Re: [Gwt-openlayers-users] Google Maps Issue

[AbdElhadi <abd...@gm...>]

Thanks Edwin!

On Mon, Jul 13, 2009 at 9:35 AM, Edwin Commandeur <
com...@gm...> wrote:

> Hi Abdelhadi,
>
> The problem you encounter with the Google maps layer seem to be quite
> nasty. Unfortunetaly I am also pretty stacked with work, so I am not sure
> when I have time to dive into this.
>
> With the WMS the any layer can be transparent, as long as the image format
> you select supports this. The setIsTransparent property is a property on the
> params object if I am correct and it sets a parameter of the WMS request. In
> the WMS specification there is a parameter transparent that indicates if
> places for which no data is avalaible should be rendered transparent
> (otherwise they are rendered to some default colour of the WMS, probably
> white or black). Setting isTransparent has nothing to do with the
> transparency of the complete layer in the OpenLayers map, which you can
> indicate by a float on the WMS object.
>
> BaseLayers are kind of a strange beast. They were needed to support
> third-party layers like Google Maps, as far as I understand. We are using
> WMS layers and the baselayer is some transparent fixed image that is not
> shown in the LayerList.
>
> Greetings,
> Edwin
>
> 2009/7/13 AbdElhadi <abd...@gm...>
>
> Hi Edwin,
>>
>> Sorry for taking this long to answer your email. It's a little bit crazy
>> at work lately and I haven't gotten the time to look at this until now.
>>
>> In my previous email, I was refering to the Google maps layer and not any
>> WMS layer. And I tested this in the hosted mode browser, firefox 3.5 and IE6
>> and it behaves the same in all of them. Plus, I am not using EXT-GWT (YET)
>>
>> But, going back to the wms, playing with the transparency, I came across
>> another issue. It seems that a wms layer has to be set as Baselayer in order
>> for it to be transparent. Otherwise you get no maps. Have you ever
>> encountered this?
>> By looking at both the gwt-openlayers and the Javascript openlayers code
>> (not so confidently since I am still a js newbie), it seems that the
>> setIsBaseLayer does much more than just setting some property to true, which
>> setIsTransparent does.
>>
>> Thanks again,
>>
>> Cheers,
>> -Hadi
>>
>>
>> On Wed, Jul 8, 2009 at 3:36 AM, Edwin Commandeur <
>> com...@gm...> wrote:
>>
>>> Hi Abdelhadi,
>>>
>>> With respect to issue 1. Do you see that in a plain GWT application? And
>>> is it across browsers?
>>>
>>> We have a problem like you are describing when using Ext-GWT, where WMS
>>> layers only load in a small corner of the map, until resize. This happens
>>> only in Firefox for us. In Firefox 3.5 the map is completely gone. We do not
>>> experience this problems in a plain GWT app and it seems to have something
>>> to do with the lifecycle of Ext-GWT components (they only get a size when
>>> rendered if I am correct).
>>>
>>> Greetings,
>>> Edwin
>>>
>>> 2009/7/7 AbdElhadi <abd...@gm...>
>>>
>>> Thanks Edwin. I appreciate it.
>>>>
>>>>
>>>> On Tue, Jul 7, 2009 at 4:00 AM, Edwin Commandeur <
>>>> com...@gm...> wrote:
>>>>
>>>>> Hi AbdelHadi,
>>>>>
>>>>> Thanks for giving feedback on using the Google Maps layer. I really
>>>>> appreciate that you share your experiences.
>>>>>
>>>>> Issue 1 you are describing is something that I have seen before for WMS
>>>>> layers on Firefox, but only in a Ext-GWT app (strangely enough it does not
>>>>> happen in the showcase). Up to now I have not been able to track down the
>>>>> problem. This is one to drill down on when I have some time, because it is a
>>>>> nasty problem.
>>>>>
>>>>> Issue 2 could have something to do with the isFixed property of
>>>>> EventPane, but that is purely upon glancing the API docs. Anyway, I added
>>>>> EventPaneOptions and GoogleOptions now extend this class.
>>>>>
>>>>> The function setSphericalMercator is a setter for the sphericalMercator
>>>>> property of the Goolge Layer in OL. It also strikes me as strange to have
>>>>> such a property on the Google Layer itself, as it affects the entire map,
>>>>> but it looks like a convenience feature of OL to set a property on the
>>>>> Google Layer in order to make vector layers and the like work.
>>>>>
>>>>> Greetings,
>>>>> Edwin
>>>>>
>>>>> 2009/7/6 AbdElhadi <abd...@gm...>
>>>>>
>>>>>>  Hi all,
>>>>>>
>>>>>> I was able to get a Google map to show up but not without many issues.
>>>>>> All I had to do is to add the google maps api script call to the host html
>>>>>> and add the following to my code:
>>>>>>
>>>>>> //      create a google maps layer
>>>>>>         GoogleOptions ggLayerOptions = new GoogleOptions();
>>>>>>         ggLayerOptions.setSphericalMercator(false);
>>>>>>         Google ggLayer = new Google("Google Base", ggLayerOptions);
>>>>>>         myMap.addLayer(ggLayer);
>>>>>>
>>>>>> The issues I am getting are as follow:
>>>>>>
>>>>>> 1- First, on page load, the GoogleMaps layer seems to cover a small
>>>>>> area of the map extent until there is a resize event then it takes the same
>>>>>> dimensions as the MapWidget.
>>>>>> 2- GM doesn't respond to pan/move events when you use
>>>>>> setSphericalMercator(true). Also, why is there such a function since all
>>>>>> Google Maps are in Spherical Mercator?
>>>>>>
>>>>>> I am still playing with this and will report on more as I find them.
>>>>>>
>>>>>> Thanks,
>>>>>> --
>>>>>> Abdelhadi
>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------------------
>>>>>>
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>>>>>>
>>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Abdelhadi
>>>>
>>>
>>>
>>
>>
>> --
>> Abdelhadi
>>
>
>


-- 
Abdelhadi