VEGA - Formatting of links between nodes

[DW868990]

Hi,
I have created a tree visualisation in VEGA within the deneb visual, and i am just looking for a little bit of VEGA help as i am currently on the learning curve of from Vega-Lite to Vega.

Now basically what i am trying to achieve is to format the color or the dash of the links between nodes based on a field in my data, the field is called relationship.
For example when the relationship field is X, i need the link between nodes to either be dashed or red. 

The snippet of VEGA below is the path mark that i used to create the links between nodes.

{
"type": "path",
"from": {"data": "links"},
"encode": {
"update": {
"path": {"field": "path"},
"stroke": {"value": "#ccc"}
}
}
},


Any help is very much appreciated.

@giammariam not sure if this is something you could lend any advice to, TIA.

 

 

[v-jianpeng-msft · Accepted solution]

Hi, @DW868990 

Maybe you can try the following VEGA code:

{
  "type": "path",
  "from": {"data": "links"},
  "encode": {
    "update": {
      "path": {"field": "path"},
      "stroke": {
        "condition": [
          {"test": "datum.relationship == 'X'", "value": "red"},
          {"test": "datum.relationship == 'Y'", "value": "blue"} // Example for another condition
        ],
        "value": "#ccc" // Default color
      },
      "strokeDash": {
        "condition": [
          {"test": "datum.relationship == 'X'", "value": [5, 5]} // Example for dashed line
        ],
        "value": null // Default to solid line
      }
    }
  }
}

 It is recommended that you read the official VEGA tutorial:

Tutorials | Vega

As you learn VEGA, we recommend that you read up on other excellent VEGA code:

Vega Data Visualization Examples - Power of Business Intelligence (powerofbi.org)

Explore examples and get inspired | Observable (observablehq.com)

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Jianpeng Li

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