/// <summary>
/// Call this method when you turn on LiveScrolling.
/// </summary>
public void SetCurrentValue(DataValue value)
{
System.Threading.Interlocked.Exchange<DataValue>(ref currentValue, value);
}
private void SmoothScroll(DataValue newValue)
{
if (this.series == null)
{
this.series = new DataSeries() { Name = "", Values = new List<DataValue>() };
}
// we do not use the data value x coordinates right now because they are timestamp values
// and they bunch up and are not smooth...due to random network noise, so until we figure
// out something better the graph is smoothing out the x values.
double x = 0;
if (this.series.Values.Count > 0)
{
x = this.series.Values[this.series.Values.Count - 1].X + 1;
}
DataValue copy = new Model.DataValue()
{
X = x,
Y = newValue.Y
};
this.series.Values.Add(copy);
PathGeometry g = Graph.Data as PathGeometry;
if (g == null)
{
UpdateChart();
return;
}
PathFigure f = g.Figures[0];
if (ComputeScale() || g.Bounds.Width > 2 * this.ActualWidth)
{
// can't do incremental, have to reset scaled values.
if (this.series != null && this.series.Values.Count > 2 * this.ActualWidth)
{
// purge history since this is an infinite scrolling stream...
this.series.Values.RemoveRange(0, this.series.Values.Count - (int)this.ActualWidth);
System.Diagnostics.Debug.WriteLine("Trimming data series {0} back to {1} values", this.series.Name, this.series.Values.Count);
}
UpdateChart();
}
else
{
AddScaledValues(f, updateIndex, series.Values.Count);
Graph.UpdateLayout();
if (g.Bounds.Width >= this.ActualWidth)
{
Canvas.SetLeft(Graph, Canvas.GetLeft(Graph) - 1);
}
updateIndex = series.Values.Count;
}
}
internal DataValue GetDataValue(LogItemSchema schema, Message msg)
{
// we support 3 levels of nesting, so schema could be the row, the column or an array item.
LogItemSchema rowSchema = schema;
LogItemSchema columnSchema = schema;
LogItemSchema arraySchema = schema;
if (rowSchema.Parent != this.schema)
{
rowSchema = rowSchema.Parent;
}
if (rowSchema.Parent != this.schema)
{
columnSchema = rowSchema;
rowSchema = rowSchema.Parent;
}
StringBuilder textBuilder = new StringBuilder();
var row = msg.TypedValue;
if (row != null && row.GetType().Name == rowSchema.Type)
{
// get a time value for this message.
FieldInfo fi = row.GetType().GetField(columnSchema.Name, BindingFlags.Public | BindingFlags.Instance);
if (fi != null)
{
object value = fi.GetValue(row);
DataValue data = new DataValue()
{
X = msg.Timestamp.Ticks / 10, UserData = row
}; // microseconds (Ticks are in 100 nanoseconds).
// byte array is special (we treat this like text).
if (value is byte[])
{
textBuilder.Length = 0;
byte[] text = (byte[])value;
bool binary = false;
// see if this is binary or text.
for (int i = 0, n = text.Length; i < n; i++)
{
byte b = text[i];
if (b != 0 && b < 0x20 || b > 0x80)
{
binary = true;
}
}
for (int i = 0, n = text.Length; i < n; i++)
{
byte b = text[i];
if (b != 0)
{
if (binary)
{
textBuilder.Append(b.ToString("x2"));
textBuilder.Append(" ");
}
else
{
char ch = Convert.ToChar(b);
textBuilder.Append(ch);
}
}
}
data.Label = textBuilder.ToString();
}
else if (value is string)
{
data.Label = (string)value;
}
else
{
if (fi.FieldType.IsArray)
{
// then we are expecting an array selector as well...
Array a = (Array)value;
int index = 0;
int.TryParse(arraySchema.Name, out index);
if (a.Length > index)
{
value = a.GetValue(index);
}
}
data.Y = ConvertToNumeric(value);
data.Label = GetLabel(row, columnSchema.Name);
};
return(data);
}
}
return(null);
}
