/// <summary>
/// Generates the data to use in the plot line
/// </summary>
/// <param name="source"></param>
public void Generate(DataChart <T> source)
{
this.Data = new DataTable();
Data.Columns.Add(source.XAxis, source.getExpressionType(source.XAxis, source.XAxisGetValue));
Data.Columns.Add(Expression, source.getExpressionType(Expression, GetValue));
List <string> symbols = source.GetSymbolList(Symbol);
foreach (var s in symbols)
{
List <StockDataSet <T> > sources;
if (!source.DataSets.TryGetValue(s, out sources))
{
return;
}
// Create a table of each data point in the specified range
for (int i = 0; i < sources.Count; i++)
{
if (sources[i].Start >= source.Start)
{
sources[i].Load(source.Session);
for (int j = 0; j < sources[i].Count; j++)
{
if (sources[i].Time(j) <= source.End)
{
// Add the point to the table
Data.Rows.Add(source.XAxisGetValue(sources[i], j), GetValue(sources[i], j));
}
else
{
break;
}
}
}
}
}
// Update the line plot data
if (Plot != null)
{
Plot.SetData(Data);
}
}
/// <summary>
/// Sets a new expression for the plot line
/// </summary>
/// <param name="source">The data source</param>
/// <param name="expression">The new expression to set</param>
public void SetExpression(DataChart <T> source, string expression)
{
System.Drawing.Color c;
if (Plot != null)
{
c = this.Color;
Plot.Remove(source);
Plot = null;
}
else
{
c = source.PlotLineColors.Dequeue();
source.PlotLineColors.Enqueue(c); // Add the color to the end of the list so that it can be re-used if needed
}
this.Expression = expression;
this.GetValue = getExpressionEvaluator(expression);
Generate(source);
PlotLineCreator creator;
if (!LineCreators.TryGetValue(source.getExpressionType(Expression, GetValue), out creator))
{
creator = DefaultCreator;
}
bool preserveAxisPosition = (source.Plot.XAxis1 != null);
double worldMin = preserveAxisPosition ? source.Plot.XAxis1.WorldMin : 0;
double worldMax = preserveAxisPosition ? source.Plot.XAxis1.WorldMax : 0;
Plot = creator(source, this);
this.Color = c;
if (preserveAxisPosition)
{
source.Plot.XAxis1.WorldMin = worldMin;
source.Plot.XAxis1.WorldMax = worldMax;
}
}
