How to make a polygon object react to rotation events using FabricJS?

We can create a Polygon object by creating an instance offabric.Polygon. A polygon object can be characterized as any closed shape consisting of a set of connected straight line segments. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties such as angle, opacity, etc. We use therotatingevent to demonstrate how to make a polygonal object react to rotation through controls.

grammar

polygon.on(“rotating”, callbackFunction);

Example 1: Show how an object responds to rotation events

Let's look at a code example of how to make a polygon object react torotationevents. In this case, whenever we click on the polygon object and rotate it via the middle rotation control, we will see the recorded output. This is because the rotation event fires continuously as the object rotates.

     
  
Displaying how the object reacts to the rotating event
 
You can rotate the object to see the callback function fired
    

Example 2: Changing fill color when rotation occurs

Let's look at a code example to see how to change the fill color when arotateevent occurs. We can use the middle rotation (mtr) control to rotate objects on the canvas. Here, when we rotate the polygon object using the mtr control, the fill color changes to "green".

     
  
Changing the fill colour when rotate happens
 
 You can see that the fill colour changes when the polygon is rotated 
    

in conclusion

In this tutorial, we use two simple examples to demonstrate how to make a polygon object react to rotation events using FabricJS.

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