Experimental Physics and
Industrial Control System

John William Sinclair <[email protected]> · Tue, 06 Mar 2012 12:15:10 -0500

Hi Linda,

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

to display

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.

John Sinclair

[email protected] wrote:

Dear All,

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?

Thanks,

Linda Pratt

Software Systems Engineer

Controls Department

[email protected]

+44 (0)1235 778058

www.diamond.ac.uk

Diamond Light Source Ltd

Diamond House

Harwell Science and Innovation Campus

DIDCOT

Oxfordshire

OX11 0DE

UK

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System