Re: Basic question -- I am missing the "big picture" ...

I promise, you'll have as zip file of stuff within a week.

jeff
At 05:56 PM 4/30/2002 -0400, Don Dietrick wrote:
>Hi Jeff,
>
>On Tuesday, April 30, 2002, at 05:26 PM, Jeff Mathis wrote:
>
>>Well, it could very well be that I am missing the big picture, in that
>>I'm really using the wrong tools to do what I need.
>>
>>Our application has several layers. Each layer has one or more data
>>handlers. The data handlers, which all ultimately extend
>>AbstractLocationHandler, are responsible for populating the OMGraphicList's.
>>
>>As the application runs, all the information in the various datahandlers
>>change. I stumbled onto the doPrepare() method as a convenient way to do
>>it all: regather the graphic objects, project, render and paint, all
>>within its own SwingWorker thread. I created a manager class that kicks
>>off the doPrepare() for each layer, then listens for LayerStatusEvent's
>>to determine when all the threads have completed. When this manager's
>>methods are called, they don't return until the painting is done, which
>>was important for us.
>
>Sounds like a solid approach to me.
>
>>
>>I was doing all the necessary calls myself. Using doPrepare() simplifies
>>my life.
>
>That's why it's there. :) I just meant that it wasn't a *Layer* method,
>and that it's just in some layers.
>
>>As a side note Don, I had told you awhile ago we would send you some
>>screen shots and description of our product. We have been waiting for
>>client sign off, which we now have. See the article below for a
>>description of the application. We use OpenMap in the GUI to draw all the
>>things going on with their North American operations.
>>
>><http://globalarchive.ft.com/globalarchive/article.html?id=020430000298&query=>
>>tom+lloyd>http://globalarchive.ft.com/globalarchive/article.html?id=020430000298&
>>query=tom+lloyd
>
>Thanks for sending the link - was there a screen shot? Very interesting.
>
>- Don
>
>>
>>Jeff
>>
>>At 01:19 PM 4/30/2002 -0400, Don Dietrick wrote:
>>>I just wanted to mention a couple of things:
>>>
>>>The doPrepare() isn't a standard Layer method - it only exists on
>>>certain layers. Ed, you may want to check out different OpenMap layers
>>>to see how it is used, usually to kick off a SwingWorker to tell a layer
>>>to re-gather graphics, project them and call repaint().
>>>But, if your OMGraphics are pretty set, you can create a method (if you
>>>don't have one) to just project your graphics and call repaint().
>>>
>>>How you manage your OMGraphics is completely up to you - you may want to
>>>create them in the constructor, you may want to provide a method in your
>>>layer so that other objects can create them. You may even want an
>>>object in the MapHandler to hold on to them instead of your layer.
>>>It all depends on how you want to organize and display your data. All a
>>>layer is *really* responsible for, when you get right down to it,
>>>is painting the OMGraphics in the right spot on the map relative to
>>>other layers (depth). You just need to try to make sure that the only
>>>thing that gets done in the paint() method of a layer is rendering.
>>>Doing more makes the application feel slower.
>>>
>>>I don't think you want the MapHandler to be doing more than it already
>>>does, which is enabling objects to find each other. If anything, I
>>>would let a different object create your layer's OMGraphics, and then
>>>use the MapHandler to let the layer find that object to get the graphics
>>>(or vice versa). This requires that there some design coordination
>>>between the layer and the object, but that's cool.
>>>
>>>- Don
>>>
>>>On Tuesday, April 30, 2002, at 12:04 PM, Jeff Mathis wrote:
>>>
>>>>Hi Ed,
>>>>
>>>>Glad to see you still hacking away.
>>>>
>>>>We do this all the time, as you might know. The key is when an object
>>>>has been changed, you need to render the graphic and then repaint the layer.
>>>>
>>>>The doPrepare() method on Layer does most of this for you. What you
>>>>have to realize here is that each layer is repainted in its own thread,
>>>>but if you don't care then no extra handling is needed.
>>>>
>>>>Here is a snippet. This method is executed after the user is done
>>>>dragging a map object to a 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
>>>> MapEntity ent = (MapEntity)omg;
>>>> OMGraphic g = ent.getLocationMarker();
>>>> com.biosgroup.alac.model.general.Location newloc = null;
>>>> if (g instanceof OMRect) {
>>>> OMRect rect = (OMRect)g;
>>>> ent.setLocation(rect.getNorthLat(), rect.getWestLon());
>>>> newloc = new
>>>> com.biosgroup.alac.model.general.Location((float)rect.getNorthLat(),
>>>> (float)rect.getWestLon());
>>>> } else if (g instanceof OMCircle) {
>>>> OMCircle circ = (OMCircle)g;
>>>> LatLonPoint l = circ.getLatLon();
>>>> ent.setLocation(l.getLatitude(), l.getLongitude());
>>>> newloc = new
>>>> com.biosgroup.alac.model.general.Location((float)l.getLatitude(),
>>>> (float)l.getLongitude());
>>>> }
>>>> ((Locatable)ent.getAppObject()).setLocation(newloc);
>>>> g.setVisible(true);
>>>> ApplicationState.fireApplicationChangeEvent(
>>>> new ApplicationChangeEvent(this,
>>>>
>>>>ApplicationChangeEvent.LOCATION_EDITED));
>>>> }
>>>>
>>>>then, when the ApplicationChangeEvent is received by my layer manager,
>>>>it calls doPrepare() on the layer to repaint itself.
>>>>
>>>>At 09:40 PM 4/29/2002 -0600, Ed MacKerrow wrote:
>>>>
>>>>>Dear OpenMappers,
>>>>>
>>>>>I am still on the steep end of the OM learning curve and I think I
>>>>>missing out on the "bigger picture".
>>>>>
>>>>>I have built a few layers that I have been able to display my objects
>>>>>on, however, I did this by instantiating the objects, which are
>>>>>displayed by association with a OMGraphic that has the same (lat,lon)
>>>>>as the App objs. The mistake that I believe I have done, is to
>>>>>instantiate these objects and OMGraphics by calling a "buildObjs()"
>>>>>method from inside the constructor for the layer. The layer
>>>>>constructor is invoked from the properties file call (i.e. like in the
>>>>>OpenMap app). Should I be instantiating these objects from a
>>>>>mapHandler instead?
>>>>>
>>>>>The reason I am asking is that I don't know how to update the
>>>>>positions of those objects on the layer, since I do not have an
>>>>>instantiated object that represents my layer class. I guess my basic
>>>>>question is:
>>>>>
>>>>>How do I update the position values of objects that are displayed on a
>>>>>layer? ( are there any simple examples of updating the positions of
>>>>>objects that are displayed on a layer out there?)
>>>>>
>>>>>Thanks for your help,
>>>>>
>>>>>ed
>>>>
>>>>Jeff Mathis
>>>>Senior Scientist / Group Leader
>>>>BiosGroup, Inc.
>>>>317 Paseo de Peralta
>>>>Santa Fe, NM 87501
>>>>direct: 505-992-6737
>>>>fax: 505-988-2229
>>>>jeff.mathis@biosgroup.com
>>>>http://www.biosgroup.com
>>>>
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>>>>[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"]
>
>
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>Don Dietrick, BBN Technologies, dietrick@bbn.com
>10 Moulton Street, Cambridge, MA 02138
>617-873-3031 [fax]-2794
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>>
>>Jeff Mathis
>>Senior Scientist / Group Leader
>>BiosGroup, Inc.
>>317 Paseo de Peralta
>>Santa Fe, NM 87501
>>direct: 505-992-6737
>>fax: 505-988-2229
>>jeff.mathis@biosgroup.com
>>http://www.biosgroup.com

Jeff Mathis
Senior Scientist / Group Leader
BiosGroup, Inc.
317 Paseo de Peralta
Santa Fe, NM 87501
direct: 505-992-6737
fax: 505-988-2229
jeff.mathis@biosgroup.com
http://www.biosgroup.com

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