mirror of
https://github.com/inexorabletash/jsbasic.git
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46 lines
2.2 KiB
Plaintext
46 lines
2.2 KiB
Plaintext
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10 TEXT : HOME : REM Clear the screen
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20 VTAB 4 : HTAB 14 : PRINT "LoRes Drawing"
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30 VTAB 10 : HTAB 7 : PRINT "By Gregg Buntin - Dec 2, 2016"
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40 VTAB 12 : HTAB 2 : PRINT "Adapted from ancient code (circa 1985)"
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50 VTAB 19 : PRINT "Do you want instructions?"
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60 GET ANS$ : REM read input
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70 IF ANS$ = "Y" OR ANS$ = "y" THEN 500
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200 X = 1:Y = 1:C = 2 : REM Set x,y and color defaults
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210 TEXT : HOME : GR : REM Clear screen and set graphics mode
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220 MESS$ = "Not Plotting" : GOSUB 800
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230 GOTO 400 : REM Jump to plot current dot then continue
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240 K = PEEK ( - 16384): IF K < 128 THEN 240 : REM Read Keyboard
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250 X1 = X:Y1 = Y: POKE - 16368,0 : REM Save last position
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260 IF K = 155 THEN TEXT : HOME : END : REM Esc
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270 IF K = 136 THEN X = X - 1: IF X < 0 THEN X = 39 : REM Left
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280 IF K = 149 THEN X = X + 1: IF X > 39 THEN X = 0 : REM Right
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290 IF K = 139 THEN Y = Y - 1: IF Y < 0 THEN Y = 39 : REM Up
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300 IF K = 138 THEN Y = Y + 1: IF Y > 39 THEN Y = 0 : REM Down
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310 IF K = 195 THEN VTAB 24: INPUT "COLOR:";C: COLOR= C : HOME : REM Color
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320 IF K = 208 THEN PL = 1 : MESS$ = "Plotting" : REM P (Plot)
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330 IF K = 206 THEN PL = 0 : MESS$ = "Not Plotting" :REM N (No Plot)
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340 IF K = 197 THEN PL = 2 : MESS$ = "Erasing" : REM E (Erase)
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350 IF K = 210 THEN GOSUB 700 : REM R (Reset / Clear)
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360 GOSUB 800
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370 IF PL = 0 THEN COLOR= OC: PLOT X1,Y1 : REM Plot the current position non destuctively
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380 IF PL = 2 THEN COLOR= 0: PLOT X1,Y1 : REM Erase the current positon
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390 OC = SCRN( X,Y) : REM Save current position Color
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400 COLOR= C: PLOT X,Y : REM Plot the current position
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410 GOTO 240 : REM go read another key
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500 TEXT : HOME
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510 PRINT "Arrow keys move up, down, left, right"
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520 PRINT "C key changes color"
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530 PRINT " (valid values are from 0 to 15)"
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540 PRINT "P plot dots (draw)"
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550 PRINT "N No plot dots (don't draw)"
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560 PRINT "E Erase dots"
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570 PRINT "R Reset (clear screen)"
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580 PRINT "Esc Quits"
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590 PRINT : PRINT "Press any key to continue"
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600 GET ANS$
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610 GOTO 200
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700 VTAB 23 : HTAB 1 : PRINT "Really clear screen?"; : GET ANS$ : IF ANS$ = "Y" OR ANS$ = "y" THEN TEXT : HOME : GR
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710 RETURN
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800 HOME : VTAB 23 : HTAB 1 : PRINT MESS$ : RETURN
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