The logic of how vertices(nodes) and edges(links) are drawn in Graph Visual is rather simple. The Graph works on a typical graph data database Graph Database principle.
The Data needs to have a Source(From) Node IDs, Target(To) Node Ids and Value, that defines the node size and value for the vertices(nodes).
The Source(From) node column, can only have 1 node id.
The Target(To) node column, can have single or multiple node IDs, separated by a comma. If multiple nodes method is used, then it will not be possible to customize all of them individually afterwards, so this methos is only recommended, if you want to create a network structure without the additional formatting.
There are few additional properties, that you can define through the fields pane, which means you can controll this on data level not just through formatting options. The additional fields are divided into 4 groups:
More information about all the fields can be found under "Setting up fields " section of the Graph visual documentation
Graph Visual also support multiple layout forms:
The Drill Down Graph visual is also the first graph structure visual, that supports bi-directional links. Here is an example of how the data should look like and a visual example:
Additional tools inside chart (lower left corner):
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