programming issue for 2.4 TFT osciloscope project

hi i am not a professional Arduino programmer i need some help to build the osciloscope project. the osciloscope working on 50Hz i need to add zoom to working for more higher frequency i had attached my Arduino file and video

TFT2.9.1.ino (2.54 KB)

Osciloscope.zip (1.81 MB)

duplicate of Need some help to build 2.4tft Osciloscope - Project Guidance - Arduino Forum