DF-1 is a Dynamic Fitness Landscape Test Function Generator by Ron Morrison, June 1999. MATLAB (Version 4.2) code is provided for visualizing dynamic fitness landscape test functions generated with the DF1 test function generator. The code will make a MATLAB movie of the dynamic function you design, or it can be paused at each iteration to study the landscape. A User's Manual is also provided which explains the use of the test function generator. Further information about this Test Function can be found in "A Test Problem Generator for Non-Stationary Environments" by Ronald Morrison and Kenneth De Jong in the proceeding of the Congress on Evolutionary Computing 1999 (CEC-99).