page-1983-101-timex-sinclair-programming-tricks

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87 Beautiful Braided RugJust goes to show that some of the most attractivecomputer graphics require some of the shortest programs.Program Listing10 FOR X=l TO 20 STEP 220 FOR Y=l TO 20 STEP 230 PRINT AT X,Y;CHR$ 840 PRINT AT X+l,Y+l;CHR$ 12850 NEXT Y60 NEXT X88 Circling DotMore round graphics on your rectangular picturetube.Program Listing10 CLS20 FOR N=l TO 1230 LET X=20-(10*COS(N/6*PI))40 LET Y=l0+(10*SIN(N/6*PI))50 PLOT X,Y60 NEXT N70 GOTO 2089 Making Things MoveMovement on the computer display screen is an illusion.As in any television picture, the turning on and turningoff of dots in a pattern across a screen can seem toprovide motion to an object drawn on the face of the tube.108
There are a number of ways to get the look of motion.Let's send a dot across the screen:Program Listing10 FOR X=jJ TO 6320 PLOT X,20+SIN X30 UNPLOT X-l,20+SIN(X-l)40 NEXT X50 FOR X=62 TO jJ STEP -160 PLOT X,20+SIN X70 UNPLOT X+l,20+SIN(X+l)80 NEXT X90 GOTO 1090 Window TwinklersWell, what would you call them?Program Listing10 CLS20 RAND100 LET X=INT(63*RND)110 LET Y=INT(43*RND)120 PLOT X,Y130 GOTO 10091 Eyeball ScramblerBlink. Blink. Blink. It's enough to make your eyeballshurt!The screen is filled with all the many printablekeyboard characters. Some flash on and off. Some do not.Creates a very lively display!109
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IMEX/ SJ,NCLAIRODO zx-B'IRDGRAMMING
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FIRST EDITIONFIRST PRINTING©1983 b
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TipTable of ContentsPageIntroductio
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Gee Whiz37 Gee Whiz I: Smart Adder
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97 Draw A Line98 Box Message99 Boxe
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The 101 programs in this handbook c
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author's training in writing BASIC-
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Fun & Games
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Program Listing10 RAND100 LET A=INT
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140 IF R
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130 PRINT •BACKWARD:•140 FOR J=
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110 PRINT •PRESS ANY KEY TO PLAY
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12 60-Second TimerA one-minute time
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210 IF A$=•• THEN GOTO 200220 I
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convert those raw numbers to a batt
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The program here has a temporary su
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1 Create a QuizOne of the most fasc
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line 10 for a.word. It is looking f
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program if you. don't get it right
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90 PRINT100 PRINT "ADDRESS";TAB lO;
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160 LET D$(7)=•sEE YOUR ANALYST"1
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32 Sentence WriterPractice your Eng
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160 IF GH THEN LET H=G180 GOTO 2020
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30 PRINT A$;40 GOTO 1036 Question &
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Gee Whiz
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38 Gee Whiz II:Three-Digit MysteryH
Page 60 and 61: 41 Gee Whiz V: SecondAlphabet Spott
Page 63: Number Crunching
Page 66 and 67: 120 LET R::R+l125 LET W=j130 LET Z=
Page 68 and 69: 10 the computer asks for a number.
Page 70 and 71: Program Listing10 PRINT •WHAT IS
Page 72 and 73: 25 INPUT Z30 IF Z=I THEN GOTO 8035
Page 74 and 75: 70 GOTO 2080 CLS90 PRINT "THE SMALL
Page 76 and 77: 60 CLS70 PRINT "THE FRACTIONAL PORT
Page 78 and 79: 30 INPUT N35 IF N>INT N THEN GOTO 5
Page 80 and 81: Line 20 generates the numbers. Line
Page 82 and 83: Random Numbers:Distr~butionEver won
Page 84 and 85: 110 PRINT "RANDOM NUMBERS TOTAL ";T
Page 87 and 88: Money Matters
Page 89 and 90: Shopper's FriendTake your computer
Page 91 and 92: POST IS BEST BUYPOST UNIT=$0.08KELL
Page 93 and 94: ending in 95 cents. For instance, a
Page 95 and 96: 100 LET D=l-0.0l*P110 LET R=W/D120
Page 97 and 98: 100 IF H>40 THEN GOTO 140110 LET W=
Page 99 and 100: Unit price is total price divided b
Page 101: The computer generates a table of r
Page 105 and 106: 80 Screen FullFill your video scree
Page 107 and 108: gram lines to draw and seem to move
Page 109: Program Listing10 CLS100 FOR L=g TO
Page 113 and 114: 140 NEXT X200 LET X=INT(63*RND}210
Page 115 and 116: Program Listing10 LET A$=• 1120 F
Page 117 and 118: 100 FOR Y=l5 TO 25 STEP 10110 FOR X
Page 119: 101 Random Bar GraphIf you don't ha
Page 123 and 124: Appendix A:Sinclair BASIC WordsHere
Page 125: StatementsCLEARCLSCONTCOPYDIMDIM $F
Page 129 and 130: ooks from ARCsoft PublishersFor the
Page 132: 101 TIMEX 1000/Sinclair ZX-81Progra
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