Listing of file='CIRCLES' on disk='vmedia/2282_graphics_crt_demos.wvd.zip'
# Sector 95, program filename = 'CIRCLES' 0001 REM % CHORDS OF CIRCLE - 12/27/78 - by R.L. Droz 0002 COM R,L,O,P$3 0005 PRINT HEX(0D03),,"CHORDS OF CIRCLE PLOTTING PROGRAM." : PRINT 0006 LINPUT "GRAPHICS CRT IS AT WHICH ADDRESS?" -P$ 0007 MAT SEARCH "0413151617", = STR(P$,2,2) TO L$ : IF STR(L$,,2)=HEX(0000) THEN 5 0008 ON 1+VAL(L$,2)/2 SELECT PLOT C04; PLOT C13; PLOT C15; PLOT C16; PLOT C17 : ELSE GOTO 5 0015 SELECT D 0035 INPUT "RADIUS OF CIRCLE",R 0040 INPUT "NUMBER OF LINES",L 0041 INPUT "DEGREES OF OFFSET",O 0042 INPUT "DELTA",D 0043 PLOT <,,HEX(03E5)> : ERRORGOTO 5 0044 R=R+1 : PLOT <(800-R1)/2,(512-R1)/2,HEX(E4)> 0045 PLOT <,,R>,<R,0,U> : X0=R 0050 FOR I=0 TO 360 : X=ROUND((R*COS(I),0) : Y=ROUND((R*SIN(I),0) 0060 PLOT <X-X0,Y-Y0,D> : X0=X : Y0=Y : NEXT I : R=R-1 0061 PRINT : PRINT "KEY SF'0 TO STOP DISPLAY." 0062 GOSUB 70 0063 KEYIN L$,63,64 : PLOT <,,HEX(E2)> : $BREAK 255 : GOSUB 70 : PLOT <,,HEX(E1)> : O=O+D : GOTO 62 0064 IF STR(L$,,1)<>HEX(00) THEN 62 : PRINT HEX(0C);"KEY SF'31 TO RETURN TO MENU." : END 0070 FOR I=0 TO 360 STEP 360/L : X0=ROUND((R*COS(I),0) : Y0=ROUND((R*SIN(I),0) 0080 X=ROUND((R*COS(I+O),0) : Y=ROUND((R*SIN(I+O),0) 0090 PLOT <,,R>,<X0,Y0,U>,<X-X0,Y-Y0,D> : NEXT I 0095 RETURN 1000 DEFFN'31 : COM CLEAR R : LOAD DC T "!"