CIRCULAR ARC PROCESSING METHOD FOR DRAWING AND EDITING FUNCTION IN DRAWING INPUT DEVICE

PURPOSE: To surely change the center and radius of a circular arc with a simple operation without performing re-operations. CONSTITUTION: The circular arc for performing a shaping processing is specified from an input device in the step S1. Then, after reading the end points of the circular arc and a mouse cursor position by the input device to a central processing unit in the step S2, a circular arc rubber band passing through the three points is read from a storage device and displayed on a display device in the step S3. Thereafter, an optional point on the circular arc to be converted is specified by a mouse cursor in the step S4. When specifying is ended, conversion to the circular arc for which the center and radius of the circular arc is changed is performed without changing the end points of the circular arc in the step S5. Thereafter, the step S6 is advanced and the end points of the circular arc before the conversion are connected to the end points of a graphic or the end points are connected each other when the end points of the graphic are present near the end points.