49 lines
1.2 KiB
QBasic
49 lines
1.2 KiB
QBasic
' cls()
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10 GR
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' ::_::
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'for i=0,1600 do
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20 FOR I=0 TO 400
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'if(i<15)pal(i,({0,128,130,2,136,8,142,137,9,10,135,7})[i+1],1)
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30 REM
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'x=rnd(128)
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40 X=RND(1)*40
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'y=rnd(128)
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50 Y=RND(1)*40
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'a=atan2(x-20,y-20)+.17
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'60 A=ATN(X-20,Y-20)+.17
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60 IF X-20=0 AND Y-20=0 THEN GOTO 40
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' X>0 case, plain ATN, Quadrants I and IV
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64 IF X-20>0 THEN A=ATN((Y-20)/(X-20)):GOTO 68
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' X=0 then pi/2 or -pi/2 depending on Y
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65 IF X-20=0 THEN A=1.57*SGN(Y-20):GOTO 68
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' X<0 and Y>=0, Quadrant II
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67 IF Y-20>=0 THEN A=ATN((Y-20)/(X-20))+3.14:GOTO 68
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' X<0 and Y<0 Quadrant III
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67 A=ATN((Y-20)/(X-20))-3.14
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68 A=A+1
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'd=rnd(7)
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70 D=RND(1)*7
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'pset(x+cos(a)*d,y+sin(a)*d/3-cos(a)*d/4,max(0,pget(x,y)+.87-rnd()))
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80 C=SCRN(X,Y)+0.87-RND(1)
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81 IF C<0 THEN C=0
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82 COLOR=C
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85 XX=(X+COS(A)*D/4)
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87 YY=(Y+SIN(A)*D/12-COS(A)*D/16)
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'87 YY=(Y+SIN(A)*D/3-COS(A)*D/4)
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88 IF XX<0 OR XX>39 GOTO 100
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89 IF YY<0 OR YY>39 GOTO 100
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90 PLOT XX,YY
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'92 IF INT(C)=0 GOTO 100
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'95 PRINT INT(X);" ";INT(Y);" ";INT(XX);" ";INT(YY);" A=";INT(A);" C=";INT(C)
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'97 GET A$
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'end
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100 NEXT I
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' circfill(64,64,5,11)
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110 COLOR=15
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115 PLOT 20,20:PLOT 19,20:PLOT 21,20
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117 PLOT 19,19:PLOT 20,19:PLOT 21,19
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119 PLOT 19,21:PLOT 20,21:PLOT 21,21
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'120 INPUT A$
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130 GOTO 20
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'flip()goto _
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