| 摘要 |
PURPOSE:To provide a system which is improved in fractionizing an area into plural polygons. CONSTITUTION:Fractionization is performed by discriminating a middle point E between points A and B, and the middle point E is easily calculated because its x coordinate is a mean volume of x coordinates of points A and B. In the same manner, the mean value of the y coordinate is obtained. Consequently, a middle point F is placed at the middle point of a vector BC, and a middle point G is placed at the middle point of a vector CD. A point H placed at the middle point of a vector EF and a point I placed at the middle point of a vector FG are discriminated to continue the middle point discriminating process, and a point J is calculated as the middle point of a vector HI. Points E and H are curvature control points of the first curve, and points I and G are those of the second curve, and the point J is a new end control point of these two Bezier curves. First approximation by means of straight lines AB, BC and CD is improved by generating straight lines AE, EH, HJ, JI, IG, and GD. |
