Simulator can build demographic models and simulate samples like playing Lego. In evolutionary analysis, it is essential to generate samples under a variety of demographic models. However, it is always difficult for users to implement such models. Thus a highly interactive tool called "simulator" is implemented. By using a drag-and-drop function, varying demographic models can be obtained as easy as building blocks. Samples, including ancestral ones, can then be generated by coalescent-based simulation.
