Slime Mould java simulation

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My java applets were developed a long time ago and have not been digitally signed. Nowadays a browser will typically not allow a java applet to run unless it is signed. Getting the applets signed is somewhat expensive, and since I no longer do any java development it is unlikely that I will get the applets signed. It it still possible to run the applets, but in that case you will need to change the security policy of your browser to allow unsigned applets to run.
Java port of an old C-program I once made.
Slime moulds are a type of primitive organisms with some really interesting behaviors. For example, if there in a good supply of food, the Dictyostelids will live as individual amoebae, but if food is in short supply they will join together to form multi-cellular assemblies. When there is little food the amoebae will produce and release a chemical. They will also move toward higher concentrations of this chemical (Chemotaxis), and in this way the amoebae will be able to find each other and form multi-cellular assemblies.

In the java simulation below the amoebae release a signal chemical as they move. The concentration of the chemical is displayed in color from black (lowest concentration) through red and yellow to white (highest concentration). The chemical will diffuse and also decay at an adjustable rate. The amoebae will tend to turn toward the the highest concentration of the chemical. This will allow the amoebae to form various structures with shapes that depend on the decay rate and density of amoebae.