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How do I resize symbols from a 2525 dictionary renderer?

troyfoster

I finally got my runtime qt app converted over from 100.4 to 100.11. I remember from one of the devsummit briefs that 2525 dictionary symbols were able to be resized in a later release. Is there a sample or code snippet displaying how to resize those dictionary symbols?

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Accepted answers

LucasDanzinger

There is no sample at the moment. Here is the doc - https://developers.arcgis.com/qt/cpp/api-reference/esri-arcgisruntime-dictionaryrenderer.html#setScaleExpression

Here is an example we have in our tests:

// Simple case... double the size 
ArcadeExpression* arcadeExpression = new ArcadeExpression("2", this);
dictionaryRenderer->setScaleExpression(arcadeExpression);

// More advanced case... double the size if the identity_code attribute is 4
ArcadeExpression* arcadeExpression = new ArcadeExpression("iif($feature.Identity_code == 4, 2,1)", this);
dictionaryRenderer->setScaleExpression(arcadeExpression);

Here is an Arcade reference you can use to write your expressions - https://developers.arcgis.com/arcade/

All comments

LucasDanzinger

There is no sample at the moment. Here is the doc - https://developers.arcgis.com/qt/cpp/api-reference/esri-arcgisruntime-dictionaryrenderer.html#setScaleExpression

Here is an example we have in our tests:

// Simple case... double the size 
ArcadeExpression* arcadeExpression = new ArcadeExpression("2", this);
dictionaryRenderer->setScaleExpression(arcadeExpression);

// More advanced case... double the size if the identity_code attribute is 4
ArcadeExpression* arcadeExpression = new ArcadeExpression("iif($feature.Identity_code == 4, 2,1)", this);
dictionaryRenderer->setScaleExpression(arcadeExpression);

Here is an Arcade reference you can use to write your expressions - https://developers.arcgis.com/arcade/

KerryRobinson

Hi Troy. Yes, as Lucas mentioned, there is a new `scaleExpression` method on the Dictionary Renderer that can accept either a constant or an Arcade expression. So it doesn't set your symbol to a specific size, but you can scale all symbols based on a specific value, or use the expression to scale based on an attribute, map scale, etc.

troyfoster

That just cleaned up about 130 lines of janky workaround to resize the symbols

VittorioBarulli

I'm using ArcGis 100.15(Qt) but I'm not able to use 'scaleExpression",

to be clearer:

I'm able to put on the map graphical elements from dictionarySymbolStyle(created with mil2525d.stylx),
Symbols generated from dictionarySymbolStyle are rendered inside a GraphicsOverlay by using a Graphic object
the GraphicsOverlay object is rendered (setRenderer) with DictionaryRenderer create with dictionarySymbolStyle (at point 1)

But if I try to use:

ArcadeExpression* arcadeExpression = new ArcadeExpression("2", this);
renderer->setScaleExpression(arcadeExpression);

nothing happens on the screen, the symbol is always drawn with default dimension.

I tryed to setScaleExpression during initialization and during runtime, but also the same result!

Do you have some advice?

VittorioBarulli

It' funny,

I found the solution just after my question.
The issue was that I used fetchSymbol to create the symbol inside the Graphics.
Instead, the correct way is to fill attribute() of the Graphics with proper properties.

KerryRobinson

Hi- If you don't need to set the scale based on an attribute value, you can also just use a constant value for setScaleExpression, like this:

renderer->setScaleExpression(2);

Otherwise, yes, you can set the attribute of the graphic and use that in an arcade expression to set the scale.

Kerry

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