| 摘要 |
PURPOSE:To display an overwritten graphic above and to clearly display the positions of top and bottom by inspecting the velocity of a position to be plotted and erasing nearby display at the time of plotting. CONSTITUTION:When a plotting means 1 plots graphic data, a discrimination means 2 inspects a bit adjacent to a bit to be plotted, discriminates the connected relation of graphic data. An erasing means 3 erases the bit in a direction discriminated to have no connecting relation by the discrimination means 2 among the bits adjacent to the bit to be plotted. Consequently, the bit near an intersection point in the graphic which is previously plotted is erased at the intersection point of the graphic which is previously plotted and the graphic (a-b) which is plotted by overwriting. Thus, the top and bottom relation of the overwritten graphic and the previously plotted graphic on display can be clearly displayed. |
