| 摘要 |
PROBLEM TO BE SOLVED: To efficiently draw part (circular arc) of an extremely expanded circle in a two-dimensional CAD system. SOLUTION: The method for drawing part of the circle in the CAD system includes the steps for: determining the coordinates of four points indicating a rectangular display area for displaying a circle element which is part of the circle being a drawing target; operating the coordinates of intersections of the individual sides of the rectangle and the circle; and operating the coordinates of the part of the circle within the display area with angles formed of the coordinates of the intersections and the central coordinates of the circle as a starting angle and a final angle. COPYRIGHT: (C)2004,JPO |
