| 摘要 |
PROBLEM TO BE SOLVED: To attain batch shading plotting for a rectangular area. SOLUTION: At the time of receiving the coordinate values and color information of the upper left corner and lower right corner of a rectangular area from a computer part 1, a delta value calculating part 2 calculates an X direction delta valueΔx and a Y direction delta valueΔy indicating the variation of the color information between picture elements based upon the received data. A memory control part 3 stores the valuesΔx,Δy in a delta value storing part 5 and outputs the color information of the upper left corner to an addition part 7 through a signal line 408. An X direction integration part 6 outputs results obtained by multiplying the valueΔx by respectively different integers to the addition part 7 and a Y direction integration part 12 outputs results obtained by multiplying the valueΔy by respectively different integers to the addition part 7 through a selector 13. While suitably switching the valueΔy selected by the selector 13 in each line and suitably selecting an output from the addition part 7 through a selector 14, the memory control part 3 writes shaded color information in respective corresponding columns from the line including the upper left corner of the rectangular area to be shaded in a memory element 8 up to the line including the lower right corner.
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