topic Re: Keeping consistent scale on monitors in ArcGIS JavaScript Maps SDK Questions

Keeping consistent scale on monitors

EvonFranklin — Mon, 22 May 2017 15:05:40 GMT

When I use different size monitors then try to `MapView.goTo(extent)`, it zooms in more or less depending on screen size. On larger resolution screens it zooms in a bit more than smaller ones, is there a way to set just how much zoom happens when I try to go to a feature?

Re: Keeping consistent scale on monitors

MirHashmi — Wed, 24 May 2017 07:41:10 GMT

Hi Evon,

You can achieve zooming to a particular level of your map by passing the zoom value to the same function as an option. The same function "MapView.goTo" accepts a second parameter as "Options" wherein one can define the zoom level.

For more information on these functions click here and here.

Thanks.

Re: Keeping consistent scale on monitors

EvonFranklin — Wed, 24 May 2017 14:07:04 GMT

goTo does accept additional parameters but it does not allow for zoom level, so I guess I am stuck again.

Re: Keeping consistent scale on monitors

KenBuja — Wed, 24 May 2017 19:14:21 GMT

This is caused by using the tiled basemaps. They are set to show at a specific resolution or scale for each Level of Detail (LOD) and at a specific DPI. Since the resolution and the DPI of the monitors vary, this means the extent of the basemap will not be exactly the same on different monitors.

Re: Keeping consistent scale on monitors

HemingZhu — Wed, 24 May 2017 19:29:13 GMT

you could do like this:

mapView.constraints = {
minScale: 295828763.795777, // the second lowest tile level -1
maxScale: 564.248588 // the hightest tile level -20
};