circle-image | based library for circular cropping images | Computer Vision library

I need to make a JFrame with a round button and with a round image as the button's Icon(Any thing will but a mask would be easier for me).

So far I have searched for these things but I have found a round JButton but with text(Making a round button by Java Examples) instead of an image. I (for the masking) have seen the Masking but don't know how to implement it to the button please help

PLEASE HELP !!!

I am using bootstrap cards to make a section of my website.I am facing issue in circle image of the cards.I want my images do not get stretch when i put them in image circle of card.Is there a way i can zoom in middle of the image while showing it in circle or am i doing something wrong in my scss code ??

Here is the issue:

Expected Output:

Dimensions of these Images:

910x592 , 1230x802 , 1230x794

Bootstrap Code:

I have an unordered list displayed as a table. Each list element contains an image and a name/title. The image is cropped to a circle. On hover, I would like the circular crop to become a circular border around the image, such that we see the full image with a circle around the face. My inspiration is from this site:

I have successfully cropped the image to a circle, but I am having trouble with the border on hover. You can view my JSFiddle here

I am trying to recreate this team/leadership page:

I have put a box shadow around my ul element, as the example above does. I can't get the margins around the li elements the same way - I set the right margins to be 5 px, but it still bordered with white. How do I get the margins (or space between li elements) to just be filled with the background color of the div (or the ul in this case)?

JSFiddle here: http://jsfiddle.net/mzechar/gyo6t25e/10/

HTML:

I downloaded the exercise files for a tutorial on responsive animated websites and in my code editor (Brackets) at the end of the page the body and html tags are showing in red as if there is an error and I have no idea why. Can anyone tell me?

Also, what's the best way to find out myself? I clicked on "Debug" in the Brackets toolbar but it just gave me the lines where the errors were - 167 and 168 on the page, nothing more. Not much help. Thank you.

I have followed James Montemagno's guide on how to make a custom renderer for round images in my Xamarin Forms Shared Project.

https://blog.xamarin.com/elegant-circle-images-in-xamarin-forms/

(being a true copy of the guide it feels redundant to actually add the code itself to my project but please comment if that is not the case)

It is working flawless, however, I need to change the colour of the circle border dynamically with the press of a button when the app is running.

But since the colour of the circle is set natively in each renderer I am uncertain how I could possibly change it from my shared code.