Goodtrade Expert Advisor

If there is at least one L point between two H points, search for a LL point in the interval between two H points. The candlestick with the lowest Low price will be the LL point. Generally, the LL point is not necessarily an L point. Search for candlesticks with the lowest Low price.

If there is at least one H point between two L points, search for a HH point in the interval between two L points. The candlestick with the highest High price will be the HH point. Generally, the HH point is not necessarily a H point. Search for candlesticks with the highest High price.

Connect LL and HH points to draw a ZigZag. The default color is yellow. The first step is finished.