Coordinate system and angle
The coordinate system refers directly to the display resolution of the module with the origin 0|0 placed in the lower left corner of the display. For example the EA uniTFTs028-A has a drawing field of 320 x 240 dots. Valid coordinates for this display are 0..319 and 0..239 hence.
Angles are given in the mathematical sense of rotation (counter-clockwise). 0° is horizontally right. Besides instruments rotation is available in 90° steps:
