topic Re: ZoomOut problem in ArcGIS API for Silverlight Questions

ZoomOut problem

MaximSpikin — Thu, 23 Dec 2010 06:31:10 GMT

Hi,

ArcGIS Server 10
Silverlight API 2.1

Create Map and add Tiled Layers
ZoomIn ZoomOut work fine, but when i change SnapToLevels = true
ZoomOut with ? mouse whell and a "-" button doesn't work
Image twitches, but doesn't change scale

Re: ZoomOut problem

DominiqueBroux — Thu, 23 Dec 2010 12:42:31 GMT

Please check what are the level of details of your tiled layer.
Example : http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer

Re: ZoomOut problem

MaximSpikin — Thu, 23 Dec 2010 13:37:48 GMT

Levels of Detail: (# Levels: 5)
Level ID: 0 [Start Tile, End Tile]
Resolution: 79,3751587503175
Scale: 300000
Level ID: 1 [Start Tile, End Tile]
Resolution: 26,4583862501058
Scale: 100000
Level ID: 2 [Start Tile, End Tile]
Resolution: 6,61459656252646
Scale: 25000
Level ID: 3 [Start Tile, End Tile]
Resolution: 1,32291931250529
Scale: 5000
Level ID: 4 [Start Tile, End Tile]
Resolution: 0,132291931250529
Scale: 500

What next?

Re: ZoomOut problem

DominiqueBroux — Thu, 23 Dec 2010 13:51:51 GMT

Your minimum scale is 1:300000 (which is relatively high) so you will never be able to zoom out more than this scale.

After zooming in using the wheel or +, can you zoom out back or are all zoom out impossible whatever the initial state?

Re: ZoomOut problem

MaximSpikin — Thu, 23 Dec 2010 14:33:05 GMT

After zooming in using the wheel or +, I doesn't zoom out back
but if i use ZoomToResolution(6,61459656252646) i get zoom 300 000

and "-" button in Navigation Control - doesn't change scale

Re: ZoomOut problem

DominiqueBroux — Thu, 23 Dec 2010 14:40:50 GMT

:confused:
Can you zoom out by using the navigation control?
Can you reproduce the issue with a public tiled map service or is it specific to your service?

Re: ZoomOut problem

MaximSpikin — Thu, 23 Dec 2010 14:53:45 GMT

:confused:
Can you zoom out by using the navigation control?
Can you reproduce the issue with a public tiled map service or is it specific to your service?

1. No, If I once ZoomIn, I can't scale back in any way - mouse wheel, "-" and "-" Navigation control
example
load map zoom - 300 000
mouse wheel zoom in - 100 000
mouse wheel zoom out - or press "-" or click "-" Navigation control - NOTHING Zoom = 100 000
mouse wheel zoom in - 25 000
mouse wheel zoom out - or press "-" or click "-" Navigation control - NOTHING Zoom = 25 000

2. i will try

Re: ZoomOut problem

MaximSpikin — Thu, 13 Jan 2011 07:38:48 GMT

Hi,
my problem has not been solved yet.

I will explain one more time:
1) I create a map, add a tiled cached layer,
    everything works perfectly - zooming in and zooming out
2) I activate SnapToLevels,
    ZoomIn to the next scale (for example, from 300 000 to 100 000),
    but I cannot zoom out back (from 100 000 to 300 000),
    the map is jerking like in repainting, but does not go back to the initial scale.

What should I do?
Could you give me some piece of advice?

Re: ZoomOut problem

DominiqueBroux — Thu, 13 Jan 2011 15:54:17 GMT

For the moment, I am in lack of idea:(.

You have never answered to my question : 'Can you reproduce the issue with a public tiled map service or is it specific to your service? '

Re: ZoomOut problem

MaximSpikin — Fri, 04 Feb 2011 04:26:38 GMT

Problem solved!
Everything turned out to be much easier -
In the Level of Detail every successive scale
should be two times begger or smaller than the current scale.

Example
Scale: 250 000
Scale: 100 000
Scale: 50 000
Scale: 25 000