Drawing Tools can be applied, moved, and formatted, directly on a chart, providing tremendous flexibility. Many drawing tools allow you to analyze new data on a chart by extending the drawing object to the left or to the right of the chart. You can use them to call attention to any area of a chart you wish.
The tool calculates the market retracement in precents from the trend and rollback durations.
Price 1 is the beginning point — important high (low);
Price 2 is the Main point — the opposite high (low) of Price 1;
Price 3 is the retracement point — the intermediate high (low) for which you want to calculate the percent retracement.