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

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62 APPLE II COMPUTER GRAPHICS37- 85 FF STA DES TH39- AATAX;BEGIN LDA/STA LOOP3A- Bl FC LOOPTOP LDA (SOURCEL) ,Y3C- 91 FE STA (DESTL) ,Y3E- C8INY3F- D F9 BNE LOOPTOP311- CA DEX312- F 7 BEQ STOP314- E6 FD INC SOURCEH316- E6 FF INC DES TH318- 4C AJMP LOOPTOP31B- 6 STOP RTSEND3Listing 7-8. Assembly language subroutine.In essence, this routine takes $4 bytes of memory from the source rangeand copies it into the Low-Res page 1 area.Wrapping UpBy now yow have probably learned more than you ever wanted to knowabout Low-Res graphics, but do not despair, as many of the same conceptswill apply in Hi-Res graphics as wel l. We have shown you how to controlthe individual units of the Text and Low-Res screens, and how to create,save, and recall pictures on the Graphics screen. Each of the varioustechniques discussed has its peculiar advantages and disadvantages-someare faster than others, some use more memory, some require disks, and soforth. It is up to you, the programmer, to choose the method best suited toyour application.VocabularyBLOADBSAVEEditorEXECHIMEMLo-byte/Hi-bytePLOT
CHAPTER 7-PRESERVING YOUR PICTURES 63Exercises1. Design and plot a picture of a spaceship on the Low-Res screen.2. Save the figure plotted in Exercise 1 using:a. The method of Low-Res scan #2 (Listing 7-2).b. The method of Low-Res scan #3 (Listing 7-3).3. Draw the figure saved in Exercise 2 by:a. Using BLOAD (or Monitor's READ command).b. Writing a BASIC program to input and plot the data generated inExercise 2a.c. EXECing the DATA statements generated in Exercise 2b into aBASIC program.d. Loading the figure into a safe area of memory and using thememory move given in Listing 7-6.
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APPLE IICOMPUTERGRAPHICSKen William
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Contents1 Introduction 12 Computer
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1IntroductionThe level of graphics
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4 APPLE II COMPUTER GRAPHICSmachine
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6 APPLE II COMPUTER GRAPHICScompute
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8 APPLE II COMPUTER GRAPHICSzeros i
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10 APPLE II COMPUTER GRAPHICSthe sy
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Page 24 and 25: 18 APPLE II COMPUTER GRAPHICSThe po
Page 27 and 28: 4APP LESO FTExtensionsObjectivesAft
Page 29 and 30: CHAPTER 4-APPLESOFT EXTENSIONS 23va
Page 31 and 32: CHAPTER 4-APPLESOFT EXTENSIONS 251
Page 35 and 36: Introducing -Diskette to Accompany
Page 39 and 40: 5Graphics Modes andSoft SwitchesObj
Page 41 and 42: CHAPTER 5-CRAPHIC MODES AND SOFT SW
Page 43 and 44: CHAPTER 5-GRAPHIC MODES AND SOFT SW
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Page 52 and 53: 44 APPLE II COMPUTER GRAPHICSEach b
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Page 56 and 57: 48 APPLE II COMPUTER GRAPHICS3 PLOT
Page 58 and 59: 50 APPLE II COMPUTER GRAPHICSType t
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Page 62 and 63: 54 APPLE II COMPUTER GRAPHICScolor.
Page 64 and 65: 56 APPLE II COMPUTER GRAPHICSThis m
Page 66 and 67: 58 APPLE II COMPUTER GRAPHICSmuch l
Page 68 and 69: 60 APPLE II COMPUTER GRAPHICS70 POK
Page 73 and 74: 8Hi-Res GraphicsObjectivesAfter rea
Page 75 and 76: CHAPTER 8-Hl-RES GRAPHICS 67When J
Page 77 and 78: C..: HAPTER 8-Hl-RES GRAPHICS 69Goi
Page 79 and 80: CHAPTER 8-Hl-RES GRAPHICS 71Row Add
Page 81 and 82: CHAPTER 8-Hl-RES GRAPHICS 73The fou
Page 83 and 84: CHAPTER 8-Hl-RES GRAPHICS 75The row
Page 85 and 86: CHAPTER 8-Hl-RES GRAPHICS 77Solutio
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Page 90 and 91: 82 APPLE II COMPUTER GRAPHICSA Bit
Page 92 and 93: 84 -APPLE II COMPUTER GRAPHICSget t
Page 94 and 95: 86 APPLE II COMPUTER GRAPHICSDOTBIT
Page 96 and 97: 88 APPLE II COMPUTER GRAPHICSIn Fig
Page 98 and 99: 90 APPLE II COMPUTER GRAPHICSblue a
Page 100 and 101: 92 APPLE II COMPUTER GRAPHICSHEX HE
Page 102 and 103: 94 APPLE II COMPUTER GRAPHICS50 HGR
Page 104 and 105: 96 APPLE II COMPUTER GRAPHICSone of
Page 107 and 108: 991 111ObjectivesAfter reading Chap
Page 109 and 110: CHAPTER 10-SHAPING UP 101A closed d
Page 111 and 112: CHAPTER 10-SHAPING UP 103In the fir
Page 113 and 114: CHAPTER 10-SHAPING UP 105( (J(J) ha
Page 115 and 116: CHAPTER 10-SHAPING UP 107as the com
Page 117 and 118: 6 POKE 232,: POKE 233 ,37 REM8 REM
Page 119 and 120: CHAPTER 10-SHAPING UP 111Sections A
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CHAPTE R 10-SHAPING UP 113DRAW 2 AT
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CHAPTER 10-SHAPING UP 115printed at
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CHAPTER 10-SHAPING UP 117Exercises1
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120 APPLE II COMPUTER GRAPHICS1 REM
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122 APPLE II COMPUTER GRAPHICSLet's
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124 APPLE II COMPUTER GRAPHICSJ28 :
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126 APPLE II COMPUTER GRAPHICS670 X
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128 APPLE II COMPUTER GRAPHICS71¥l
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130 APPLE II COMPUTER GRAPHICS100 R
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132 APPLE II COMPUTER GRAPHICSAs we
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12Byte-Move ShapesObjectivesAfter r
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CHAPTER 12-BYTE-MOVE SHAPES 13729JJ
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CHAPTER 12-BYTE-MOVE SHAPES 139l!il
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CHAPTER 12-BYTE-MOVE SHAPES 141POKE
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CHAPTER 12-BYTE-MOVE SHAPES 1431BYT
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CHAPTER 12-BYTE-MOVE SHAPES 145Agai
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148 APPLE II COMPUTER GRAPHICSprovi
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150 APPLE II COMPUTER GRAPHICSaroun
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152 APPLE II COMPUTER GRAPHICS3 : 2
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154 APPLE II COMPUTER GRAPHICSdesir
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156 APPLE II COMPUTER GRAPHICSso ma
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158 APPLE II COM PUTER GRAPHICSfigu
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160 APPLE II COMPUTER GRAPHICSHPLOT
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162 APPLE II COMPUTER GRAPHICSset u
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164 APPLE II COMPUTER GRAPHICStoget
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166 APPLE II COMPUTER GRAPHICSThen
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168 APPLE II COMPUTER GRAPHICSyou s
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170 APPLE II COMPUTER GRAPHICS-$960
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172 APPLE II COMPUTER GRAPHICSand i
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174 APPLE II COMPUTER GRAPHICSsome
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176 APPLE II COMPUTER GRAPHICSTable
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ZS$==e
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GlossaryA particular number that co
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GLOSSARY 183HI-RES. High Resolution
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GLOSSARY 185SEPARATION. Any one of
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Editoi:(s)Hi-Res, 66, 100Low- Res,
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