nonono.

what i mean is to add the wave like diffraction patterns that is formed after hitting the single slit separation as visualize in http://www.ngsir.netfirms.com/applets/diffraction/3X/Diffraction.htm into your very own Ejs applet above?

i have not found any Ejs applet that can do the same thing as http://www.ngsir.netfirms.com/applets/diffraction/3X/Diffraction.htm.
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 http://en.wikipedia.org/wiki/Diffraction
[img]http://upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Wave_Diffraction_4Lambda_Slit.png/220px-Wave_Diffraction_4Lambda_Slit.png[/img]
is perhaps clearer of my request of a new simulation  :D

the physics syllabus is like "explain the meaning of the term diffraction."
from http://en.wikipedia.org/wiki/Diffraction
the diffraction phenomenon is described as the apparent bending of waves around small obstacles and the spreading out of waves past small openings