Hi,
I suspect the issue is not plplot itself but how it & cairo interprete
info passed from gtk (the cc structure below). In my sample code, the
plplot part, except for cc calls, does exactly what is
contained in your simplest ext-cairo-test.c example. The extra
fortran code is needed to
open window and generate the on-screen area handle passed to plplot via
calls
cc = hl_gtk_drawing_area_cairo_new(area) <--*** this is gtk
....
call pl_cmd(PLESC_DEVINIT, cc) <--this is already plplot
I am not expert and do not know how to make it still simpler.
However, if Allan example did not contain these two lines
it would fail to test the whole problem. Removal of the
of the gtk part of my fortran code would kill
any test of interaction with the user defined gui window.
I would like to stress that the issue is not cairo itself but how
it communicates with the gtk on-screen gui interface. I am open to the
prospect that the problem is on the gtk side and not plplot.
However, I belive the interaction of plplot with gui soft is
worth investigation. Accepting of the area info
from gtk IS NOT TESTED in your ext-cairo-test.c example. That example
generates an image file/onscreen plot, without any flexible gui
interaction controlled by the user. In this regard cursor is
a rigid-preprogrammed procedure and not true gui front.
Neither plplot nor cairo were intended to operate gui forms
logins etc hence gtk-fortran could be vital extension of plplot in that
direction. To be specific I am thinking of an on-screen gui for operation
of BRITE satellite ground station. The gtk part would accept commands,
report status etc. plplot would be called to fill several windows with
science plots: satellite position on sky/in space and/or quick look plots
of astronomical data.
Best regards,
Alex
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