private void UpdateSample(TimeSpan sampleTime, TimeSpan sampleBackFor)
{
var sampleLimit = DateTimeOffset.Now - sampleBackFor;
XMinimum = sampleLimit.ToUnixTimeMilliseconds();
var values = _history.SelectTimeSampleBackwards(
x => x.Date,
x => x.Balance,
sampleTime,
sampleLimit,
DateTime.Now);
XValues.Clear();
YValues.Clear();
foreach (var(timestamp, balance) in values.Reverse())
{
YValues.Add((double)balance.ToDecimal(MoneyUnit.BTC));
XValues.Add(timestamp.ToUnixTimeMilliseconds());
}
if (YValues.Any())
{
var maxY = YValues.Max();
YLabels = new List <string> {
"0", (maxY / 2).ToString("F2"), maxY.ToString("F2")
};
}
else
{
YLabels = null;
}
if (XValues.Any())
{
var minX = XValues.Min();
var maxX = XValues.Max();
var halfX = minX + ((maxX - minX) / 2);
var range = DateTimeOffset.FromUnixTimeMilliseconds((long)maxX) -
DateTimeOffset.FromUnixTimeMilliseconds((long)minX);
if (range <= TimeSpan.FromDays(1))
{
XLabels = new List <string>
{
DateTimeOffset.FromUnixTimeMilliseconds((long)minX).DateTime.ToString("t"),
DateTimeOffset.FromUnixTimeMilliseconds((long)halfX).DateTime.ToString("t"),
DateTimeOffset.FromUnixTimeMilliseconds((long)maxX).DateTime.ToString("t"),
};
}
else if (range <= TimeSpan.FromDays(7))
{
XLabels = new List <string>
{
DateTimeOffset.FromUnixTimeMilliseconds((long)minX).DateTime.ToString("ddd MMM-d"),
DateTimeOffset.FromUnixTimeMilliseconds((long)halfX).DateTime.ToString("ddd MMM-d"),
DateTimeOffset.FromUnixTimeMilliseconds((long)maxX).DateTime.ToString("ddd MMM-d"),
};
}
else
{
XLabels = new List <string>
{
DateTimeOffset.FromUnixTimeMilliseconds((long)minX).DateTime.ToString("MMM-d"),
DateTimeOffset.FromUnixTimeMilliseconds((long)halfX).DateTime.ToString("MMM-d"),
DateTimeOffset.FromUnixTimeMilliseconds((long)maxX).DateTime.ToString("MMM-d"),
};
}
}
else
{
XLabels = null;
}
}