Traian,
my understanding was that I should be using GetMapImage for drawing
the map and GetVisibleMapExtent/GetDynamicMapOverlay for the
selection. And in fact, I think Trevor modified GetDynamicMapOverlay
to allow rendering just the selection.
From what you said below, it now appears that I should be using
GetVisibleMapExtent/GetDynamicMapOverlay for rendering map draws.
Note that this is problematic for OpenLayers because it currently uses
a synchronous AJAX call to GetVisibleMapExtent which is not desirable
and will require a rework of the MapGuide support in OpenLayers to
allow this to be done asynchronously.
Is there any reason why the two operations would be implemented
differently? Is one more correct than the other?
Cheers
Paul
On 15-Feb-08, at 6:20 PM, Jason Birch wrote:
Traian, Paul,
I observed considerable performance degradation between the old
version
of Fusion (pre-MGOS) that used GetDynamicMapOverlay instead of GetMap.
This was with my Cemetery map data that has the nasty buffered roads
layer. Sheboygan seemed to be fairly quick regardless.
I'm wondering if this difference (clipping off) could be the
culprit? I
don't see the same performance decrease in the AJAX viewer for this
map.
I discussed this with Paul earlier, and think I was supposed to
submit a
bug report, but wasn't able to quickly put together a reproducible
error
report and it slipped my mind (doh!).
Jason
-----Original Message-----
From: Traian Stanev
Subject: RE: [mapguide-users] Polygon labels - fusion problems
I think it could be that Fusion uses a RenderMap API which uses
viewport
clipping turned off (resulting in labels always being at the true
centroid of polygons) while the MG ajax viewer uses
RenderDynamicOverlay, which has viewport clipping turned on, resulting
in polygons being labeled at the centroid of the clipped region.
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Paul Spencer
CTO, DM Solutions Group Inc
http://www.dmsolutions.ca/
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