Yo! I have both versions of Graff .to get straight lines on the android app is hard but for the notebook or PC, you hold the space bar down and you can draw straight lines unless you have a touch screen tablet with the android app you can use a clear ruler to make straight but it will fuckin scratch after a while! Try looking up a intuos 3graphics tablet that can plug into a tab or phone but you need a otg cable to go from micro USB to female USB !

word thx holmes . ima look into dat fo sho