// MACD柱子面积计算指标
// 作者: Claude AI
// 版本: 1.0

//@version=5
indicator("MACD柱子面积", shorttitle="MACD面积", overlay=false)

// MACD参数
fast_length = input.int(12, "快线长度", minval=1)
slow_length = input.int(26, "慢线长度", minval=1)
signal_length = input.int(9, "信号线长度", minval=1)

// 计算MACD
[macdLine, signalLine, histLine] = ta.macd(close, fast_length, slow_length, signal_length)

// 初始化面积变量
var float upArea = 0.0
var float downArea = 0.0

// 检测柱子正负性并累加面积
if histLine > 0
    upArea := upArea + histLine
    // 当从负值转为正值时，重置下跌面积
    if histLine[1] < 0
        downArea := 0.0
else if histLine < 0
    downArea := downArea + math.abs(histLine)
    // 当从正值转为负值时，重置上涨面积
    if histLine[1] > 0
        upArea := 0.0

// 绘制结果
plot(upArea, "上涨段面积", color=color.green, style=plot.style_area)
plot(downArea, "下跌段面积", color=color.red, style=plot.style_area)
plot(histLine, "MACD柱状图", color=histLine >= 0 ? color.green : color.red, style=plot.style_histogram)
plot(macdLine, "MACD", color=color.blue)
plot(signalLine, "信号线", color=color.orange)

// 添加文字标签
var label upLabel = na
var label downLabel = na

if barstate.islast
    upLabel := label.new(
        bar_index, upArea, 
        text="上涨面积: " + str.tostring(upArea, "#.##"),
        color=color.green, 
        style=label.style_label_down,
        textcolor=color.white)
    
    downLabel := label.new(
        bar_index, downArea, 
        text="下跌面积: " + str.tostring(downArea, "#.##"),
        color=color.red, 
        style=label.style_label_up,
        textcolor=color.white)
    
    label.delete(upLabel[1])
    label.delete(downLabel[1])