All graphical operations are performed using a Graphics object. This object encapsulates a context for drawing to a particular target entity, including the current drawing color, clip region, line style, and so on.
11.3.1. Coordinate System
The coordinate system's default origin is located at the upper-left corner, with the numeric values of the x-coordinates monotonically increasing from left to right, and the numeric values of the y-coordinates monotonically increasing from top to bottom.
Applications may assume that the horizontal and vertical values of the coordinate system represent equal distances on the actual device display. If the shape of the pixels of the device is significantly different from square, the device does ...