topic Opacity of Dynamic Map in ArcGIS JavaScript Maps SDK Questions

Opacity of Dynamic Map

VIKRANTKRISHNA — Thu, 04 Apr 2013 14:51:41 GMT

I have a dynamic map with annotation, point, line and polygon layer. One of the polygon layer is set to be 60% transparent ion Map Document. When I load the dynamic map without setting opacity property, the polygon layer does not show its default transparency. And, if I set the opacity for dynamic map , all the layers shows as transparent.

Is there a way to just show layers as its in Map Document?

Re: Opacity of Dynamic Map

StephenLead — Thu, 04 Apr 2013 21:37:28 GMT

You may need to add that map as two separate dynamic layers, and specify the relevant visibleLayers for each dynamic layer.

- create a dynamic layer for the polygon (eg, visibleLayers = [2]) and set its opacity to 0.6
- create a dynamic layer for the points, lines and annotations (eg, visibleLayers = [0,1,3])

Re: Opacity of Dynamic Map

VIKRANTKRISHNA — Fri, 05 Apr 2013 20:35:49 GMT

You may need to add that map as two separate dynamic layers, and specify the relevant visibleLayers for each dynamic layer.

- create a dynamic layer for the polygon (eg, visibleLayers = [2]) and set its opacity to 0.6
- create a dynamic layer for the points, lines and annotations (eg, visibleLayers = [0,1,3])

Then how does arcgis.com does it, when you open a dynamic map service in arcgis.com. It shows a layerlist on the left. That means it loads each layer as a synamic layer spaerately?

Re: Opacity of Dynamic Map

StephenLead — Sat, 06 Apr 2013 00:10:03 GMT

Then how does arcgis.com does it, when you open a dynamic map service in arcgis.com. It shows a layerlist on the left. That means it loads each layer as a synamic layer spaerately?

I think ArcGIS.com creates a single dynamicLayer, which contains multiple layerIds. Each layerId is shown as an item in the layer list.

What happens if you add your layer to ArcGIS.com - does the polygon correctly show with 60% transparency?

Re: Opacity of Dynamic Map

VIKRANTKRISHNA — Mon, 08 Apr 2013 13:14:45 GMT

I think ArcGIS.com creates a single dynamicLayer, which contains multiple layerIds. Each layerId is shown as an item in the layer list.

What happens if you add your layer to ArcGIS.com - does the polygon correctly show with 60% transparency?

Yes, if I add dynamic map to arcgis.com, it shows polygon layer with correct transparency. I guess its loading each layer as separate dynamic map layer.