| 摘要 |
PURPOSE:To make it possible to perform the shielding of an arbitrary area without correcting graphic data to be plotted. CONSTITUTION:A calculation means 31 calculates the range of the X-coordinate value which is possible to be plotted corresponding to each Y-coordinate of the plotting screen to be obtained from a shielding area for which a plotting is not performed at the inside of the area designated from a plotting processing request system 20. A plotting range storage means 32 preserves the value calculated by this calculating means 31. A plotting means 33 plots the value of the plotting possible range stored in the plotting range storage means 32 and the plotting range in which the plotting range on an X-axis corresponding to each Y-coordinate is determined from a plotting request area. |
