| 摘要 |
PROBLEM TO BE SOLVED: To generate a curve similar to a graphic imaged by a user based on plural points specified by the user. SOLUTION: Constraint conditions that specified points p1 to p4 are connected in a specified order on the curve and that the curvature of the curve is maximum at p2 and p3 , which are not endpoints, are set in a memory. A curve generating device provides a dividing point D1 for dividing an obtaining curve into partial curves C1 (t) and C2 (t) to describe each partial curve by the quadratic polynomial of a parameter (t). Then the coefficient of each polynomial is calculated through the use of the constraint condition by setting p1 and p4 to be endpoints and obtained C1 (t) and C2 (t) are connected to each other at D1 and displayed on the picture of a display device. A displayed curve becomes an approximate curve consisting of a polygonal line connecting these specified points. |
