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GRAPH12.BAS
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BASIC Source File
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1989-04-23
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1KB
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33 lines
0 dim y(64),z(64):key off:screen 2
40 cls:locate 10,30:input "Line density (MAX=8)";ld$:ld=val(ld$):if ld=0 then ld=5
55 locate 12,33:input "Dot density";dd$:dd=val(DD$):if dd=0 then dd=32
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 5*dd
115 max=-200:min=200:x1=int(25*(-5+i/dd)+.5):x2=-4+i/dd
120 if i<=2*dd then nl=int(i/dd*4*ld) else nl=8*ld
125 for j=0 to nl
130 x=x2-j/4/ld:y=-4+j/ld
135 gosub 1000:y(j)=y:z(j)=z
140 gosub 2000:next j
145 max=-200:min=200:x1=-x1
150 for j=nl to 0 step -1
155 y=-y(j):z=z(j)
160 gosub 2000:next j,i
175 sound 1000,2: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$="r" then 40 else if a$<>"E" and a$<>"e" then 195
200 end
1000 r=sqr(x*x+y*y)
1010 z=cos(4*r)/(r/2+2)-3*r/8+1
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)
2050 if y>max then max=y else return
2070 pset(320+x1,100-y)
2090 return