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39 lines
1.7 KiB
Plaintext
39 lines
1.7 KiB
Plaintext
60 Y = 5: REM SET STARTING POSITION OF UP-AND-DOWN VARIABLE
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240 REM SET S TO ADDRESS OF SPEAKER
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260 S = - 16336
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280 REM SET TEXT MODE
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300 TEXT : HOME
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310 PRINT "TO SELECT A COLOR FOR"
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320 PRINT "THE BOUNCING BALL, FIRST TYPE"
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330 PRINT "IN ANY NUMBER FROM 1 TO 15."
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340 PRINT "THEN PRESS THE KEY LABELLED RETURN.": PRINT
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350 INPUT "WHAT COLOR WOULD YOU LIKE THE BALL TO BE (1-15)?";HUE$
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352 REM IS ENTRY A NUMBER?
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354 HUE = VAL (HUE$): REM VALUE OF HUE$ BECOMES NUMERIC VARIABLE
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356 IF HUE > 999999 OR HUE < .01 THEN GOTO 300: REM INPUT MESSAGE WILL REAPPEAR
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358 HUE$ = STR$ (HUE): REM HUE CHANGED BACK INTO STRING HUE$
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370 REM IS HUE OF BALL IN RANGE?
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380 IF HUE > 0 AND HUE < 16 THEN 400
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390 HOME : PRINT "THAT WASN'T BETWEEN 1 AND 15!": PRINT
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395 GOTO 310
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400 GR : REM SET COLOR GRAPHICS AREA
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420 HOME : REM CLEAR TEXT AREA
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440 X = 0: REM SET STARTING POSITION OF BACK-AND-FORTH VARIABLE
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460 Y = 5: REM SET STARTING POSITION OF UP-AND-DOWN VARIABLE
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480 XV = 2: REM SET X VELOCITY
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500 YV = 1: REM SET Y VELOCITY
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520 REM CALCULATE NEW POSITION
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540 NX = X + XV:NY = Y + YV
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560 REM IF BALL EXCEEDS SCREEN EDGE, THEN BOUNCE
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580 IF NX > 39 THEN NX = 39:XV = - XV: FOR B = 1 TO 5:BOUNCE = PEEK (S) + PEEK (S) + PEEK (S): NEXT B
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600 IF NX < 0 THEN NX = 0:XV = - XV: FOR B = 1 TO 5:BOUNCE = PEEK (S) + PEEK (S) + PEEK (S): NEXT B
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620 IF NY > 39 THEN NY = 39:YV = - YV: FOR B = 1 TO 5:BOUNCE = PEEK ( S) + PEEK (S) + PEEK (S): NEXT B
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640 IF NY < 0 THEN NY = 0:YV = - YV: FOR B = 1 TO 5:BOUNCE = PEEK (S) + PEEK (S) + PEEK (S): NEXT B
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660 REM PLOT NEW POSITION
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680 COLOR= HUE: PLOT NX,NY
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700 REM ERASE OLD POSITION
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720 COLOR= 0: PLOT X,Y
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740 REM SAVE CURRENT POSITION
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760 X = NX:Y = NY
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780 GOTO 540
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