From ad0e5c8e2a336adef1c56776b27cbc4eaf03c437 Mon Sep 17 00:00:00 2001
From: Ian Gulliver <ian@flamingcow.tv>
Date: Mon, 23 Nov 2015 23:34:52 -0800
Subject: [PATCH] Save and restore pan position. Zoom into the center.
 De-clutter the URL a bit.

---
 static/clicks.js | 46 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/static/clicks.js b/static/clicks.js
index f56434a..d37e484 100644
--- a/static/clicks.js
+++ b/static/clicks.js
@@ -469,6 +469,8 @@ Clicks.prototype.parseConfigString = function(str) {
       case 'zoom':
       case 'muted':
       case 'time':
+      case 'x':
+      case 'y':
         this.delayedConfig_[keyValue[0]] = keyValue[1];
         break;
     }
@@ -476,17 +478,28 @@ Clicks.prototype.parseConfigString = function(str) {
 };
 
 
+Clicks.prototype.fixedDecimal_ = function(num, dec) {
+  var mult = Math.pow(10, dec);
+  return Math.floor(num * mult) / mult;
+};
+
+
 Clicks.prototype.getConfigString = function() {
   if (!this.activePlayer_) {
     return '';
   }
 
+  var pan = this.activePlayer_.getPanPosition();
+
   var config = {
     'ytid': this.activePlayer_.id,
     'rate': this.activePlayer_.getRate().realRate,
     'zoom': this.activePlayer_.getZoomLevel(),
+    'x': this.fixedDecimal_(pan[0], 3),
+    'y': this.fixedDecimal_(pan[1], 3),
     'muted': this.activePlayer_.player.isMuted() ? 1 : 0,
-    'time': this.activePlayer_.player.getCurrentTime(),
+    'time': this.fixedDecimal_(
+        this.activePlayer_.player.getCurrentTime(), 3),
   };
   var params = [];
   for (var key in config) {
@@ -623,6 +636,13 @@ Clicks.prototype.onVideoAdded_ = function(player) {
         break;
     }
   }
+  // Pan has to come after zoom
+  if (this.delayedConfig_['x'] && this.delayedConfig_['y']) {
+    this.activePlayer_.setPanPosition(
+        parseFloat(this.delayedConfig_['x']),
+        parseFloat(this.delayedConfig_['y']));
+  }
+
   this.activePlayer_.resize();
   this.activePlayer_.player.unMute();
 
@@ -886,7 +906,10 @@ ClicksVideo.prototype.getZoomLevel = function() {
 
 ClicksVideo.prototype.zoom = function(zoomLevel) {
   this.zoomLevel_ = zoomLevel;
+  var pan = this.getPanPosition();
   this.resize();
+  // Zoom in to the center of viewport, not the top left.
+  this.setPanPosition(pan[0], pan[1]);
 };
 
 
@@ -946,6 +969,27 @@ ClicksVideo.prototype.onPlayerStateChange_ = function(e) {
 };
 
 
+ClicksVideo.prototype.getPanPosition = function() {
+  return [
+    ((this.playerContainer_.scrollLeft + (this.playerContainer_.clientWidth / 2))
+     / this.playerContainer_.scrollWidth),
+    ((this.playerContainer_.scrollTop + (this.playerContainer_.clientHeight / 2))
+     / this.playerContainer_.scrollHeight),
+  ];
+};
+
+
+ClicksVideo.prototype.setPanPosition = function(x, y) {
+  console.log('setPanPosition', x, y);
+  this.playerContainer_.scrollLeft =
+    ((x * this.playerContainer_.scrollWidth)
+     - (this.playerContainer_.clientWidth / 2));
+  this.playerContainer_.scrollTop =
+    ((y * this.playerContainer_.scrollHeight)
+     - (this.playerContainer_.clientHeight / 2));
+};
+
+
 ClicksVideo.prototype.onAPIReady_ = function() {
   this.playerContainer_ = Clicks.createElementAndAppend(
       'clicks-player-container', this.container_);