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LayerDrawingOptions Font Size Set Same As Server Default But Renders Smaller

RyanCoodey

I am building a dialog to allow the users to change a layers labeling scale, all other LayerDrawingOptions should stay at the defaults. Unfortnatly from what I can tell, there is no way to just change the label's min/max scale without also defining most the other LayerDrawingOptions. Found I could skip resetting the renderer (leave it null) if I also dont reset "Opacity".

First question, is there any easy way to just change the label min/max without having to specify all the other properties?

Since there is not a nice method like CreateDynamicLayerInfosFromLayerInfos() for LayerDrawingOptions I am retrieving all the layer info manually from the servers (JSON).

Second question, is there a built in way to get this info I am not seeing?

I am taking this info to build out a complete LayerDrawingOptions with the defaults from the server, but the Font Size (even though set to the same font settings as the server) gets smaller.

Third question, and most important, is this a bug? Why is it not rendering the same size?

Thanks a lot for any help or info!

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Runtime SDK for WPF

Accepted answers

DominiqueBroux

First question, is there any easy way to just change the label min/max without having to specify all the other properties?

You have to set all the labels properties but not all the renderer properties.
For example the following code is working with the renderer defined at server side:

<esri:Map>     <esri:ArcGISDynamicMapServiceLayer Url="http://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer">         <esri:ArcGISDynamicMapServiceLayer.LayerDrawingOptions>             <esri:LayerDrawingOptionsCollection>                 <esri:LayerDrawingOptions LayerID="2" ShowLabels="True">                     <esri:LayerDrawingOptions.LabelClasses>                         <esri:LabelClassCollection>                             <esri:LabelClass LabelExpression="[state_abbr]" MaxScale="15000000">                                 <esri:LabelClass.LabelOptions>                                     <esri:LabelOptions FontSize="20" Color="Green" />                                 </esri:LabelClass.LabelOptions>                             </esri:LabelClass>                             <esri:LabelClass LabelExpression="[state_name] CONCAT NEWLINE CONCAT &quot;Pop2000:&quot; CONCAT [pop2000]" MinScale="15000000">                                 <esri:LabelClass.LabelOptions>                                     <esri:LabelOptions FontSize="15" Color="Green" />                                 </esri:LabelClass.LabelOptions>                             </esri:LabelClass>                         </esri:LabelClassCollection>                     </esri:LayerDrawingOptions.LabelClasses>                </esri:LayerDrawingOptions>             </esri:LayerDrawingOptionsCollection>         </esri:ArcGISDynamicMapServiceLayer.LayerDrawingOptions>         <esri:ArcGISDynamicMapServiceLayer.DynamicLayerInfos>             <esri:DynamicLayerInfoCollection>                 <esri:DynamicLayerInfo ID="2">                     <esri:DynamicLayerInfo.Source>                         <esri:LayerMapSource MapLayerID="2" />                     </esri:DynamicLayerInfo.Source>                 </esri:DynamicLayerInfo>             </esri:DynamicLayerInfoCollection>         </esri:ArcGISDynamicMapServiceLayer.DynamicLayerInfos>     </esri:ArcGISDynamicMapServiceLayer> </esri:Map>

Since there is not a nice method like CreateDynamicLayerInfosFromLayerInfos() for LayerDrawingOptions I am retrieving all the layer info manually from the servers (JSON).

Second question, is there a built in way to get this info I am not seeing?

You are right there is no builtin method to create a default layerDrawingOptions nevertheless you can use the GetAllDetails method to get renderers defined at server side and use them to build a LayerDrawingOptions object.

I am taking this info to build out a complete LayerDrawingOptions with the defaults from the server, but the Font Size (even though set to the same font settings as the server) gets smaller.

Third question, and most important, is this a bug? Why is it not rendering the same size?

I am not sure but might be a difference due to points vs pixels. try by multiplying by a ratio 96/72.

All comments

SaranPon

OK... I just applied the MinScale value and see that it is performing better (it takes longer than EnableDynamicLayers=false option).. however at least now it is working... for the purpose of someone who is in need to fully working code, here it is.

Thank you Dominique.... Appreciate your help.

Regards,
Saran

<esri:Map>
            <esri:ArcGISLocalDynamicMapServiceLayer Path="States.mpk" >
                <esri:ArcGISLocalDynamicMapServiceLayer.LayerDrawingOptions>
                    <esri:LayerDrawingOptionsCollection>
                        <esri:LayerDrawingOptions LayerID="0" ShowLabels="True">
                            <esri:LayerDrawingOptions.LabelClasses>
                                <esri:LabelClassCollection>
                                    <!--<esri:LabelClass LabelExpression="[NAME1]" >
                                        <esri:LabelClass.LabelOptions>
                                            <esri:LabelOptions FontSize="10" Color="Red" />
                                        </esri:LabelClass.LabelOptions>
                                    </esri:LabelClass>-->
                                    <esri:LabelClass LabelExpression="[NAME1]" MinScale="15000000">
                                        <esri:LabelClass.LabelOptions>
                                            <esri:LabelOptions FontSize="15" Color="Green" />
                                        </esri:LabelClass.LabelOptions>
                                    </esri:LabelClass>
                               </esri:LabelClassCollection>
                            </esri:LayerDrawingOptions.LabelClasses>
                        </esri:LayerDrawingOptions>
                    </esri:LayerDrawingOptionsCollection>
                </esri:ArcGISLocalDynamicMapServiceLayer.LayerDrawingOptions>
                <esri:ArcGISLocalDynamicMapServiceLayer.DynamicLayerInfos>
                    <esri:DynamicLayerInfoCollection>
                        <esri:DynamicLayerInfo ID="0">
                            <esri:DynamicLayerInfo.Source>
                                <esri:LayerMapSource MapLayerID="0" />
                            </esri:DynamicLayerInfo.Source>
                        </esri:DynamicLayerInfo>
                    </esri:DynamicLayerInfoCollection>
                </esri:ArcGISLocalDynamicMapServiceLayer.DynamicLayerInfos>
            </esri:ArcGISLocalDynamicMapServiceLayer>
        </esri:Map>

SaranPon

Thanks. I see the reason now.... But why it is taking longer to draw the layer?... almost it took more than 2 minutes to render...

Regards,
Saran

DominiqueBroux

But at the same I couldn't see all the labels displayed for every state.... something weird happening... Is it related to environment?

The labelling engine hides labels if there is not enough place to display them without overlap.
The labels should show up if you zoom in though.

SaranPon

Hi,
Thank you for the quick findings...

Regarding your points

1) Yes, I did recreate the package with the name States1.mpk so no surprise here...
2) LayerID... this was the key...I tried with 0 earlier and 1, 2... I thought I didn't get any output if I use 0 however just now discovered that infact it takes longer to get the output... not sure why it takes longer to render... finally I got the output but in a way I need...

But at the same I couldn't see all the labels displayed for every state.... something weird happening... Is it related to environment?

I'm on Windows 2003 OS on a VM...

Note: I changed the field to [NAME2] so you are getting the abbr state names in the attached image...

[ATTACH=CONFIG]32565[/ATTACH]

state.JPG

DominiqueBroux

I am able to display labels with your mpk file. See screenshot:

[ATTACH=CONFIG]32562[/ATTACH]

However, I have had to do 2 changes that could explain your issue:
- filename is States1.mpk and not States.mpk
- the map layer id is 0 and not 1 (MapLayerID="1" --> MapLayerID="0")

dynamiclabelling.png

SaranPon

Hi,

Please find attached...

Thanks,
Saravanan

States1.mpk.zip

DominiqueBroux

Dominique,

I verified that I have a column named [NAME1] available... also tried to use the text as suggested.... nothing worked.

If you could share your file States.mpk, I would take a look.

SaranPon

Dominique,

Thanks. However after setting the EnableDynamicLayers="True" option, there is no map produced.... output is blank...

 <esri:Map>
            <esri:ArcGISLocalDynamicMapServiceLayer Path="W:\Inforum Platform_Dev\Mapviewer\ESRIShapeFiles\Boundary\States.mpk"  EnableDynamicLayers="True">
                <esri:ArcGISLocalDynamicMapServiceLayer.LayerDrawingOptions>
                    <esri:LayerDrawingOptionsCollection>
                        <esri:LayerDrawingOptions LayerID="1" ShowLabels="True">
                            <esri:LayerDrawingOptions.LabelClasses>
                                <esri:LabelClassCollection>
                                    <esri:LabelClass LabelExpression="[NAME1]" MaxScale="15000000">
                                        <esri:LabelClass.LabelOptions>
                                            <esri:LabelOptions FontSize="20" Color="Green" />
                                        </esri:LabelClass.LabelOptions>
                                    </esri:LabelClass>
                                    <esri:LabelClass LabelExpression="[NAME1]" MinScale="15000000">
                                        <esri:LabelClass.LabelOptions>
                                            <esri:LabelOptions FontSize="15" Color="Green" />
                                        </esri:LabelClass.LabelOptions>
                                    </esri:LabelClass>
                                </esri:LabelClassCollection>
                            </esri:LayerDrawingOptions.LabelClasses>
                        </esri:LayerDrawingOptions>
                    </esri:LayerDrawingOptionsCollection>
                </esri:ArcGISLocalDynamicMapServiceLayer.LayerDrawingOptions>
                <esri:ArcGISLocalDynamicMapServiceLayer.DynamicLayerInfos>
                    <esri:DynamicLayerInfoCollection>
                        <esri:DynamicLayerInfo ID="1">
                            <esri:DynamicLayerInfo.Source>
                                <esri:LayerMapSource MapLayerID="1" />
                            </esri:DynamicLayerInfo.Source>
                        </esri:DynamicLayerInfo>
                    </esri:DynamicLayerInfoCollection>
                </esri:ArcGISLocalDynamicMapServiceLayer.DynamicLayerInfos>
            </esri:ArcGISLocalDynamicMapServiceLayer>
        </esri:Map>

I verified that I have a column named [NAME1] available... also tried to use the text as suggested.... nothing worked.

Any help will be appreciated... Thanks.

regards,
Saran

DominiqueBroux

You have to set EnableDynamicLayers to true in order to be able to change the renderer or the labelling of local dynamic layers.

<esri:ArcGISLocalDynamicMapServiceLayer Path="States.mpk" EnableDynamicLayers="True">
.....

Then make sure that the field NAME1 does exist:

<esri:LabelClass LabelExpression="[NAME1]" >

else the labelling won't work.
For testing purpose, you can set an hardcoded expression not depending on field names such as:

<esri:LabelClass LabelExpression="&quot;TEST&quot;" >

SaranPon

Hi,

I have a similar requirement to update Labels using a local dynamic layer (only one layer in the package).

I tried the following as suggested

 <esri:Map>
            <esri:ArcGISLocalDynamicMapServiceLayer Path="States.mpk">
                <esri:ArcGISLocalDynamicMapServiceLayer.LayerDrawingOptions>
                    <esri:LayerDrawingOptionsCollection>
                        <esri:LayerDrawingOptions LayerID="0" ShowLabels="True">
                            <esri:LayerDrawingOptions.LabelClasses>
                                <esri:LabelClassCollection>
                                    <esri:LabelClass LabelExpression="[NAME1]" MaxScale="15000000">
                                        <esri:LabelClass.LabelOptions>
                                            <esri:LabelOptions FontSize="20" Color="Green" />
                                        </esri:LabelClass.LabelOptions>
                                    </esri:LabelClass>
                                    <esri:LabelClass LabelExpression="[NAME1]" MinScale="15000000">
                                        <esri:LabelClass.LabelOptions>
                                            <esri:LabelOptions FontSize="15" Color="Green" />
                                        </esri:LabelClass.LabelOptions>
                                    </esri:LabelClass>
                                </esri:LabelClassCollection>
                            </esri:LayerDrawingOptions.LabelClasses>
                        </esri:LayerDrawingOptions>
                    </esri:LayerDrawingOptionsCollection>
                </esri:ArcGISLocalDynamicMapServiceLayer.LayerDrawingOptions>
                <esri:ArcGISLocalDynamicMapServiceLayer.DynamicLayerInfos>
                    <esri:DynamicLayerInfoCollection>
                        <esri:DynamicLayerInfo ID="0">
                            <esri:DynamicLayerInfo.Source>
                                <esri:LayerMapSource MapLayerID="0" />
                            </esri:DynamicLayerInfo.Source>
                        </esri:DynamicLayerInfo>
                    </esri:DynamicLayerInfoCollection>
                </esri:ArcGISLocalDynamicMapServiceLayer.DynamicLayerInfos>
            </esri:ArcGISLocalDynamicMapServiceLayer>
        </esri:Map>

Am I doing anything wrong here? Can someone help?

Thanks,
Saran

RyanCoodey

Great, thanks once again Dominique for the information!

DominiqueBroux

So 96 is the screen DPI (which I can have C# get the current users default in case this is not), but may I ask what the 72 is?

By definition in typography a point is 1/72 of an inch. So we can set a constant with this value.

Now the labels almost match the same as the defaults, the only other thing that seems to be happening is the labels (in this case for a line) shift away from the line more than the defaults do. Setting the LabelClass.LabelPlacement like so:
labelClass.LabelPlacement = (LabelPlacement)Enum.Parse(typeof(LabelPlacement), currentJSONLabelingInfo.labelPlacement.Replace("esriServer", "")); //Convert esriServerLinePlacementAboveAlong to LinePlacementAboveAlong
And there are no offsets or anything. Not a huge issue... but not sure why they are shifting a bit if you happen to know? Attached an image for clarification.

Sorry no idea.

Thanks again for all the great help! If Dominique�??s boss is reading this, please give him a raise .

Thanks I'll definitively remind him when the time comes 😮

RyanCoodey

Dominique to the rescue again! Thanks a lot.

Thanks for confirming. Would be a nice future enhancement request... maybe something along the lines of all the properties can be nullable and if null then server defaults are used. Not sure what is required on the server side though, so probably not be quite that simple. We�??ll survive without that feature though .
Thanks for confirming. Would be a nice future enhancement request to get default LayerDrawingOptions out of the box, but no hurries from me on a feature like that, pretty easy to implement for oneself.
Thanks much, that was the problem... scaling by 96/72 worked! A few additional questions if I may:

So 96 is the screen DPI (which I can have C# get the current users default in case this is not), but may I ask what the 72 is?
Now the labels almost match the same as the defaults, the only other thing that seems to be happening is the labels (in this case for a line) shift away from the line more than the defaults do. Setting the LabelClass.LabelPlacement like so:

Thanks again for all the great help! If Dominique�??s boss is reading this, please give him a raise

LayerDrawingOptionsLabelShift.png

DominiqueBroux

First question, is there any easy way to just change the label min/max without having to specify all the other properties?

You have to set all the labels properties but not all the renderer properties.
For example the following code is working with the renderer defined at server side:

<esri:Map>     <esri:ArcGISDynamicMapServiceLayer Url="http://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer">         <esri:ArcGISDynamicMapServiceLayer.LayerDrawingOptions>             <esri:LayerDrawingOptionsCollection>                 <esri:LayerDrawingOptions LayerID="2" ShowLabels="True">                     <esri:LayerDrawingOptions.LabelClasses>                         <esri:LabelClassCollection>                             <esri:LabelClass LabelExpression="[state_abbr]" MaxScale="15000000">                                 <esri:LabelClass.LabelOptions>                                     <esri:LabelOptions FontSize="20" Color="Green" />                                 </esri:LabelClass.LabelOptions>                             </esri:LabelClass>                             <esri:LabelClass LabelExpression="[state_name] CONCAT NEWLINE CONCAT &quot;Pop2000:&quot; CONCAT [pop2000]" MinScale="15000000">                                 <esri:LabelClass.LabelOptions>                                     <esri:LabelOptions FontSize="15" Color="Green" />                                 </esri:LabelClass.LabelOptions>                             </esri:LabelClass>                         </esri:LabelClassCollection>                     </esri:LayerDrawingOptions.LabelClasses>                </esri:LayerDrawingOptions>             </esri:LayerDrawingOptionsCollection>         </esri:ArcGISDynamicMapServiceLayer.LayerDrawingOptions>         <esri:ArcGISDynamicMapServiceLayer.DynamicLayerInfos>             <esri:DynamicLayerInfoCollection>                 <esri:DynamicLayerInfo ID="2">                     <esri:DynamicLayerInfo.Source>                         <esri:LayerMapSource MapLayerID="2" />                     </esri:DynamicLayerInfo.Source>                 </esri:DynamicLayerInfo>             </esri:DynamicLayerInfoCollection>         </esri:ArcGISDynamicMapServiceLayer.DynamicLayerInfos>     </esri:ArcGISDynamicMapServiceLayer> </esri:Map>

Since there is not a nice method like CreateDynamicLayerInfosFromLayerInfos() for LayerDrawingOptions I am retrieving all the layer info manually from the servers (JSON).

Second question, is there a built in way to get this info I am not seeing?

I am taking this info to build out a complete LayerDrawingOptions with the defaults from the server, but the Font Size (even though set to the same font settings as the server) gets smaller.

Third question, and most important, is this a bug? Why is it not rendering the same size?

I am not sure but might be a difference due to points vs pixels. try by multiplying by a ratio 96/72.

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