mirror of
https://github.com/inexorabletash/jsbasic.git
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50 lines
1.7 KiB
Plaintext
50 lines
1.7 KiB
Plaintext
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10 rem Converge on a value demo
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15 rem Testing a routine that will smoothly converge on a value, easing into a stop
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20 rem by Golden Child
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100 hgr
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110 c=0:d=100 :gosub 5000 : ct=0
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120 co=3:x1=c:y1=0:x2=cl:y2=50:gosub 5100:x1=c2:y1=100:gosub 5100:gosub 5500 :c2=cl::c2=cl:cl=c:gosub 9000
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125 if abs(c-d)<.1 then ? "DIST="di" FRAMES="ct:d=rnd(1)*279 : ct=0 : di=d-c:?d,c,di
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130 ct=ct+1:goto 120
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9000 rem converge c=cur value, d=desired value, mr=max rate, md=max dist, ch=change, cd=dist to go
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9010 mr=10:md=100
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9020 cd=d-c
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9030 if cd>md then cd=md
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9040 if abs(cd)<0.1 then c=d
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9045 ch = cd/md*mr
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9050 c=c+ch: rem ?"c="c" d="d" ch="ch" ct="ct
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9051 if abs(ch)<0.1 then c=d
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9060 return
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5000 rem init display list : rem SC = screen to draw
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5001 dim dl(2,100,5):hgr2:hgr
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5002 SC=0 : DL(0,0,0)=0 : DL(1,0,0)=0 :gosub 5500: rem DL(X,0,0) = NUM OF POINTS
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5003 return
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5100 rem draw line on other screen
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5110 poke 230,(SC+1) * 32 : rem forgot the +1 part
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5111 if not(x1>=0 and x1 <=279 and x2 >=0 and x2<=279 and y1>=0 and y1 <=159 and y2>=0 and y2<=159) then return
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5120 rem bug should be DL SP = DL(SC,0,0) + 1 : SL(SC,0,0)=SP : ? sp
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5120 SP = DL(SC,0,0) + 1 : DL(SC,0,0)=SP : rem ? sp
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5130 DL(SC,SP,0)=CO
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5131 DL(SC,SP,1)=X1
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5132 DL(SC,SP,2)=Y1
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5133 DL(SC,SP,3)=X2
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5134 DL(SC,SP,4)=Y2
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5140 HCOLOR=CO : HPLOT X1,Y1 TO X2,Y2
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5190 RETURN
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5400 rem erase lines
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5410 for SP = 1 TO DL(SC,0,0) : HCOLOR=0 : rem ? "erase" sc ,sp
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5411 HPLOT DL(SC,SP,1),DL(SC,SP,2) TO DL(SC,SP,3),DL(SC,SP,4) : NEXT
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5412 DL(SC,0,0)=0 : rem clear the list after erasing
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5420 RETURN
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5500 rem swap screens
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5510 SC = NOT SC
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5511 POKE 49236+(NOT SC),0 : rem select page that we're drawing to
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5514 rem ? "SC="sc
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5515 poke 230,32*(sc+1):gosub 5400 : rem forgot to switch the drawing page
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5520 RETURN
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