Cumulative Volume Delta[MIT]

Cumulative Volume Delta Depth[MIT]
This indicator provides a simplified approximation of Cumulative Volume Delta based on candlestick structure, helping to estimate short-term aggressive buying vs. selling pressure.

Core Calculation Logic:
Delta ≈ Volume × (Close - Open) / (High - Low)
- Positive Delta when the candle has a strong bullish body (more aggressive buying)
- Negative Delta when the candle has a strong bearish body (more aggressive selling)
- Near zero when the body is very small (indecision / balanced pressure)

Key Features:
- Column chart shows cumulative Delta (resets on new day by default)
- Orange line = smoothed Delta (default 5-period SMA)
- Teal tint for positive values, maroon tint for negative values
- Zero line for easy visual reference of net buying/selling shifts

Use Cases:
- Identify short-term buying/selling dominance
- Spot divergences (e.g. price makes new high but Delta fails to confirm → potential exhaustion)
- Works best on high-volume instruments (futures, crypto, liquid stocks)

Limitations:
- This is an approximation based on OHLC structure, NOT real tick-by-tick order flow
- Long shadows, small bodies, gaps, or low-volume bars may distort the result
- Best used in combination with other volume/price tools (VWAP, OBV, volume spikes, etc.)

Parameters:
- Cumulative Period: Controls lookback/reset logic (default 200 bars)
- Smoothing Period: Length of Delta moving average (default 5)
- Show MA: Toggle orange smoothed line on/off


这是一个基于K线形态粗估的累计成交量Delta指标，用于近似判断短期内主动买方与主动卖方的力量对比。

核心计算逻辑：
Delta ≈ Volume × (Close - Open) / (High - Low)
- 当阳线实体较长时，Delta为正值（偏向买方主动）
- 当阴线实体较长时，Delta为负值（偏向卖方主动）
- 小实体或十字星时Delta接近0

指标特点：
- 柱状图显示累计Delta（可每日重置）
- 橙色线为Delta的平滑均线（默认5周期，可调）
- 正值区域用青色系着色，负值区域用酒红色系着色
- 零轴辅助线，便于观察多空转折

适用场景：
- 辅助判断日内/短线多空力量变化
- 结合价格走势观察是否有背离（价格创新高但Delta不创新高，可能见顶）
- 适合期货、加密货币、活跃股票等成交量较大的品种

局限性：
- 这只是基于K线结构的近似估算，并非真实逐笔方向分类
- 对长影线、小实体K线或跳空行情可能失真
- 建议结合其他量价指标（如VWAP、OBV、成交量放大）一起使用

参数说明：
- 累计周期：控制Delta是否每日/每周重置（默认200根，建议设大值保持连续性）
- 平滑周期：Delta平滑均线的长度（默认5）
- 显示均线：是否显示橙色平滑线