| 摘要 |
PURPOSE:To wholly reduce the number of graphic vectors and to improve processing efficiency while keeping the smoothness of a plotted graphic by making the degree of dividing variable corresponding to the diameter of a circle or a circular arc, broken-line-approximating the circle or the circular arc and graphic plotting. CONSTITUTION:A separating degree table 6 to store the information of the degree of dividing of a circle or a circular arc is possessed. Then, the information of the degree of dividing corresponding to the diameter of the circle or the circular arc to be plotted is found by the referring of the separating degree table 6, the circle or the circular arc is divideconverted into plural line segments according to the information of the degree of dividing by a vector converting part 5, the respective line segments are approximated to straight lines respectively, and graphic is plotted. Consequently, the circle or the circular arc can be approximated to straight lines at the proper number of dividings and can be plotted smoothly and beautifully, and moreover, the number of graphic vectors decided by the number of dividings can be reduced wholly. |
