Fix bugs, better progress, allow custom device id

.gitignore

@@ -1,4 +1,5 @@
 db.sqlite
+.device
 data
 node_modules
 static/calibration-visualiser.*

scanner.py

@@ -1,11 +1,21 @@
 import cv2
 import os
 from os.path import join
+import time
 from . import config
 
+# Delay between to captures
+DELAY = 0.5
+
 
 def capture(output_path: str) -> bool:
-    cam = cv2.VideoCapture(0)
+    try:
+        with open('.device', 'r') as f:
+            device_id = int(f.read().rstrip())
+    except:
+        device_id = 0
+
+    cam = cv2.VideoCapture(device_id)
     s, img = cam.read()
     if s:
         cv2.imwrite(output_path, img)
@@ -18,6 +28,15 @@ def scan(output_dir: str):
     for led in config.LEDS_UUIDS:
         print(f'Turn on {led}')
         img = join(output_dir, led + '.jpg')
+
+        # Measure the time it takes to capture
+        start = time.time()
         capture(img)
+        delta = time.time() - start
+
+        # Wait for at least one second between each capture
+        if delta < DELAY:
+            time.sleep(DELAY - delta)
+
         print(f'Turn off {led}')
         yield led

templates/calibrate.html

@@ -65,12 +65,14 @@
     });
 
     calibrateButton.addEventListener('click', async () => {
+        scanIndex++;
         progress = 0;
         progressBar.value = 0;
         previewImage.style.display = "none";
         buttons.forEach(x => x.setAttribute('disabled', 'disabled'));
         calibrateButton.classList.add('is-loading');
         progressBar.style.display = "block";
+        grid.innerHTML = '';
 
         let response = await fetch('/api/scan-for-calibration/{{ object.id }}');
         let reader = response.body.pipeThrough(new TextDecoderStream()).getReader();
@@ -89,6 +91,7 @@
             let cell = document.createElement('div');
             cell.classList.add('cell');
             let img = document.createElement('img');
+            img.classList.add('is-loading');
             img.src = '/data/{{ object.id }}/calibration/' + uuid + '.jpg?v=' + scanIndex;
             cell.appendChild(img);
             grid.appendChild(cell);
@@ -97,8 +100,7 @@
 
     function refreshProgressBar() {
         if (progress !== progressBar.value) {
-            let diff = progress - progressBar.value;
-            progressBar.value += Math.max(diff / 20, 1);
+            progressBar.value = Math.min(progressBar.value + 5, progress);
         }
         requestAnimationFrame(refreshProgressBar);
     }