It is about the code of moving shape.

matching shape can be subdivided between two approaches: feature-based and template-based matching. The feature-based approach uses the features of the search and template image, such as edges or corners, as the primary match-measuring metrics to fin

摇动摇摆棒，可以显示心形，“欢迎使用魔幻摇摇棒”等字形。-Shake sway bar, you can display heart-shaped, Welcome to the Magic shook his stick and other shape.