[mapguide-users] Erratic display of feature labels

[Jackie Ng]

Hi Traian,
 
I would like to try your first solution (turn off overpost detection) but
the layer in question is a polygon layer with area styles. There is no
option available to turn off overposting.

Regards,

Jackie Ng

AEC Spatial Pty Ltd. / AEC Systems Pty Ltd.
SYDNEY - MELBOURNE - BRISBANE - PERTH - ADELAIDE - HOBART 

A.B.N: 32 075 809 451

Level 4, 37-41 Prospect St. Box Hill, Victoria, 3128

Phone: 1300 368 609 
Fax:    1300 362 140 

www.aecsystems.com.au 
jackie.ng at aecsystems.com.au

 

  _____  

From: Traian Stanev [mailto:traian.stanev at autodesk.com] 
Sent: Tuesday, 10 October 2006 11:51 PM
To: users at mapguide.osgeo.org
Subject: RE: [mapguide-users] Erratic display of feature labels


 
 
This is caused by, how can I say it, impefections, in the label occlusion
avoidance algorithm. The problems happen especially when text is rotated, in
which case the bounding box used to compute the region covered by the label
is no longer tight. This, combined with the fact as new features appear on
the map, the order labels get processed changes, causes the behavior you
describe. So it is currently normal for some labels to disappear and appear
depending on the view. One solution I could offer is to turn off label
overpost detection for the layer -- there is a checkbox for that in Studio,
in the style dialog -- this would cause all labels to draw. Another solution
would be to use a tiled map, which would result in a more fixed labeling,
but then some labels may just never show up. A third solution may be to use
a smaller font so that more labels fit. A fourth solution is for us to
improve the labeling to deal with non-axis-aligned bounds. :-)
 
 
Traian
 

  _____  

From: Jackie Ng [mailto:jackie.ng at aecsystems.com.au] 
Sent: Tuesday, October 10, 2006 4:30 AM
To: users at mapguide.osgeo.org
Subject: [mapguide-users] Erratic display of feature labels


Hi All,
 
I am experiencing a very strange problem with the display of feature labels.
Basically the map is only showing a subset of all the feature labels that
are actually there. At closer zoom levels, when I am panning around on my
map, some labels will magically disappear while some will magically appear.
The attached images will better explain the problem. 
 
The "before" image a partcular close-up view of the map. 
The "after" image is the same view, panned slightly to the right. 
The "after-more" image is the "after" view panned slightly up.
 
The selected polygon in blue is the same polygon for all 3 images.
 
Notice how some labels disappear and some appear during these transitions? 
 
Help me :(

Regards,

Jackie Ng

AEC Spatial Pty Ltd. / AEC Systems Pty Ltd.
SYDNEY - MELBOURNE - BRISBANE - PERTH - ADELAIDE - HOBART 

A.B.N: 32 075 809 451

Level 4, 37-41 Prospect St. Box Hill, Victoria, 3128

Phone: 1300 368 609 
Fax:    1300 362 140 

www.aecsystems.com.au 
jackie.ng at aecsystems.com.au

 
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