Customize the position of nodes and their descendants in a d3 tree chart by setting specific x and y coordinates

Question

Customize the position of nodes and their descendants in a d3 tree chart by setting specific x and y coordinates

I am in need of a d3 tree structure that looks like this.

https://i.sstatic.net/X6U3u.png

There are two key points to understand from the image above:

Headers will have multiple parents(wells).
I need to be able to drag and drop links connecting wells to headers and other headers.

To achieve this, I have added both wells and headers as children of fields. I have also given extra depth to header nodes so they appear on different lines than wells. To accommodate multiple parents for headers, I utilize a method to create links by specifying the source and target nodes. You can view an example here: https://i.sstatic.net/1BIOo.png

You'll notice that the depth has been set for RK Battery, but since it is a child of RK Field, its x and y positions are based on the position of wells under RK Field. I want to assign custom positions for batteries and have their children positioned relative to them. Is this achievable?

javascript typescript d3.js hierarchy

Answer 1

Answer №1

Absolutely, it is possible by simply assigning the values accordingly. To better understand a d3.tree visualization, you can divide it into two main parts:

Layout
Rendering

The layout part involves the core functionality provided by d3.tree, which calculates the layout of nodes and assigns positions for each node along the x and y axes. You can refer to the documentation for more details on this process.

In the rendering phase, all the nodes that have been laid out are displayed on the screen using their respective positions. Prior to this step, you have the flexibility to manually adjust the position of any node:

// Perform the layout
d3.tree(rootNode);

// Example of moving a node
rootNode.children[0].x += 10;
rootNode.children[0].y += 10;

It's important that your link data follows the structure as shown below. Each link object should specify the source and target nodes, allowing you to move either the source or target node while ensuring that the link renders correctly at the new location.

const links = [
    { source: {...}, target: {...} },
];

Answer 2

Absolutely, it is possible by simply assigning the values accordingly. To better understand a d3.tree visualization, you can divide it into two main parts:

Layout
Rendering

The layout part involves the core functionality provided by d3.tree, which calculates the layout of nodes and assigns positions for each node along the x and y axes. You can refer to the documentation for more details on this process.

In the rendering phase, all the nodes that have been laid out are displayed on the screen using their respective positions. Prior to this step, you have the flexibility to manually adjust the position of any node:

// Perform the layout
d3.tree(rootNode);

// Example of moving a node
rootNode.children[0].x += 10;
rootNode.children[0].y += 10;

It's important that your link data follows the structure as shown below. Each link object should specify the source and target nodes, allowing you to move either the source or target node while ensuring that the link renders correctly at the new location.

const links = [
    { source: {...}, target: {...} },
];

Customize the position of nodes and their descendants in a d3 tree chart by setting specific x and y coordinates

Answer №1

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