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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Align & Optimize - Explicit Fix</title>
<style>
body { font-family: sans-serif; text-align: center; background: #f5f5f5; margin: 20px; }
canvas { border: 1px solid #333; background: #fff; cursor: grab; box-shadow: 0 4px 10px rgba(0,0,0,0.1); }
.panel { background: white; padding: 20px; border-radius: 8px; display: inline-block; border: 1px solid #ccc; margin-bottom: 10px; }
textarea { width: 90%; height: 100px; font-family: monospace; font-size: 11px; margin-top: 10px; }
button { padding: 10px 15px; margin: 5px; cursor: pointer; font-weight: bold; }
#status { color: red; height: 20px; font-weight: bold; }
</style>
</head>
<body>
<h3>Align & Optimize (Asymmetric)</h3>
<div class="panel">
<input type="file" id="f1" accept="image/*">
<input type="file" id="f2" accept="image/*"><br><br>
<button id="opt">Optimize All</button>
<button id="optZoom">Optimize Zoom (Space)</button>
<button id="crop">Prepare Crop</button>
<button id="dl" disabled>Download Images</button>
<br><br>
Iterations: <input type="range" id="iterSlider" min="5" max="50" value="15">
<span id="iterVal">15</span>
</div>
<div id="status"></div>
<div>MSE: <span id="score">-</span> | Overlap: <span id="overlap">-</span></div>
<canvas id="cv"></canvas><br>
<textarea id="cmd" readonly></textarea><br>
<button id="copy">Copy ImageMagick Commands</button>
<script>
const canvas = document.getElementById('cv');
const ctx = canvas.getContext('2d');
const scoreEl = document.getElementById('score');
const overlapEl = document.getElementById('overlap');
const statusEl = document.getElementById('status');
const cmdEl = document.getElementById('cmd');
let i1 = new Image(), i2 = new Image(), l1 = 0, l2 = 0;
let name1 = "img1.png", name2 = "img2.png";
let ox = 0, oy = 0, sx = 1, sy = 1;
let mx = 0, my = 0, drag = 0, lx = 0, ly = 0;
let pyr1 = [], pyr2 = [], out1, out2;
const LEVELS = 4;
let optimizing = false;
// --- Pyramid logic ---
function buildPyramid(img) {
let levels = [];
let c = document.createElement('canvas');
c.width = img.width; c.height = img.height;
let x = c.getContext('2d');
x.drawImage(img, 0, 0);
let d = x.getImageData(0, 0, img.width, img.height).data;
let g = new Float32Array(img.width * img.height);
for (let i = 0, j = 0; i < d.length; i += 4, j++)
g[j] = 0.299 * d[i] + 0.587 * d[i+1] + 0.114 * d[i+2];
levels.push({ w: img.width, h: img.height, data: g });
for (let l = 1; l < LEVELS; l++) {
let p = levels[l-1], w2 = Math.floor(p.w / 2), h2 = Math.floor(p.h / 2);
let g2 = new Float32Array(w2 * h2);
for (let y = 0; y < h2; y++) {
for (let xi = 0; xi < w2; xi++) {
let x0 = 2 * xi, x1 = Math.min(2 * xi + 1, p.w - 1);
let y0 = 2 * y, y1 = Math.min(2 * y + 1, p.h - 1);
g2[y * w2 + xi] = (p.data[y0 * p.w + x0] + p.data[y0 * p.w + x1] +
p.data[y1 * p.w + x0] + p.data[y1 * p.w + x1]) * 0.25;
}
}
levels.push({ w: w2, h: h2, data: g2 });
}
return levels;
}
function sample(img, x, y) {
if (x < 0 || y < 0 || x >= img.w || y >= img.h) return NaN;
let x0 = Math.floor(x), y0 = Math.floor(y), x1 = Math.min(x0 + 1, img.w - 1), y1 = Math.min(y0 + 1, img.h - 1);
let dx = x - x0, dy = y - y0;
return (img.data[y0 * img.w + x0] * (1-dx) + img.data[y0 * img.w + x1] * dx) * (1-dy) +
(img.data[y1 * img.w + x0] * (1-dx) + img.data[y1 * img.w + x1] * dx) * dy;
}
function computeMSE(level, tx, ty, tsx, tsy) {
if (!l1 || !l2) return Infinity;
let A = pyr1[level], B = pyr2[level], sF = 1 / (2**level);
let lox = tx * sF, loy = ty * sF;
let ix0 = Math.max(0, Math.ceil(lox)), iy0 = Math.max(0, Math.ceil(loy));
let ix1 = Math.min(A.w, Math.floor(lox + B.w * tsx)), iy1 = Math.min(A.h, Math.floor(loy + B.h * tsy));
if (ix1 <= ix0 || iy1 <= iy0) return Infinity;
let mse = 0, n = 0;
for (let y = iy0; y < iy1; y++) {
for (let x = ix0; x < ix1; x++) {
let v = sample(B, (x - lox) / tsx, (y - loy) / tsy);
if (isNaN(v)) continue;
let d = A.data[y * A.w + x] - v;
mse += d * d; n++;
}
}
if (level === 0) overlapEl.textContent = n > 0 ? (n/(A.w*A.h)*100).toFixed(1) + '%' : '0%';
return n ? mse / n : Infinity;
}
function draw() {
if (!l1) return;
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.drawImage(i1, 0, 0);
if (l2) {
ctx.save(); ctx.globalAlpha = 0.5;
ctx.translate(ox, oy); ctx.scale(sx, sy);
ctx.drawImage(i2, 0, 0); ctx.restore();
}
scoreEl.textContent = computeMSE(0, ox, oy, sx, sy).toFixed(2);
updateCmd();
}
// --- NEW WHEEL LOGIC (EXPLICIT) ---
canvas.onwheel = function(e) {
if (!l2) return;
e.preventDefault(); // Stop browser zoom
// 1. Identify scroll direction and magnitude
// When Shift is pressed, many browsers move vertical scroll to deltaX
let delta = (Math.abs(e.deltaX) > Math.abs(e.deltaY)) ? e.deltaX : e.deltaY;
let factor = delta < 0 ? 1.05 : 0.95;
// 2. Identify the fixed point (anchor) in image coordinates
// We want the point in i2 that is currently under the mouse to stay there
let imagePointX = (e.offsetX - ox) / sx;
let imagePointY = (e.offsetY - oy) / sy;
// 3. Apply scaling based on modifiers
if (e.shiftKey) {
// Shift + Wheel -> SY ONLY
sy *= factor;
} else if (e.ctrlKey) {
// Ctrl + Wheel -> SX ONLY
sx *= factor;
} else {
// Wheel Only -> UNIFORM
sx *= factor;
sy *= factor;
}
// 4. Update offsets to maintain the anchor point
// Formula: NewOffset = MousePos - (ImagePoint * NewScale)
ox = e.offsetX - (imagePointX * sx);
oy = e.offsetY - (imagePointY * sy);
draw();
};
canvas.onmousedown = e => { drag = 1; lx = e.offsetX; ly = e.offsetY; canvas.style.cursor = "grabbing"; };
canvas.onmouseup = canvas.onmouseleave = () => { drag = 0; canvas.style.cursor = "grab"; };
canvas.onmousemove = e => {
mx = e.offsetX; my = e.offsetY;
if (drag) { ox += (mx - lx); oy += (my - ly); lx = mx; ly = my; draw(); }
};
window.onkeydown = e => { if(e.code === "Space" && !optimizing) { e.preventDefault(); optZoom.click(); } };
// --- Optimizers ---
async function runOpt(mode) {
if (!l1 || !l2) return;
optimizing = true; statusEl.textContent = "OPTIMIZING...";
const iters = parseInt(iterSlider.value);
// For Zoom optimization, we lock the anchor once at the current mouse position
const anchorX = (mx - ox) / sx;
const anchorY = (my - oy) / sy;
for (let l = LEVELS - 1; l >= 0; l--) {
let currentBest = { ox, oy, sx, sy, score: computeMSE(l, ox, oy, sx, sy) };
for (let i = 0; i < iters; i++) {
let stepO = (2 ** l) / (i + 1);
let stepF = 1 + 0.03 / (i + 1);
// Grid search around current parameters
for (let dx of (mode === 'all' ? [-1, 0, 1] : [0])) {
for (let dy of (mode === 'all' ? [-1, 0, 1] : [0])) {
for (let dsx of [-1, 0, 1]) {
for (let dsy of [-1, 0, 1]) {
// Calculate test candidates
let testSX = sx * Math.pow(stepF, dsx);
let testSY = sy * Math.pow(stepF, dsy);
let testOX, testOY;
if (mode === 'zoom') {
// Locked to mouse position
testOX = mx - (anchorX * testSX);
testOY = my - (anchorY * testSY);
} else {
// Free translation
testOX = ox + (dx * stepO);
testOY = oy + (dy * stepO);
}
if (testSX < 0.01 || testSY < 0.01) continue;
let s = computeMSE(l, testOX, testOY, testSX, testSY);
if (s < currentBest.score) {
currentBest = { ox: testOX, oy: testOY, sx: testSX, sy: testSY, score: s };
}
}
}
}
}
// Apply iteration results
ox = currentBest.ox; oy = currentBest.oy; sx = currentBest.sx; sy = currentBest.sy;
draw();
await new Promise(r => setTimeout(r, 0));
}
}
optimizing = false; statusEl.textContent = "";
}
opt.onclick = () => runOpt('all');
optZoom.onclick = () => runOpt('zoom');
// --- I/O ---
f1.onchange = e => {
let f = e.target.files[0]; if (!f) return;
name1 = f.name; i1 = new Image();
i1.onload = () => { l1 = 1; canvas.width = i1.width; canvas.height = i1.height; pyr1 = buildPyramid(i1); draw(); };
i1.src = URL.createObjectURL(f);
};
f2.onchange = e => {
let f = e.target.files[0]; if (!f) return;
name2 = f.name; i2 = new Image();
i2.onload = () => { l2 = 1; pyr2 = buildPyramid(i2); ox = (canvas.width-i2.width)/2; oy = (canvas.height-i2.height)/2; draw(); };
i2.src = URL.createObjectURL(f);
};
crop.onclick = () => {
let x0 = Math.max(0, ox), y0 = Math.max(0, oy);
let w = Math.floor(Math.min(canvas.width, ox + i2.width * sx) - x0);
let h = Math.floor(Math.min(canvas.height, oy + i2.height * sy) - y0);
if (w <= 5 || h <= 5) return alert("Overlap too small!");
out1 = document.createElement('canvas'); out2 = document.createElement('canvas');
out1.width = out2.width = w; out1.height = out2.height = h;
out1.getContext('2d').drawImage(i1, x0, y0, w, h, 0, 0, w, h);
out2.getContext('2d').drawImage(i2, (x0 - ox)/sx, (y0 - oy)/sy, w/sx, h/sy, 0, 0, w, h);
document.getElementById('dl').disabled = false;
};
document.getElementById('dl').onclick = () => {
const s = (c, n) => { let a = document.createElement('a'); a.download = n; a.href = c.toDataURL(); a.click(); };
s(out1, "clipped_" + name1); s(out2, "clipped_" + name2);
};
function updateCmd() {
if (!l1 || !l2) return;
let x0 = Math.max(0, ox), y0 = Math.max(0, oy);
let w = Math.floor(Math.min(canvas.width, ox + i2.width * sx) - x0);
let h = Math.floor(Math.min(canvas.height, oy + i2.height * sy) - y0);
if (w <= 0 || h <= 0) return;
let cr = `${w}x${h}+${Math.round(x0)}+${Math.round(y0)}`;
cmdEl.value = `magick "${name1}" -crop ${cr} +repage "clipped_${name1}"\n` +
`magick "${name2}" -virtual-pixel black -distort AffineProjection "${sx.toFixed(6)},0,0,${sy.toFixed(6)},${ox.toFixed(2)},${oy.toFixed(2)}" -crop ${cr} +repage "clipped_${name2}"`;
}
document.getElementById('copy').onclick = () => { cmdEl.select(); navigator.clipboard.writeText(cmdEl.value); };
iterSlider.oninput = () => document.getElementById('iterVal').textContent = iterSlider.value;
</script>
</body>
</html>
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