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In the first article related to the use of OLAP techniques in trading, we considered the general multidimensional data processing principles and provided ready-to-use MQL classes, which enable the practical application of OLAP for account history or trading report processing. However we implemented a simplified output of results as a text in the Experts logs. For a more efficient visual representation, you need to create a new class, a child of the Display interface, which can visualize OLAP data using graphics. This task requires a lot of preparatory work and concerns many different aspects which are not related to the OLAP. So let's put aside data processing and let's focus on the graphical interface of the MQL program.

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