| 摘要 |
PURPOSE:To attain the painting-out of a closed graphic of which an internal point is not clear by making the whole memory area bit-inversed, extracting a closed graphic internal part after painting out the whole outside of the closed graphic within the memory area, taking the AND of the extracted area and an arbitrary bit pattern and plotting the visible outline of the closed graphic in the arbitrary pattern again. CONSTITUTION:A plotting processor 22 executes the painting-out of a simple graphic with using the boundary point searching function of an AGDC (Advanced Graphics Display Controller) and the painting-out function of a closed area under the control of a CPU 21. The boundary searching by the AGDC of the plotting processor 22 is executed from the boundary of a memory area, the outside of the closed graphic is painted out and the whole bits are set up. Next, the whole memory area is inversed and the inner side of the closed graphic is painted out. Thus, the painting-out of the arbitrary simple closed graphic is attained with using the conventional LSI function. |
