Include new chart indicators

[rodrigo-brito]

We can create and initialize indicators for chats in Ninjabot.

Example:

ninjabot/examples/backtesting/main.go

Lines 58 to 63 in 516e750

	chart := plot.NewChart(plot.WithIndicators(
	indicator.EMA(8, "red"),
	indicator.EMA(21, "#000"),
	indicator.RSI(14, "purple"),
	indicator.Stoch(8, 3, "red", "blue"),
	))

A indicator is a simple struct that implements the follow interface:

type Indicator interface {
	Name() string
	Overlay() bool
	Metrics() []IndicatorMetric
	Load(dataframe *model.Dataframe)
}

Here, we have a simple example of Exponential Moving Average (EMA): https://github.com/rodrigo-brito/ninjabot/blob/516e75064107daf73495bf1d091b5dc1cba18c09/plot/indicator/ema.go

Indicators Roadmap

• Moving average (MA)
• Exponential moving average (EMA)
• Moving Average Convergence Divergence (MACD)
• Relative Strength Index (RSI)
• Percentage Price Oscillator (PPO)
• Parabolic SAR
• Average directional index
• Stochastic oscillator
• Bollinger bands
• Fibonacci retracement
• Williams Percent Range (%R)
• Commodity Channel Index (CCI)
• Ichimoku cloud
• On-Balance volume (OBV)
• Supertrend

[RobertKwiatkowski]

Hi,
This looks very interesting since I'm a little bit interested in trading (stocks, but still) and relatively new to GO.
If I'm correct all I have to do is to create new file for dedicated indicator which would implement the Indicator interface? Just similarly to the ema.go? If that's right I can work with SMA as it looks like the easiest one and then maybe tackle the harder indicators

[rodrigo-brito]

Hi @RobertKwiatkowski , exactly like ema.go. The format is very simple.