Touch Screen Shield

Hello! My project is a wheelchair controlled by touchscreen. I have Arduinouno and 2.4" TFT Touchscreenshield. I need to control the pixels of the touchscreenshield dividing it into four. For the Forward, Left, Right and Backward movement of the wheelchair. (example: using the upper part of the touchscreen, when you hold the upper part, it will function as forward and when you release it, it will stop.) Now, my problem is I don't have any ideas when programming using arduino. Help Please!! =( =( =( =( =( =( =( =( =( =( =( =( =( =( =( =( =( =( =( =( =( =( =( Thank you in advance! ^_^