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On the localhost page launched to use Neo4j, it is easy to color specific nodes in a different way. Following the movie example included in Neo4j; persons in red, movies in purple and with a click of the button change one to orange.

As an expansion on this, I would like to color nodes of the same type, but with a different property in a different way. Following the example; add gender as a property to each person node, followed by coloring men blue and women red.

Is it possible to realize this in the current build? I am working with Neo4j Community 2.1.7.

Edit: There was a request for an piece of the .grass file responsible for the visualization. Here is a small excerpt responsible for coloring a type of node.

node.Page {
  color: #30B6AF;
  border-color: #46A39E;
  text-color-internal: #FFFFFF;
  diameter: 80px;
  border-width: 2px;
  caption: '{pagename}';
  font-size: 10px;}
Michiel van Zummeren
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  • Is it possible to extract the click-and-color source code out of the movie example and show it as part of your question? – xmojmr Mar 05 '15 at 06:19
  • For the visual representation it uses a .grass file, of which I can't seem to find a lot of information. Additionally, it is not possible to edit it in the browser. I put a piece of the .grass file in the first post (to keep it readable). I'll give it a shot by editing it in a .txt file, saving as .grass and uploading it. – Michiel van Zummeren Mar 09 '15 at 12:42

3 Answers3

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Even though I am a bit late here want to help others who might be finding a way. It is not possible to change the color of the nodes based on the property but there is a way it can be achieved by creating nodes based on the property. Keep in mind that after applying these queries your data wont be the same. So it is always a good idea to keep a backup of your data.

This is how labels are colored by default (Before):

enter image description here

Color based on the property

Suppose there is a label called Case with a property nationality and you want to color the nodes based on nationality. So following query could be used to create labels out of nationality property. For this you will need to install apoc library. check here for installation.

// BY NATIONALITY
MATCH (n:Case)
WITH DISTINCT n.nationality AS nationality, collect(DISTINCT n) AS persons
CALL apoc.create.addLabels(persons, [apoc.text.upperCamelCase(nationality)]) YIELD node
RETURN *

This will return all the people by nationality. Now you can color by country of nationality. Below shows an example.

enter image description here

Color based on the property and load with other labels

Lets say you also have a label called Cluster.The cases are attached to clusters via relationships. Just change the query to following to get the clusters with their relationships to cases.

//BY NATIONALITY WITH CLUSTERS
MATCH (n:Case),(c:Cluster)
WITH DISTINCT n.nationality AS nationality, 
    collect(DISTINCT n) AS persons,
    collect(DISTINCT c) AS clusters
CALL apoc.create.addLabels(persons, [apoc.text.upperCamelCase(nationality)]) YIELD node
RETURN *

It will return cases and clusters with all the relationships. Below shows example.

enter image description here

Please leave an up vote if this was helpful and want to let others know that this is an acceptable answer. Thank you.

aimme
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  • Can you please look into below post: https://stackoverflow.com/questions/72433368/issue-in-cypher-query-org-neo4j-internal-kernel-api-exceptions-entitynotfounde – Carpe Diem May 30 '22 at 15:46
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I'm pretty sure this is not possible. If you click on the "Style" tab of the pop-up and click on "View stylesheet" you'll see in the GRASS file that the colors are tied to node labels. If you want a different sort of visualization, you could submit a pull request:

https://github.com/neo4j/neo4j/tree/master/community/browser

It's important to note that the GRASS format was created for Neo4j and, as far as I know, isn't used anywhere else, so don't look for standards documentation anywhere.

Alternatively, depending on what you're doing, you could create your own visualization. For the web there are a number of libraries like Sigma.js or D3. I've also been wanting to play with this one (based on Sigma.js), but haven't gotten a chance yet:

https://github.com/Linkurious/linkurious.js

Brian Underwood
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  • Thanks for the response! I might have a look at the libraries mentioned if I have the time for it, but the first priorities are developing a GUI and getting the results from queries visualized. – Michiel van Zummeren Mar 06 '15 at 08:59
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I have found a workaround - virtual subgraph. Based on the APOC page:

"you can create visual representation of data that are not in the graph"

Basically you can create virtual copy of nodes using apoc.create.vNode and assign different types to those virtual nodes based on the property value. In your case there would be two new types of nodes men and women. Then you are free to assign different colour/style to the 'men' nodes and 'women' nodes.

Your code should be something like:

UNWIND ['men', 'women'] as gender 
MATCH (n:Person {Gender:gender}) 
CALL apoc.create.vNode([gender],{id:n.id}) yield node as vPerson 
RETURN vPerson

if you want to show the relationships (between same sex), comment out the last line above and add the following query:

WITH apoc.map.groupBy(collect(vPerson),'id') as vPersons, gender 
WITH vPersons, [(p1:Person {Gender:gender})-[r]->(p2:Person {Gender:gender}) | apoc.create.vRelationship(vPersons[p1.id], type(r), {}, vPersons[p2.id])] as rels 
RETURN vPersons, rels
lgao
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