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18 lines
650 B
QBasic
18 lines
650 B
QBasic
5 GR
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10 FOR Y=0 TO 16:COLOR=Y+1:HLIN12,28AT(Y*2)+4:HLIN12,28AT(Y*2)+5:NEXT
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15 INPUT R
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20 A=(R*3.14159265)/180:T=TAN(A/2):S=SIN(A)
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30 GOSUB 1000
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130 FOR X=0 TO 39:O=(X-20)*S:IF O<0 GOTO 160
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150 FOR Y=0 TO 47:C=0:IF ((Y+O)>0) AND ((Y+O)<47) THEN C=SCRN(X,Y+O)
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155 GOTO 170
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160 FOR Y=47 TO 0 STEP -1:C=0:IF ((Y+O)>0) AND ((Y+O)<47) THEN C=SCRN(X,Y+O)
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170 COLOR=C:PLOT X,Y:NEXT Y,X
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200 GOSUB 1000
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300 END
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1000 FOR Y=0 TO 47:O=-(Y-24)*T:IF O<0 GOTO 1030
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1010 FOR X=0 TO 39:C=0:IF ((X+O)>0) AND ((X+O)<39) THEN C=SCRN(X+O,Y)
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1020 GOTO 1040
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1030 FOR X=39 TO 0 STEP -1:C=0:IF ((X+O)>0) AND ((X+O)<39) THEN C=SCRN(X+O,Y)
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1040 COLOR=C:PLOT X,Y:NEXT X,Y:RETURN
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