GLE Example: polenja.gle

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size 18 19

include "color.gle"

set lwidth .02 hei .7 font texcmr
imax = 0; imaxc = 0

dpsi = 2.5; dphi = 2.5
! dpsi = stepwidth in psi direction, i.e. angle of latitude or elevation;
! dphi = stepwidth in phi direction, i.e. angle of longitude or azimuth.

file$ = "serguei2.nja"

! open result file with three rows: psi   phi   intensity
! first open to find overall maximum intensity = imax
! and maximum intensity at center = imaxc (i.e. for psi=0)

fopen file$ inchan read
until feof(inchan)
   fread inchan psi phi i
   if i>imax then
      imax = i
   end if
   if psi=0 then
      if i>imaxc then
         imaxc = i
      end if
   end if
next
fclose inchan

! now open result file for actual plotting
! colors are defined with rgb color scheme:
!     rgb(0,0,1) (i.e. blue) corresponds to i=0
!     rgb(1,0,0) (i.e. red) corresponds to i=max
fopen file$ inchan read
until feof(inchan)
   fread inchan psi phi i
   amove 8.2 8.2
   if psi=0 then
      circle dphi fill cvtrgb(imaxc/imax,0,1-imaxc/imax)
   else
      begin path fill cvtrgb(i/imax,0,1-i/imax)
         arc 8*sin(torad(psi+dpsi/2))/(1+cos(torad(psi+dpsi/2))) phi-dphi/2 phi+dphi/2
         narc 8*sin(torad(psi-dpsi/2))/(1+cos(torad(psi-dpsi/2))) phi+dphi/2 phi-dphi/2
      end path
   end if
next
fclose inchan

! labeling
circle 8
for c = 0 to 3
   begin rotate c*90
      rmove 8 0
      rline 0.2 0
   end rotate
next c

rmove 8.2 0
set just lc
write "\varphi =0\movexy{-.15}{0}\char{23}"
rmove -8.2 8.2
set just bc
write "\varphi =90\movexy{-.15}{0}\char{23}"

amove 8.2-5 17.5
begin name range
   colormap "x" 0 1 0 1 100 1 10 1 palette palette_blue_purple_red
end name

amove pointx(range.lc)-0.1 pointy(range.lc)
set just rc
write "I = 0"

amove pointx(range.rc)+0.1 pointy(range.rc)
set just lc
write "I = max."

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