On Mon, 20 Nov 2017 18:43:40 +0000 (UTC), Eli the Bearded
 declaimed the following:


>Elijah
>------
>hasn't written Xt code in a long time

 Has anyone?

 It was near 30 years ago that I ended up writing about 2500 lines of C
for DEC's variant of X -- DECWindows -- with GKS embedded!, another 2500
lines of user interface language describing the application, and about 500
lines of F77.

 The requirement was to replace a RAMTEK 9300 graphics engine -- but the
original applications[s] could not be rewritten; the F77 was to mock up all
the RAMTEK primitive calls into messages sent via VMS mailboxes to the C
program which interpreted the messages. GKS was needed for the display list
feature, as one could not ask the operator to rerun a 30-minute application
to refresh the display -- and the F77 application consisted of some 30-odd
dedicated programs which connected to the graphics engine to display
 [plot axis and labels were handled by one program, then another
program would fill in the plot, another program would be run to define a
rubber-band region, etc.]; GKS display lists allowed rapid replay of the
sequence that rendered the image.
--
 Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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