| 摘要 |
PURPOSE:To paint out the inside of a drawn graphic frame at a high speed by using a hardware logic that can recognize a lateral contact of a circle or an apex of a polygon drawn on a graphic memory. CONSTITUTION:When a graphic is drawn to a drawing graphic memory 6 via a graphic control part 1, both X and Y registers 8 and 11 are initialized through a timing control part 2. These initialization values are preset to X and Y coordinate counters 9 and 12 as well as a graphic memory address counter 4 through a switch gate 3. Then 1 0 change detecting counters 21 and 22 count the 1 0 changes for each dot line through the memory 6. The address values of those changing points are stored to FIFO memories 19 and 20 respectively. In such a way, a control circuit of an inter-2-dot paint-out system is obtained to attain the paint-out of a graphic at a high speed with no crossing.
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