public override void ViewWillAppear(bool animated)
{
base.ViewWillAppear(animated);
if (_timer == null)
{
_timer = NSTimer.CreateRepeatingScheduledTimer(0.01, (timer) =>
{
for (var i = 0; i < 500; i++)
{
_lineDataSeries.UpdateYAt(i, Math.Sin(i * 0.1 + _phase));
_scatterDataSeries.UpdateYAt(i, Math.Cos(i * 0.1 + _phase));
}
_phase += 0.01;
_surface.InvalidateElement();
});
}
}
private void OnNewPrice(PriceBar price)
{
// Update the last price, or append?
double smaLastValue;
if (_lastPrice.DateTime == price.DateTime)
{
_ohlcDataSeries.Update(_ohlcDataSeries.Count - 1, price.Open, price.High, price.Low, price.Close);
smaLastValue = _sma50.Update(price.Close).Current;
_xyDataSeries.UpdateYAt(_xyDataSeries.Count - 1, smaLastValue);
}
else
{
_ohlcDataSeries.Append(price.DateTime, price.Open, price.High, price.Low, price.Close);
smaLastValue = _sma50.Push(price.Close).Current;
_xyDataSeries.Append(price.DateTime, smaLastValue);
// If the latest appending point is inside the viewport (i.e. not off the edge of the screen)
// then scroll the viewport 1 bar, to keep the latest bar at the same place
var visibleRange = MainSurface.XAxes[0].VisibleRange;
if (visibleRange.MaxAsDouble > _ohlcDataSeries.Count)
{
visibleRange.SetMinMaxDouble(visibleRange.MinAsDouble + 1, visibleRange.MaxAsDouble + 1);
}
}
Activity.RunOnUiThread(() =>
{
_ohlcAxisMarker.SetBackgroundColor((price.Close >= price.Open ? StrokeUpColor : StrokeDownColor).ToColor());
});
_ohlcAxisMarker.Y1Value = price.Close;
_smaAxisMarker.Y1Value = smaLastValue;
_lastPrice = price;
}
private void OnNewPrice(PriceBar price)
{
InvokeOnMainThread(() =>
{
// Update the last price, or append?
double smaLastValue;
if (_lastPrice.DateTime == price.DateTime)
{
_ohlcDataSeries.Update(_ohlcDataSeries.Count - 1, price.Open, price.High, price.Low, price.Close);
smaLastValue = _sma50.Update(price.Close).Current;
_xyDataSeries.UpdateYAt(_xyDataSeries.Count - 1, smaLastValue);
}
else
{
_ohlcDataSeries.Append(price.DateTime, price.Open, price.High, price.Low, price.Close);
smaLastValue = _sma50.Push(price.Close).Current;
_xyDataSeries.Append(price.DateTime, smaLastValue);
// If the latest appending point is inside the viewport (i.e. not off the edge of the screen)
// then scroll the viewport 1 bar, to keep the latest bar at the same place
var xaxis = Runtime.GetNSObject <SCICategoryDateTimeAxis>(MainSurface.XAxes[0].Handle);
var visibleRange = Runtime.GetNSObject <SCIDoubleRange>(xaxis.VisibleRange.Handle);
if (visibleRange.Max > _ohlcDataSeries.Count)
{
MainSurface.XAxes[0].VisibleRange = new SCIDoubleRange(visibleRange.Min + 1, visibleRange.Max + 1);
}
}
_ohlcAxisMarker.Style.BackgroundColor = (price.Close >= price.Open ? StrokeUpColor : StrokeDownColor).ToColor();
_ohlcAxisMarker.Position = price.Close;
_smaAxisMarker.Position = smaLastValue;
_lastPrice = price;
});
}