From 8cd847c6a1da750b6c91992a99a4431ce0257436 Mon Sep 17 00:00:00 2001
From: Nikola Gluhovic <chiari.show@gmail.com>
Date: Tue, 5 Jul 2016 11:24:05 +0200
Subject: [PATCH] fix #1723

---
 lib/timeline/DateUtil.js | 70 +++++++++++++++++++++++++++++-----------
 1 file changed, 52 insertions(+), 18 deletions(-)

diff --git a/lib/timeline/DateUtil.js b/lib/timeline/DateUtil.js
index 1a8a9076..67bf2c20 100644
--- a/lib/timeline/DateUtil.js
+++ b/lib/timeline/DateUtil.js
@@ -286,24 +286,37 @@ exports.stepOverHiddenDates = function(moment, timeStep, previousTime) {
  * @param width
  * @returns {number}
  */
-exports.toScreen = function(Core, time, width) {
-  if (Core.body.hiddenDates.length == 0) {
-    var conversion = Core.range.conversion(width);
-    return (time.valueOf() - conversion.offset) * conversion.scale;
-  }
-  else {
-    var hidden = exports.isHidden(time, Core.body.hiddenDates);
-    if (hidden.hidden == true) {
-      time = hidden.startDate;
-    }
-
-    var duration = exports.getHiddenDurationBetween(Core.body.hiddenDates, Core.range.start, Core.range.end);
-    time = exports.correctTimeForHidden(Core.options.moment, Core.body.hiddenDates, Core.range, time);
+exports.toScreen = function (Core, time, width) {
+    if (Core.body.hiddenDates.length == 0) {
+      var conversion = Core.range.conversion(width);
+      return (time.valueOf() - conversion.offset) * conversion.scale;
+    } else {
+      var hidden = exports.isHidden(time, Core.body.hiddenDates);
+      if (hidden.hidden == true) {
+        time = hidden.startDate;
+      }
 
-    var conversion = Core.range.conversion(width, duration);
-    return (time.valueOf() - conversion.offset) * conversion.scale;
-  }
-};
+      var duration = exports.getHiddenDurationBetween(Core.body.hiddenDates, Core.range.start, Core.range.end);
+      if (time < Core.range.start) {
+        var conversion = Core.range.conversion(width, duration);
+        var durationAfter = exports.getHiddenDurationBeforeStart(Core.body.hiddenDates, time, conversion.offset);
+        time = Core.options.moment(time).toDate().valueOf();
+        time = time + durationAfter;
+        return -(conversion.offset - time.valueOf()) * conversion.scale;
+        
+      } else if (time > Core.range.end) {
+        var rangeAfterEnd = {start: Core.range.start, end: time};
+        time = exports.correctTimeForHidden(Core.options.moment, Core.body.hiddenDates, rangeAfterEnd, time);
+        var conversion = Core.range.conversion(width, duration);
+        return (time.valueOf() - conversion.offset) * conversion.scale;
+
+      } else {
+        time = exports.correctTimeForHidden(Core.options.moment, Core.body.hiddenDates, Core.range, time);
+        var conversion = Core.range.conversion(width, duration);
+        return (time.valueOf() - conversion.offset) * conversion.scale;
+      }
+    }
+  };
 
 
 /**
@@ -351,6 +364,27 @@ exports.getHiddenDurationBetween = function(hiddenDates, start, end) {
   return duration;
 };
 
+/**
+   * Support function
+   *
+   * @param hiddenDates
+   * @param start
+   * @param end
+   * @returns {number}
+   */
+exports.getHiddenDurationBeforeStart = function (hiddenDates, start, end) {
+  var duration = 0;
+  for (var i = 0; i < hiddenDates.length; i++) {
+    var startDate = hiddenDates[i].start;
+    var endDate = hiddenDates[i].end;
+
+  if (startDate >= start && endDate <= end) {
+      duration += endDate - startDate;
+    }
+  }
+  return duration;
+};
+
 
 /**
  * Support function
@@ -470,4 +504,4 @@ exports.isHidden = function(time, hiddenDates) {
     }
   }
   return {hidden: false, startDate: startDate, endDate: endDate};
-}
\ No newline at end of file
+}