private void LiveUpdate(SimpleLineChart chart, MavlinkLog currentFlightLog, LogItemSchema schema)
{
// this method is running on a background task and it's job is to read an infinite stream of
// data values from the log and show them in the live scrolling chart.
CancellationTokenSource canceller = new CancellationTokenSource();
chart.Closed += (s, e) =>
{
canceller.Cancel();
};
var query = currentFlightLog.LiveQuery(schema, canceller.Token);
foreach (DataValue item in query)
{
if (item == null)
{
return;
}
chart.SetCurrentValue(item);
}
chart.Closed += (sender, e) =>
{
canceller.Cancel();
};
Debug.WriteLine("LiveUpdate terminating on schema item " + schema.Name);
}
private void InitializeChartData(LogItemSchema schema, SimpleLineChart chart, List <DataValue> values)
{
chart.SetData(new Model.DataSeries()
{
Name = schema.Name,
Values = values
});
}
private void OnChartClosed(object sender, EventArgs e)
{
SimpleLineChart chart = sender as SimpleLineChart;
ChartStack.RemoveChart(chart);
chart.LiveScrolling = false;
liveScrolling.Remove(chart);
LayoutCharts();
LogItemSchema item = (chart.Tag as LogItemSchema);
if (item != null)
{
UnselectCategory(item);
}
}
private void GraphItem(LogItemSchema schema)
{
if (schema.IsNumeric)
{
ChartStack.Visibility = Visibility.Visible;
ChartStack.UpdateLayout();
SimpleLineChart chart = new SimpleLineChart();
chart.Margin = defaultChartMargin;
chart.Focusable = false;
chart.Closed += OnChartClosed;
chart.LineColor = GetRandomColor();
chart.StrokeThickness = 1;
chart.Tag = schema;
if (currentFlightLog != null && schema.Root == currentFlightLog.Schema)
{
List <DataValue> values = new List <DataValue>(currentFlightLog.GetDataValues(schema, DateTime.MinValue, TimeSpan.MaxValue));
InitializeChartData(schema, chart, values);
// now turn on live scrolling...
chart.LiveScrolling = true;
// the X values are in microseconds (s0 the numerator is the speed of scrolling).
chart.LiveScrollingXScale = 50.0 / 1000000.0;
liveScrolling.Add(chart);
// now start watching the live update for new values that need to be added to this chart.
Task.Run(() =>
{
LiveUpdate(chart, currentFlightLog, schema);
});
}
else
{
List <DataValue> values = new List <DataValue>(GetSelectedDataValues(schema));
if (values.Count > 0)
{
InitializeChartData(schema, chart, values);
}
else
{
chart = null;
}
ShowStatus(string.Format("Found {0} data values", values.Count));
}
if (chart != null)
{
if (chartGroup != null)
{
chartGroup.AddChart(chart);
if (chartGroup.Parent == null)
{
ChartStack.AddChartGroup(chartGroup);
}
}
else
{
ChartStack.AddChart(chart);
}
LayoutCharts();
}
ConsoleButton.IsChecked = false;
SystemConsole.Hide();
}
else
{
StringBuilder sb = new StringBuilder();
foreach (var value in GetSelectedDataValues(schema))
{
sb.AppendLine(value.Label);
}
SystemConsole.Write(sb.ToString());
ConsoleButton.IsChecked = true;
SystemConsole.Show();
}
}
