How to Animate Connectors Using AnnotationTemplate in Angular Diagram?

In this article, we’ll learn how to animate connectors in the Angular Diagram component using the annotationTemplate. By default, connectors in the diagram do not support direct animation through built-in properties. However, we can achieve a visual animation effect by dynamically updating the position of annotations rendered through a template.

To simulate the animation, we add one or more annotations to each connector. Each annotation uses an annotationTemplate to visually represent an animation element. At regular intervals, we update the offset value of each annotation to make it move along the path of the connector. As a result, it appears as if the connector is animated.

Refer to the following code example that shows how to update the annotation position periodically:

public startWorkflow(args: number) {
 this.connectorCollection = [];
     var level = args ? args : 1;
     var connectors = this.diagram.connectors;
     for (var i = 0; i < connectors.length; i++) {
       if (connectors[i].addInfo && (connectors[i].addInfo as any).level === level) {
         this.connectorCollection.push(connectors[i]);
       }
     }
     var intervalDuration = 120;
     this.flowInterval = setInterval(() => {
       for (var j = 0; j < this.connectorCollection.length; j++) {
         var connector = this.connectorCollection[j];
         for (var k = 0; k < connector.annotations.length; k++) {
           if (connector.annotations[k].offset < 0.99) {
             connector.annotations[k].offset += 0.025;
             connector.style.strokeColor = '#F8FC02';
           }
           if (connector.annotations[k].offset >= 0.95) {
             connector.annotations[k].offset = 0;
           }
         }
       }
       this.diagram.dataBind();
     }, intervalDuration);
} 

Call this startWorkflow function once the diagram has been rendered. This setup will continuously update the annotation position and visually simulate an animation along the connector path.

Kindly refer to the working sample below for a complete implementation:
Sample

Conclusion

I hope you enjoyed learning on how to animate connectors using annotationTemplate in Angular Diagram.
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