public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
double ActualWidth = 300;
double ActualHeight = 270;
ContinuousCollection <StockSaleTick> tickCollection =
(ContinuousCollection <StockSaleTick>)value;
if (tickCollection.Count == 0)
{
return(null);
}
double xConst = -tickCollection.First().TimeStamp.Ticks;
double xScale = ActualWidth / (tickCollection.Last().TimeStamp.Ticks + xConst);
double yMin = Math.Min(PreviousClosingPoint, tickCollection.Min(t => t.Price) - 0.1);
double yMax = Math.Max(PreviousClosingPoint, tickCollection.Max(t => t.Price) + 0.1);
double yConst = -yMax;
double yScale = ActualHeight / (yMin + yConst);
Func <double, double> yConvert = tickPrice => yScale * (tickPrice + yConst);
Func <double, double> xConvert = tickTime => xScale * (tickTime + xConst);
Func <StockSaleTick, Point> ptConvert = tick => new Point(xConvert(tick.TimeStamp.Ticks),
yConvert(tick.Price));
PointCollection points = new PointCollection();
for (int i = 0; i < tickCollection.Count; i++)
{
Point pt = ptConvert(tickCollection[i]);
points.Add(pt);
}
return(points);
}
void _simulationTimer_Elapsed(object sender, ElapsedEventArgs e)
{
double newPrice;
double oldPrice;
Random rnd = new Random();
double variance = rnd.NextDouble() * 1.50; // stock can change +- 1.50
if (_tickerData.Count > 0)
{
oldPrice = _tickerData.Last().Price;
if (rnd.Next(0, 4) > 1)
{
newPrice = oldPrice - variance;
}
else
{
newPrice = oldPrice + variance;
}
}
else
{
newPrice = 100;
}
// Simulation values.
StockSaleTick newTick = new StockSaleTick()
{
Price = newPrice,
TimeStamp = DateTime.Now,
Symbol = "AAPL",
Quantity = rnd.Next(50) + 50 // QTY range: 50-100
};
_tickerData.Add(newTick);
newTick = new StockSaleTick()
{
Price = newPrice,
TimeStamp = DateTime.Now,
Symbol = "IBM",
Quantity = rnd.Next(50) + 50 // QTY range: 50-100
};
_tickerData.Add(newTick);
NotifyPropertyChanged("GraphWindowTicks");
StockQuoteTick newQuote = new StockQuoteTick()
{
Price = newPrice - (newPrice * 0.05),
Side = QuoteSide.Bid,
Quantity = rnd.Next(50) + 50,
Symbol = "AAPL",
TimeStamp = DateTime.Now
};
_allQuotes.Add(newQuote);
_allQuotes.Add(newQuote);
newQuote = new StockQuoteTick()
{
Price = newPrice + (newPrice * 0.05),
Side = QuoteSide.Ask,
Quantity = rnd.Next(50) + 50,
Symbol = "AAPL",
TimeStamp = DateTime.Now
};
_allQuotes.Add(newQuote);
}