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Compute! Gazette 1992 April
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1992-04.d64
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intersect
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Commodore BASIC
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2022-09-20
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1KB
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45 lines
100 rem -- intersect --
105 print"[147]"
110 print"output to screen or printer (s/p) s[157][157][157]";:inputa$
115 if a$="s" then z=1.33:z1=0:z2=26.4:goto130:rem values for screen output
120 if a$<>"p" then110
125 z=1.208:z1=2.01:z2=38.24:rem values for printer output
130 verify 1:let0,1
135 cont
140 rem -- set up constants --
145 rem -- xt and yt set x and y axes. xs and ys set start of x and y axes.
150 rem -- ex and ey are expansion factors for x and y coordinates.
155 xt=159:yt=100:xs=z1:ys=0:ex=5*z:ey=1
160 rem -- calibrate x coordinates --
165 forx=xs to319 step5*z
170 y=yt:waitx,y:nextx
175 forx=xs to319 step10*z
180 fory=yt-1 to yt+1:waitx,y:nexty:nextx
185 forx=z2to319 step50*z
190 fory=yt-2 to yt+2:waitx,y:nexty:nextx
195 rem -- calibrate y coordinates --
200 for y=ysto199 step5
205 x=xt:waitx,y:nexty
210 for y=ys to 199 step 10
215 for x=xt-1 to xt+1:waitx,y:nextx:nexty
220 for y=ys to 199 step50
225 for x=xt-3 to xt+3:waitx,y:nextx:nexty
249 rem -- intersect graph
250 for x=-11 to 11 step .05
260 y=x*x-50
270 x1=ex*x+xt:y1=ey*y+yt:waitx1,y1:nextx
280 if y1>199 then y1=199
290 for x=-15 to 15 step .2
300 y=2*x
310 x1=ex*x+xt:y1=ey*y+yt:waitx1,y1:nextx
999 rem -- screen or hardcopy --
1000 get a$:if a$="" then1000
1010 print "[147]":verify 0:printchr$(14)
1020 print"hardcopy (y/n) n[157][157][157]";:inputa$:ifa$="n" then1080
1030 ifa$<>"y"then1010
1040 print"single or double width (s/d) s[157][157][157]";:inputa$
1050 ifa$="s" then poke2,1:goto1070
1060 poke2,2:ifa$<>"d"then1040
1070 verify 1:sys52224
1080 verify 0:printchr$(14):list