| 摘要 |
PURPOSE:To reduce the burden of software and to plot a graphic at a high speed by registering the bit pattern of a paint out circle and copying it as it is at the time of plotting. CONSTITUTION:When there is the paint out circle, a central processing unit 1 judges whether the diameter is less than that of a reference circle or not. When the diameter is less than that of the reference circle, it is judged whether the circle in the size is registered or not in a pattern memory 4 to which the bit pattern is previously registered. When it is registered, an instruction is given the a paint out control part 2 and a display memory 3 is caused to execute plotting. When it is not registered, it is additionally registered in the pattern memory 4 if there is a space, and plotting is executed by using the paint out control part 2. When there is no space, the pattern which is recently least used is turned out, and the pattern is newly registered in the place. Then, circle is plotted by using the paint out control part 2. When the diameter of the circle is more than that of the reference circle, the circle is directly plotted from the central processing part 1 into the display memory 3. The circle plotted into the memory 2 is displayed in CRT 5. |
