Donchian Channels + Fibs

//version=6
indicator(title="Donchian Channels + Fibs", shorttitle="DC Fibs", overlay=true, timeframe="", timeframe_gaps=true)

// --- 1. 输入设置 ---
length = input.int(20, minval = 1, title="Length")
offset = input.int(0, "Offset")
show_fibs = input.bool(true, "Show Fib Levels")

// --- 2. 核心计算 ---
lower = ta.lowest(length) // 0.0 (下轨)
upper = ta.highest(length) // 1.0 (上轨)
basis = math.avg(upper, lower) // 0.5 (中轨)
range_val = upper - lower // 高度

// --- 3. 斐波那契计算 ---
f_786 = lower + range_val * 0.786
f_618 = lower + range_val * 0.618
f_382 = lower + range_val * 0.382
f_236 = lower + range_val * 0.236

// --- 4. 绘图 (已修复样式错误) ---

// 上下轨 (最粗实线)
u = plot(upper, "Upper 1.0", color = #2962FF, linewidth=2, offset = offset)
l = plot(lower, "Lower 0.0", color = #2962FF, linewidth=2, offset = offset)

// 中轴 (中等实线)
plot(basis, "Basis 0.5", color = #FF6D00, linewidth=1, offset = offset)

// 斐波那契内部线
// 修复点：删除了不支持的 style_dashed/dotted，改为默认实线，但保留了透明度

// 0.786 (偏红)
plot(show_fibs ? f_786 : na, "Fib 0.786", color = color.new(#f23645, 30), linewidth=1, offset = offset)

// 0.618 (橙色)
p_618 = plot(show_fibs ? f_618 : na, "Fib 0.618", color = color.new(color.orange, 30), linewidth=1, offset = offset)

// 0.382 (橙色)
p_382 = plot(show_fibs ? f_382 : na, "Fib 0.382", color = color.new(color.orange, 30), linewidth=1, offset = offset)

// 0.236 (偏绿)
plot(show_fibs ? f_236 : na, "Fib 0.236", color = color.new(#089981, 30), linewidth=1, offset = offset)

// --- 5. 背景填充 ---
fill(p_618, p_382, color = color.new(color.orange, 85), title="Golden Zone Fill")
fill(u, l, color = color.rgb(33, 150, 243, 95), title = "Background")