.push(Math.exp(-0.5 * ((i - c) / std) ** 2));
return out;
}
function computeViz(p) {
const errors = [];
const numFrames = Math.max(1, p.numFrames);
const rawWindows = createWindows(numFrames, p.schedule, {
length: Math.max(1, p.length),
overlap: Math.max(0, p.overlap),
stride: Math.max(1, p.stride),
closedLoop: p.closedLoop,
step: Math.max(0, p.step),
}, errors);
const windows = rawWindows.map((idxList) => {
let anchor = -1;
if (p.causalFix) {
const a = idxList[0] - 1;
if (a >= 0 && a < numFrames) anchor = a;
}
let weights;
if (p.fuse === 'relative') weights = weightsRelative(idxList);
else if (p.fuse === 'flat') weights = new Array(idxList.length).fill(1);
else if (p.fuse === 'overlap-linear') weights = weightsOverlapLinear(idxList.length, numFrames, idxList, Math.max(0, p.overlap), errors);
else if (p.fuse === 'hann') weights = weightsHann(idxList.length, numFrames, idxList, Math.max(0, p.overlap), errors);
else if (p.fuse === 'gaussian') weights = weightsGaussian(idxList.length);
else weights = weightsPyramid(idxList.length);
const [rolls] = doesWindowRollOver(idxList, numFrames);
return { idxList, anchor, weights, rolls };
});
// per-frame total weight (counts_final in the handler)
const totals = new Float64Array(numFrames);
for (const w of windows) {
for (let pos = 0; pos < w.idxList.length; pos++) totals[w.idxList[pos]] += w.weights[pos];
}
const missing = [];
for (let f = 0; f < numFrames; f++) if (totals[f] === 0) missing.push(f);
let evals = 0;
for (const w of windows) evals += w.idxList.length + (w.anchor >= 0 ? 1 : 0);
return { numFrames, windows, totals, missing, evals, errors: [...new Set(errors)] };
}
// --- end context window math ---
const STYLE_ID = 'kj-cwviz-style';
function ensureStyles() {
if (document.getElementById(STYLE_ID)) return;
const s = document.createElement('style');
s.id = STYLE_ID;
s.textContent = `
.kj-cw-root { width:100%; height:100%; display:flex; flex-direction:column; background:#181818; overflow:hidden; user-select:none; border-radius:4px; }
.kj-cw-bar { display:flex; align-items:center; gap:6px; padding:4px 6px; background:#222; color:#ddd; font:12px sans-serif; flex:0 0 auto; }
.kj-cw-btn { background:#333; color:#ddd; border:1px solid #444; padding:1px 10px; cursor:pointer; font:12px sans-serif; border-radius:3px; }
.kj-cw-btn:hover { background:#444; }
.kj-cw-scrubber { position:relative; flex:1 1 auto; height:20px; background:#2a2a2a; border:1px solid #444; cursor:ew-resize; user-select:none; touch-action:none; border-radius:3px; overflow:hidden; }
.kj-cw-scrubber-fill { position:absolute; top:0; bottom:0; left:0; width:0; background:#3a5a7a; pointer-events:none; }
.kj-cw-scrubber-text { position:absolute; inset:0; display:flex; align-items:center; justify-content:center; color:#ddd; font:11px sans-serif; pointer-events:none; text-shadow:0 1px 2px rgba(0,0,0,0.6); }
.kj-cw-steps { width:42px; background:#2a2a2a; color:#ddd; border:1px solid #444; font:11px sans-serif; padding:2px 4px; border-radius:3px; }
.kj-cw-info { padding:2px 8px; color:#aaa; font:11px sans-serif; flex:0 0 auto; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.kj-cw-info.error { color:#e06c5a; }
.kj-cw-canvas { flex:1 1 auto; min-height:0; width:100%; display:block; cursor:crosshair; }
`;
document.head.appendChild(s);
}
const STEP_DEPENDENT = ['standard_uniform', 'looped_uniform', 'batched_shifted']; // schedules whose windows change per sampling step
const WINDOW_HUE_STEP = 137.508; // golden angle, distinct adjacent colors
function windowColor(i, sat = 65, light = 60, alpha = 1) {
return `hsla(${(i * WINDOW_HUE_STEP) % 360}, ${sat}%, ${light}%, ${alpha})`;
}
function pickTickStep(numFrames, plotW) {
const steps = [1, 2, 5, 10, 20, 25, 50, 100, 200, 500, 1000];
for (const s of steps) {
if ((plotW / numFrames) * s >= 34) return s;
}
return steps[steps.length - 1];
}
app.registerExtension({
name: 'KJNodes.ContextWindowsVisualizer',
async beforeRegisterNodeDef(nodeType, nodeData) {
if (nodeData?.name !== 'ContextWindowsVisualizerKJ') return;
chainCallback(nodeType.prototype, 'onNodeCreated', function () {
ensureStyles();
const node = this;
if (node.size[0] < 560 || node.size[1] < 480) node.setSize([Math.max(node.size[0], 560), Math.max(node.size[1], 480)]);
const root = document.createElement('div');
root.className = 'kj-cw-root';
const bar = document.createElement('div');
bar.className = 'kj-cw-bar';
const playBtn = document.createElement('button');
playBtn.className = 'kj-cw-btn';
playBtn.textContent = '▶';
playBtn.title = 'Animate sampling steps (uniform schedules shift their windows each step)';
const scrubber = document.createElement('div');
scrubber.className = 'kj-cw-scrubber';
const scrubberFill = document.createElement('div');
scrubberFill.className = 'kj-cw-scrubber-fill';
const scrubberText = document.createElement('span');
scrubberText.className = 'kj-cw-scrubber-text';
scrubber.appendChild(scrubberFill);
scrubber.appendChild(scrubberText);
const stepsInput = document.createElement('input');
stepsInput.className = 'kj-cw-steps';
stepsInput.type = 'number';
stepsInput.min = '1';
stepsInput.max = '999';
stepsInput.title = 'Total sampling steps to scrub through';
bar.appendChild(playBtn);
bar.appendChild(scrubber);
bar.appendChild(stepsInput);
const info = document.createElement('div');
info.className = 'kj-cw-info';
const canvas = document.createElement('canvas');
canvas.className = 'kj-cw-canvas';
root.appendChild(bar);
root.appendChild(info);
root.appendChild(canvas);
node.addDOMWidget('context_windows_viz', 'div', root, { serialize: false });
const removeMiddleClickPan = addMiddleClickPan(root);
addWheelPassthrough(root);
const state = {
step: 0,
steps: 20,
viz: null,
latent: null, // converted params used for the viz
hoverWin: -1,
hoverFrame: -1,
mouseX: 0,
mouseY: 0,
layout: null, // hit-test geometry from last draw
};
const getWidgetValue = (name, fallback) => {
const w = node.widgets?.find((w) => w.name === name);
return w ? w.value : fallback;
};
const persist = () => {
node.properties = node.properties || {};
node.properties.cw_viz = { step: state.step, steps: state.steps };
};
const readParams = () => {
const units = getWidgetValue('frame_units', 'pixel');
const factor = Math.max(getWidgetValue('temporal_downscale', 4), 1);
let numFrames = getWidgetValue('num_frames', 161);
let length = getWidgetValue('context_length', 81);
let overlap = getWidgetValue('context_overlap', 30);
if (units === 'pixel') {
numFrames = Math.max(Math.floor((numFrames - 1) / factor) + 1, 1);
length = Math.max(Math.floor((length - 1) / factor) + 1, 1);
overlap = Math.max(Math.floor((overlap - 1) / factor) + 1, 0);
}
const schedule = getWidgetValue('context_schedule', 'standard_static');
// flag the oversized final seam plain standard_static can leave
const finalDelta = schedule === 'standard_static' ? staticFinalDelta(numFrames, length, overlap) : 0;
return {
units,
factor,
numFrames,
length,
overlap,
finalDelta,
schedule,
stride: getWidgetValue('context_stride', 1),
closedLoop: !!getWidgetValue('closed_loop', false),
fuse: getWidgetValue('fuse_method', 'pyramid'),
causalFix: !!getWidgetValue('causal_window_fix', false),
step: state.step,
};
};
const updateScrubberUI = () => {
const t = state.steps > 1 ? state.step / (state.steps - 1) : 0;
scrubberFill.style.width = (t * 100) + '%';
const stepIndependent = state.latent && !STEP_DEPENDENT.includes(state.latent.schedule);
scrubberText.textContent = `step ${state.step + 1} / ${state.steps}` + (stepIndependent ? ' (static schedule, no effect)' : '');
stepsInput.value = String(state.steps);
};
const updateInfo = () => {
if (!state.viz) return;
const v = state.viz;
if (v.errors.length) {
info.classList.add('error');
info.textContent = '⚠ ' + v.errors.join(' · ');
info.title = v.errors.join('\n');
return;
}
info.classList.remove('error');
const lat = state.latent;
const overhead = v.numFrames > 0 ? (v.evals / v.numFrames) : 0;
const px = lat.units === 'pixel' ? ` (${(v.numFrames - 1) * lat.factor + 1}px frames)` : '';
let txt = `${v.windows.length} windows over ${v.numFrames} latent frames${px} · ${v.evals} frame evals/step (${overhead.toFixed(2)}×)`;
if (v.missing.length) txt += ` · ⚠ ${v.missing.length} uncovered frames`;
if (lat.schedule === 'standard_static' && lat.finalDelta > 0) {
txt += ` · ⚠ last window overlaps +${lat.finalDelta} frames; standard_static_balanced spreads seams evenly`;
} else if (lat.schedule === 'standard_static_balanced') {
txt += ` · balanced placement: even seams (±1 frame)`;
} else if (lat.schedule === 'batched_shifted') {
const off = pythonRound(v.numFrames * orderedHalving(lat.step)) % lat.length;
txt += v.windows.length > 1 ? ` · zero-overlap rolling seams (step offset ${off})` : ` · zero-overlap`;
}
info.textContent = txt;
info.title = txt;
};
let rafPending = false;
const scheduleRender = () => {
if (rafPending) return;
rafPending = true;
requestAnimationFrame(() => {
rafPending = false;
draw();
});
};
const recompute = () => {
state.latent = readParams();
state.viz = computeViz(state.latent);
state.hoverWin = -1;
state.hoverFrame = -1;
updateScrubberUI();
updateInfo();
scheduleRender();
};
const draw = () => {
const viz = state.viz;
if (!viz) return;
const dpr = window.devicePixelRatio || 1;
const cw = canvas.clientWidth;
const ch = canvas.clientHeight;
if (cw <= 0 || ch <= 0) return;
const W = Math.floor(cw * dpr);
const H = Math.floor(ch * dpr);
if (canvas.width !== W) canvas.width = W;
if (canvas.height !== H) canvas.height = H;
const ctx = canvas.getContext('2d');
ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
ctx.clearRect(0, 0, cw, ch);
ctx.fillStyle = '#181818';
ctx.fillRect(0, 0, cw, ch);
const n = viz.numFrames;
const pad = 8;
const gutter = 30;
const rulerH = 16;
const chartH = Math.max(50, Math.min(110, ch * 0.28));
const chartGap = 18;
const plotX = pad + gutter;
const plotW = cw - plotX - pad;
const rowsY = pad + rulerH + 4;
const chartY = ch - pad - chartH;
const rowsH = chartY - chartGap - rowsY;
if (plotW <= 0 || rowsH <= 10) return;
const cellW = plotW / n;
const barW = Math.max(cellW - (cellW > 3 ? 0.5 : 0), 0.5); // cell width minus a hairline gap
const wins = viz.windows;
const rowH = wins.length ? Math.min(20, Math.max(3, rowsH / wins.length)) : 0;
state.layout = { plotX, plotW, rowsY, rowH, chartY, chartH, n };
// ruler
ctx.font = '10px sans-serif';
ctx.textBaseline = 'middle';
ctx.fillStyle = '#777';
ctx.strokeStyle = '#3a3a3a';
const tick = pickTickStep(n, plotW);
for (let f = 0; f < n; f += tick) {
const x = plotX + (f + 0.5) * cellW;
ctx.textAlign = 'center';
ctx.fillText(String(f), x, pad + rulerH / 2);
ctx.beginPath();
ctx.moveTo(x, rowsY);
ctx.lineTo(x, chartY + chartH);
ctx.stroke();
}
// uncovered frames
if (viz.missing.length) {
ctx.fillStyle = 'rgba(220,70,60,0.25)';
for (const f of viz.missing) ctx.fillRect(plotX + f * cellW, rowsY, cellW, (chartY + chartH) - rowsY);
}
// window rows
const hov = state.hoverWin;
let drawnRows = wins.length;
for (let i = 0; i < wins.length; i++) {
const w = wins[i];
const y = rowsY + i * rowH;
if (y + rowH > rowsY + rowsH + 1) { drawnRows = i; break; }
const dim = hov >= 0 && hov !== i;
const maxW = arrMax(w.weights);
// row label
if (rowH >= 9) {
ctx.fillStyle = dim ? '#555' : '#999';
ctx.textAlign = 'right';
ctx.fillText(String(i), plotX - 4, y + rowH / 2);
}
for (let pos = 0; pos < w.idxList.length; pos++) {
const f = w.idxList[pos];
const wt = maxW > 0 ? w.weights[pos] / maxW : 1;
const alpha = (0.25 + 0.7 * wt) * (dim ? 0.25 : 1);
// also encode weight as cell height when rows are tall
const hFrac = rowH >= 8 ? 0.35 + 0.65 * wt : 1;
const cellH = Math.max(1.5, (rowH - 1) * hFrac);
ctx.fillStyle = windowColor(i, 65, 60, alpha);
ctx.fillRect(plotX + f * cellW, y + (rowH - 1 - cellH), barW, cellH);
}
// causal anchor marker
if (w.anchor >= 0 && !dim) {
ctx.strokeStyle = windowColor(i, 65, 75, 0.9);
ctx.setLineDash([2, 2]);
ctx.strokeRect(plotX + w.anchor * cellW + 0.5, y + 0.5, Math.max(cellW - 1, 1), Math.max(rowH - 2, 1));
ctx.setLineDash([]);
}
if (hov === i) {
const lo = arrMin(w.idxList);
const hi = arrMax(w.idxList);
ctx.strokeStyle = '#fff';
ctx.lineWidth = 1;
ctx.strokeRect(plotX + lo * cellW, y, (hi - lo + 1) * cellW, rowH - 1);
}
}
state.layout.drawnRows = drawnRows;
// blend chart: stacked normalized contribution per frame
ctx.fillStyle = '#888';
ctx.textAlign = 'left';
ctx.fillText('blend (normalized contribution per frame)', plotX, chartY - 8);
if (drawnRows < wins.length) {
ctx.textAlign = 'right';
ctx.fillText(`…+${wins.length - drawnRows} more windows (enlarge node)`, plotX + plotW, chartY - 8);
}
ctx.strokeStyle = '#3a3a3a';
ctx.strokeRect(plotX, chartY, plotW, chartH);
const stackOffsets = new Float64Array(n);
for (let i = 0; i < wins.length; i++) {
const w = wins[i];
const dim = hov >= 0 && hov !== i;
ctx.fillStyle = windowColor(i, dim ? 25 : 65, dim ? 38 : 58, dim ? 0.6 : 0.92);
for (let pos = 0; pos < w.idxList.length; pos++) {
const f = w.idxList[pos];
const total = viz.totals[f];
if (total <= 0) continue;
const h = (w.weights[pos] / total) * chartH;
const yOff = (stackOffsets[f] / total) * chartH;
stackOffsets[f] += w.weights[pos];
ctx.fillRect(plotX + f * cellW, chartY + chartH - yOff - h, barW, h);
}
}
// hover guide + tooltip
if (state.hoverFrame >= 0) {
const x = plotX + (state.hoverFrame + 0.5) * cellW;
ctx.strokeStyle = 'rgba(255,255,255,0.35)';
ctx.beginPath();
ctx.moveTo(x, rowsY);
ctx.lineTo(x, chartY + chartH);
ctx.stroke();
}
const lines = [];
if (hov >= 0 && hov < wins.length) {
const w = wins[hov];
const strided = w.idxList.length > 1 ? w.idxList[1] - w.idxList[0] : 1;
let l = `window ${hov + 1}/${wins.length}: ${w.idxList.length} frames [${w.idxList[0]}…${w.idxList[w.idxList.length - 1]}]`;
if (Math.abs(strided) > 1) l += ` stride ${strided}`;
if (w.rolls) l += ' (wraps)';
if (w.anchor >= 0) l += ` · anchor ${w.anchor}`;
lines.push(l);
}
if (state.hoverFrame >= 0) {
const f = state.hoverFrame;
const cover = [];
for (let i = 0; i < wins.length; i++) {
const pos = wins[i].idxList.indexOf(f);
if (pos >= 0) cover.push([i, wins[i].weights[pos]]);
}
const px = state.latent.units === 'pixel' ? ` (≈px ${f * state.latent.factor})` : '';
if (cover.length === 0) {
lines.push(`frame ${f}${px}: not covered by any window!`);
} else {
const total = viz.totals[f];
const shares = cover.map(([i, wt]) => `w${i + 1} ${(100 * wt / total).toFixed(0)}%`).join(', ');
lines.push(`frame ${f}${px}: ${shares}`);
}
}
if (lines.length) {
ctx.font = '11px sans-serif';
const tw = Math.max(...lines.map((l) => ctx.measureText(l).width)) + 12;
const th = lines.length * 15 + 8;
let tx = state.mouseX + 14;
let ty = state.mouseY + 14;
if (tx + tw > cw - 4) tx = state.mouseX - tw - 8;
if (ty + th > ch - 4) ty = state.mouseY - th - 8;
ctx.fillStyle = 'rgba(20,20,20,0.92)';
ctx.strokeStyle = '#555';
ctx.fillRect(tx, ty, tw, th);
ctx.strokeRect(tx, ty, tw, th);
ctx.fillStyle = '#ddd';
ctx.textAlign = 'left';
for (let i = 0; i < lines.length; i++) ctx.fillText(lines[i], tx + 6, ty + 12 + i * 15);
}
};
// hover handling
canvas.addEventListener('pointermove', (e) => {
if (!state.viz || !state.layout) return;
const rect = canvas.getBoundingClientRect();
const x = e.clientX - rect.left;
const y = e.clientY - rect.top;
state.mouseX = x;
state.mouseY = y;
const lay = state.layout;
let frame = Math.floor((x - lay.plotX) / (lay.plotW / lay.n));
if (x < lay.plotX || frame < 0 || frame >= lay.n) frame = -1;
let win = -1;
const visibleRows = Math.min(lay.drawnRows ?? state.viz.windows.length, state.viz.windows.length);
if (y >= lay.rowsY && y < lay.rowsY + lay.rowH * visibleRows && lay.rowH > 0) {
win = Math.floor((y - lay.rowsY) / lay.rowH);
if (win >= visibleRows) win = -1;
} else if (y >= lay.chartY && y <= lay.chartY + lay.chartH && frame >= 0) {
// pick the stacked band under the cursor
const total = state.viz.totals[frame];
if (total > 0) {
const fromBottom = (lay.chartY + lay.chartH - y) / lay.chartH * total;
let acc = 0;
for (let i = 0; i < state.viz.windows.length; i++) {
const w = state.viz.windows[i];
const pos = w.idxList.indexOf(frame);
if (pos < 0) continue;
acc += w.weights[pos];
if (fromBottom <= acc) { win = i; break; }
}
}
}
if (win !== state.hoverWin || frame !== state.hoverFrame) {
state.hoverWin = win;
state.hoverFrame = frame;
}
scheduleRender();
});
canvas.addEventListener('pointerleave', () => {
state.hoverWin = -1;
state.hoverFrame = -1;
scheduleRender();
});
// step scrubber
let scrubbing = false;
const scrubFromEvent = (e) => {
const rect = scrubber.getBoundingClientRect();
const t = Math.max(0, Math.min(1, (e.clientX - rect.left) / rect.width));
const step = Math.round(t * (state.steps - 1));
if (step !== state.step) {
state.step = step;
persist();
recompute();
}
};
scrubber.addEventListener('pointerdown', (e) => {
if (e.button !== 0) return;
stopPlayback();
scrubbing = true;
scrubber.setPointerCapture(e.pointerId);
scrubFromEvent(e);
e.preventDefault();
});
scrubber.addEventListener('pointermove', (e) => {
if (scrubbing) scrubFromEvent(e);
});
const endScrub = (e) => {
if (!scrubbing) return;
scrubbing = false;
try { scrubber.releasePointerCapture(e.pointerId); } catch (_) { }
};
scrubber.addEventListener('pointerup', endScrub);
scrubber.addEventListener('pointercancel', endScrub);
stepsInput.addEventListener('change', () => {
const v = parseInt(stepsInput.value, 10);
if (Number.isFinite(v) && v >= 1 && v <= 999) {
state.steps = v;
if (state.step >= v) state.step = v - 1;
persist();
recompute();
} else {
stepsInput.value = String(state.steps);
}
});
stepsInput.addEventListener('pointerdown', (e) => e.stopPropagation());
// step playback
let playHandle = 0;
const stopPlayback = () => {
if (playHandle) {
clearInterval(playHandle);
playHandle = 0;
playBtn.textContent = '▶';
}
};
playBtn.addEventListener('click', () => {
if (playHandle) {
stopPlayback();
return;
}
playBtn.textContent = '⏸';
playHandle = setInterval(() => {
state.step = (state.step + 1) % state.steps;
persist();
recompute();
}, 300);
});
// live updates on widget changes
const WATCHED = ['frame_units', 'temporal_downscale', 'num_frames', 'context_length', 'context_overlap',
'context_schedule', 'context_stride', 'closed_loop', 'fuse_method', 'causal_window_fix'];
for (const name of WATCHED) {
const w = node.widgets?.find((w) => w.name === name);
if (!w) continue;
const orig = w.callback;
w.callback = function (...args) {
const r = orig ? orig.apply(this, args) : undefined;
recompute();
return r;
};
}
const ro = new ResizeObserver(() => scheduleRender());
ro.observe(canvas);
chainCallback(node, 'onConfigure', function () {
const saved = this.properties?.cw_viz;
if (saved) {
if (Number.isFinite(saved.steps)) state.steps = Math.min(999, Math.max(1, saved.steps));
if (Number.isFinite(saved.step)) state.step = Math.min(state.steps - 1, Math.max(0, saved.step));
}
recompute();
});
chainCallback(node, 'onRemoved', function () {
stopPlayback();
ro.disconnect();
removeMiddleClickPan();
});
recompute();
});
},
});
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