williams-et-al-1983-apple-ii-computer-graphics

96 APPLE II COMPUTER GRAPHICSone of the facts of Hi-Res life, and it is virtually impossible to avoid completely,though carefu l planning of your figures will help you to minimizeit.Wrapping It UpBy their very nature, the topics discussed in this chapter are perhaps themost confusing in the book. The color bit controls the colors available tothe rest of the byte, and the color of an individual dot is determined bywhether it is in an odd or even column of the screen, and by the setting ofthe color bit. To display a given color, you must fi rst determine whether itis in color group 1 or 2, and then whether it is available on an even dot oran odd dot. There is no way to display two diffe rent color groups in thesame byte at all, and no way to display two colored dots next to eachother without both dots turning to white.We have seen that, despite what the manuals say, there are 56