Is it possible, and how do you cross that background?
How do you cross a flashlight so that it can be accurately displayed on all the screen permits? The climatic elements, in particular the circle, should not be separated. And his cesta boundaries matched the background.
Several sets of graphs can be made under different authorizations, and the most appropriate through http://habrahabr.ru/post/119127/ ♪ Let the circle just be part of the background. Fon's up and down. And over the circle/need to place a transparent clinical area.
You can also scrupulously generate this little picture of Besie's curves in svg. And even make some animation of these waves.