createVirtualTick method
Creates a virtual tick for crosshair display when cursor is outside data range. Each series type should implement this to return the appropriate tick type.
This method is responsible for creating a virtual data point that represents the cursor position when it's outside the actual data range. Different chart types will create different types of ticks - line charts create simple Tick objects, while candle charts create Candle objects with all OHLC values set to the same quote value.
Parameters:
epoch- The timestamp for the virtual tick.quote- The price/quote value for the virtual tick.
Returns: A virtual tick of the appropriate type for this series.
Implementation
@override
Tick createVirtualTick(int epoch, double quote) {
return Tick(epoch: epoch, quote: quote);
}