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SPIDER.GFA
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.txt
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GFA-BASIC Atari
|
1990-01-01
|
896b
|
40 lines
FOR a#=0 TO 15
VSETCOLOR a#,a#,a#,a#
NEXT a#
zoom#=100
poczx#=-200
poczy#=-100
konx#=poczx#+320
kony#=poczy#+200
OUT 4,&H12
FOR y#=poczy# TO kony#
FOR x#=poczx# TO konx#
rc#=x#/zoom#
ic#=y#/zoom#
rz#=rc#
iz#=ic#
exit#=FALSE
k#=16
FOR u#=1 TO 16
kwadrat(rz#,iz#,rz#,iz#)
rz#=rz#+rc#
iz#=iz#+ic#
rc#=rc#/2+rz#
ic#=ic#/2+iz#
IF SQR((rz#^2)+(iz#^2))>6
exit#=TRUE
k#=u#
ENDIF
EXIT IF exit#=TRUE
NEXT u#
COLOR k#-1
PLOT x#-poczx#,y#-poczy#
NEXT x#
NEXT y#
~INP(2)
EDIT
PROCEDURE kwadrat(a#,b#,VAR c#,d#)
c#=a#^2-b#^2
d#=2*a#*b#
RETURN