sgrant/mccs-idphoto
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Add fixed aspect ratio and image scaling on download

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This commit is contained in:
Skylar Grant 2026-07-08 11:25:05 -04:00
parent 272fb59545
commit 1bed329472
2 changed files with 31 additions and 7 deletions
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11
index.html
View File

@ -39,10 +39,13 @@
<p class="text-sm text-gray-500 dark:text-gray-400 mt-1">Capture a photo from your webcam and save it using the student number.</p>
</header>
<div class="relative bg-black rounded-xl overflow-hidden aspect-video flex items-center justify-center">
<video id="video" class="w-full h-full object-cover" autoplay playsinline muted></video>
<img id="preview-img" class="hidden w-full h-full object-cover" alt="Captured student photo">
<p id="camera-status" class="absolute text-gray-300 text-sm">Requesting camera access…</p>
<div class="space-y-2">
<div class="relative bg-black rounded-xl overflow-hidden aspect-[145/185] max-w-[280px] mx-auto flex items-center justify-center">
<video id="video" class="w-full h-full object-cover" autoplay playsinline muted></video>
<img id="preview-img" class="hidden w-full h-full object-cover" alt="Captured student photo">
<p id="camera-status" class="absolute text-gray-300 text-sm px-4 text-center">Requesting camera access…</p>
</div>
<p class="text-xs text-gray-400 dark:text-gray-500 text-center">Frame matches the final 145×185 photo — fill it with the student's face and shoulders.</p>
</div>
<canvas id="canvas" class="hidden"></canvas>

27
js/app.js
View File

@ -7,6 +7,10 @@ const inputError = document.getElementById('input-error');
const captureBtn = document.getElementById('capture-btn');
const downloadLink = document.getElementById('download-link');
const OUTPUT_WIDTH = 145;
const OUTPUT_HEIGHT = 185;
const TARGET_RATIO = OUTPUT_WIDTH / OUTPUT_HEIGHT;
let captured = false;
async function startCamera() {
@ -53,10 +57,27 @@ function capturePhoto() {
}
inputError.classList.add('hidden');
canvas.width = video.videoWidth;
canvas.height = video.videoHeight;
const videoWidth = video.videoWidth;
const videoHeight = video.videoHeight;
const videoRatio = videoWidth / videoHeight;
let sx, sy, sw, sh;
if (videoRatio > TARGET_RATIO) {
sh = videoHeight;
sw = sh * TARGET_RATIO;
sx = (videoWidth - sw) / 2;
sy = 0;
} else {
sw = videoWidth;
sh = sw / TARGET_RATIO;
sx = 0;
sy = (videoHeight - sh) / 2;
}
canvas.width = OUTPUT_WIDTH;
canvas.height = OUTPUT_HEIGHT;
const ctx = canvas.getContext('2d');
ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
ctx.drawImage(video, sx, sy, sw, sh, 0, 0, OUTPUT_WIDTH, OUTPUT_HEIGHT);
const dataUrl = canvas.toDataURL('image/png');
const filename = `${sanitizeFilename(studentNumber)}.png`;