From 084bc97124f0bbab5de4f1e32ed30b148f39f4ae Mon Sep 17 00:00:00 2001
From: pdp8 <pdp8@pdp8.info>
Date: Wed, 24 Aug 2022 16:54:43 +0200
Subject: initial commit

---
 slideshow.js | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 slideshow.js

(limited to 'slideshow.js')

diff --git a/slideshow.js b/slideshow.js
new file mode 100644
index 0000000..4ed2ef8
--- /dev/null
+++ b/slideshow.js
@@ -0,0 +1,80 @@
+selection = []
+visited = []
+current = 0
+playing = 1
+
+document.addEventListener('keyup', function(event) {
+  if(event.keyCode == 37) { prev() } // left
+  else if(event.keyCode == 39) { next() } // right
+  else if(event.keyCode == 32) {
+    toggle_play()
+  } // space
+  else if(event.keyCode == 13) { new_selection() } // enter
+});
+
+function new_selection() {
+  images = Object.keys(distances)
+  start = images[Math.floor(Math.random()*images.length)]
+  sortable = []
+  for (file in distances[start]) {
+    if (visited.indexOf(file) == -1) { // not in visited
+      sortable.push([file,distances[start][file]]) // objects cannot be sorted in js, use array instead
+    }
+  }
+  n = 6
+  selection = []
+  sorted = sortable.sort(function(a, b) { return a[1] - b[1]; }).slice(0,n); // sort by distance, get first n elements
+  sorted.forEach(function(img,index) { 
+    selection.push(img[0])
+    visited.push(img[0])
+  }) 
+  selection = selection.sort(() => Math.random() - 0.5); // shuffle
+  current = 0
+  update()
+}
+
+function src(id,path) { document.getElementById(id).src = path }
+function onclick(id,fun) { document.getElementById(id).onclick = fun }
+
+function hide_controls() {
+  document.getElementById("prev").style.display = "none"
+  document.getElementById("next").style.display = "none"
+}
+
+function show_controls() {
+  document.getElementById("prev").style.display = "block"
+  document.getElementById("next").style.display = "block"
+}
+
+function toggle_play() { playing == 1 ? stop() : play() }
+
+function play() {
+  playing = 1
+  interval = setInterval(function () { next() }, 3000);
+  document.getElementById("play-indicator").title = "Pause slideshow"
+  document.getElementById("play-indicator").innerText = "\u23F8"
+  hide_controls()
+}
+
+function stop() {
+  playing = 0
+  clearInterval(interval)
+  document.getElementById("play-indicator").title = "Play slideshow"
+  document.getElementById("play-indicator").innerText = "\u23F5"
+  show_controls()
+}
+
+function prev() {
+  current = (current-1+selection.length) % selection.length // js % cannot handle negative values
+  update()
+}
+
+function next() {
+  current = (current+1) % selection.length
+  update()
+}
+
+function update() {
+  src('image',"/pictures/"+selection[current])
+}
+
-- 
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