PDF Coordinate System
PDF uses a bottom-left origin — the point (0, 0) is at the bottom-left of the page, with Y increasing upward. This is the opposite of most screen coordinate systems.
PDF uses a bottom-left origin — the point (0, 0) is at the bottom-left of the page, with Y increasing upward. This is the opposite of most screen coordinate systems.
A full definition for this term is coming soon.