| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of operation times on a scan line coordinate and a memory area storing the scan line coordinate by setting the scan line coordinate to be that in a selected axial direction when the axis direction is selected and inputted, and plotting a scan line with inputted address update quantity as the address update quantity in the selected axial direction. SOLUTION: When an xy-axes direction selection means 13 selects an x- direction, for example, a scan line coordinates calculation means 14 calculates x-axis direction scan line coordinates with a prescribed format. An x-axis direction address update quantity calculation means 16 calculates the address update quantity of the x-axis direction. A scan line plotting means 18 sets the scan line coordinate inputted from the scan line coordinate calculation means 14 to be the scan line coordinate in the x-axis direction and plots a scan line on a plotting memory 19 with the address update quantity inputted from the x-axis direction address update quantity calculation means 16 as the address update quantity of the x-axis direction. |
