1 REM ** Ever-Changing Mandala **
2 ' BASED ON: GW-BASIC Made Easy, Chapter 12. File: GWME1211.BAS
100 REM ** Setup **
'✏ 110 was SCREEN 1: COLOR 0, 1: CLS : KEY OFF
110 SCREEN _newimage(640,200,9)
120 RANDOMIZE TIMER: DEFINT A-Z
130 REM ** Draw mandala until ESC key is pressed **
'🆕
_alert("Press the escape key to pause the program.\n\nWhen the program is paused, press the escape key again to end the program, or press any other key to resume the program.")
'✏ 140 was CIRCLE (160, 100), 2, 3: PAINT (160, 100), 3, 3 'Center
140 CIRCLE (320, 100), 2, 3: PAINT (320, 100), 3, 3 'Center
150 WHILE INKEY$ <> CHR$(27)
160 ' Assign random values to variables
170 radius = INT(8 * RND) + 3
'✏ 180 OneKolor = INT(3 * RND) + 1: TwoKolor = INT(4 * RND)
180 OneKolor = INT(15 * RND) + 1
'🆕
if int(3*rnd) <> 0 then
  TwoKolor = INT(16 * RND)
else
  TwoKolor = 0
end if
'✏ 190 had INT(155 
190 DelH = INT(310 * RND) + 10 'Horizontal offset
200 DelV = INT(95 * RND) + 10 'Vertical offset
210 ' Draw and paint circles
'✏ lines 220-290: x values all doubled
220 CIRCLE (320 + DelH, 100 + DelV), radius, OneKolor
230 PAINT (320 + DelH, 100 + DelV), TwoKolor, OneKolor
240 CIRCLE (318 - DelH, 100 + DelV), radius, OneKolor
250 PAINT (318 - DelH, 100 + DelV), TwoKolor, OneKolor
260 CIRCLE (318 - DelH, 99 - DelV), radius, OneKolor
270 PAINT (318 - DelH, 99 - DelV), TwoKolor, OneKolor
280 CIRCLE (320 + DelH, 99 - DelV), radius, OneKolor
290 PAINT (320 + DelH, 99 - DelV), TwoKolor, OneKolor

'✏ Easing the CPU workload
' The original GW-BASIC code to delay drawing to the screen (CPU intensive)
' I've replaced lines 300 and 310 with the SLEEP statement, which seems to be much less CPU intensive (well, on my quad-core Chromebook)
' 300 delay! = 1 : start! = TIMER
' 310 WHILE TIMER < start! + delay!: WEND 'Pause
SLEEP 0.25

320 WEND
330 REM ** Check to see if more or quit **
340 ky$ = INPUT$(1): IF ky$ <> CHR$(27) THEN 150 'More or quit
'✏350 CLS: SCREEN 0: WIDTH 80: END
350 END