Raster operation codes define how GDI combines colors in output operations that involve a currentbrush, a possible source bitmap, and a destination bitmap.
光栅操作模式说明了GDI是如何组合输出操作中的颜色，包括当前画刷、可能的源位图和目标位图。
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Filled areas Whenever a series of lines or curves encloses an area, you can cause that area to be filled with the current GDI brush object.
Secondly, fuzzy theory and fuzzy control is introduced generally. Then, the computer control system of electrolytic cleaning line and brush roll motor current load fuzzy control system are designed.