/// <summary>Generate a piece of the graphics for 'x'</summary>
private ChartGfxPiece CreatePiece(double x, RangeF missing)
{
Debug.Assert(missing.Contains(x));
using (Lock())
{
// Find the nearest point in the data to 'x'
var idx = m_data.BinarySearch(pt => pt.xf.CompareTo(x), find_insert_position: true);
// Convert 'missing' to an index range within the data
var idx_missing = new RangeI(
m_data.BinarySearch(pt => pt.xf.CompareTo(missing.Beg), find_insert_position: true),
m_data.BinarySearch(pt => pt.xf.CompareTo(missing.End), find_insert_position: true));
// Limit the size of 'idx_missing' to the block size
const int PieceBlockSize = 4096;
var idx_range = new RangeI(
Math.Max(idx_missing.Beg, idx - PieceBlockSize),
Math.Min(idx_missing.End, idx + PieceBlockSize));
// Create graphics over the data range 'idx_range'
//todo: this isn't right... need to handle this function returning 'failed to create piece'
switch (Options.PlotType)
{
default: throw new Exception($"Unsupported plot type: {Options.PlotType}");
case EPlotType.Point:
{
return(idx_range.Size > 0
? CreatePointPlot(idx_range)
: new ChartGfxPiece(null, missing));
}
case EPlotType.Line:
{
return(idx_range.Size > 1
? CreateLinePlot(idx_range)
: new ChartGfxPiece(null, missing));
}
case EPlotType.StepLine:
{
return(idx_range.Size > 1
? CreateStepLinePlot(idx_range)
: new ChartGfxPiece(null, missing));
}
case EPlotType.Bar:
{
return(idx_range.Size > 1
? CreateBarPlot(idx_range)
: new ChartGfxPiece(null, missing));
}
}
}
}
