GRAPHIC GENERATION DEVICE

摘要

PROBLEM TO BE SOLVED: To speedily obtain the circumferential coordinate of an end circle without operating a real number by obtaining relative X/Y displacement coordinate amounts and obtaining the coordinates of four apexes by means of adding the X/Y displacement coordinate amounts against the coordinates of the two end points of a straight line. SOLUTION: The coordinate value of a thick line apex P1 is calculated from the coordinate value of a center coordinate point PS and thick line relative position table values TX1 and TY1. The coordinate value of a thick line apex P2 is calculated from the coordinate value of the center coordinate point PS and thick line relative position table values TX2 and TY2. The coordinate values of thick line apexes P3 and P4 are similarly calculated. At the time of calculating the coordinate values of respective middle line apexes, the table values are added to the coordinate value of the center coordinate. The angle number K of the thick line relative position table is calculated from an angle AT for thick line relative position table. The coordinate value of the thick line apex P1 is calculated from the coordinate value of the center coordinate point PS and thick line relative position table values TX1 and TY1. The coordinate values of the thick line apexes P2-P4 are calculated. A thick line is drawn based on the coordinates of four apexes.