GRAPHIC DRAWING METHOD AND GRAPHIC DRAWING DEVICE

摘要

A graphic processing device is composed of a main storage device (102), a drawing control device (105) and a drawing device (110). The main storage device (102) stores data relative to the coordinates of plural graphics (103, 104). The drawing control device (105) reads out the data relative to the coordinates of the plural graphics stored in the main storage device, scans the coordinate data to calculate the coordinates of intersecting points of a scanning line and the plural graphics for each position of the scanning line. The drawing control device also decides an overlapping area (AND area) or a common area (OR area) of the plural graphics on the basis of the coordinates of the intersecting points of the plural graphics and the scanning line. The drawing device draws the overlapping area (AND area) and the common area (OR area) of the plural graphics as a graphic.