The programs written for simulating the movies for various cases are given below.
For each case, the program creates a series of images, which are stitched together using the following command in a Linux terminal:
mencoder mf://*.png -mf w=640:h=480:fps=25:type=png -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:trell -oac copy -o output.avi
Note: These movies are not made for the values finally used for the experiment, they are just for demonstrating the changes in curvature of the diffraction pattern with one of the angles.
You can also find these movies on this YouTube channel.