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GRAPH10.BAS
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BASIC Source File
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1989-04-23
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1KB
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40 lines
0 dim y(16),z(16):key off:screen 2
55 cls:locate 12,33:input "Dot density";dd$:dd=val(DD$):if dd=0 then dd=32
56 dd=dd/2:dx=1/4/dd
65 locate 14,30:print"Seclect Viewing Angle":print tab(30)" 0 degrees is from overheard":print tab(30)" 90 degrees is from the side"
66 locate 18,30:input "Angle in degrees";a$:a=val(a$):if a=0 then a=70
90 a=a*3.14159/180:s=sin(a):c=cos(a):cls
110 for i=0 to 7:for k=0 to 1:for j=0 to dd-1
115 max=-200:min=200:x=-4+i/2+k/4+j*dx:x1=int(30*x+.5):cc=16
116 for l=0 to 7:for n=1 to 2
118 if k=0 then f=(-1)^n*(dd-j)*dx else f=(-1)^n*j*dx
120 y=-3.75+l/2+f:gosub 1000
122 if y<-sqr(16-x*x) then 135
128 y(cc)=y:z(cc)=z:cc=cc-1
130 gosub 2000
135 next n,l
140 gosub 3000:next j,k,i
145 x1=0:min=200:max=-200
150 for i=-4 to 4 step .5:y=i:gosub 1000:gosub 2000:next i
175 sound 1000,2
180 t=timer:while t+1.5>timer:wend
185 if inkey$="" then 175
190 locate 25,1:print"Press <R>epeat or <E>xit";
195 a$=inkey$:if a$="R" or A$="r" then 55 else if a$<>"E" and a$<>"e" then 195
200 end
1000 r=sqr(x*x+y*y)
1010 z=1.5*(cos(r)-cos(3*r)/3)+.5
1020 return
2000 y=int(30*(c*y+s*z)+.5)
2005 if m=4 then 2050
2010 if y<min then min=y else 2050
2030 pset(320+x1,100-y)
2040 pset(320-x1,100-y)
2050 if y>max then max=y else return
2070 pset(320+x1,100-y)
2080 pset(320-x1,100-y)
2090 return
3000 for ii=cc+1 to 16:z=z(ii):y=-y(ii):gosub 2000:next ii:return