If you can draw that shape in svg then you can attach an anchor to the shape and attach events and (hover effects) to it.
There was a recent thread here and look at #post 4 by @SamA74 which shows an svg circle.
I just forked his codepen and added an event listener on click to the red circle only. Just click the red circle. The white edges do not respond.
Of course that assumes you are able to draw your images in svg which might be difficult if they are not as straight forward as you have shown above.