what i mean is to add the wave like diffraction patterns that is formed after hitting the single slit separation as visualize in into your very own Ejs applet above?

i have not found any Ejs applet that can do the same thing as
chance to create one Ejs simulation on single slit diffraction patterns to benefit even more physics learners and teachers?  ;D
i think this picture from
is perhaps clearer of my request of a new simulation  :D

the physics syllabus is like "explain the meaning of the term diffraction."
the diffraction phenomenon is described as the apparent bending of waves around small obstacles and the spreading out of waves past small openings