APL

APL (Adaptive Power Line) is an adaptive trend channel indicator based on the energy distribution within a price range. It utilizes the highest and lowest prices over a specific period, constructing three core structures through a combination of different exponential weights: the upper band (In Up), the lower band (In Dn), and the middle band (Mid). Unlike traditional channels, APL does not directly use linear averages but instead employs a power-weighted approach, allowing it to more accurately reflect the strength of price movements within a range.

The upper band emphasizes the weight of the highest price, more closely reflecting upward price momentum; the lower band emphasizes the weight of the lowest price, used to depict downward pressure; and the middle band, as the geometric median, reflects the equilibrium point and true center of the price range. This structure maintains smoothness while quickly adapting to fluctuations.

The three structural lines of APL can be used to identify trend direction, determine support and resistance levels, and observe the degree of price deviation within the range. When the price approaches or breaks through the upper band, it signifies increased upward momentum; approaching the lower band reflects dominant downward momentum; and fluctuations around the middle band indicate a balanced oscillation within the range. APL is simple yet effective, and is a highly applicable auxiliary tool for locating trend rhythms and range energy.