| 摘要 |
PURPOSE:To improve the operability and the response of a device by making the number of buffers to store temporarily the information of the generation, deletion, etc., of a graphic by a graphic processing command execution before the graphic data file is renewed, into plural and using the buffers alternately. CONSTITUTION:An empty buffer pointer 14 points out an empty buffer out of buffers 17 and 18. A canceling display renewing part 19 is one of the routines of a graphic processing program, refers to the renewing information and the graphic data file stored at the buffers 17 and 18 and returns the display of a graphic display device 13 to the condition before the previous command execu tion. A data file renewing part 20 renews a graphic data file 21 based upon the renewing information stored at the buffers 17 and 18 by the routine of a graphic processing program. A graphic data file 21 accumulates the generated graphic data.
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