Expansive OMGraphicHandlerLayer.repaint();

I finally have my application up and running. I appreciate Don's hint to make my
work easy. I, however, couldn't tune up the performance. The real time back end,
a propitiatory legacy system written in C, provides a set of data through a socket
every 200 ms in my current design. In other words, my application need to update
the layer at the rate of 5 Hz to provide satisfactory smooth movement. In two
simple case experiments, a dynamic object moving around and none at all, the
method OMGraphicHandlerLayer.repaint() consumes almost all CPU time (I have a Sun
workstation running at 450 MHz). Did I do anything wrong? Or, is that the nature
of repaint()?

This is my current setup. The layer is a subclass of OMGraphicHandlerLayer. I
use a triangle (OMBitmap) with a label (OMText) to represent the location and
direction for each dynamic object. These two were stored in an OMGraphicList.
Repaint() is called in every 200 ms to update the layer. Is there any more
efficient way to achieve the same goal?

-Sunny

Don Dietrick wrote:

> Hi Sunny,
>
> You have a number of options here, and most of them involve getting
> access to the MapHandler. Once you have the MapHandler, you can pretty
> much get to any component.
>
> Using the MapHandler, you can location the LayerHandler, get it's
> layers, and iterate through them to find your layer.
>
> Alternatively, the Layer class has a property, addToBeanContext, that
> is false by default (layers are isolated from the MapHandler by
> default). If you set that to true in the properties file, the layer
> will be added directly to the MapHandler, and you can iterate through
> the MapHandler objects to find your layer.
>
> You could have your back-end create the layer and add it to the
> MapHandler, where the LayerHandler will pick it up to add it to the map
> (if it's visible). You wouldn't need to define layer properties for it
> at all in that case.
>
> Lastly, with the next version of OpenMap due out shortly, the
> com.bbn.openmap.plugin.graphicLoader.GraphicLoader interface has been
> formally defined as an object that provides OMGraphics on it's own
> schedule (the graphicLoader package and pilot package have been
> adjusted accordingly). If a GraphicLoader (which is what your back-end
> basically is) gets added to the MapHandler (say, by defining it in the
> openmap.components property or whatever), the LayerHandler has been
> updated to create a GraphicLoaderPlugIn/PlugInLayer combination to
> display its graphics.
>
> Hope this helps,
>
> Don
>
> On Wednesday, September 4, 2002, at 11:28 AM, Shih-Hung Lin wrote:
>
> > Hi, Group,
> >
> > I am new to OpenMap development and wish someone here would help me
> > with some basics. I am currently working on a new layer with dynamic
> > objects which reflects the state of a real-time back end. So far I
> > have those objects static displayed on the layer. I use
> > "openmap.properties" as following to define the layer and it show up
> > as I expected.
> >
> > openmap.layers=..... dynamic .....
> > :
> > :
> > dynamic.class=com.xyz.layer.DynamicLayer
> > dynamic.prettyName=Dynamic Objects
> > :
> >
> > In order to move them, I need to grab a reference to the layer. I
> > wonder if there is a standard way to get references to individual
> > layers defined in property file.
> >
> > -Sunny
> >
> >
>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> Don Dietrick, BBN Technologies, dietrick@bbn.com
> 10 Moulton Street, Cambridge, MA 02138
> 617-873-3031 [fax]-2794
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>
> --
> [To unsubscribe to this list send an email to "majdart@bbn.com"
> with the following text in the BODY of the message "unsubscribe openmap-users"]

--
[To unsubscribe to this list send an email to "majdart@bbn.com"
with the following text in the BODY of the message "unsubscribe openmap-users"]