Is there any way for a basemap to be manipulated from the client side?

Hello,
Essentially, we have a basemap (+basemap A+) that contains boundary geography (i.e., county, tract, block boundaries) and we have a theme (+theme A+) that contains housing unit points.
The idea is that theme A will be a layer that the user will be able to switch on/off. We know how to do this, but the problem comes in where performance is concerned.
Previously, theme A was actually included in basemap A, and performance was not an issue, but the problem then was that the user was not able to turn that layer on/off.
Also I have done everything I know in terms of caching as well as using the mapviewer API
(e.g.,
test_theme.setClickable(false);
test_theme.enableInfoWindow(false);
test_theme.enableInfoTip(false);
test_theme.enableLabels(false);
test_theme.enableAutoWholeImage(true);
test_theme.setMinVisibleZoomLevel(5);),
but rendering the theme on the client side is still way too slow (even at zoom level 5).
So, my question boils down to this. Is there any way for a basemap to be manipulated by a user? I.e., Is there a way for a user to pass parameters to a basemap, essentially telling it which themes to turn on/off?
I know you can specify which zoom level the basemap's themes are visible, but again, we want the user to be able to have control of when a certain theme is shown or not.
Thank you for any help you can provide,
John
Edited by: user641525 on Mar 18, 2009 10:29 AM
Edited by: user641525 on Mar 18, 2009 10:30 AM

What you may try is to replicate your base map but take the point theme out of its definition. Then create a second tile layer for the new base map. You can add both tile layers to the client (but set only one of them to be visible). Then simply switch the tile layers' visibility on/off based on user turning on/off the point theme. The built-in Oracle Maps tutorial #22 (Multiple Base maps) has some sample code you might be able to re-use.
thanks
LJ

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