| 摘要 |
PROBLEM TO BE SOLVED: To secure a storage area of optimum size according to the number of coordinate data without placing any load on a system and to shorten a processing time. SOLUTION: A precount part 4 prereads the number of edge data of each scanning line and the maximum and minimum values of y coordinates of a bounding box as characteristics of an object figure to be drawn when the number of vectors decided by a vector number decision part 3 is larger than a threshold. An edge list area securing method selection part 7 selects a dynamic area securing part which is suitable for dynamically securing a necessary irreducible new edge list area out of dynamic area securing parts 8a, 8b, 8c, etc., having different algorithm according to the characteristics of the object figure to be drawn. An edge list area switching part 6 switches which of a drawing coordinate storage part L1 and a drawing coordinate storage part L2 the edge data converted by the drawing part 2 are stored by using the selected dynamic area securing part. |
