How can I draw a slider for image comparison?

I'd like to draw a circle for a slider like this (https://www.w3schools.com/howto/howto_js_image_comparison.asp). I can slide and compare the images, however, I can't make a circle like the one they made it so I can hold the mouse inside that circle and adjust the slider.

Here is the code for image comparison.

clc
clear all 
close all 

im_left = im2double(imread('pears.png')); % opening two example images
im_right = im2double(imread('peacock.jpg'));
im_right = imresize(im_right, size(im_left, [1 2])); % making the dimensions equal
f = figure();
ax = axes('Units', 'pixels');
imshow(im_left);
hold(ax);
im_handle = imshow(im_right);
im_handle.AlphaData = zeros(size(im_left, [1 2]));
axes_pos = cumsum(ax.Position([1 3]));
f.WindowButtonMotionFcn = {@cb,  size(im_left,2), im_handle, axes_pos};
function cb(obj, ~, im_width, im_handle, axes_pos)
    x_pos = obj.CurrentPoint(1);
    if x_pos > axes_pos(1) && x_pos < axes_pos(2)
        left_cols = floor(floor(x_pos - axes_pos(1))/diff(axes_pos) * im_width);
        im_handle.AlphaData(:, 1:left_cols) = 0;
        im_handle.AlphaData(:, left_cols+1:end) = 1;
    end
end

Answer 1

[Anirudh Singh]

I understand you want to make slider on two images for comaprision. But nowhere you used Css property which is present in the link( https://www.w3schools.com/howto/howto_js_image_comparison.asp ) you provided. You can do this by using importing mlreportgen.dom.* and then defining yu css properties.

I am attaching the link for how you can define your css properties.

Or

The latest Matlab GUI (created using the App Designer tool or the uifigure function) is based on HTML, JavaScript and CSS - not on Java Swing. You can check here:

https://in.mathworks.com/help/matlab/app-designer.html