implement countdown offset to compensate shutter-delay and cheese time

config/config.inc.php

@@ -46,6 +46,7 @@
 // P I C T U R E S
 // control countdown timer in seconds
 $config['picture']['cntdwn_time'] = '5';
+$config['picture']['cntdwn_offset'] = '0';
 $config['picture']['no_cheese'] = false;
 // control time for cheeeeese! in milliseconds
 $config['picture']['cheese_time'] = '1000';

lib/configsetup.inc.php

@@ -326,6 +326,17 @@
             'range_step' => 1,
             'unit' => 'seconds',
         ],
+        'picture_cntdwn_offset' => [
+            'view' => 'advanced',
+            'type' => 'range',
+            'name' => 'picture[cntdwn_offset]',
+            'placeholder' => $defaultConfig['picture']['cntdwn_offset'],
+            'value' => $config['picture']['cntdwn_offset'],
+            'range_min' => 0,
+            'range_max' => 10,
+            'range_step' => 1,
+            'unit' => 'seconds',
+        ],
         'picture_no_cheese' => [
             'view' => 'basic',
             'type' => 'checkbox',

resources/lang/en.json

@@ -310,6 +310,7 @@
   "manual:pictures:filters_enabled": "If enabled, user can choose a imagefiler after taking a picture.",
   "manual:pictures:picture_allow_delete": "If enabled pictures can be deleted on result page directly after they have been taken.",
   "manual:pictures:picture_cheese_time": "Set a time to display \"Cheeeeeeeese!\" after the countdown.",
+  "manual:pictures:picture_cntdwn_offset": "Set an offset to the countdown to compensate the delay because of cheese time, focus and shutter speed.",
   "manual:pictures:picture_cntdwn_time": "Set your countdown time.",
   "manual:pictures:picture_flip": "Choose if your picture is flipped after taken.",
   "manual:pictures:picture_frame": "Enter the path of the frame which is applied to your picture after taking it.",
@@ -414,6 +415,7 @@
   "pictures:filters_enabled": "Allow image filter",
   "pictures:picture_allow_delete": "Allow deletion of the image",
   "pictures:picture_cheese_time": "Cheeeeeeeese!-Timer:",
+  "pictures:picture_cntdwn_offset": "Countdown offset:",
   "pictures:picture_cntdwn_time": "Countdown timer:",
   "pictures:picture_flip": "Flip image:",
   "pictures:picture_frame": "Frame",

src/js/core.js

@@ -899,7 +899,7 @@ const photoBooth = (function () {
         const stop = start > 2 ? start - 2 : start;
 
         function timerFunction() {
-            element.text(current);
+            element.text(Number(current) + Number(config.picture.cntdwn_offset));
             current--;
 
             element.removeClass('tick');