Experimental Physics and
Industrial Control System
Rotation is not supported, sorry. The use of the angle is to simply provide
a rotated coordinate system. I actually built the widget in an afternoon
the location of a crane. The scheme made it easy to track the movement
of the crane
bridge along one axis and the trolley along the other with both moving
in a coordinated system
that was rotated with respect to the screen.
I have refrained from spending too much time documenting new features as
a result of the current direction
of the EPICS community with regard to software tools. On the other hand,
I will always work with someone
to provide better documentation, bug fixes, and support on request. I am
in the same boat as all EPICS developers
who support legacy tools. We are committed to the institutions that use
the old software but we also have full-time
jobs that normally have nothing to do with supporting that software.
Note that the new display manager, BOY, which is part of CSS is much
more sophisticated with regard
to scaling and rotation of images. It can probably do what you want (I'm
still a novice BOY user so I don't
know the details off the top of my head). The biggest problem with the
old Xwindow-based graphic models is
the handling of text. The new tools incorporate a much more flexible
model for transforming the rendering of text.
With regard to your original question, there might be a way to achieve
the behavior you desire as long as you can
live with a somewhat coarse resolution in the rotating motion but its
probably too much work. If you are interested
in pursuing this let me know.
I have been trying to use an animated symbol widget to represent
something on a rotational axis on an EDM screen with a symbol
consisting of a filled square on a dotted line circle. I anticipated
the Angle PV could be set to a value which would cause the symbol to
be rotated about its centre to the specified orientation angle.
Instead the behaviour seems to be that it causes the centre of the
widget as defined by the X PV and Y PV relative to be rotated about
the centre as defined by the X and Y field values. In other words,
it moves the widget, but keeps the same orientation, which does not
seem terribly useful as that could be achieved by manipulating X PV
and Y PV.
Is this the intended behaviour? Is there documentation available on
the Animated Symbol widget? (Please note Diamond cannot access APS
EPICS site at the moment – see other thread). Has anyone got a
working example of something similar?
Software Systems Engineer
+44 (0)1235 778058
Diamond Light Source Ltd
Harwell Science and Innovation Campus
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ANJ, 18 Nov 2013