$ Pinescript: Master Doji Candlestick Patterns

//@version=5
indicator("Doji Pattern Detector", overlay=true)

// User input for threshold to define a "small body"
bodyRatioThreshold = input.float(0.1, title="Doji Body Ratio Threshold (e.g., 0.1 for 10%)", minval=0.01, maxval=0.5)

// Calculate candle body size
bodySize = math.abs(close - open)

// Calculate total candle range
candleRange = high - low

// Check if it's a Doji (body size is very small relative to the candle's total range)
// Avoid division by zero if candleRange is 0 (occurs with Four Price Doji)
isDoji = if candleRange > 0
    bodySize / candleRange <= bodyRatioThreshold
else // Handle Four Price Doji case (open==high==low==close)
    true

// Plot signal on the chart
plotshape(isDoji, title="Doji Detected", location=location.belowbar, color=color.new(color.silver, 0), style=shape.circle, size=size.small)

// Alert condition (optional)
alertcondition(isDoji, title="Doji Detected", message="Doji Candlestick Pattern Detected!")

//@version=5
indicator("Specific Doji Patterns", overlay=true)

// Input for threshold to define a "small body"
bodyRatioThreshold = input.float(0.1, title="Doji Body Ratio Threshold (e.g., 0.1 for 10%)", minval=0.01, maxval=0.5)
// Input for wick ratio to define "long" or "short" wicks
wickRatioThreshold = input.float(0.4, title="Long Wick Ratio Threshold (e.g., 0.4 for 40%)", minval=0.1, maxval=0.9)

// Helper function to check for small body
isSmallBody(open_val, close_val, high_val, low_val) =>
    bodySize = math.abs(close_val - open_val)
    candleRange = high_val - low_val
    candleRange > 0 ? (bodySize / candleRange <= bodyRatioThreshold) : true // Handles Four Price Doji

// Calculate wick lengths
upperShadow = high - math.max(open, close)
lowerShadow = math.min(open, close) - low
totalRange = high - low

// --- Standard Doji ---
// Small body, relatively balanced upper and lower shadows (or overall short wicks)
isStandardDoji = isSmallBody(open, close, high, low) and
                 (upperShadow / totalRange > 0.1 and lowerShadow / totalRange > 0.1) // Some wicks
                 // More balanced wick check: math.abs(upperShadow - lowerShadow) / totalRange < 0.2

// --- Long-Legged Doji ---
// Small body, very long upper and lower shadows
isLongLeggedDoji = isSmallBody(open, close, high, low) and
                   upperShadow / totalRange >= wickRatioThreshold and
                   lowerShadow / totalRange >= wickRatioThreshold

// --- Dragonfly Doji ---
// Small body (or non-existent) at the top of the candle, long lower shadow, little to no upper shadow
isDragonflyDoji = isSmallBody(open, close, high, low) and
                  lowerShadow / totalRange >= wickRatioThreshold and
                  upperShadow / totalRange < bodyRatioThreshold * 0.5 // Upper shadow is tiny

// --- Gravestone Doji ---
// Small body (or non-existent) at the bottom of the candle, long upper shadow, little to no lower shadow
isGravestoneDoji = isSmallBody(open, close, high, low) and
                   upperShadow / totalRange >= wickRatioThreshold and
                   lowerShadow / totalRange < bodyRatioThreshold * 0.5 // Lower shadow is tiny

// --- Four Price Doji ---
// Open, high, low, close are all the same
isFourPriceDoji = (open == high) and (high == low) and (low == close)

// Plot shapes for detected patterns
plotshape(isStandardDoji,     title="Standard Doji",    location=location.belowbar, color=color.new(color.gray, 0), style=shape.circle, size=size.small, text="SD")
plotshape(isLongLeggedDoji,   title="Long-Legged Doji", location=location.belowbar, color=color.new(color.orange, 0), style=shape.circle, size=size.normal, text="LLD")
plotshape(isDragonflyDoji,    title="Dragonfly Doji",   location=location.belowbar, color=color.new(color.green, 0), style=shape.triangleup, size=size.normal, text="DFD")
plotshape(isGravestoneDoji,   title="Gravestone Doji",  location=location.abovebar, color=color.new(color.red, 0), style=shape.triangledown, size=size.normal, text="GSD")
plotshape(isFourPriceDoji,    title="Four Price Doji",  location=location.belowbar, color=color.new(color.purple, 0), style=shape.diamond, size=size.small, text="4PD")

// Alerts (optional)
alertcondition(isLongLeggedDoji, title="Long-Legged Doji Alert", message="Long-Legged Doji Detected!")
alertcondition(isDragonflyDoji, title="Dragonfly Doji Alert", message="Dragonfly Doji Detected!")
alertcondition(isGravestoneDoji, title="Gravestone Doji Alert", message="Gravestone Doji Detected!")

//@version=5
strategy("Doji with Trend Reversal Confirmation", overlay=true)

// Input for Moving Average length
maLength = input(50, "MA Length (for trend)")
ma = ta.ema(close, maLength) // Using EMA for trend detection

// Doji Pattern Detection (using a general Doji definition for simplicity)
bodyRatioThreshold = 0.1
bodySize = math.abs(close - open)
candleRange = high - low
isDoji = if candleRange > 0
    bodySize / candleRange <= bodyRatioThreshold
else
    true

// Trend Context:
// Potential Bullish Reversal: Doji after a downtrend AND near MA support
isPotentialBullishReversal = isDoji and close < ma and close[1] < ma[1] and ma > ma[1] // price below MA, MA sloping down
// Potential Bearish Reversal: Doji after an uptrend AND near MA resistance
isPotentialBearishReversal = isDoji and close > ma and close[1] > ma[1] and ma < ma[1] // price above MA, MA sloping up

// Plot signals
plotshape(isPotentialBullishReversal, title="Doji (Bullish Reversal Context)", location=location.belowbar, color=color.new(color.blue, 0), style=shape.arrowup, size=size.normal)
plotshape(isPotentialBearishReversal, title="Doji (Bearish Reversal Context)", location=location.abovebar, color=color.new(color.purple, 0), style=shape.arrowdown, size=size.normal)

// Plot MA
plot(ma, "Trend MA", color.blue)

//@version=5
indicator("Doji with Volume Confirmation", overlay=true)

// Doji Pattern Detection (from basic example)
bodyRatioThreshold = input.float(0.1, title="Doji Body Ratio Threshold", minval=0.01, maxval=0.5)
bodySize = math.abs(close - open)
candleRange = high - low
isDoji = if candleRange > 0
    bodySize / candleRange <= bodyRatioThreshold
else
    true

// Volume Confirmation:
// Volume on the Doji candle should be higher than average volume, indicating significant indecision.
avgVolume = ta.sma(volume, 20) // 20-period Simple Moving Average of Volume
isVolumeConfirmed = volume > avgVolume * 1.5 // Volume is 1.5x average

// Combined signal
confirmedDoji = isDoji and isVolumeConfirmed

// Plot confirmed signals
barcolor(confirmedDoji ? color.new(color.teal, 60) : na)

plotshape(confirmedDoji, title="Doji (Vol Confirmed)", location=location.belowbar, color=color.new(color.yellow, 0), style=shape.labeldown, size=size.small, text="Doji Vol")

// Optional: Plot volume for visual check
plot(volume, title="Volume", color=color.gray, style=plot.style_columns)
plot(avgVolume, title="Avg Volume", color=color.orange, style=plot.style_line)

//@version=5
indicator("Doji at S/R Zones", overlay=true)

// User input for threshold to define a "small body"
bodyRatioThreshold = input.float(0.1, title="Doji Body Ratio Threshold", minval=0.01, maxval=0.5)

// Define sensitivity for S/R zone detection
srTolerance = input.float(0.005, title="S/R Zone Tolerance (as % of price)", minval=0.001, maxval=0.02)

// Calculate candle body size
bodySize = math.abs(close - open)
candleRange = high - low
isDoji = if candleRange > 0
    bodySize / candleRange <= bodyRatioThreshold
else
    true

// Simple S/R line detection (e.g., using previous swing highs/lows)
// This is a simplified example; real S/R can be complex.
lookback = input(20, "S/R Lookback Periods")
prevHigh = ta.highest(high[1], lookback)
prevLow = ta.lowest(low[1], lookback)

// Check if Doji is near Resistance
isNearResistance = isDoji and math.abs(high - prevHigh) / high <= srTolerance and close > open // Bullish close might be a breakout failure or test
// Check if Doji is near Support
isNearSupport = isDoji and math.abs(low - prevLow) / low <= srTolerance and close < open // Bearish close might be a breakdown failure or test

// Plot signals
plotshape(isNearResistance, title="Doji at Resistance", location=location.abovebar, color=color.new(color.red, 0), style=shape.square, size=size.normal, text="R-Doji")
plotshape(isNearSupport, title="Doji at Support", location=location.belowbar, color=color.new(color.green, 0), style=shape.square, size=size.normal, text="S-Doji")

// Plot S/R lines (for visual confirmation)
plot(prevHigh, "Previous High (Resistance)", color.red, linewidth=1, style=plot.style_stepline)
plot(prevLow, "Previous Low (Support)", color.green, linewidth=1, style=plot.style_stepline)