Set Zoomlevelset Dynamically

Anil1 · March 22, 2016, 7:47am

hey,

I was just wondering if you could set the beginning and end of the zoomlevelset dynamically i.e

say

layer.FeatureLayer.ZoomLevelSet.ZoomLevel01.IsActive=false;

layer.FeatureLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel= ApplyUntilZoomLevel.Level06;

here instead of level01 i want it say level(x) where (x) is dynamic.

is that possible?

by dynamic i mean the value is stored in some constant or a web.config file.

Anil1 · March 22, 2016, 10:47am

say i do something like this

Layer.FeatureLayer.ZoomLevelSet = ThinkGeoMapExtensions.GetZooomLevelSet(5);

then can i set the isactive property??

public static ZoomLevelSet GetZooomLevelSet(int index)

{

return (ZoomLevelSet)Enum.Parse(typeof(ZoomLevelSet), "ZoomLevel" + string.Format("{0:00}", index));

}

Johnny · March 22, 2016, 10:47am

Hi Anil,

ZoomLevelSet is not Enum type, so there maybe some problems when we pass typeof(ZoomLevelSet) to Enum.Parse(Type enumType, String value). You can try the following code to see if it fits your requirement.

public static ZoomLevelSet GetZoomLevelSet(int beginZoomLevel,int endZoomLevel) { ZoomLevelSet zoomLevelSet = new ZoomLevelSet(); switch (beginZoomLevel) { case 1: zoomLevelSet.ZoomLevel01.IsActive = false; ApplyUntilZoomLevelDynamically(zoomLevelSet.ZoomLevel01, endZoomLevel); break; case 2: zoomLevelSet.ZoomLevel02.IsActive = false; ApplyUntilZoomLevelDynamically(zoomLevelSet.ZoomLevel02, endZoomLevel); break; case 3: …………… case 20: zoomLevelSet.ZoomLevel20.IsActive = false; ApplyUntilZoomLevelDynamically(zoomLevelSet.ZoomLevel20, endZoomLevel); break; default: break; } return zoomLevelSet; } private static void ApplyUntilZoomLevelDynamically(ZoomLevel zoomLevel, int endZoomLevel) { switch (endZoomLevel) { case 1: zoomLevel.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level01; break; case 2: zoomLevel.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level02; break; case 3: ……………………… case 20: zoomLevel.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20; break; default: break; } }

Any other questions please let us know.

Thanks,

Johnny

Anil1 · March 22, 2016, 10:47am

hey johnny,

this is an easy way of going about things. this is the first thing that comes to your mind when you want to do something dynamically but it is not the most best way to go about.

the enum way works. we have tried it in our app and it works fine. also to apply the styles to an index dynamically u can have something  like this

public static ZoomLevel GetZoomLevelAtIndex(this ZoomLevelSet zoomLevelSet, int zoomLevelIndex)
         {
             return zoomLevelSet.GetZoomLevels()[zoomLevelIndex - 1];
         }


Layer.ZoomLevelSet.GetZoomLevelAtIndex(_startZoomLevel).ApplyUntilZoomLevel=GetZoomLevelForApplyUntil(_endZoomLevel);

_startZoomLevel& _endZoomLevel are index values in int;

Anil1 · March 22, 2016, 10:47am

on a different note

If i dont want the features to be rendered after a certain zoomlevel how can i achieve this??

Johnny · March 22, 2016, 10:47am

Anil,

Thanks for you ideas, but I still have some issues when compiling the code.

The layer’s rendering bases on the Style, so please don’t set any style for the zoomlevel if you don’t want the features to be rendered after contains zoomevel. For example, if you don’t want them shown between zoomlevel 5 and 6, the code is like below:

Layer.ZoomlevelSet.ZoomLevel05. DefaultLineStyle = LineStyles.LocalRoad;
Layer.ZoomlevelSet.ZoomLevel05.ApplyTo = ZoomlevelSet.ZoomLevel06;
// but don’t set the style for zoomlevels after ZoomLvel06.

Thanks,

Johnny