public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
double ActualWidth = 400;
double ActualHeight = 160;
ReadOnlyContinuousCollection <StockTransaction> tickCollection =
(ReadOnlyContinuousCollection <StockTransaction>)value;
if (tickCollection.Count == 0)
{
return(null);
}
double priceMin = Math.Min(PreviousClosingPrice, tickCollection.Min(t => t.Price));
double priceMax = Math.Max(PreviousClosingPrice, tickCollection.Max(t => t.Price));
double tickMin = tickCollection.Min(t => t.TimeStamp.Ticks);
double tickMax = tickCollection.Max(t => t.TimeStamp.Ticks);
double yScale = ActualHeight / (priceMax - priceMin);
double xScale = ActualWidth / Math.Min((tickMax - tickMin), _fiveMinuteWindow);
StockTransaction[] querySource = tickCollection.ToArray(); // turn CLINQ off
var newPoints =
from tick in querySource
select new Point
{
X = (tick.TimeStamp.Ticks - tickMin) * xScale,
Y = (ActualHeight - (tick.Price - priceMin) * yScale)
};
return(new PointCollection(newPoints.ToArray()));
}