EMA Fibonacci Trend

// This Pine Script® code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © kimteagyun0413

//@version=6
indicator("EMA Fibonacci Trend", overlay = true)

// Calculate logarithmic close price / 로그 종가 계산
log_close = math.log10(close)

// Calculate 200-period Exponential Moving Average / 200일 지수이동평균 계산
ema200 = ta.ema(close, 200)

// Calculate volatility factor using ATR / ATR을 사용한 변동성 팩터 계산
v_factor = ta.atr(14) / close  

// Define range for extension (upward) / 확장 범위 정의 (상승)
range_up = ema200 * v_factor * 2

// Define range for retracement (downward) - Enhanced retracement range / 되돌림 범위 정의 (하락) - 되돌림폭 강화
range_down = ema200 * v_factor * 8

// Function to calculate Fibonacci retracement levels / 피보나치 되돌림 레벨 계산 함수
fibo_retrace(level) =>
    ema200 - (range_down * level)

// Function to calculate Fibonacci extension levels / 피보나치 확장 레벨 계산 함수
fibo_extension(level) =>
    ema200 + (range_up * level)

// Fibonacci retracement levels (below EMA200) / 피보나치 되돌림 레벨 (EMA200 아래)
level_0 = fibo_retrace(1)      // 0% - Full retracement / 0% - 전체 되돌림
level_236 = fibo_retrace(0.236)  // 23.6%
level_382 = fibo_retrace(0.382)  // 38.2%
level_50 = fibo_retrace(0.5)     // 50%
level_618 = fibo_retrace(0.618)  // 61.8%
level_786 = fibo_retrace(0.786)  // 78.6%

// Fibonacci extension levels (above EMA200) / 피보나치 확장 레벨 (EMA200 위)
level_1272 = fibo_extension(1.272)  // 127.2%
level_1618 = fibo_extension(1.618)  // 161.8%
level_2618 = fibo_extension(2.618)  // 261.8%
level_3618 = fibo_extension(3.618)  // 361.8%
level_4236 = fibo_extension(4.236)  // 423.6%

// Plot extension levels (above EMA200) / 확장 레벨 표시 (EMA200 위)
plot(level_4236, color = color.red, linewidth = 1)
plot(level_3618, color = color.orange, linewidth = 1)
plot(level_2618, color = color.yellow, linewidth = 1)
plot(level_1618, color = color.green, linewidth = 1)
plot(level_1272, color = color.aqua, linewidth = 1)

// Plot EMA200 baseline / EMA200 기준선 표시
plot(ema200, color = color.white, linewidth = 1)

// Plot retracement levels (below EMA200) / 되돌림 레벨 표시 (EMA200 아래)
plot(level_786, color = color.aqua, linewidth = 1)
plot(level_618, color = color.blue, linewidth = 1)
plot(level_50, color = color.green, linewidth = 1)
plot(level_382, color = color.yellow, linewidth = 1)
plot(level_236, color = color.orange, linewidth = 1)
plot(level_0, color = color.red, linewidth = 1)