How to automatically arrange nodes without overlapping in React Diagram?

How to add multiple nodes dynamically without overlapping between them

You should not push the node to the nodes collection at runtime. (Example: nodes.push(node)). Instead, you can use a add method to add a node at runtime in React Diagram.

Add a single node dynamically

You can add a node at runtime by using the add method. Refer to the following code example.

<!-- create a button -->
<input type="button" id="Add Node" value="Add Node">

document.getElementById('Add Node').onclick = function () {
    let node = { };
// add a node at runtime
   diagramInstance.add(node);
};

The above code example will add a node to the diagram at position 0,0, which means offsetX and offsetY of a node is 0.

Position the node

You need to set node offsetX and offsetY to position the node in the diagram. Refer to the following code example in which the nodes are positioned at 100,100.

<!-- create a button -->
<input type="button" id="Add Node" value="Add Node">

document.getElementById('Add Node').onclick = function () {
let node = { id:”node1”,offsetX:100,offsetY:100};
// add a node at runtime
   diagramInstance.add(node);
};

Nodes overlaps with each other by clicking the button several times

When you click a button several times, the nodes will be added to the position 100,100 at each button click. So, multiple nodes will be in the same position.

How to avoid overlapping of multiple nodes

To avoid overlapping of nodes, change the node position based on the viewPortWidth value.Here is the code example to initialize the offsetX and offsetY value as 100,100.

//Define offset values initially

let offsetX = 100;
let offsetY = 100;

Here is a code example to change the node offset value based on the diagram viewPortWidth.

document.getElementById('Add Node').onclick = function () {
   let node = { height: 100, width: 100 };
   //check node offset lesser than diagram viewportwidth
   if (offsetX < diagramInstance.scrollSettings.viewPortWidth) {
     node.offsetX = offsetX;
     node.offsetY = offsetY;
     //add a node at runtime
     diagramInstance.add(node);
     offsetX = offsetX + 150;
   } else {
     offsetX = 100;
     offsetY = offsetY + 150;
     node.offsetX = offsetX;
     node.offsetY = offsetY;
     diagramInstance.add(node);
   }
 };

Here is a complete code example to add multiple nodes dynamically without overlapping with each other.

<!-- create a button -->
<input type="button" id="Add Node" value="Add Node">

let offsetX = 100;
let offsetY = 100;

document.getElementById('Add Node').onclick = function () {
   let node = { height: 100, width: 100 };
   //check node offset lesser than diagram viewportwidth
   if (offsetX < diagramInstance.scrollSettings.viewPortWidth) {
     node.offsetX = offsetX;
     node.offsetY = offsetY;
     //add a node at runtime
     diagramInstance.add(node);
     offsetX = offsetX + 150;
   } else {
     offsetX = 100;
     offsetY = offsetY + 150;
     node.offsetX = offsetX;
     node.offsetY = offsetY;
     diagramInstance.add(node);
   }
 };

Sample

Conclusion
I hope you enjoyed learning about how to automatically arrange nodes without overlapping in React Diagram.

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