| 摘要 |
PROBLEM TO BE SOLVED: To provide a printer in which a plotting instruction can be processed at high rate by saving the plotting of a figure into a memory under predetermined conditions thereby decreasing the number of read/write times of a memory in the graphic process. SOLUTION: Judgeable is represented by a density Ld=0 and a judgeable flag M=0 (S2), and plotting instructions As, Ls and F are inputted for each figure (S3). If M≠1 (S4; N) and a plotting instruction logical operation F is not SET (S5; N), a decision is made that logical operation results are indeterminate and 1 is substitute for M (S9) before the control advances to plotting instruction processing (S10). If a density Ls specified by a plotting instruction is identical to a density Ld written in Ad (S6; Y), logical operation SET (F (S, D)=S) is identical to D and an operation for reading the memory in As over the entire region, performing logical operation SET and writing in the memory in Ad can be saved. |
