[mapguide-users] Selection problem with map stored in session repository

[Ismael Cams]

Hello,

I was able to isolate the problem. In the layout that was causing the
problem I turned on the legend, but disabled the properties pane. After done
another test in the MapGuide Studio I noticed it was causing the same
problem when turning off the properties pane and enable the legend.
I did not investigate if this is a general problem or if it is specific for
the situation I am encountering.

Is this sufficient to report a bug (problem with selection of features on
pointlayer when legend is enabled and properties pane disabled) ?

Thanks for the help Kenneth, it pointed me in the direction of the final
solution.

Kind regards,
Ismaël


Kenneth, GEOGRAF A/S wrote:
> 
> I belive that the function you should examine is this:
> 
>     function ScreenToMapUnits2(x, y, bAllowOutsideWindow)
>     {
>         if(!bAllowOutsideWindow)
>         {
>             if(x > mapDevW - 1) x = mapDevW - 1;
>             else if(x < 0) x = 0;
> 
>             if(y > mapDevH - 1) y = mapDevH - 1;
>             else if(y < 0) y = 0;
>         }
> 
>         x = extX1 + (extX2 - extX1) * (x / mapDevW);
>         y = extY1 - (extY1 - extY2) * (y / mapDevH);
>         return new Point(x, y);
>     }
> 
> You then have to determine if it is extY1, extY2 or mapDevH that is wrong.
> Once you find that out, you should examine areas where they get 
> calculated, to further narrow it down.
> 
> Regards, Kenneth, GEOGRAF A/S
> 
> 
> 
> Ismael Cams skrev:
>> Thanks for the answer Kenneth.
>>
>> I have checked the coordinates and they are indeed skewed. The x
>> coordinates
>> are ok, but the y coordinates do not match (which explains why I have to
>> click somewhat above the point in order to select it). As soon as I
>> resize
>> the legend frame the coordinates get ok.
>>
>> The MCS part is not clear to me. Can I somehow make changes to this
>> functions in order to solve the problem or can I try something else
>> (without
>> having to disable my legend) ? 
>>
>> For your notice: I make also selections programatically. This works fine
>> in
>> all cases. 
>>
>>
>> Kenneth, GEOGRAF A/S wrote:
>>   
>>> I would say that the offset is likely caused by something incorrect on 
>>> the html side.
>>> If point 7 means: create 2 layouts in studio and test them in the same
>>> app,
>>> it would appear that a setting in the WebLayout file causes the html to 
>>> report bad map offsets.
>>>
>>> You might see the actual coordinats being sent, by inserting an 
>>> "alert(...)" in ajaxmappane.templ,
>>> where it builds the polygon (search for "POLYGON").
>>>
>>> If the coordinates are correct (ea. the same), I have no clue.
>>>
>>> If the coordinates are skewed, look in the ajaxmappane.templ,
>>> for the function that calculates the MCS coordinates from screen (x,y).
>>> That functions has some offsets, and it is my guess that they slip a
>>> bit.
>>>
>>> Regards, Kenneth, GEOGRAF A/S
>>>
>>>
>>>
>>> Ismael Cams skrev:
>>>     
>>>> I have following situation:
>>>>
>>>> 1. I build dynamically two weblayouts in a session. One is containing a
>>>> legend, the other one is only containing the zoom control.
>>>> 2. The weblayouts refer to the same mapdefinition that is also build in
>>>> a
>>>> session.
>>>> 3. The mapdefinition is referring to a point layer (sessionlayer)
>>>> 4. Making a selection in the weblayout without legend works fine.
>>>> 5. Making a selection in the weblayout with legend does not work
>>>> correctly.
>>>> I have to click above the point to actually make the selection.
>>>> 6. When I minimize the legend frame (by using the arrow in the
>>>> webbrowser)
>>>> the selection suddenly works correctly. Also when I disable the legend
>>>> in
>>>> the first layout this is also working fine.
>>>> 7. When I create the same scenario with Studio I do not encounter the
>>>> problem (selection is working without problems).
>>>>
>>>> I believe it has something to do with using the same session, but I do
>>>> not
>>>> have a clue where to look after. Can someone give me hints about what
>>>> could
>>>> be the problem ?
>>>>
>>>> Kind regards,
>>>> Ismaël
>>>>   
>>>>       
>>> _______________________________________________
>>> mapguide-users mailing list
>>> mapguide-users at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>>>
>>>
>>>     
>>
>>   
> 
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> 
> 

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