QuadCode脚本优化：仅在趋势首根K线生成买卖信号

问题背景 #

我有一款适配IQOption平台的QuadCode脚本，基于EMA13与MACD柱线的条件为K线上色：

• 当ema13 > ema13[1]且hist > hist[1]时，K线为绿色（看涨）
• 当ema13 < ema13[1]且hist < hist[1]时，K线为红色（看跌）
• 其余情况为中性色

统计显示，90%的情况下同色K线会连续出现1-2根。目前脚本会给所有符合上色条件的K线标注买卖信号，需要优化为仅在趋势启动的第一根符合上色条件的K线上生成信号。

解决方案思路 #

要实现仅在趋势启动首根K线出信号，核心是判断：

• 当前K线满足对应方向的上色条件
• 前一根K线不满足该方向的上色条件（即前一根为中性色或相反方向）

通过对比当前与前一根的条件状态，过滤掉连续同方向的信号，只保留趋势启动的第一根信号。

修改后的完整脚本 #

instrument {
    name = 'ETM PROFIT',
    short_name = 'ETM',
    icon = 'https://etmtradingbucket.s3.amazonaws.com/public/logo.png',
    overlay = true
}

Signal_period = input(5,"VIP | Signals Period",input.integer,1,1000,1)

input_group {
    "Compra Proxima vela",
    colorBuy = input { default = "green", type = input.color }, 
    visibleBuy = input { default = true, type = input.plot_visibility }
}

input_group {
    "Venda Proxima vela",
    colorSell = input { default = "red", type = input.color },
    visibleSell = input { default = true, type = input.plot_visibility }
}

input_group {
    "MACD",
    "Slow and fast EMA periods, used in MACD calculation",
    fast = input (12, "front.platform.fast period", input.integer, 1, 250),
    slow = input (26, "front.platform.fast period", input.integer, 1, 250)
}
input_group {
    "front.platform.signal-line",
    "Reference signal series period",
    signal_period = input (9, "front.period", input.integer, 1, 250)
}
input_group {
    "front.newind.emaperiod",
    ema_period = input (13, "front.period", input.integer, 1, 250)
}
input_group {
    "front.newind.barcolors",
    positive = input { default = "#2CAC40",   type = input.color },
    neutral  = input { default = "#C7CAD1", type = input.color },
    negative = input { default = "#DB4931",   type = input.color },
}
fastMA = ema(close, fast)
slowMA = ema(close, slow)
macd = fastMA - slowMA
signal = sma(macd, signal_period)
hist = macd - signal
ema13 = ema (close, ema_period)
local bar_color
        
if ema13 > ema13 [1] and hist > hist [1] then
    bar_color = positive
elseif ema13 < ema13 [1] and hist < hist [1] then
    bar_color = negative
else
    bar_color = neutral
end
plot_candle (open, high, low, close, "ES", bar_color)

// 基础条件：判断当前K线是否满足看涨/看跌上色条件
currentBuy = ema13 > ema13[1] and hist > hist[1]
currentSell = ema13 < ema13[1] and hist < hist[1]

// 前一根K线的条件状态
prevBuy = ema13[1] > ema13[2] and hist[1] > hist[2]
prevSell = ema13[1] < ema13[2] and hist[1] < hist[2]

// 优化后的信号条件：仅当前满足且前一根不满足对应方向时触发
buySignal = currentBuy and not prevBuy
sellSignal = currentSell and not prevSell

plot_shape(
    buySignal,
    "",
    shape_style.triangleup,
    shape_size.huge,    
    colorBuy,    
    shape_location.belowbar,
    0,
    "RX-Buy",
    "pink"
) 

plot_shape(
    sellSignal,
    "ENTER",
    shape_style.triangledown,
    shape_size.huge,
    colorSell,
    shape_location.abovebar,
    0,
    "RX-Sell",
    "salmon"
)

关键修改说明 #

1. 拆分基础条件与信号条件：
   • currentBuy/currentSell：判断当前K线是否符合上色条件
   • prevBuy/prevSell：判断前一根K线是否符合对应方向的上色条件
2. 优化信号触发逻辑：
   • buySignal：当前满足看涨条件，且前一根不满足看涨条件（趋势刚启动）
   • sellSignal：当前满足看跌条件，且前一根不满足看跌条件（趋势刚启动）
3. 替换原plot_shape的触发条件为新的buySignal和sellSignal

内容的提问来源于stack exchange，提问作者ROCKI