Trendline Breakout Detector for Amibroker (AFL)

// ================================================
// AFL: Simple Trendline Breakout Indicator
// Author: ChatGPT (original)
// Description: Highlights bullish and bearish breakouts
// ================================================

// Inputs
Period = Param("Trend Period", 20, 5, 100, 1);
BreakoutMultiplier = Param("Breakout Multiplier", 1.5, 0.5, 5, 0.1);

// Calculate highs and lows for trendline
HH = HHV(High, Period);
LL = LLV(Low, Period);

// Calculate simple breakout levels
BullishBreakout = HH + (HH - LL) * BreakoutMultiplier * 0.1;
BearishBreakout = LL - (HH - LL) * BreakoutMultiplier * 0.1;

// Signals
Buy = Close > BullishBreakout;
Sell = Close < BearishBreakout;

// Plotting
Plot(Close, "Close", colorBlack, styleCandle);
Plot(BullishBreakout, "Bullish Breakout", colorGreen, styleLine | styleThick);
Plot(BearishBreakout, "Bearish Breakout", colorRed, styleLine | styleThick);

PlotShapes(Buy * shapeUpArrow, colorGreen, 0, Low, -10);
PlotShapes(Sell * shapeDownArrow, colorRed, 0, High, -10);

// Add commentary
Filter = Buy OR Sell;
AddColumn(Close, "Close");
AddColumn(Buy, "Buy Signal");
AddColumn(Sell, "Sell Signal");