Re: [OpenMap Users] Re centre map

Hi Mark,

You can grab a reference to the MapBean in the findAndInit method on
your layer. It gets called whenever an object gets added to the
MapHandler, and the MapBean will get delivered there eventually.

So, you need to test for it:

public void findAndInit(Object obj) {

        if (obj instanceof MapBean) {
              _map = (MapBean)obj;
        }
}

There will be only one MapBean in a MapHandler (it's a
SoloMapBeanComponent). For completeness, you'll want to implement the
findAndUndo(Object) method, too, and set your _map to null if that
method is called and the Object == _map. You'll want to do null
checking on _map throughout your layer, too.

- Don

On Apr 22, 2004, at 8:21 AM, Gatrell, Mark (UK) wrote:

>
> Don
>
> Thanks for your response..
>
> I have tried to reference my map bean from my layer, but to be honest
> I can't figure out how to do it.
>
> As you say a handle to the correct map bean needs to be established,
> then my setprojection calls will effect the map.
>
> Could you steer me in the right direction?
>
> Thanks again
>
> Regards
>
> Mark.
>
> -----Original Message-----
> From: Don Dietrick [mailto:dietrick@bbn.com]
> Sent: 22 April 2004 13:11
> To: Gatrell, Mark (UK)
> Cc: Openmap-Users (E-mail)
> Subject: Re: [OpenMap Users] Re centre map
>
>
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>
> On Apr 22, 2004, at 4:18 AM, Gatrell, Mark (UK) wrote:
>
>>
>> Don
>>
>> I am trying to re center my map on the result of a gps position
>> change...
>>
>> I have been trying to understand Brian Hudson answer to Jaya back in
>> Feb (RE moving icon)but have come to a dead end!
>>
>> My code so far is :- (Direct copy of Brians!) within my extended
>> version of OMGraphicHandlerLayer.
>>
>>
>> Proj proj = (Proj)getProjection().makeClone();
>> proj.setCenter(newLatPosition,newLongPosition);
>>
>> This compiles fine..
>>
>> But I do not understand the next line...
>>
>> _map.setProjection(proj);
>>
>> I have tried to repaint my MapBean, but this has no affect.
>>
>> Would you be so kind as to explain _map ?
>
> _map is probably a handle to a MapBean. You have to set the projection
> on the map so that all of the layers know to react to the change.
> Calling setProjection() fires events and will cause the layers to react
> and repaint.
>
> - Don
>
>
>
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