/usr/share/gle-graphics/4.2.3b/gleinc/contour.gle is in gle-graphics 4.2.3b-2ubuntu1.
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! !
! GLE - Graphics Layout Engine <http://www.gle-graphics.org/> !
! !
! Modified BSD License !
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! Copyright (C) 2009 GLE. !
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! Subroutines to draw contour plots
sub contour_labels file$ format$
! draws the labels on a contour plot
!
! file$ = filename of file with label data
! fmt$ = format string used to format labels
set just cc hei 0.25 color blue
fopen file$ f1 read
until feof(f1)
fread f1 x y i v
amove xg(x) yg(y)
s$ = format$(v, format$)
begin box add 0.05 fill white
write s$
end box
write s$
next
fclose f1
end sub
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