| 摘要 |
PURPOSE:To hasten the drawing speed of a straight line whose inclination to a horizontal line is <=45 deg. by constituting so that once memory accessing in the same word is sufficient. CONSTITUTION:A drawing signal generating part 5 inputs a drawing scope signal and a signal AD of an address number from an address register 3, and the signal AD of the address number and a word drawing signal WB of the address number are outputted to the bit serial by an address changing signal CA. To respective memory elements of the word of the prescribed address number of a displaying memory part 6, the drawing signal is simultaneously written. Hereinafter in the same way, by repeating the action until it arrives at a drawing completing point B, the bit pattern of one straight line is written into the displaying memory part 6. Thus, once memory accessing in the same word is sufficient, the number of times of memory accessing can be decreased and the drawing speed can be hastened. |
