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How to map zoom in level?

Mili

question: the TiledMap have 8 level,but I want only map zoomin 4 level?
How to set?

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JeremyBixby

set the currentLevel property on the AGSMapView object to 4.

mapView.currentLevel = 4;

Mili

set the currentLevel property on the AGSMapView object to 4.
mapView.currentLevel = 4;

SDK:
- (NSInteger) currentLevel [read, assign]
Current level of detail (scale level) displayed by the map.

only read !!!
can't set or write!!

JeremyBixby

Hmm...good point.

Maybe the easiest thing, would be if ESRI would make that property write-able.

Other than that, you could probably work around it by setting the zoom level on the GPS object (if you have enabled GPS on the device):

 [mapView.gps start];
 mapView.gps.autoPan = YES;
 mapView.gps.zoomLevel = 6;

You could probably also do something like this with generic coordinate assignments:

 AGSEnvelope *myEnvelope = [[AGSEnvelope alloc] initWithXmin:2232848.00 ymin:2232843.00 xmax:233167.00 ymax:251425.00 spatialReference:mapView.spatialReference];
 [mapView zoomToEnvelope:myEnvelope animated:YES];
 
 [myEnvelope release];

There are a few other undocumented methods on the AGSMapView object, which will change your zoomLevel...

[mapView setZoomScale:4.0];
 [mapView setZoomScale:4.0 animated:YES];

This screws up your resolution, though.

My guess is, ESRI wants you to set it through the mapview.gps.zoomlevel property. Actually, I would be curious to hear ESRI staff weigh in on this, if for no other reason, to hear some of the philosophy behind the ArcGIS iPhone SDK architecture...

DiveshGoyal

Here's how you could zoom to a scale level -


 int levelToZoomTo = 4;
 AGSLOD* lod = [tiledLayer.mapServiceInfo.tileInfo.lods objectAtIndex:levelToZoomTo];
 float zoomFactor = lod.resolution/self.mapView.resolution;
 AGSMutableEnvelope *newEnv =  
    [AGSMutableEnvelope envelopeWithXmin:self.mapView.envelope.xmin
     ymin:self.mapView.envelope.ymin 
     xmax:self.mapView.envelope.xmax 
     ymax:self.mapView.envelope.ymax
     spatialReference:self.mapView.spatialReference];
            
 [newEnv expandByFactor:zoomFactor];
 [self.mapView zoomToEnvelope:newEnv animated:YES];

KOLDODUARTE

Hi Guys,

I try to zoom in my current location with a custom envelope. I do this envelope with those parameters:

AGSEnvelope *envelopeGPS = [AGSEnvelope envelopeWithXmin:mapView.gps.currentPoint.x    ymin:mapView.gps.currentPoint.y xmax:mapView.gps.currentPoint.x max:mapView.gps.currentPoint.x  spatialReference:self.mapView.spatialReference];  
  
[mapView zoomToEnvelope:envelopeGPS animated:YES];

With this form, the map goes to Africa... it is the center of the map.
I don´t use the autopan property because is too zoom for my base map and I don´t see it.

Best regards,
Koldo.

HarikantJammi

This is what i use , without forming an envelope

[self.mapView centerAtPoint:((AGSPoint *)(graphic.geometry)) animated:YES];
NSArray * lodsArray = self.worldTopoMapService.tileInfo.lods ;
//topomap service is AGSTiledMapServicelayer
AGSLOD * finalLOD = [lodsArray objectAtIndex:5] ;
// 5 is the tile level to zoom to
while (self.mapView.mapScale >= finalLOD.scale) {
[self.mapView zoomIn:YES] ;
}

[self.mapView showCalloutAtPoint:(AGSPoint *) graphic.geometry forGraphic:graphic] ;

KOLDODUARTE

This is what i use , without forming an envelope

[self.mapView centerAtPoint: ((AGSPoint *)(graphic.geometry)) animated:YES];
NSArray * lodsArray = self.worldTopoMapService.tileInfo.lods ;
//topomap service is AGSTiledMapServicelayer
AGSLOD * finalLOD = [lodsArray objectAtIndex:5] ;
// 5 is the tile level to zoom to
while (self.mapView.mapScale >= finalLOD.scale) {
[self.mapView zoomIn:YES] ;
}

[self.mapView showCalloutAtPoint: (AGSPoint *) graphic.geometry forGraphic:graphic] ;

Hi harikant_jammi,

Please, can you tell me what is "self.worldTopoMapService" and "graphic", because I don´t have those objects in my project, thanks!

BR,
Koldo.

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