public static LineAnnotation CreateChartLineAnnotation(IDataSeries series, DateTime date1, IComparable value1, DateTime date2, IComparable value2)
{
var startIndex = series.FindIndex(date1, SearchMode.Nearest);
var endIndex = series.FindIndex(date2, SearchMode.Nearest);
// Would be good to use ((ICategoryCoordinateCalculator)surface.XAxis.GetCurrentCoordinateCalculator()).TransformDataToIndex(date1) but how to get the surface?
return(new LineAnnotation
{
X1 = date1 <(DateTime)series.XMin || date1> (DateTime) series.XMax ? (IComparable)date1 : startIndex,
X2 = date2 <(DateTime)series.XMin || date2> (DateTime) series.XMax ? (IComparable)date2 : endIndex,
Y1 = value1,
Y2 = value2
});
}
private static void AddLineAnnotations(
List <DatePrice> prices, IDataSeries series, AnnotationCollection annotations, Color colour)
{
int? startIndex = null;
DateTime?startDate = null;
decimal? currentPrice = null;
foreach (var p in prices)
{
if (p.Price != currentPrice)
{
// Price changed
if (currentPrice != null && startIndex != null)
{
var endIndex = series.FindIndex(p.Date.ToLocalTime(), SearchMode.Nearest);
if (endIndex == startIndex.Value)
{
endIndex++;
}
var brush = new SolidColorBrush(colour)
{
Opacity = 0.3
};
var annotation = new LineAnnotation
{
X1 = startDate, //startIndex.Value,
X2 = p.Date.ToLocalTime(), //endIndex,
Y1 = currentPrice.Value,
Y2 = currentPrice.Value,
Stroke = brush
};
annotations.Add(annotation);
}
startIndex = series.FindIndex(p.Date.ToLocalTime(), SearchMode.Nearest);
startDate = p.Date.ToLocalTime();
currentPrice = p.Price;
}
}
}
public static void AddHorizontalLine(decimal price, DateTime start, DateTime end, IDataSeries dataSeries,
AnnotationCollection annotations, Trade trade, Color colour, bool extendLeftAndRight = false,
bool extendRightIfZeroLength = false, DoubleCollection strokeDashArray = null)
{
var dateStartIndex = dataSeries.FindIndex(start, SearchMode.RoundDown);
var dateEndIndex = dataSeries.FindIndex(end, SearchMode.RoundUp);
if (extendLeftAndRight)
{
dateStartIndex -= 4;
}
if (dateStartIndex < 0)
{
dateStartIndex = 0;
}
if (extendLeftAndRight)
{
dateEndIndex += 4;
}
if (extendRightIfZeroLength && dateStartIndex == dateEndIndex)
{
dateEndIndex++;
}
var lineAnnotation = new LineAnnotation
{
DataContext = trade,
X1 = dateStartIndex,
Y1 = price,
X2 = dateEndIndex,
Y2 = price,
StrokeThickness = 3,
Opacity = 0.8,
Stroke = new SolidColorBrush(colour)
};
if (strokeDashArray != null)
{
lineAnnotation.StrokeDashArray = strokeDashArray;
}
annotations.Add(lineAnnotation);
}
/// <summary>
/// Because SciChart messes up lines that use DateTime but are not correctly on a axis point (the line appears to move
/// while scrolling) use index instead of DateTime apart from when the DateTime is after the last data point - in this
/// situation use DateTime, otherwise FindIndex will just return the latest chart point.
/// </summary>
/// <param name="data"></param>
/// <param name="date"></param>
/// <param name="positionType"></param>
/// <returns></returns>
public static IComparable FindChartPosition(IDataSeries data, DateTime date, ref PositionType?positionType)
{
if ((positionType != null && positionType == PositionType.DateTime) || date > (DateTime)data.XMax)
{
positionType = PositionType.DateTime;
return(date);
}
else
{
positionType = PositionType.Int;
return(data.FindIndex(date, SearchMode.Nearest));
}
}
