/// <summary>
/// Creates a plot line instance (if necessary)
/// </summary>
/// <param name="source">The data chart the line is a part of</param>
private void CreatePlotLine(DataChart source)
{
// Ensure the data has been generated
if (Data.Columns.Contains(Expression))
{
// Remove any previous plot
if (Plot != null)
{
Plot.Remove(source);
Plot = null;
}
// Create a new plot
PlotLineCreator creator;
Type expressionType = Data.Columns[Expression].DataType;
if (!LineCreators.TryGetValue(expressionType, 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);
Plot.SetData(Data);
Plot.Color = Color;
if (preserveAxisPosition)
{
source.Plot.XAxis1.WorldMin = worldMin;
source.Plot.XAxis1.WorldMax = worldMax;
}
}
}
/// <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;
}
}