94 lines
2.4 KiB
QBasic
94 lines
2.4 KiB
QBasic
' cls()
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10 HGR
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' ::_::
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'for i=0,1600 do
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20 FOR I=0 TO 1600
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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)*128
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'y=rnd(128)
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50 Y=RND(1)*128
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'a=atan2(x-64,y-64)+.17
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'60 A=ATN(X-20,Y-20)+.17
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'60 IF Y-64>0 THEN A=ATN((X-64)/(Y-64)):GOTO 68
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'61 IF Y-64=0 THEN A=1.57*SGN(X-64):GOTO 68
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'62 A=ATN((X-64)/(Y-64))+3.14*SGN(X-64)
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' PICO-8 uses TURNS instead of RADIANS so this is equivelant to roughly 1 radian
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'68 A=A+1
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60 IF X-64=0 AND Y-64=0 THEN GOTO 40
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' X>0 case, plain ATN, Quadrants I and IV
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64 IF X-64>0 THEN A=ATN((Y-64)/(X-64)):GOTO 68
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' X=0 then pi/2 or -pi/2 depending on Y
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65 IF X-64=0 THEN A=1.57*SGN(Y-64):GOTO 68
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' X<0 and Y>=0, Quadrant II
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67 IF Y-64>=0 THEN A=ATN((Y-64)/(X-64))+3.14:GOTO 68
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' X<0 and Y<0 Quadrant III
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67 A=ATN((Y-64)/(X-64))-3.14
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68 A=A+1
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'69 PRINT A
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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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' 1+.87-.99 = .88
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' 1+.87-0.0 = 1.87
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'80 C=SCRN(X/3.3,Y/3.3)+1.37-RND(1)
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80 GOSUB 1100
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81 C=C+0.87-RND(1)
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82 IF C<0 THEN C=0
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83 IF C>7 THEN C=7
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84 HCOLOR=C
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85 XX=(X+COS(A)*D)
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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>240 GOTO 100
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89 IF YY<0 OR YY>192 GOTO 100
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90 HPLOT XX,YY
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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 HCOLOR=7
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115 HPLOT 61,60 TO 69,60:HPLOT 60,61 TO 70,61:HPLOT 60,62 TO 70,62
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117 HPLOT 60,63 TO 70,63:HPLOT 60,64 TO 70,64:HPLOT 60,65 TO 70,65
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119 HPLOT 60,66 TO 70,66:HPLOT 60,67 TO 70,67:HPLOT 61,68 TO 69,68
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'125 INPUT A$
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130 GOTO 20
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'flip()goto _
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1100 REM GET HCOLOR
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1110 REM PARAMETERS: X Y
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1120 REM RETURNS: C
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1130 REM
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1140 HP = 0:HX = X + 1:HY=Y
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1150 ON (HX < 280) GOSUB 1300
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1160 PR = HP:HP = 0:HX = HX - 2
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1170 ON (HX > = 0) GOSUB 1300
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1180 PL = HP:HX = HX + 1: GOSUB 1300
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1190 ODD = HX - INT (HX / 2) * 2
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1200 C = HH * 4
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1210 IF NOT ((PL = PR) AND (PL < > HP)) THEN C = C + HP * 3: RETURN
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1220 IF ODD THEN HP = NOT HP
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1230 C = C + HP + 1
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1240 RETURN
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1250 REM
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1260 REM GET PIXEL
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1270 REM PARAMETERS: HX HY
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1280 REM RETURNS: HH HP
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1290 REM
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1300 HH = INT (HX / 7)
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1310 HV = INT (HY / 8)
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1320 VO = PEEK (37)
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1330 HO = PEEK (36)
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1340 VTAB HV + 1: HTAB 1
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1350 HA = PEEK (41) * 256
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1360 HA = HA + PEEK (40) + HH
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1370 VTAB VO + 1: HTAB HO + 1
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1380 HA = HA + 8192 - 1024
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1390 HP = PEEK (230) / 32
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1400 IF HP = 2 THEN HA = HA + 8192
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1410 HA = HA + (HY - HV * 8) * 1024
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1420 HB = HX - HH * 7
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1430 HV = PEEK (HA)
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1440 HH = INT (HV / 128)
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1450 HV = INT (HV / (2 ^ HB))
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1460 HP = HV - INT (HV / 2) * 2
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1470 RETURN
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