private async static Task <int> Tides(Predictions predictions)
{
var querycount = 0;
predictions.OnQuery += () =>
{
querycount++;
};
// this should cause a query
var tides = await predictions.CurrentTides();
foreach (var tide in tides)
{
Console.WriteLine($"{tide.Date} {tide.Value}");
}
if (tides.Count == 0 || querycount != 1)
{
throw new Exception("Invalid query");
}
// this round should not cause a query
tides = await predictions.CurrentTides();
if (tides.Count == 0 || querycount != 1)
{
throw new Exception("Invalid query");
}
Console.WriteLine();
var extremes = await predictions.CurrentExtremes();
foreach (var e in extremes)
{
Console.WriteLine($"{e.Date} {e.Value} {e.Type}");
}
if (extremes.Count == 0 || querycount != 2)
{
throw new Exception($"Invalid query : {extremes.Count} {querycount}");
}
// this round should not cause a query
extremes = await predictions.CurrentExtremes();
if (extremes.Count == 0 || querycount != 2)
{
throw new Exception("Invalid query");
}
return(0);
}
private async void FrameUpdate(object state)
{
if (Canvas == null)
{
throw new Exception("must have a valid canvas to draw too");
}
// the timer is reentrant, so only allow one instance to run
if (System.Threading.Interlocked.CompareExchange(ref FrameLock, 1, 0) != 0)
{
return;
}
// grab predictions
var extremes = await Prediction.CurrentExtremes();
var suns = await Prediction.CurrentSuns();
// gather the tide extreme data
var extremedetails = new List <ExtremeDetails>();
ExtremeDetails current = null;
foreach (var ex in extremes.OrderBy(e => e.Date))
{
// check if the current is complete
if (current != null && (current.Date.Date != ex.Date.Date || current.HighDate != default(DateTime)))
{
// add it
extremedetails.Add(current);
current = null;
}
// check if we need to create a new one
if (current == null)
{
current = new ExtremeDetails()
{
Date = ex.Date.Date
};
}
// add the tide info
if (ex.Type.Equals("h", StringComparison.OrdinalIgnoreCase))
{
if (current.HighDate != default(DateTime))
{
throw new Exception("Invalid high tide");
}
current.HighDate = ex.Date;
current.HighValue = ex.Value;
}
else if (ex.Type.Equals("l", StringComparison.OrdinalIgnoreCase))
{
if (current.LowDate != default(DateTime))
{
throw new Exception("Invalid low tide");
}
current.LowDate = ex.Date;
current.LowValue = ex.Value;
}
else
{
throw new Exception($"unknown extreme type {ex.Type}");
}
}
if (current != null)
{
extremedetails.Add(current);
}
var now = DateTime.Now;
var rowheight = 24f * Ratio;
var margin = 20f * Ratio;
var headerfontsize = 20f * Ratio;
var headerfontname = "Courier New"; // "Eras Light ITC";
var datafontsize = 18f * Ratio;
var datafontname = "Courier New";
var point = new Point()
{
X = 0f, Y = 0f
};
try
{
await Canvas.SuspendLayout();
// clear
Canvas.Clear(RGBA.Black);
Canvas.Text(RGBA.White, point, $"{now:MMM dd, yyyy} {Prediction.Location}", headerfontsize, headerfontname);
//
// tide extremes
//
point.Y = (rowheight * 1.5f);
point.X = (datafontsize * 4f);
Canvas.Text(RGBA.White, point, "low", datafontsize, datafontname);
point.X = (datafontsize * 17f);
Canvas.Text(RGBA.White, point, "high", datafontsize, datafontname);
var prvdate = default(DateTime);
foreach (var ex in extremedetails)
{
if (ex.Date.Date >= now.Date && point.Y < (Canvas.Height - (rowheight * 2)))
{
point.Y += rowheight;
if (!prvdate.Date.Equals(ex.Date.Date))
{
point.Y += (rowheight / 4f);
point.X = 0f;
Canvas.Text(RGBA.White, point, $"{ex.Date:ddd}", datafontsize, datafontname);
}
if (ex.LowDate != default(DateTime))
{
point.X = (datafontsize * 4f);
Canvas.Text(RGBA.White, point, $"{ex.LowDate:hh:mm tt} {(ex.LowValue > 0f ? " " : "")}{ex.LowValue:f2}", datafontsize, datafontname);
}
if (ex.HighDate != default(DateTime))
{
point.X = (datafontsize * 16f);
Canvas.Text(RGBA.White, point, $"{ex.HighDate:hh:mm tt} {(ex.HighValue < 10f ? " " : "")}{ex.HighValue:f2}", datafontsize, datafontname);
}
prvdate = ex.Date;
}
}
}
finally
{
await Canvas.ResumeLayout();
}
// fire that the frame is done
if (OnRendered != null)
{
OnRendered();
}
// set state back to not running
System.Threading.Volatile.Write(ref FrameLock, 0);
}