Re: moving graphics objects on a map

Donald,

I'm just getting around to this part of the code again.
I didn't make any modifications to EditableOMCircle. I just overrode
the getGraphic() method to return my location graphic instead of the
default
omcircle. As I get further into this, I'll let you know.

I have another question converning serialization. I've noticed that most
(if not all) of the openmap package is serializable. I would think that
I would
issue a writeObject() command on the MapHandler, and that would
basically serialize all the
components and their state. Would you agree? Then when I want to reload,
I would somehow replace
the current application maphandler with the new (now unserialized)
maphandler. Any pitfalls I should be aware of
before jumping into this further?

jeff

Donald Dietrick wrote:
>
> Hi Jeff,
>
> On Friday, August 24, 2001, at 07:37 PM, Jeff Mathis wrote:
>
> > Donald,
> >
> > I actually have a Location, composed of OMText and an OMGraphic (an
> > OMCircle to be exact), that needs to be dragged around the map. I looked
> > and did not see an EditableOMLocation class, so I wrote one that
> > extended EditableOMCircle. I also added an EditToolLoader specifically
> > for my locations, and then used the OMDrawingTool.
> >
> > Getting both the circle and the text to move was a little challenging. I
> > may be doing this wrong, but in my drawingComplete(omgraphic, omaction)
> > method, I had to do the following in order for the moved circle and the
> > associated text to show up in the new location:
> >
> >
> > /**
> > * Specified by the DrawingToolRequestor interface. This method is
> > called after
> > * the edit has been performed on a given location
> > * @param omg the OMGraphic object, which should be a MapEntity
> > * @param oma the OMAction
> > */
> > public void drawingComplete(OMGraphic omg, OMAction oma) {
> > Debug.message("entitylocationlayer","EntityLocationLayer: called
> > drawingComplete");
> > // reset the text label based on the circles coordinates
> > // i'm not sure i understand it, but all of these calls are
> > necessary
> > LatLonPoint l =
> > ((OMCircle)((MapEntity)omg).getLocationMarker()).getLatLon();
> >
> >
> > ((OMCircle)((MapEntity)omg).getLocationMarker()).setVisible(true);
> > ((MapEntity)omg).setLocation(l.getLatitude(), l.getLongitude());
> > ((MapEntity)omg).generate(map.getProjection());
> > ((MapEntity)omg).render(map.getGraphics());
> > repaint();
> > }
> >
> > I'm not sure why I had to set the circle to be visible. I think I
> > understand why I needed to call both generate and render, and then
> > certainly repaint at the end.
> >
> > Could you comment on 5 method calls after defining the LatLonPoint? This
> > may again be much more of a Swing issue than OpenMap
>
> It's probably not a Swing issue, but more of the timing of actions that
> EditableOMGraphics go through to try and manage the MouseEvents. I
> think some if these actions usually get called in the EditableOMGraphic
> before the drawingComplete() gets called, but there may not be something
> happening as expected depending on the modifications you had to make to
> EditableOMCircle.
>
> Do you have to modify the circle, or just the placement of the
> location? It might be easier to work with EditableOMPoint when editing
> Location objects. That way, in the EditableOMGraphic.setGrabPoints()
> and EditableOMGraphic.setGrabPoints(OMGraphic), you can just work with
> the methods of the Location object. It's hard for me to say what's
> going on since I don't know what your are doing in EditableOMCircle.
>
> Let me know how confusing the Editable stuff is - what areas need more
> documentation, does it make sense, etc?
>
> Thanks,
>
> Don
>
> >
> > thanks,
> >
> > jeff
> >
> > Donald Dietrick wrote:
> >>
> >> Hi Jeff,
> >>
> >> All of the EditableOMGraphics are really meant to be used with the
> >> OMDrawingTool, although I suppose you could manage them through the
> >> layer. I've never tried it, though.
> >>
> >> You can use the DrawingTool from a layer, though. See the DemoLayer on
> >> how it uses it to create and edit graphics. By default, when the
> >> drawing tool is activated, a palette appears that provides other
> >> parameters for changing the attributes of the graphics. There is
> >> also a
> >> way to call it so that a GUI doesn't show up to allow the user to
> >> change
> >> all the other features of a graphic (other than position and size), if
> >> you want those attributes preserved.
> >>
> >> - Don
> >>
> >> On Thursday, August 23, 2001, at 11:26 AM, Jeff Mathis wrote:
> >>
> >>> hello again,
> >>>
> >>> I have a layer which has a locationhandler. the locationhandler
> >>> currently deals with a series of OMCircles to mark my locations of
> >>> interest. I now need to be able to click on one of these locations and
> >>> drag it to a new part of the map.
> >>>
> >>> I see there is an EditableOMCircle class, which I'm hoping has some of
> >>> the functionality I need. Is this correct? If so, any hints on the
> >>> best
> >>> way to use it?
> >>>
> >>> If this is a class I want to use, I know I'll have to change my
> >>> locationhandler to deal with an EditableOMGraphic instead of an
> >>> OMGraphic.
> >>>
> >>> thanks
> >>>
> >>> jeff
> >>> --
> >>> Jeffrey Mathis, PhD FAX: 505-988-2229
> >>> Senior Scientist email: jeff.mathis@biosgroup.com
> >>> Bios Group, Inc. phone 505-992-6737
> >>> 317 Paseo de Peralta http://www.biosgroup.com
> >>> Santa Fe, NM 87501
> >>>
> >>> --
> >>> [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"]
> >>>
> >>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> Donald F. Dietrick, dietrick@bbn.com
> BBN Technologies, 10 Moulton Street, Cambridge, MA 02138
> 617.873.3031 FAX 2794
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> >
> > --
> > Jeffrey Mathis, PhD FAX: 505-988-2229
> > Senior Scientist email: jeff.mathis@biosgroup.com
> > Bios Group, Inc. phone 505-992-6737
> > 317 Paseo de Peralta http://www.biosgroup.com
> > Santa Fe, NM 87501
> >

-- 
Jeffrey Mathis, PhD		FAX: 505-988-2229
Senior Scientist		email: jeff.mathis@biosgroup.com
Bios Group, Inc.		phone 505-992-6737
317 Paseo de Peralta		http://www.biosgroup.com
Santa Fe, NM 87501
--
[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"]