K φ° Xo Yo γ delay slit fps
Wave packet diffraction on a slit (drag mouse to rotate membrane).
0 ≤ slit ≤ 125,     0.7 < Xo,Yo < 2.5,     0 < x,y < π.
You see dynamics of the travelling wave packet
    u(r) = exp(-(r - Ro)2/a2) cos kr,     kx = k cos φ, ky =   k sin φ
moving in the k direction.
WebGL Demos     updated 28 Feb 2011