commit e988d944a432a383737b5a24c4f6ba8be50819f4
Author: Ben de Roo <ben@de-roo.org>
Date:   Wed Jun 10 19:23:09 2026 +0200

    Add qr.py

diff --git a/qr.py b/qr.py
new file mode 100644
index 0000000..30704bc
--- /dev/null
+++ b/qr.py
@@ -0,0 +1,83 @@
+import pygame
+import qrcode
+import random
+import string
+import time
+import cv2
+from io import BytesIO
+import numpy as np
+
+def gen_id():
+    return ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(8))
+
+def make_qr(data, size):
+    qr = qrcode.QRCode(box_size=10, border=2)
+    qr.add_data(data)
+    qr.make(fit=True)
+    img = qr.make_image(fill="black", back_color="white").convert("RGB")
+    img = img.resize((size, size))
+    buf = BytesIO()
+    img.save(buf, format="PNG")
+    buf.seek(0)
+    return pygame.image.load(buf)
+
+pygame.init()
+
+screen = pygame.display.set_mode((0,0), pygame.FULLSCREEN)
+w, h = screen.get_size()
+clock = pygame.time.Clock()
+
+cap = cv2.VideoCapture(0)
+detector = cv2.QRCodeDetector()
+
+A_id = gen_id()
+B_id = gen_id()
+
+qrA = qrB = None
+decoded_text = ""
+last = 0
+
+qr_size = h // 2
+
+running = True
+while running:
+    for e in pygame.event.get():
+        if e.type == pygame.KEYDOWN and e.key == pygame.K_ESCAPE:
+            running = False
+
+    now = time.time()
+
+    if now - last >= 1:
+        last = now
+        qrA = make_qr(f"A:{A_id}|T:{int(now)}", qr_size)
+        qrB = make_qr(f"B:{B_id}|T:{int(now)}", qr_size)
+
+    ret, frame = cap.read()
+
+    if ret:
+        data, points, _ = detector.detectAndDecode(frame)
+        if data:
+            decoded_text = data
+
+        frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
+        frame = cv2.resize(frame, (w//2, h))
+        frame_surface = pygame.surfarray.make_surface(frame.swapaxes(0,1))
+
+    screen.fill((0,0,0))
+
+    if qrA:
+        screen.blit(qrA, (w//4 - qr_size//2, 0))
+    if qrB:
+        screen.blit(qrB, (w//4 - qr_size//2, h//2))
+
+    if ret:
+        screen.blit(frame_surface, (w//2, 0))
+
+    font = pygame.font.SysFont(None, 36)
+    screen.blit(font.render(decoded_text, True, (0,255,0)), (w//2 + 20, 20))
+
+    pygame.display.flip()
+    clock.tick(30)
+
+cap.release()
+pygame.quit()
\ No newline at end of file