Supertrend with Percentage Hysteresis

This Pine Script indicator is designed to generate buy and sell signals based on the Supertrend indicator, with an added layer of hysteresis to filter out small, insignificant price fluctuations. It provides visual cues through background coloring and buy/sell arrows.

Key Features:

Supertrend Calculation:
The script calculates the Supertrend indicator using the Average True Range (ATR).
Users can customize the ATR period and multiplier through input parameters.
It offers the option to choose between two ATR calculation methods.

Percentage-Based Hysteresis:
To prevent signals from flipping back and forth due to minor price changes, the script incorporates a percentage-based hysteresis.
Users can adjust the hysteresis percentage through the "Hysteresis Percentage" input.
This feature ensures that a signal change only occurs when the price moves beyond a certain percentage threshold, effectively filtering out noise.

Buy and Sell Signal Generation:
Buy signals are generated when the Supertrend indicates an uptrend and the price crosses above a calculated hysteresis level.
Sell signals are generated when the Supertrend indicates a downtrend and the price crosses below a calculated hysteresis level.
The script stores the previous trend, so signals are only generated when the trend changes.

Visual Cues:
Buy/Sell Arrows: Green upward-pointing triangles are plotted below the chart for buy signals, and red downward-pointing triangles are plotted above the chart for sell signals.
Background Coloring: The background below the chart is colored green during buy signals, and the background above the chart is colored red during sell signals.
The Supertrend lines themselves are not plotted, leaving a cleaner chart.

Alerts:
The script includes alert conditions for buy and sell signals, allowing users to receive notifications when signals are generated.

Input Parameters:

ATR Period: The period used to calculate the Average True Range (ATR).
ATR Multiplier: The multiplier applied to the ATR.
Change ATR Calculation Method?: A boolean option to switch between different ATR calculation methods.
Hysteresis Percentage: The percentage threshold that the price must move beyond to trigger a signal change.

How It Works:

Supertrend Calculation: The script first calculates the Supertrend indicator based on the user-defined parameters.
Hysteresis Levels: It then calculates the hysteresis levels based on the Supertrend lines and the hysteresis percentage.
Signal Generation: The script monitors the Supertrend direction and price movements. When the price crosses a hysteresis level in the opposite direction of the current trend, a signal is generated.
Visual and Alert Outputs: The script plots arrows, colors the background, and triggers alerts based on the generated signals.

Use Cases:

This indicator is useful for traders who want to identify potential trend reversals while minimizing the impact of short-term price fluctuations.
It can be used in various markets and timeframes, and the input parameters can be adjusted to suit different trading styles.

Important Notes:

Like any indicator, the Supertrend with Percentage Hysteresis is not foolproof and should be used in conjunction with other forms of technical analysis.
Experiment with the input parameters to find the optimal settings for your trading strategy.
This script does not plot the supertrend lines, only the buy/sell signals, and the background coloring.