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

CHAPTER 8-Hl-RES GRAPHICS 77SolutionThe fi rst task is to digitize the cannon. Notice that it is fourteen dots wideand ten bytes high, so it will require four boxes to display. The figure hasalready been divided into four quadrants. Figures 8-8A-D show the digitizingof the corresponding quadrant.DOT BIT HEX DECPATTERN PATTERN VALUE VALUE---------------------------------------------X-X-X-X 101 0101 $55 85X-X-X-X 101 0101 $55 85X-X-X-X 101 0101 $55 85X-X-X-X 101 0101 $55 85------- 000 0000 $00 0-----X- 010 0000 $20 32----XX- 011 0000 $30 48---XXXX 111 1000 $78 120Figure 8-8A.DOT BIT HEX DECPATTERN PATTERN VALUE VALUE-----------------------------------------------X-X-X- 010 1010 $2A 42-X-X-XX 110 1010 $6A 106-X-X-XX 110 1010 $6A 106-X-X-X- 010 1010 $2A 42--X-X-- 001 0100 $14 . 20X-X-X-- 001 0101 $15 21X-X-XX- 011 0101 $35 53---XXXX 111 1000 $78 120Figure 8-88.DOT BIT HEX DECPATTERN PATTERN VALUE VALUE-------------------------------------------------XXXX----XX-111 1000 $78011 0000 $30Figure 8-8C.12048DOTPATTERNBITPATTERNHEXVALUEDECVALUE--XXXX----XX-$78$3012048Figure 8-80.