Pine 脚本：根据 if 语句切换趋势线答案

【问题标题】：Pine script: Switch trendline based on if statementPine 脚本：根据 if 语句切换趋势线
【发布时间】：2021-07-08 08:32:58
【问题描述】：

如何根据 if 语句设置趋势线颜色和绘图，即如果股票数据 > 1 年，则使用趋势线 1，否则使用趋势线方法 2：

trend_1 = sma(close, 15)
trend_2 = sma(close, 30)

bearish = true

for i = 0 to trendConfirmationLength - 1
    bearish := bearish and (close[i] < trend[i])

bullish = not bearish

// Set the color of the plot based on whether we are bullish (green) or not (red)
c = bullish ? color.green : color.red

// Plot the trend line
trend = 
if (len(close) > 252)
   trend_1
if (len(close) < 252)
   trend_2

trend_plot = plot(trend, title='Trend', color = c)

谢谢

【问题讨论】：

标签： if-statement pine-script

【解决方案1】：

trend_1 = sma(close, 15)
trend_2 = sma(close, 30)

float trend = na

if bar_index >= 252
    trend := trend_1
else
    trend := trend_2

bool foundBearish = false
bool foundBullish = false

for i = 0 to trendConfirmationLength - 1
    if close[i] < trend[i]
        foundBearish := true
    else if close[i] > trend[i]
        foundBullish := true

bullish = foundBullish and not foundBearish
bearish = foundBearish and not foundBullish
neutral = not bullish and not bearish

color c = na
if bullish
    c := color.green
else if bearish
    c := color.red
else if neutral
    c := color.blue

trend_plot = plot(trend, title='Trend', color = c)

如果trendConfirmationLength 内的所有关闭都低于trend，则foundBearish 将为真，foundBullish 将为假（反之亦然）。如果foundBearsh 和foundBullish 都为真，这意味着我们在trend 的上方和下方都有关闭。

或者，您可以这样做以保持趋势颜色直到形成新趋势，而不是显示中性颜色。

color c = na
if bullish
    c := color.green
else if bearish
    c := color.red

trend_plot = plot(trend, title='Trend', color = fixnan(c))

【讨论】：