topic Re: Apply color scale to shapefile points in Qt Maps SDK Questions

Apply color scale to shapefile points

HomeroOriaAguilera — Wed, 27 Apr 2022 02:41:36 GMT

It's possible to apply multiple colors to shapefile points with Runtime SDK QML?

I have a shapefile composed of points, each point has an attribute [HEIGTH] that is a number. The idea is to colorize each point based on a range of color scales. For example, if my point's height is 500 m, the point it's going to render blue (400 - 600 m), however, if my point has 800 m, the color render should be green (700 - 900 m). There are about 5 ranges with their own color and about 100 000 pts.

To accomplish this, I create a ShapefileFeatureTable, QueryParameters, UniqueRenderValue, etc.

For example, to do the query I establish the whereClause:

queryParams.whereClause= "HEIGHT>400 OR HEIGHT<600"

1. How do I chain multiple queries to render each point with their respective color?

2. Which is the best strategy to set the UniqueValueRender in this context?

Re: Apply color scale to shapefile points

LucasDanzinger — Wed, 27 Apr 2022 14:16:46 GMT

Hello,

You should consider using ClassBreaksRenderer instead of UniqueValueRenderer. This allows you to define class ranges of values vs individual unique values.

The API Reference has a code example of how to create the ClassBreaksRenderer and set it on your FeatureLayer

https://developers.arcgis.com/qt/qml/api-reference/qml-esri-arcgisruntime-classbreaksrenderer.html

Re: Apply color scale to shapefile points

HomeroOriaAguilera — Mon, 02 May 2022 14:28:01 GMT

Thanks @Luka !!! That's the solution I am looking for!