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116 lines
2.4 KiB
Fortran
116 lines
2.4 KiB
Fortran
subroutine pix2d(d2,jz,mousebutton,s2,nchan,nz,b)
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! Compute pixels to represent the 2-d spectrum s2(nchan,nz), and the
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! green line.
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integer*2 d2(jz) !Raw input data
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real s2(nchan,nz) !2-d spectrum
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integer*2 b(60000) !Pixels corresponding to 2-d spectrum
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data nx0/0/
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save
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tbest=s2(2,1)
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s2(1,1)=s2(3,1)
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s2(2,1)=s2(3,1)
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gain=100.
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offset=0.0
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if(mousebutton.eq.0) then
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k=0
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do i=54,7,-1
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do j=1,nz
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k=k+1
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n=0
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if(s2(i,j).gt.0) n=gain*log10(s2(i,j)) + offset
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n=min(252,max(0,n))
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b(k)=n
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enddo
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k=k+500-nz
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enddo
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do i=k+1,60000
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b(i)=0
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enddo
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else
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! This is a mouse-picked decode, so we compute the "zoomed" region.
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k=50*500
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do i=54,7,-1
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do j=1,nz
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k=k+1
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n=0
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if(s2(i,j).gt.0) n=gain*log10(s2(i,j)) + offset
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n=min(252,max(0,n))
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b(k)=n
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enddo
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k=k+500-nz
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enddo
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endif
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if(mousebutton.eq.0) then
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! Compute the green curve
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sum=0.
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do i=1,jz
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sum=sum+d2(i)
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enddo
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nave=nint(sum/jz)
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nadd=661
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ngreen=min(jz/nadd,500)
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k=0
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j=0
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do i=1,ngreen
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sq=0.
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do n=1,nadd
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k=k+1
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d2(k)=d2(k)-nave
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x=d2(k)
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sq=sq + x*x
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enddo
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x=0.0001*sq/nadd
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j=j+1
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x=120.0-40.0*log10(0.01*x)
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if(x.lt.1.0) x=1.0
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if(x.gt.119.) x=119.
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ng=nint(x)
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ng=min(ng,120)
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nx=i
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if(nx.eq.1) ng0=ng
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if(abs(ng-ng0).le.1) then
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b((ng-1)*500+nx)=255
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else
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ist=1
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if(ng.lt.ng0) ist=-1
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jmid=(ng+ng0)/2
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ii=max(1,nx-1)
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do j=ng0+ist,ng,ist
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b((j-1)*500+ii)=255
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if(j.eq.jmid) ii=ii+1
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enddo
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ng0=ng
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endif
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enddo
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! Insert yellow tick marks at frequencies of the FSK441 tones
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do i=2,5
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f=441*i
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ich=58-nint(f/43.066)
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do j=1,5
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b((ich-1)*500+j+2)=254
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b((ich-1)*500+j+248)=254
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b((ich-1)*500+j+495)=254
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enddo
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enddo
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! Mark the best ping with a red tick
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if(tbest.gt.0.0) then
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nx=tbest/0.060 + 1
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do j=110,120
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b((j-1)*500+nx0)=0
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b((j-1)*500+nx)=253
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enddo
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nx0=nx
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endif
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endif
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return
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end subroutine pix2d
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