[mapguide-users] Fluctuating Cursor Accuracy

[Traian Stanev]

It is likely (incorrectly) treating the remaining rings of the polygon
as holes and the intersection check fails for them. This instersection
check is done by the FDO provider, so it would be the SHP FDO provider
that is doing intersection wrong. One thing you could try - convert your
SHP to SDF and see if it still fails. SDF uses the same code for
intersection, but may be the geometry will be converted to the right
kind of multi-polygon during the conversion step. I know... this sounds
more like a cooking recipe than a fix, but it may help.

 

Traian

 

 

 

From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Ryan
Northcott
Sent: Tuesday, October 30, 2007 4:35 PM
To: MapGuide Users Mail List
Subject: Re: [mapguide-users] Fluctuating Cursor Accuracy

 

I've noticed this as well, and it appears to be just the way the
mapframe reads your x,y location. So the further zoomed out your scale
is, the harder to precision grab the x,y.

 

Now for the fun stuff. I create shapefiles out of ArcView 3.2 that are
multi-part polygons. (So two or more seperate polygons for one feature),
and it would appear, that you can't select, or Task-panel click on the
multi-part polygons other than the first one in the feature, to get a
selection. 

 

For example, a multi-part polygon with a 0.25 Acre triangle corner
polygon on the other side of a road, and a 100 Acre square polygon, if
the the 0.25 acre sized polygon has it's vertices index first, you can
only hit that small polygon in order to pull the attributes of the
feature. Clicking on the Larger 100 Acres polygon doesn't create a hit. 

 


 
 

On 10/30/07, IT-Joe Marvin <JMarvin at redwoodcity.org> wrote: 

When using an AJAX map, cursor is not always aligned properly.  

 

For example,  if I go to select a polygon, sometimes the polygon on the
tail or middle of the cursor is selected, instead of the point of the
cursor.    It seems to vary each time I load the page, sometimes it is
correct, other times it is not.  This is very confusing to users who
think they are clicking on one polygon and actually clicking on another.


 

Has anyone else encountered this problem, or even better, found a fix?

 

Thanks


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