I don't have a true base map in my application. The service used by the Overview map has a upper scale threshold of 1:100,000. However once my map goes beyond a scale of 1:8100 I no longer get anything in my overview. I got a value of 8100 by making my map perfectly square. On a more rectangular map it disappears at around 1:6000.
The documentation would suggest that the overview should be showing the map at 1:24300 (8100 x 3) in which case the I should still see the map service.
If the documentation meant 3 zoom levels then it would still be visible, showing 1:64800 (8100 x 2 x 2 x 2).
Am I misreading the documentation? Is the documentation just wrong? Or is something odd with my application/map service?
I don't have a true base map in my application. The service used by the Overview map has a upper scale threshold of 1:100,000. However once my map goes beyond a scale of 1:8100 I no longer get anything in my overview. I got a value of 8100 by making my map perfectly square. On a more rectangular map it disappears at around 1:6000.
The documentation would suggest that the overview should be showing the map at 1:24300 (8100 x 3) in which case the I should still see the map service.
If the documentation meant 3 zoom levels then it would still be visible, showing 1:64800 (8100 x 2 x 2 x 2).
Am I misreading the documentation? Is the documentation just wrong? Or is something odd with my application/map service?
In the code it looks like this:
private function updateOverviewExtentFromMap():void { overviewMap.extent = map.extent.expand(3); overviewGraphic.geometry = map.visibleArea; //hide overview box if larger than overview map overviewGraphic.visible = overviewMap.extent.contains(overviewGraphic.geometry); }
where the expand function is described as: "Returns a new expanded extent. For example, a value of 1.5 will create an extent that is 50% bigger."
I don't have a true base map in my application. The service used by the Overview map has a upper scale threshold of 1:100,000. However once my map goes beyond a scale of 1:8100 I no longer get anything in my overview. I got a value of 8100 by making my map perfectly square. On a more rectangular map it disappears at around 1:6000.
The documentation would suggest that the overview should be showing the map at 1:24300 (8100 x 3) in which case the I should still see the map service.
If the documentation meant 3 zoom levels then it would still be visible, showing 1:64800 (8100 x 2 x 2 x 2).
Am I misreading the documentation? Is the documentation just wrong? Or is something odd with my application/map service?
In the code it looks like this:
private function updateOverviewExtentFromMap():void { overviewMap.extent = map.extent.expand(3); overviewGraphic.geometry = map.visibleArea; //hide overview box if larger than overview map overviewGraphic.visible = overviewMap.extent.contains(overviewGraphic.geometry); }
where the expand function is described as: "Returns a new expanded extent. For example, a value of 1.5 will create an extent that is 50% bigger."
