I think I eventually got it 🙂
One option is to set the Map TimeExtent by code instead of by binding. So by code you can expand the TimeExtent until 1520.
Hook up an handler to ValueChanged event of your time slider and define your handler this way:
private void MyTimeSlider_ValueChanged(object sender, TimeSlider.ValueChangedEventArgs e)
{
var startDate = new DateTime(1520, 1, 1);
var endDate = e.NewValue.End;
MyMap.TimeExtent = new TimeExtent(startDate, endDate);
}
Another option is to keep a binding with a converter expanding the time extent as above (for MVVM addict).
Thank you for the suggestion and the code, Dominique! I will give that a shot!What I did as a workaround, in the interim, was open up the time slider max and min value to the full time extent and established multiple interval sets for the date ranges on the timeslider so that the TimeSpan for the intervals is 10 years for 1520-1774 (long period of low event count), 6 months for 1774-1786 (short period with very high event count) and 2 years for 1786-1848 (moderate length period with tapering event counts). It may be clumsy, but, as a novice programmer I am a bit proud of making that work. 🙂 (Code attached) //Setting up interval for pre 1774-1786 portion of slider
DateTime myMinDate_Pre = MyTimeSlider.MinimumValue;
DateTime myMaxDate_Pre = DateTime.Parse("1773-12-31T00:00:00.0000000Z",
CultureInfo.CurrentCulture,
DateTimeStyles.AdjustToUniversal);
TimeExtent myTimeExtent_Pre = new TimeExtent(myMinDate_Pre, myMaxDate_Pre);
TimeSpan myTimeSpan_Pre = new TimeSpan(3650, 0, 0, 0);
//Setting up interval for 1774-1786 portion of slider
DateTime myMinDate_Range = DateTime.Parse("1774-01-01T00:00:00.0000000Z",
CultureInfo.CurrentCulture,
DateTimeStyles.AdjustToUniversal);
DateTime myMaxDate_Range = DateTime.Parse("1786-12-31T00:00:00.0000000Z",
CultureInfo.CurrentCulture,
DateTimeStyles.AdjustToUniversal);
TimeExtent myTimeExtent_Range = new TimeExtent(myMinDate_Range, myMaxDate_Range);
TimeSpan myTimeSpan_Range = new TimeSpan(180, 0, 0, 0);
//Setting up interval for post 1774-1786 portion of slider
DateTime myMinDate_Post = DateTime.Parse("1787-01-01T00:00:00.0000000Z",
CultureInfo.CurrentCulture,
DateTimeStyles.AdjustToUniversal);
DateTime myMaxDate_Post = DateTime.Parse("1848-12-31T00:00:00.0000000Z",
CultureInfo.CurrentCulture,
DateTimeStyles.AdjustToUniversal);
TimeExtent myTimeExtent_Post = new TimeExtent(myMinDate_Post, myMaxDate_Post);
TimeSpan myTimeSpan_Post = new TimeSpan(730, 0, 0, 0);
//Creating Date Collection
//Creating IEnumerables
IEnumerable<DateTime> myIEnum_Pre = null;
IEnumerable<DateTime> myIEnum_Range = null;
IEnumerable<DateTime> myIEnum_Post = null;
IEnumerable<DateTime> myIEnum_Comb = null;
//Loading Dates into IEnumerables
myIEnum_Pre = TimeSlider.CreateTimeStopsByTimeInterval(myTimeExtent_Pre, myTimeSpan_Pre);
myIEnum_Range = TimeSlider.CreateTimeStopsByTimeInterval(myTimeExtent_Range, myTimeSpan_Range);
myIEnum_Post = TimeSlider.CreateTimeStopsByTimeInterval(myTimeExtent_Post, myTimeSpan_Post);
//Creating Lists
List<DateTime> myIntervalList_Pre = new List<DateTime>();
List<DateTime> myIntervalList_Range = new List<DateTime>();
List<DateTime> myIntervalList_Post = new List<DateTime>();
//Converting IEnumerables to Lists
myIntervalList_Pre = myIEnum_Pre.ToList();
myIntervalList_Range = myIEnum_Range.ToList();
myIntervalList_Post = myIEnum_Post.ToList();
//Combining Lists
List<DateTime> myIntervalList_Comb = new List<DateTime>();
myIntervalList_Comb.AddRange(myIntervalList_Pre);
myIntervalList_Comb.AddRange(myIntervalList_Range);
myIntervalList_Comb.AddRange(myIntervalList_Post);
//Convering Combined List to IEnumerable
myIEnum_Comb = myIntervalList_Comb;
//Set intervals to show collection
MyTimeSlider.Intervals = myIEnum_Comb;
