topic snapping in flex in ArcGIS API for Flex Questions

snapping in flex

NigelDsouza — Wed, 22 Apr 2015 22:06:16 GMT

Hi,

I want to add snapping functionality to my application. The arcgis api for flex states that the snapping mode default is on demand. I have debugged the code and checked, the editor contains all the featurelayers needed to work with. However whenever I try snapping while adding or updating a feature they don't snap. I tried using the default edit widget in the flex viewer but snapping doesn't seem to be working there as well. Can anyone suggest somet

Re: snapping in flex

TomSellsted — Wed, 22 Apr 2015 23:33:19 GMT

Nigel,

Are you holding down the control key as you are hovering over features? The features must also be a feature layer and not a map layer. Otherwise the features are just in a raster image representation instead of an actual vector that can be snapped to.

Regards,

Tom

Re: snapping in flex

NigelDsouza — Thu, 23 Apr 2015 01:58:53 GMT

Hi Tom,

Yup I am holding down the cnrtl key while performing the edit. Also the layers in the edit tool are feature layers as I am able to add,update and delete records . is something go to do with the visibility or feature layer mode or something? Or do I have to explicitly set any properties to the edittool or drawtool on the editor component?

Regards,

Nigel

Re: snapping in flex

TomSellsted — Thu, 23 Apr 2015 15:15:53 GMT

Nigel,

I believe by default snapping is available. You can expressly set snapping parameters for the edit tool or draw tool. Here is an excerpt from the API reference:

snapMode

property

snapMode:String

Since :

ArcGIS API for Flex 2.5

Specifies whether snapping is off, always on or enabled by pressing the Ctrl key.

The default value is SNAP_MODE_ON_DEMAND.

This property can be used as the source for data binding.

Implementation

public function get snapMode():String

public function set snapMode(value:String):void

I put together a measure widget that is a variation of the draw tool. It also has snapping capability. You can view it here:

Yakima CityFlex Viewer - measure widget

Here is a code snippet from my measure widget setting the draw tool snapping parameters:

<esri:DrawTool id="measureDrawTool" map="{map}"

snapDistance="20" snapMode="onDemand" snapOption="vertex"

showDrawTips="{showDrawingTips}"

drawEnd="map_drawEndHandler(event)"

graphicsLayer="{graphicsLayer}"

lineSymbol="{lineSymbol}"

fillSymbol="{fillSymbol}" />

I hope this helps you!

Regards,

Tom