It generatoes and displays metaballs in 2D.
Each line in textarea is one metasphere, with following parameters delimited by space: x position, y position, radius, and influence
The last parameter is useful mainly for making negative metaballs. Set to 1 for positive or -1 for negative.
Also, all parameter will be converted to integers.
The generator isn't perfect, but it should work for most of the possible inputs.
And here it is.